JP2001165975A - Apparatus and method for measuring antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that an antenna to be measured has to be slid in the Z-axis direction, in a plane scanning near-field measuring apparatus to be measured at different positions and that there is a possibility of generating installation alignment errors, when the antenna to be measured is slid. SOLUTION: The apparatus and method for measuring are provided with an antenna to be measured, a plurality of probes which are installed at positions facing the antenna to be measured and in which the size and/or the shape of an opening part are different, and a computing and processing means, by which the amplitude distribution of the antenna to be measured, is found on the basis of respective electromagnetic waves to be received by the plurality of probes, by which the phase distribution of the antenna to be measured is calculated on the basis of the amplitude distribution and by which the radiation characteristic of the antenna to be measured is found, on the basis of the amplitude distribution and the phase distribution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna measuring device and an antenna measuring method for measuring the radiation characteristics of an antenna having a resonance frequency in a high frequency band, and particularly to a device for accurately positioning an antenna or a probe to be measured. The present invention relates to an antenna measuring apparatus and an antenna measuring method capable of obtaining a radiation characteristic of a measured antenna from a measurement of only an amplitude distribution.

[0002]

2. Description of the Related Art Methods for measuring the radiation characteristics and the like of an antenna are roughly classified into a far-field measurement method and a near-field measurement method as a measurement from a short distance. To explain these in brief, the far-field measurement method measures the transmitted power between a counter antenna located far enough while rotating the antenna to be measured, and obtains the relationship between the rotation angle and the transmitted power at this time. It measures the radiation characteristics such as the directivity of the antenna to be measured. The distance between the antennas required for this measurement is usually set according to the following equation so that the phase difference between the opening end and the center of the antenna is π / 8 or less. R ≧ 2 (D ₁ + D ₂ ) ² / λ R is the distance between the antennas, and D ₁ and D ₂ are the maximum aperture dimensions of the transmitting and receiving antennas.

However, when the radiation characteristics of an antenna having a resonance frequency at a high frequency such as a submillimeter wave are to be measured in the far-field measurement, since the wavelength used is short, the antenna-to-antenna required for measurement can be obtained from the above equation. If the distance R is
It becomes very large. For this reason, there is a problem that a sufficient dynamic range cannot be secured.

On the other hand, the near-field measurement method measures the amplitude and phase of an electromagnetic field in a radiation near-field region of an antenna, and performs an operation based on strict electromagnetic field theory to obtain the radiation characteristics of the antenna. And does not require a large inter-antenna distance compared to the far-field measurement. Specifically, the distance between the antenna to be measured and the probe is short, so that the measurement is performed in an anechoic chamber to eliminate the effects of electromagnetic waves reflected from the surroundings, and the amplitude of the electric field (or magnetic field) near the aperture of the antenna to be measured is measured. The aperture distribution is obtained by measuring the distribution and the phase distribution, and a calculation based on strict electromagnetic field theory is performed on the aperture distribution to obtain the radiation characteristics of the antenna.

However, in the near-field measurement, it is necessary to determine the positions of the antenna to be measured and the probe with high accuracy in order to measure the phase distribution of the antenna to be measured. Furthermore, if the antenna to be measured has a resonance frequency in a high frequency band such as a submillimeter wave, it is very sensitive to this positional accuracy, and there are errors in the measuring instrument, changes in the temperature of the cable, and the installation of the antenna and probe to be measured. It was very difficult to measure the phase distribution due to alignment errors and the like.

As a means for solving the problem in the near-field measurement, there is a phase retrieval method. In this method, the antenna to be measured is alternately placed at two different measurement points, the amplitude distribution of the antenna to be measured at the two different measurement points is measured, and the phase distribution is estimated from the amplitude distribution. The amplitude distribution of the antenna to be measured is obtained from the measurement of the transmitted power of the electromagnetic wave transmitted from the antenna to be measured by the probe, and it is necessary to determine the position of the antenna to be measured and the probe with higher precision compared to the phase distribution measurement. Absent.

FIG. 6 shows, for example, OMBucci et.al.
eld Pattern Determination from Near-Field Amplitud
e on Two Surfaces ”, IEEE Trans.on Antennas and pro
FIG. 7 is a diagram showing a schematic configuration of an antenna measuring apparatus using a conventional phase retrieval method shown in pagation Vol. 38, No. 11, Nov. 1990. In the figure, reference numeral 100 denotes an antenna to be measured, 102 denotes a probe for detecting an electromagnetic wave transmitted from the antenna to be measured 100, 103 denotes a probe 10
2 is an XY scanner that slides 2 in the X-axis direction and the Y-axis direction. 104a is a receiver for obtaining the amplitude distribution and the like of the antenna under measurement 100 from the electromagnetic wave detected by the probe 102;
Reference numeral 05 denotes an arithmetic processor for calculating the radiation characteristics of the antenna under measurement 100 from the amplitude distribution or the like obtained by the receiver 104a according to the phase retrieval method, and reference numeral 106 denotes the antenna 1 under measurement.
The turntable of 00, 107 is the antenna 10 to be measured
A Z-axis rail that slides 0 to freely move back and forth is a transmitter of the antenna under test 100. FIG. 7 is a flowchart showing a process of calculating the phase distribution of the antenna under measurement 100 by the phase retrieval method.

Next, the operation will be described. By sliding the XY scanner 103 or moving the antenna under test 100 on the Z-axis rail 107,
An arbitrary position of 0 (z = R1) is defined as a measurement surface. After that, the antenna to be measured 100 emits an electromagnetic wave toward the probe 102 by the transmitter 112. The electromagnetic wave radiated from the measured antenna 100 is converted into an XY scanner 103.
The detection is performed by the probe 102 positioned in the step. Receiver 10
4a obtains the amplitude distribution at z = R1 from the electromagnetic wave detected by the probe 102. Next, the XY scanner 103 is further slid or the antenna under test 100 is moved to Z
The antenna under test 100 is moved on the
The position (z = R2) other than the above is defined as a measurement surface. Thereafter, the amplitude distribution at z = R2 is obtained in the same manner as described above.

Next, using the amplitude distribution (z = R1, R2) of the measured antenna 100 obtained as described above, the arithmetic processor 105 performs a process by the phase retrieval method shown in FIG. The phase distribution of the measurement antenna 100 is calculated. In the xyz coordinate system shown in FIG. 6, the direction in which the electromagnetic wave is radiated onto the opening of the antenna under measurement 100 is defined as the z-axis, and the center of the opening is defined as the origin. First, z = R1
In step ST100, appropriate values are set as initial values of the amplitude distribution and the phase distribution of the antenna under measurement 100 in step ST100.

Next, the measurement point to be processed is field-converted from z = R1 to z = R2, and the above-mentioned step ST100 is performed.
The amplitude distribution at z = R1 set at
2, the phase distribution at z = R2 is calculated from this and the initial value of the phase distribution (step ST101, step ST102).

In step ST102, z = R2
Is replaced with the amplitude distribution measured at z = R2 (step ST10).
3, step ST104).

Next, the measurement surface to be processed is field-transformed from z = R2 to z = R1, and the amplitude distribution at z = R2 obtained in step ST103 is changed to the amplitude distribution at z = R1. Z = R found
2, the phase distribution of the antenna under measurement 100 at z = R1 is calculated (step ST10).
4, step ST106).

In step ST106, z = R1
Is replaced with the amplitude distribution measured at z = R1 (step ST10).
7, step ST108).

Next, the measurement surface to be processed again is represented by z = R
Field conversion from 1 to z = R2,
The amplitude distribution at z = R1 at 108 is defined as the amplitude distribution at the measurement point R2, and the phase distribution at z = R2 of the antenna under test 100 is calculated from the amplitude distribution at z = R1 calculated at step ST106 ( Step ST109).

In step ST110, step S
The amplitude distribution at z = R2 obtained at T109 is compared with the amplitude distribution at z = R2 actually measured and obtained. If the difference is sufficiently small and converges, the process is terminated. Otherwise, the process returns to step ST102 to repeat the above steps. As described above, the phase distribution estimated from the amplitude distribution of the antenna under test 100 at z = R1 and R2 when the difference from the actually measured value converges to the minimum is the solution in this phase retrieval method.

When the amplitude distribution and the phase distribution of the electric field of the antenna under measurement 100 on an arbitrary measurement surface are obtained, it is possible to perform a calculation based on the electromagnetic field theory to perform field conversion to another arbitrary position. It is possible. As a result, the measured antenna 1 estimated as described above is obtained.
Using the phase distribution and the amplitude distribution of 00, various characteristics such as the aperture distribution and the radiation pattern of the antenna under measurement 100 can be calculated.

In the above description, the probe 102 is scanned in the X-axis direction or the Y-axis direction to measure the antenna under test 100. However, for example, the probe 102 is slidable in the X-axis direction, The measurement antenna 100 may be installed on a turntable that is rotatable about an axis parallel to the x-axis to scan a cylinder. Further, the antenna to be measured 100 may be installed on a turntable that is rotatable about the x-axis and the y-axis to perform spherical scanning.

On the other hand, in the near-field measurement, the probe has a sufficiently small aperture diameter and uses a receiving antenna that is as omnidirectional as possible, but actually has some directivity.
In this case, the radiation characteristics of the antenna to be measured are obtained by performing correction in consideration of the directivity of the probe. FIG.
Pepjar et.al. “Accurate Determination of PlanarNea
r-Field Correction Parameters for Linearly Polariz
ed Probes ”, IEEE Trans.on Antennas and propagation
FIG. 6 is an explanatory diagram for explaining near-field measurement for correcting directivity of a conventional probe shown in Vol. 36, No. 6, Nov. 1988. The same components as those in FIG. 6 are denoted by the same reference numerals, and redundant description will be omitted. The antenna device in FIG. 8 uses the same phase retrieval method as in FIG.
A radiation characteristic of 00 is obtained, and the directivity of the probe is corrected based on the radiation characteristic.

Next, correction of the directivity of the probe will be described. As shown in FIG. 8, the probe 102 has a directional characteristic, and the reception level of the electromagnetic wave of the antenna under measurement 100 measured using the probe 102 includes an error due to the directional characteristic. This error is corrected using the reception level of the probe 102 including an error due to the directivity characteristic and the known Fourier spectrum of the probe 102.

First, a plane including an opening surface of the probe 102 is defined as a scan plane, and an XY is defined as an origin at an intersection of a straight line passing through the scan plane from the center of the aperture of the antenna under test 100.
Define the coordinate system. The center position of the opening of the probe 102 on the scan plane is set as the measurement point P, and the electromagnetic wave radiated from the antenna 100 to be measured is detected in the same manner as described above. Here, the reception level b ′ at the measurement point P
( P ) is represented by the following equation.

(Equation 1) Here, A ₁ is the input coefficient of the antenna, K is a wave vector in the XY plane, t ( K ) is the Fourier spectrum of the antenna under test 100, and r ′ ( K ) is the existing Fourier spectrum of the probe 102. The gamma is the amount that when the wave vector, including the Z-axis direction and _{k = k x e x + k} y e y + k z e z, is expressed by γ ² = k ² -K ^2. d indicates the distance between the antenna under measurement 100 and the probe 102. P represents a vector of the measurement point P.

As can be seen from the above equation (1), the probe 1
The received level b ′ ( P ) received using 02 includes the characteristics of the Fourier spectrum r ′ ( K ) of the probe 102 itself, and this becomes an error of the probe 102. Therefore, a process of removing the Fourier spectrum r '( K ) of the probe 102 itself will be described.

First, Equation (1) is inversely transformed by Fourier transform.
The Fourier spectrum D ′ ( K ) of the measured value including an error due to the directivity of the probe 102 can be obtained as in the following equation.

(Equation 2) Here, t (K) and r '(K) so are divided into cross-polarized component as a main polarized wave components as _{follows, t (K) = t m} (K) e m + t c (K) _{e c r '(K) =} r' m (K) e m + r 'c (K) e c ··· (3) and can be expressed. Here, the subscript m represents the main polarization component, and c represents the cross polarization component. In the above measurement, the measured antenna 10
When the cross-polarization component of 0 and the probe 102 is sufficiently low, t _m ( K ) = D ′ ( K ) / r ′ _m ( K ) (4) where t _m ( K ) is 6 is a Fourier spectrum of the measured antenna 100 in which the directivity of the probe 102 has been corrected. Note that the spectrum of the probe 102 can be corrected in any of the measured value and the calculated value.

[0023]

Since the conventional antenna measuring apparatus and the conventional antenna measuring method are configured as described above, for example, in a planar scanning near-field measuring apparatus, the antenna to be measured is slid in the z-axis direction to be different. There is a problem that the measurement must be performed on the measurement surface of the position, and there is a possibility that an error in the installation alignment may occur during sliding.

In addition, since the antenna measurement device must be slidable in the z-axis, a large-scale device such as a Z-axis rail capable of positioning with high precision is required, and the production of the device is costly. was there.

Further, in the case of the cylindrical scanning near-field measuring device and the spherical scanning near-field measuring device, it is necessary to move the probe in the radial direction from the center axis and the center point of scanning, respectively. However, there is a problem that a moving device capable of positioning with high accuracy is required, and the cost of manufacturing the device is higher.

The present invention has been made to solve the above-described problems, and is an antenna measuring apparatus which can be simply configured and can measure an antenna having a resonance frequency in a high frequency band such as a submillimeter wave. And an antenna measurement method.

[0027]

An antenna measuring apparatus according to the present invention has a size of an antenna to be measured and an opening provided at a position facing the antenna to be measured and receiving an electromagnetic wave radiated from the antenna to be measured. A plurality of probes having different heights and / or shapes and an amplitude distribution are obtained from the electromagnetic waves received by the plurality of probes, a phase distribution of the antenna under test is calculated from the amplitude distribution, and a phase distribution of the antenna under test is calculated from the amplitude distribution and the phase distribution. Arithmetic processing means for obtaining radiation characteristics.

An antenna measuring apparatus according to the present invention is provided at an antenna to be measured and at a position facing the antenna to be measured, receives an electromagnetic wave radiated from the antenna to be measured, and receives the electromagnetic wave in a direction parallel to the antenna to be measured. And a probe having an opening having a different length in the vertical direction, and a probe rotating means for rotatably holding the probe and alternately switching a horizontal direction and a vertical direction with respect to the antenna to be measured of the probe, A probe for calculating an amplitude distribution from electromagnetic waves received in each direction, calculating a phase distribution of the measured antenna from the amplitude distribution, and calculating a radiation characteristic of the measured antenna from the amplitude distribution and the phase distribution. is there.

An antenna measuring apparatus according to the present invention includes a sliding means for holding a probe slidably in a horizontal and / or vertical direction with respect to an antenna to be measured.

The antenna measuring apparatus according to the present invention includes a rotating means for holding the antenna to be measured so as to be rotatable about an axis in a direction horizontal and / or perpendicular to the probe.

According to the antenna measuring method of the present invention, an initial value setting step of setting an initial value of a phase distribution of an antenna to be measured in advance, and a plurality of probes having different sizes and / or shapes of apertures are provided. Collectively receive the electromagnetic waves radiated from the, the amplitude distribution measuring step to obtain the amplitude distribution from the electromagnetic waves received by the plurality of probes, and calculate the calculation data from the amplitude distribution and the phase distribution,
A calculation data correction value is obtained by removing an element resulting from the directivity of the plurality of probes from the calculation data,
The amplitude distribution and the phase distribution on the measurement surface of the antenna to be measured are calculated based on the calculation data correction value, and the amplitude distribution is sequentially replaced with each amplitude distribution obtained from the electromagnetic waves received by the plurality of probes. And comparing the correction data correction values for the respective calculation data correction values of the plurality of probes obtained in the correction conversion step with each other, and when they substantially match, based on the calculation data correction values. And a comparison operation step of repeating the correction conversion step when the amplitude distribution and the phase distribution of the antenna to be measured are found to be substantially inconsistent.

In the antenna measuring method according to the present invention, an initial value setting step for presetting an initial value of a phase distribution of the antenna to be measured and an aperture having different lengths in the horizontal and vertical directions with respect to the antenna to be measured. A probe having a portion,
An amplitude distribution measuring step of receiving an electromagnetic wave radiated from the measured antenna in a horizontal direction and a vertical direction with respect to the measured antenna and obtaining an amplitude distribution from the electromagnetic waves received by the probe in each direction; The calculation data is calculated from the distribution, the element due to the directivity of the probe in each direction is removed from the calculation data to obtain a calculation data correction value, and the antenna to be measured is determined based on the calculation data correction value. Computes the amplitude distribution and phase distribution on the measurement plane, and sequentially replaces the amplitude distribution with each amplitude distribution obtained from the electromagnetic waves received by the probe in each direction to obtain a correction data for calculating the calculation data of the probe in each direction. Step and the correction data correction values of the probe in each direction obtained by this correction conversion step are compared. Arabic obtain an amplitude distribution and phase distribution of the measured antenna on the basis of the data correction value, when not substantially match, in which and a comparison calculation step of repeating the correction conversion step.

In the antenna measuring method according to the present invention, the initial value of the phase distribution of the antenna under test set in the initial value setting step uses a calculated value calculated based on the shape of the antenna under test.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a diagram schematically showing an antenna measuring apparatus according to Embodiment 1 of the present invention. In the figure, reference numeral 1 denotes an antenna to be measured, 2a denotes a first probe (probe), and 2b denotes a second probe having a larger opening diameter than the first probe 2a.
In a probe (probe), the first probe 2a and the second probe 2b are arranged in parallel along the x-axis. Three
Is an xy scanner (sliding means) for sliding the first probe 2a and the second probe 2b in the x-axis direction and the y-axis direction. Reference numeral 4a denotes a transceiver capable of receiving two channels of the electromagnetic wave of the antenna under test 1 detected by the first probe 2a and the second probe 2b. Reference numeral 5 denotes an arithmetic processor (arithmetic processing means) for arithmetically processing data relating to the antenna under test 1 inputted from the transceiver 4a. 12 is the antenna under test 1
And a transmitter for transmitting electromagnetic waves. FIG. 2 is a flowchart showing a phase estimation algorithm of the antenna measuring method using the antenna measuring device according to the first embodiment of the present invention.

Next, the operation will be described. Although not shown, a plane including the respective aperture surfaces of the probes 2a and 2b is defined as a scan plane, and an xyz coordinate system is defined as having an origin at an intersection of a straight line passing through the scan plane from the center of the aperture of the antenna 1 to be measured. When the xy scanner 3 is slid along the x-axis direction and the electromagnetic waves radiated from the antenna 1 to be measured are simultaneously received by the probes 2a and 2b, the probe 2a moves to the center position P _{n of the} opening (measurement point P _n ), the probe 2b receives the signal at the measurement point P _n-1 (P _n and Pn-1 are already arranged in the x-axis direction at the measurement point P _n-1.
(Where the coordinate value is P _n-1 <P _n ). Next, the xy scanner 3 is slid along the x-axis direction so that the center position of the opening of the probe 2 b is already set to the probe 2.
When a reaches the measured point _Pn , a signal is received, and the probe 2a receives a signal at the next measurement point. The electromagnetic wave from the antenna 1 to be measured is received through such steps. Thereby, the finally obtained probes 2a, 2b
Will have data at the same measurement points at the same intervals.

Using the amplitude distributions obtained from the two probes 2a and 2b measured as described above, the antenna 1 to be measured is processed by the arithmetic processor 5 according to the algorithm described below in accordance with the flow shown in FIG. The phase distribution on the aperture of is obtained. First, in a memory (not shown) in the arithmetic processing unit 5, a uniform phase distribution P0 at a certain measurement point P (at this time, the measurement surface of the antenna 1 to be measured is z = Z1).
( P ) is set as an initial value (initial value setting step). Next, for example, the amplitude distribution A1 ( P ) of the antenna under measurement 1 is obtained from the electromagnetic wave detected by the first probe 2a (amplitude distribution measuring step). The operation so far corresponds to step ST1 in FIG.

Next, in step ST2, a spectrum representing the radiation characteristic of the antenna under test 1 is calculated based on the amplitude distribution A1 ( P ) and the phase distribution P0 ( P ) (where P is the vector of the measurement point P). Represent). Here, since it is a plane scan, the amplitude distribution A1 ( P ) and the phase distribution P
Fourier transform (FFT in the figure) can be performed on 0 ( P ). Thus, the spectrum D1 ( K ) (calculation data) representing the radiation characteristic of the antenna under measurement 1 is
It is obtained as in the following equation.

(Equation 3) Here, A ₁ is the input coefficient of the antenna of the first probe 2a,
Table K is the wave vector in the XY plane, gamma is when the wave vector, including the Z-axis direction and _{k = k x e x + k} y e y + k z e z, γ 2 = k 2 -K 2 Amount. d
Indicates a distance between the antenna 1 to be measured and the first probe 2a. The operations so far correspond to steps ST2 and ST3 in FIG. 2, and these are the amplitude distribution measuring steps.

The spectrum r1 ( K ) representing the radiation characteristic of the first probe 2a itself is a known value, and is used to perform a correction for removing an element due to the directivity of the first probe 2a. Here, r1 ( K ) is a complex number, and assuming that the cross-polarization component between the antenna under test 1 and the first probe 2a is sufficiently small, a correction for removing an element caused by the directivity of the first probe 2a is performed. The spectrum D1 '( K ) (the data correction value for calculation) representing the radiation characteristic of the antenna under test 1 is expressed by the following equation. D1 ′ ( K ) = D1 ( K ) / r1 ( K ) (6) The operation up to this point is from step ST4 to step S in FIG.
It corresponds to T6.

The antenna 1 to be measured obtained in step ST6
The Fourier transform is again performed on the spectrum D1 ′ ( K ) of (1) to calculate the electric field distribution of the measured antenna 1 at the measurement plane z = Z1 (step ST7). In the first embodiment, since the probes 2a and 2b perform plane scanning, the amplitude distribution of the electric field distribution is A1 '( P ), and the phase distribution is P1 ( P ).
Then, the electric field distribution can be expressed as the following equation (step ST8).

(Equation 4)

Next, the amplitude distribution A2 ( P ) of the antenna under test 1 obtained from the electromagnetic wave measured by the second probe 2b is read from a memory (not shown) in the arithmetic processing unit 5 (step ST9), and the electric field distribution is obtained. Amplitude distribution A1 'at
( P ) (step ST10). By subjecting the electric field distribution (amplitude distribution and phase distribution) in which the amplitude distribution is replaced to Fourier transform (step ST11) again, a spectrum D2 ( K ) of the data observed by the second probe 2b represented by the following equation is obtained. (Step ST12).

(Equation 5) Here, A ₂ indicates the input coefficient of the antenna of the second probe 2b.

As in the case of the first probe 2a, the second probe 2b also has directivity.
2 ( K ), and using this, a correction is performed to remove the element due to the directivity of the first probe 2a. Where r2
( K ) is a complex number, assuming that the cross-polarization component between the antenna under test 1 and the second probe 2b is sufficiently small,
The spectrum D representing the radiation characteristic of the antenna under test 1 which has been corrected so as to remove elements caused by the directivity of the probe 2b
2 ′ ( K ) (calculation data correction value) is represented by the following equation. D2 '( K ) = D2 ( K ) / r2 ( K ) (9) The operations up to this point correspond to steps ST13 to ST15 in FIG. 2, and steps ST4 to ST1.
Up to 5 is the correction conversion step.

Thereafter, D1 'obtained in step ST6 is obtained.
( K ) is compared with D2 ′ ( K ) obtained in step ST15 (step ST17). This comparison operation is performed, for example, by calculating the difference ε between D1 ′ ( K ) and D2 ′ ( K ) represented by the following equation.
This is performed using ε = | D2 '(K) -D1' (K) | Since the ² (10) specifically for comparing the amplitude distribution of D1 'amplitude distribution and D2 of (K)' (K), these Is subjected to a Fourier transform (FFT in the drawing) to obtain an amplitude distribution and a phase distribution (step ST16). Two spectra D1 '( K ), D
Since 2 ′ ( K ) is the spectrum of the antenna under test 1 obtained from the amplitude distribution having data at the same measurement points at the same interval, ε, which is the difference between them, should be zero, Initially, D1 ′ ( K ) and D2 ′ ( K ) are not equal due to factors (such as the directivity of the probes 2a and 2b) derived from the difference in the shape of the probes 2a and 2b.
Therefore, if ε does not show a sufficiently small value and these differences are large, the process proceeds to step ST19, and the operation from step ST2 is repeated to remove factors derived from the difference in the shapes of the probes 2a and 2b. The specific operation will be described later. Further, it is determined that ε has converged to a sufficiently small value, and the process proceeds to step ST18, where D1 ′ ( K ) (= D2 ′)
( K )) is subjected to Fourier transform to obtain an amplitude distribution and a phase distribution at an arbitrary position of the antenna 1 to be measured.

Step S to proceed when ε does not converge
In T19, the electric field distribution (amplitude distribution and phase distribution) on the measurement surface (z = Z1) of the antenna under measurement 1 is obtained using D2 ′ ( K ) obtained in step ST15. At this time, assuming that the amplitude distribution is A2 ′ ( P ) and the phase distribution is P2 ( P ), the electric field distribution is expressed by the following equation in the case of planar scanning.

(Equation 6)

Next, the amplitude distribution A1 ( P ) of the antenna under test 1 obtained from the electromagnetic wave measured by the first probe 2a is read from a memory (not shown) in the processor 5 (step ST20), and the electric field distribution is obtained. Amplitude distribution A2 'at
( P ) (step ST21). In this way, the amplitude distribution A1 ( P ) and the phase distribution P2 ( P ) on the measurement surface (z = Z1) of the antenna 1 to be measured are obtained, and then the operation from step ST2 is performed again in step ST17.
Is repeated until ε in converges. Step S above
The period from T16 to step ST21 corresponds to a comparison operation step.

When an amplitude / phase distribution on a certain surface is obtained, it is needless to say that the field can be converted to an arbitrary position, for example, an aperture distribution, using the distribution. Needless to say, the phase distribution obtained in each step at the time of convergence is a correctly estimated phase distribution in each state.

As described above, according to the first embodiment, the antenna 1 to be measured and the aperture diameter provided at the position facing the antenna 1 to be measured and receiving the electromagnetic wave radiated from the antenna 1 to be measured The amplitude distribution is obtained from the first probe 2a and the second probe 2b which are different from each other and the electromagnetic waves received by the probes 2a and 2b, the phase distribution of the antenna 1 to be measured is calculated from the amplitude distribution, and the amplitude distribution and the phase distribution are calculated from the phase distribution. Since the radiation characteristics of the measurement antenna 1 are obtained, the phase distribution thereof can be estimated without moving the antenna 1 to be measured, and a large-scale device capable of positioning with higher precision than in the past is not required. Production costs can be reduced. In addition, since the measured antenna 1 does not move with respect to the alignment accuracy, highly accurate measurement is possible even when the measured antenna 1 has a resonance frequency in a high frequency band such as a submillimeter wave. Furthermore, since two measurement values are obtained at the same time, it is not necessary to perform two measurements as in the conventional case, and the measurement time can be reduced.

According to the first embodiment, the initial value setting step for setting the initial value of the phase distribution of the antenna under test 1 in advance and the probes 2a and 2b having different aperture diameters are different from each other.
An electromagnetic wave radiated from the antenna 1 to be measured is collectively received, an amplitude distribution measuring step for obtaining an amplitude distribution from the electromagnetic waves received by the probes 2a and 2b, and the antenna 1 as arithmetic data from the amplitude distribution and the phase distribution. Is calculated, a component due to the directivity of the probes 2a and 2b is removed from the spectrum to obtain a correction spectrum as a data correction value for calculation, and the measured antenna 1 A correction conversion step of calculating an amplitude distribution and a phase distribution on the measurement surface, sequentially replacing the amplitude distribution with each amplitude distribution obtained from the electromagnetic waves received by the probes 2a and 2b, and obtaining respective correction spectra of the probes 2a and 2b; Comparing the corrected spectra of the probes 2a and 2b obtained in the correction conversion step, When they substantially match, the amplitude distribution and phase distribution of the antenna under test 1 are obtained based on the corrected spectrum, and when they do not substantially match, the measurement is performed by a method including a comparison operation step of repeating a correction conversion step. Since the amplitude distribution and the phase distribution of the antenna under test 1 can be obtained in accordance with the phase retrieval method while compensating for errors caused by the directional characteristics of the probes 2a and 2b, the radiation characteristics of the antenna under test 1 can be determined with higher accuracy. Can be measured.

Furthermore, in the first embodiment, since the field scan is a plane scan, the Fourier transform can be used since the field transform is a plane wave expansion, and the calculation can be performed at high speed.

In the first embodiment, the cross polarization component between the antenna 1 to be measured and the probes 2a and 2b is sufficiently small when performing correction for removing an element caused by the directivity of the probes 2a and 2b. Since the calculation is performed on the premise of this, it is desirable that the probes 2a and 2b used should realize low cross polarization, such as a horn having a rectangular opening or a cut end of a waveguide. Although the term "probe" is used for comparison with the conventional example, a horn having an opening having a size of several to several tens of wavelengths as compared with the measurement wavelength may be used as a probe. In the first embodiment, an example in which measurement is performed with the two probes 2a and 2b has been described. However, the present invention is not limited to this, and three or more openings having different shapes and sizes may be used. Good. Thereby, three or more measurement values can be obtained at the same time, so that the measurement time can be further reduced.

Further, in the first embodiment, two probes 2a and 2b having different aperture diameters are used. However, as long as low cross polarization can be realized, probes or apertures having different aperture shapes may be used. Probes having different shapes and sizes may be used.

Embodiment 2 In the first embodiment, an example is shown in which the probes 2a and 2b and the antenna under test 1 are fixed and measurement is performed.
b is plane-scanned on a scan plane, and the antenna 1 to be measured is rotated to obtain amplitude distributions on various measurement planes.

FIG. 3 schematically shows an antenna measuring apparatus according to a second embodiment of the present invention. In the figure, A
Is a rotation axis of the one-axis turntable 6a; 6a is a one-axis turntable (rotation means) for rotating the antenna under test 1 around the A axis;
Is an x-axis direction scanner (sliding means) for sliding the probes 2a and 2b in the x-axis direction. The definition of the xyz coordinate system on the scan plane is the same as that in FIG. Note that the same components as those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

Next, the operation will be described. By rotating the antenna under test 1 around the A-axis and moving the probes 2a and 2b on the x-axis for each rotation angle of the antenna under test 1 and scanning, the radial direction ρ of the antenna 1 under test is obtained. Z
One can measure the amplitude distribution on the cylindrical surface. Using this as the measurement surface of the antenna under measurement 1 in the first embodiment, the phase distribution is calculated in the same manner as in the first embodiment using the respective amplitude distributions obtained by the probes 2a and 2b. In FIG. 2, the conversion for obtaining the spectrum is represented by a cylindrical coordinate system.

FIG. 4 is a diagram schematically showing another example of the antenna measuring apparatus according to the second embodiment of the present invention. In the figure, A denotes XY on a plane including the measurement surface of the antenna 1 to be measured.
In terms of coordinates, the rotation axis is a rotation axis parallel to the X axis of the two-axis turntable 10, and B is a rotation axis parallel to the Y axis of the two-axis turntable 10. Reference numeral 10 denotes a two-axis turntable (rotating means) for rotating the antenna 1 to be measured around the A axis and the B axis. The definition of the xyz coordinate system on the scan plane is the same as that in FIG. Note that the same components as those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

Next, the operation will be described. The antenna 1 to be measured is rotated around the A and B axes, respectively, and the rotation angles of the antenna 1 to be measured are measured by the probes 2a and 2b, so that the rotation center of the biaxial turntable 10 is set as the origin. An amplitude distribution on a spherical surface can be measured. Using this as the measurement surface of the antenna under measurement 1 in the first embodiment, the phase distribution is calculated in the same manner as in the first embodiment using the respective amplitude distributions obtained by the probes 2a and 2b. In FIG. 2, a spherical coordinate system is used for conversion when obtaining a spectrum.

As described above, according to the second embodiment, in addition to the configuration of the first embodiment, the probes 2a and 2b having different aperture diameters are horizontally and / or vertically attached to the antenna 1 to be measured. X-axis direction scanner 9, which is a sliding means for slidably holding in various directions, probes 2a and 2b
Is provided with a one-axis turntable 6a and a two-axis turntable 10 which are rotation means for holding the antenna 1 under test so as to be rotatable about an axis in a horizontal and / or vertical direction. Because the measurement range can be expanded,
For example, cylindrical scanning or spherical scanning that can measure the electric field distribution on the back surface of the antenna 1 to be measured can be performed. In addition, the cost of the measuring device can be reduced without using an expensive and large-scale moving device for the cylindrical scanning near-field measurement and the spherical scanning near-field measurement.

Embodiment 3 In the above-described first and second embodiments, an example is shown in which a plurality of probes having different sizes and / or shapes of apertures are used. However, in the third embodiment, a direction parallel to the antenna to be measured and A probe having openings having different lengths in the vertical direction is used.

FIG. 5 is a view showing an antenna measuring apparatus according to a third embodiment of the present invention. FIG. 5 (a) is a schematic configuration diagram, and FIG. 5 (b) is an enlarged view showing a probe peripheral portion. In the figure, reference numeral 2c denotes a probe having a rectangular opening (probe) having different vertical and horizontal lengths, and the lengths of the sides are a and b, respectively. Reference numeral 4b denotes a transceiver capable of receiving one channel of the electromagnetic wave of the antenna under measurement 1 detected by the probe 2c. Reference numeral 8 denotes a probe polarization rotation device (probe rotation means) for rotating the probe 2c around an axis passing through the center of the opening.
Although not shown, a plane including the opening surface of the probe 2c is set as a scan plane, and an origin xyz is set at an intersection of a straight line passing through the scan plane from the center of the opening of the antenna 1 to be measured.
Define the coordinate system. Probe 2 on scan plane
The center position of each of the openings c is a measurement point P, and the measurement surface of the antenna 1 to be measured is z = Z1. The same components as those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

Next, the operation will be described. In the case where probes having different lengths and widths are used, for example, in the coordinate system shown in FIG. 5A, when the received polarization of the probe is in the x-axis direction, the measurement is performed with the side of the length b being parallel to the x-axis. Measurements and
When the side having the length a is measured in parallel with the x-axis, different measurement results are obtained. Therefore, as shown in FIG. 5 (b), measurement is performed with the side of the length b parallel to the x-axis, and the probe is rotated 90 degrees using the probe polarization rotation device 8, and the side of the length a is set on the x-axis. The phase distribution is estimated in the same manner as in the first embodiment using the two measurement values measured in parallel to the above. The correction of the probe 2c is performed by using a spectrum or the like representing the radiation characteristic of the probe 2c in each of the above directions. As described above, in the third embodiment, the probe having different lengths and widths of the opening is rotated to change the length and width, and the measurement is performed. Thus, the movement of the antenna to be measured is omitted, and the analysis based on the phase retrieval method is further performed. Therefore, the radiation characteristic of the antenna to be measured can be estimated only from the amplitude distribution measurement. Note that the direction of the excitation polarization does not change due to the rotation of the probe 2c.

As described above, according to the third embodiment, the antenna 1 to be measured and the antenna 1 to be measured which are provided at a position facing the antenna 1 to be measured and receive the electromagnetic wave radiated from the antenna 1 to be measured. A probe 2c having openings having different lengths in a horizontal direction and a vertical direction with respect to the antenna 1, and an amplitude distribution is obtained from electromagnetic waves received by the probe 2c in each direction.
Is calculated, and the radiation characteristic of the antenna under test 1 is obtained from the amplitude distribution and the phase distribution. Therefore, it is possible to estimate the phase distribution without moving the antenna under test 1 as in the related art. Since a large-scale device capable of accurate positioning is not required, the manufacturing cost of the device can be reduced. In addition, since the measured antenna 1 does not move with respect to the alignment accuracy, highly accurate measurement is possible even when the measured antenna 1 has a resonance frequency in a high frequency band such as a submillimeter wave.

Further, according to the third embodiment, an initial value setting step for setting an initial value of the phase distribution of the antenna 1 to be measured in advance and the length in the horizontal and vertical directions with respect to the antenna 1 to be measured. Probe 2 having openings of different sizes
c is an amplitude distribution measuring step of receiving an electromagnetic wave radiated from the antenna 1 to be measured in each direction, obtaining an amplitude distribution from each electromagnetic wave received by the probe 2c, and measuring the amplitude distribution and the phase distribution as arithmetic data. A spectrum representing the radiation characteristic of the antenna 1 is calculated, an element due to the directivity of the probe 2c in each direction is removed from the spectrum, a correction spectrum is obtained as a data correction value for calculation, and a measurement target is measured based on the correction spectrum. The amplitude distribution and the phase distribution on the measurement surface of the antenna 1 are calculated, and the amplitude distributions are sequentially replaced with the amplitude distributions obtained from the electromagnetic waves received by the probe 2c in each direction.
c, a correction conversion step for obtaining each correction spectrum, and the probe 2c in each direction obtained by the correction conversion step.
A comparison operation step of repeating the correction conversion step when the measured spectra are substantially the same, the amplitude distribution and the phase distribution of the antenna under test 1 are determined based on the corrected spectra. The probe 2a, 2b
Since the amplitude distribution and the phase distribution of the measured antenna 1 can be obtained according to the phase retrieval method while correcting the error caused by the directional characteristics of the antenna 1, the radiation characteristics of the measured antenna 1 can be measured with higher accuracy. it can.

Further, in the third embodiment, the probe 2c having a rectangular opening having a different length and width is shown as the probe 2c.

In addition to the configuration of the third embodiment,
A sliding means for holding the probe 2c slidably in the horizontal and / or vertical direction with respect to the antenna 1 to be measured, and the sliding means for freely rotating around an axis in the horizontal and / or vertical direction with respect to the probe 2c. By providing the rotating means for holding the measurement antenna 1, it is possible to perform cylindrical scanning or spherical scanning capable of measuring the electric field distribution on the back surface of the antenna 1 to be measured. In addition, the cost of the measuring device can be reduced without using an expensive and large-scale moving device for the cylindrical scanning near-field measurement and the spherical scanning near-field measurement.

In the third embodiment, compared to the first and second embodiments, two measurement values cannot be obtained at the same time, so that the effect of shortening the measurement time cannot be obtained.
Since b is an ordinary one-channel transceiver, measurement can be performed at lower cost than in the first and second embodiments.

It should be noted that the first to third embodiments are described.
In the algorithm of the present invention for estimating the phase distribution of the present invention, the underlying theory is based on the optimal method and depends on the initial value. In Embodiments 1 to 3 described above, the initial value of the phase distribution is a uniform phase distribution at the measurement point P in the estimation algorithm, but instead is calculated based on the shape of the antenna to be measured. Use the calculated value. As a result, it is possible to prevent a local solution from falling, and there is an effect that convergence is accelerated. Further, the initial value of the phase distribution does not greatly deviate from the true value, and the reliability of the estimation algorithm can be improved.

[0066]

As described above, according to the present invention, the size of the antenna to be measured and the size of the opening provided at a position facing the antenna to be measured and receiving the electromagnetic wave radiated from the antenna to be measured are as follows. And / or calculating the amplitude distribution from a plurality of probes having different shapes and the electromagnetic waves received by the plurality of probes, calculating the phase distribution of the antenna to be measured from the amplitude distribution, and radiating characteristics of the antenna to be measured from the amplitude distribution and the phase distribution. Since it is possible to estimate the phase distribution without moving the antenna to be measured, there is no need for a large-scale device capable of positioning with higher precision than before, and therefore, it is necessary to manufacture the device. This has the effect of reducing costs. Further, since the measured antenna does not move with respect to the alignment accuracy, highly accurate measurement is possible even when the measured antenna has a resonance frequency in a high frequency band such as a submillimeter wave. Further, since a plurality of measurement values can be obtained simultaneously with a plurality of probes, it is not necessary to perform a plurality of measurements as in the related art, and there is an effect that the measurement time can be reduced.

According to the present invention, the antenna to be measured and the electromagnetic wave radiated from the antenna to be measured are provided at a position facing the antenna to be measured, and the antenna receives the electromagnetic wave radiated from the antenna to be measured. A probe having openings having different lengths in different directions, a probe rotating means for rotatably holding the probe and alternately switching a horizontal direction and a vertical direction with respect to the antenna to be measured of the probe, and Find the amplitude distribution from the electromagnetic waves received in the direction,
Calculate the phase distribution of the antenna under measurement from this amplitude distribution,
Since it has arithmetic processing means for calculating the radiation characteristics of the antenna to be measured from the amplitude distribution and the phase distribution, the phase distribution can be estimated without moving the antenna to be measured. Since a simple device is not required, there is an effect that the manufacturing cost of the device can be reduced. In addition, even when the antenna to be measured has a resonance frequency in a high frequency band such as a submillimeter wave, the alignment accuracy does not move the antenna to be measured, so that highly accurate measurement is possible.

According to the present invention, since the probe is provided with the sliding means for slidably holding the probe in the horizontal and / or vertical directions with respect to the antenna to be measured, the measurement range of the antenna to be measured can be expanded. For example, cylindrical scanning or spherical scanning that can measure the electric field distribution on the back surface of the antenna to be measured can be performed. Also, paragraph 006
6. By adding to the configuration of paragraph 0067 or paragraph 0069, the cost of the measuring device can be reduced without using an expensive and large-scale moving device for the cylindrical scanning near-field measurement and the spherical scanning near-field measurement. There is.

According to the present invention, since the rotating means for holding the antenna to be measured is provided so as to be rotatable about an axis in a direction horizontal and / or perpendicular to the probe, the measurement range of the antenna to be measured can be expanded. For this reason, for example, cylindrical scanning or spherical scanning capable of measuring the electric field distribution on the back surface of the antenna to be measured can be performed. Also,
By adding to the configuration of paragraphs 0066 to 0068, there is an effect that the cost of the measuring device can be reduced without using an expensive and large-scale moving device for the cylindrical scanning near-field measurement and the spherical scanning near-field measurement. .

According to the present invention, the initial value setting step for setting the initial value of the phase distribution of the antenna to be measured in advance, and a plurality of probes having different aperture sizes and / or shapes are radiated from the antenna to be measured. And a plurality of probes collectively receive electromagnetic waves, calculate an amplitude distribution from the electromagnetic waves received by the plurality of probes, calculate calculation data from the amplitude distribution and the phase distribution, and calculate a plurality of probes from the calculation data. A data correction value for operation is obtained by removing an element due to directivity of the antenna, an amplitude distribution and a phase distribution on the measurement surface of the antenna to be measured are calculated based on the data correction value for operation, and the amplitude distribution is calculated by a plurality of probes. Is sequentially replaced with each amplitude distribution obtained from the received electromagnetic wave, a correction conversion step of obtaining each calculation data correction value of a plurality of probes, Comparing the calculation data correction values of the plurality of probes obtained in the correction conversion step, and when they substantially match, obtain the amplitude distribution and phase distribution of the antenna under measurement based on the calculation data correction values, and A comparison operation step of repeating the correction conversion step when they do not coincide with each other, so that the amplitude distribution and the phase distribution of the antenna to be measured can be obtained according to the phase retrieval method while correcting the error caused by the directivity of the probe. This has the effect that the radiation characteristics of the antenna to be measured can be measured with higher accuracy. As a result, the phase distribution can be estimated by measuring only the amplitude distribution, and there is no need for a large-scale device capable of positioning with higher precision than in the past. Therefore, there is an effect that the manufacturing cost of the device can be reduced. Further, since the measured antenna does not move with respect to the alignment accuracy, highly accurate measurement is possible even when the measured antenna has a resonance frequency in a high frequency band such as a submillimeter wave. Further, since a plurality of measurement values can be obtained simultaneously with a plurality of probes, it is not necessary to perform a plurality of measurements as in the related art, and the measurement time can be shortened.

According to the present invention, an initial value setting step for presetting an initial value of a phase distribution of the antenna to be measured and an opening having different lengths in the horizontal and vertical directions with respect to the antenna to be measured are provided. An amplitude distribution measuring step in which the probe receives electromagnetic waves radiated from the antenna under measurement in the horizontal and vertical directions with respect to the antenna under measurement, and obtains an amplitude distribution from the electromagnetic waves received by the probe in each direction; And the calculation data from the phase distribution and
An element resulting from the directivity of the probe in each direction is removed from the operation data to obtain an operation data correction value. Based on the operation data correction value, the amplitude distribution and the phase distribution on the measurement surface of the antenna to be measured are calculated. The calculated amplitude distribution is sequentially replaced with each amplitude distribution obtained from the electromagnetic waves received by the probe in each direction, and a correction conversion step of obtaining a data correction value for calculation of the probe in each direction, and the correction conversion step The calculation data correction values of the probe in each direction are compared, and when they substantially match, the amplitude distribution and the phase distribution of the antenna to be measured are obtained based on the calculation data correction values. And a comparison operation step that repeats the above steps. Since it is possible to determine the amplitude and phase distributions of the measured antenna I, there is an effect that can be measured more accurately the radiation characteristics of the antenna under test. As a result, the phase distribution can be estimated by measuring only the amplitude distribution, and there is no need for a large-scale device capable of positioning with higher precision than in the past. Therefore, there is an effect that the manufacturing cost of the device can be reduced. Further, since the measured antenna does not move with respect to the alignment accuracy, highly accurate measurement is possible even when the measured antenna has a resonance frequency in a high frequency band such as a submillimeter wave.

According to the present invention, the initial value of the phase distribution of the measured antenna set in the initial value setting step uses the calculated value calculated based on the shape of the measured antenna. This has the effect of speeding up convergence. In addition, the initial value of the phase distribution does not greatly deviate from the true value, and the reliability of the estimation algorithm can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing an antenna measuring device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a phase estimation algorithm of an antenna measurement method using the antenna measurement device according to the first embodiment of the present invention.

FIG. 3 is a diagram schematically showing an antenna measuring device according to a second embodiment of the present invention.

FIG. 4 is a diagram schematically showing another example of the antenna measuring device according to the second embodiment of the present invention.

5A and 5B are diagrams showing an antenna measuring device according to a third embodiment of the present invention, wherein FIG. 5A is a schematic configuration diagram, and FIG.
FIG. 4 is an enlarged view showing a probe peripheral portion.

FIG. 6 is a diagram showing a schematic configuration of an antenna measuring device using a conventional phase retrieval method.

FIG. 7 is a flowchart showing a process of calculating a phase distribution of an antenna to be measured by a phase retrieval method.

FIG. 8 is an explanatory diagram for explaining a conventional near-field measurement for correcting directivity of a probe.

[Description of Signs] 1 antenna to be measured, 2a first probe (probe), 2b second probe (probe), 2c probe (probe), 3 xy scanner (sliding means), 4
a, 4b transmitter / receiver, 5 arithmetic processor (arithmetic processing means), 6a single-axis rotating table (rotating means), 8 probe polarization rotating device (probe rotating means), 9 x-axis direction driving scanner (sliding means), 10 Two-axis turntable (rotation means) 1
2 Transmitter, A, B rotation axis.

Claims (7)

[Claims] 1. An antenna to be measured, and a plurality of probes provided at positions facing the antenna to be measured and having different sizes and / or shapes of openings for receiving electromagnetic waves radiated from the antenna to be measured, Calculation processing means for obtaining an amplitude distribution from the electromagnetic waves received by the plurality of probes, calculating a phase distribution of the antenna to be measured from the amplitude distribution, and obtaining a radiation characteristic of the antenna to be measured from the amplitude distribution and the phase distribution. Antenna measuring device. 2. An antenna to be measured, provided at a position facing the antenna to be measured, receiving an electromagnetic wave radiated from the antenna to be measured, and receiving an electromagnetic wave in a horizontal direction and a vertical direction with respect to the antenna to be measured. A probe having openings having different lengths; a probe rotating means for rotatably holding the probe and alternately switching a horizontal direction and a vertical direction to the antenna to be measured of the probe; and An antenna processing comprising: calculating an amplitude distribution from an electromagnetic wave received in the direction; calculating a phase distribution of the antenna to be measured from the amplitude distribution; and calculating a radiation characteristic of the antenna to be measured from the amplitude distribution and the phase distribution. apparatus. 3. The antenna measurement according to claim 1, further comprising a sliding means for holding the probe slidably in a horizontal and / or vertical direction with respect to the antenna to be measured. apparatus. 4. The apparatus according to claim 1, further comprising rotating means for holding the antenna to be measured so as to be rotatable about an axis in a direction horizontal and / or perpendicular to the probe. An antenna measuring device according to any one of the preceding claims. 5. An antenna measuring method using the antenna measuring apparatus according to claim 1, wherein an initial value of a phase distribution of an antenna to be measured is set in advance. Initial value setting step, a plurality of probes having different sizes and / or shapes of apertures collectively receive electromagnetic waves radiated from the antenna to be measured, and an amplitude distribution is obtained from the electromagnetic waves received by the plurality of probes. Calculating the amplitude distribution measurement step, calculating the calculation data from the amplitude distribution and the phase distribution, removing the element due to the directivity of the plurality of probes from the calculation data to obtain a calculation data correction value,
The amplitude distribution and the phase distribution on the measurement surface of the measured antenna are calculated based on the calculation data correction value, and the amplitude distribution is sequentially replaced with each amplitude distribution obtained from the electromagnetic waves received by the plurality of probes. A correction conversion step for obtaining each calculation data correction value of the plurality of probes, and each calculation data correction value of the plurality of probes obtained in the correction conversion step is compared. An antenna measurement method for obtaining an amplitude distribution and a phase distribution of the antenna to be measured based on the correction value, and when the values do not substantially match, a comparison operation step of repeating the correction conversion step. 6. An antenna measuring method using the antenna measuring device according to claim 2, wherein an initial value of a phase distribution of an antenna to be measured is set in advance. An initial value setting step, wherein the probe having openings having different lengths in the horizontal direction and the vertical direction with respect to the antenna to be measured, the probe being measured in the horizontal and vertical directions with respect to the antenna to be measured. An electromagnetic wave radiated from the antenna is received, an amplitude distribution measuring step of obtaining an amplitude distribution from the electromagnetic waves received by the probe in each direction, and calculation data is calculated from the amplitude distribution and the phase distribution. An element due to the directivity of the probe in each direction is removed to obtain a data correction value for calculation, and based on this data correction value for calculation, Calculate the amplitude distribution and phase distribution on the measurement surface,
This amplitude distribution is sequentially replaced with each amplitude distribution obtained from the electromagnetic waves received by the probe in each direction, and a correction conversion step of obtaining a data correction value for operation of the probe in each direction, and the correction conversion step obtained by the correction conversion step The calculation data correction values of the probe in each direction are compared, and when they substantially match, the amplitude distribution and the phase distribution of the measured antenna are obtained based on the calculation data correction values. An antenna measurement method, comprising: a comparison operation step of repeating a conversion step. 7. The calculated value calculated based on the shape of the measured antenna is used as the initial value of the phase distribution of the measured antenna set in the initial value setting step. 6. The antenna measuring method according to 6.