JP2000244212A - Waveguide/transmission line converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate miniaturization and high volume production while high power conversion efficiency is maintained. SOLUTION: A shorting metal layer 11 is formed on one face of a dielectric substrate 4 and the shorting metal layer 11 is provided with a slip for arranging a strip line 3. The shorting metal layer 11 and the strip line 3 are arranged on the same face of the dielectric substrate 4 by leaving a prescribed interval. A ground metal layer 5 is made in a form similar to the cross section form of an opening in a waveguide 2. The potentials of the shorting metal layer 11, the ground metal layer 5 and the waveguide 2 are kept to be the same by metals buried in through holes 8 installed around the dielectric substrate 4. A matching element 6 is installed on the face where the ground metal layer 5 of the dielectric substrate 4 is formed. An almost whole waveguide/ transmission line converter 120 except for the waveguide 2 can be constituted on the substrate that is the same as a high frequency circuit and a planar antenna.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveguide / transmission line converter for converting microwave and millimeter wave power.

[0002]

2. Description of the Related Art A waveguide / transmission line converter capable of mutually converting power transmitted by a waveguide and power transmitted by a strip line is disclosed in Japanese Patent Laid-Open No. 10-126114: And the like described in "Feed line converter" are generally known. FIG. 13 is a perspective view of a conventional waveguide / transmission line converter 300, and FIG.
The cross-sectional views (a) and (c) of the converter 300 and the plan view (b) of the bottom surface are shown, respectively.

A strip line 3 is provided on one surface of a dielectric substrate 4, and a ground metal layer 5 connected to an opening of the waveguide 2 is provided on the other surface. Dielectric substrate 4
Is fixed so as to be sandwiched between the short-circuit waveguide block 9 and the waveguide 2. Since high power conversion efficiency is obtained when the strip line 3 is inserted at a position where the electric field in the waveguide 2 is strong, the distance between the short-circuit surface of the short-circuit waveguide block 9 and the strip line 3 is determined by the wavelength in the waveguide. It is set to about １ ／ of λ.

[0004]

In the waveguide / transmission line converter 300 according to the prior art, when the waveguide 2 and the high frequency circuit are connected, the strip line 3 is connected to the plane of the substrate on which the high frequency circuit is formed. Since it is located on the upper side, the short-circuited waveguide block 9 projects vertically from the high-frequency circuit as a projection. In particular, when dealing with microwaves, the height (λ / 4) of the projections may exceed 2 cm, and this short-circuited waveguide block 9 is a hindrance to downsizing the high-frequency circuit.

On the other hand, when a high frequency band such as a millimeter wave is handled, the converter 300 can be used even if a slight displacement occurs between each of the waveguide 2, the short-circuit waveguide block 9, and the strip line 3. In order to obtain high power conversion efficiency, these components must be reduced to 1/10
It is necessary to fix with high positional accuracy of about 0 mm. However, in the above-described conventional structure, it is particularly difficult to fix the short-circuited waveguide block 9 and the waveguide 2 with such high accuracy. The conventional structure requires a waveguide-to-transmission line converter. This is an obstacle to mass production.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a waveguide / transmission line converter that can be easily miniaturized and mass-produced while maintaining high power conversion efficiency. It is to realize.

[0007]

In order to solve the above-mentioned problems, the following means are effective. That is, the first means is a waveguide / transmission line converter capable of mutually converting the power transmitted by the waveguide and the power transmitted by the strip line to the position located at the opening of the waveguide. A short-circuit plate (metal plate) having a notch formed therein, a matching element provided in the waveguide at a predetermined distance from the short-circuit plate and substantially in parallel thereto, and a dielectric substrate positioned between the short-circuit plate and the matching element. With
This is to electromagnetically couple the strip line and the matching element arranged in the notch of the short-circuit plate to each other by arranging them close to each other.

The second means is a waveguide / transmission line converter capable of mutually converting the power transmitted by the waveguide and the power transmitted by the strip line into an aperture of the waveguide. A first dielectric substrate located in the portion, a cut-out short-circuit metal layer provided on the outer surface of the first dielectric substrate, and a substantially constant distance from the short-circuit metal layer in the waveguide in a substantially parallel manner. A matching element provided, and a second dielectric substrate located between the first dielectric substrate and the matching element, wherein the strip line and the matching element arranged at the cut of the short-circuit metal layer are brought close to each other. Is to be electromagnetically coupled to each other.

The third means is a waveguide / transmission line converter capable of mutually converting the power transmitted by the waveguide and the power transmitted by the strip line into an aperture of the waveguide. And a matching metal element provided on the inner surface of the dielectric substrate, and a short-circuit metal layer provided with a notch provided on the outer surface of the dielectric substrate. Is to electromagnetically couple each other by arranging the strip line and the matching element arranged in the notch close to each other.

Further, the fourth means includes the first to third means.
In any one of the above means, a ground metal layer to be joined to the opening of the waveguide is provided on a surface of the dielectric substrate on which the strip line is provided, on a surface opposite to a surface on which the strip line is provided. That is.

[0011] The fifth means may be the second to fourth means described above.
In any one of the means, the dielectric substrate or the first
It is to provide a through hole for electrically connecting the short-circuit metal layer and the waveguide to the dielectric substrate.

Further, the sixth means includes the first to fifth means.
In any one of the means, a plurality of short-circuit plates or strip lines arranged at cuts of the short-circuit metal layer are provided.

Further, the seventh means includes the first to sixth means.
In any one of the means, a dielectric substrate provided with a strip line and a circuit substrate provided with a high-frequency circuit, or a first dielectric substrate and a second dielectric substrate are integrally formed. . According to an eighth aspect, in any one of the first to seventh aspects, the impedance is controlled by a length of the strip line overlapping the matching element. Also,
A ninth means is that, in any one of the first to eighth means, the resonance frequency is controlled by the length of the matching element parallel to the strip line. Also, the first
0 means the distance between the strip line and the matching element in any one of the first to ninth means.
Is a 1λ _g ~0.20λ _g (However, lambda _g is the wavelength in the dielectric existing between the stripline and the matching element) that is. An eleventh means is the device according to any one of the first to tenth means, wherein the distance between the short-circuit metal plate or the short-circuit metal layer and the strip line is 0.0.
Is a 3λ _g ~0.06λ _g (However, lambda _g is the wavelength inside the medium present in the interval) it is. With the above means, the above-mentioned problem can be solved.

[0014]

According to the means of the present invention, the strip line and the matching element arranged at the cut of the short-circuit plate or the short-circuit metal layer are arranged close to each other and electromagnetically coupled to each other. Power conversion is performed by the electromagnetic coupling between the two. Therefore, the short-circuited waveguide block 9 which is indispensable in the configuration of the conventional waveguide / transmission line converter becomes unnecessary. For this reason, the above-mentioned convex portion which has protruded approximately λ / 4 from the substrate plane of the high-frequency circuit is eliminated, and the waveguide / transmission line converter can be flattened (miniaturized).

In addition, since the short-circuited waveguide block 9 has been eliminated, high precision with the restriction of λ / 4 between the short-circuited waveguide block 9 and the waveguide 2, which has been particularly difficult as described above, is required. There is no problem of relative positioning, and manufacturing becomes easier.

Further, according to the means of the present invention, impedance matching can be achieved by the insertion length of the strip line into the waveguide, and transmission and conversion are performed by the size of the matching element and the distance from the strip line. The frequency band can be determined. For example, if the width of the matching element in the longitudinal direction of the waveguide cross-sectional shape is wide, the width of the frequency band is also wide, and the width of the matching element in a direction perpendicular to this determines the cutoff frequency. Further, if the distance between the matching element and the strip line (the thickness of the dielectric substrate interposed) is small, the width of the frequency band is narrowed, and if the distance is widened, the width of the frequency band is also widened. Therefore, by properly adjusting these parameters, a waveguide with low loss at a desired frequency can be used.
It is possible to realize a transmission line converter.

Further, the ground metal layer of the present invention makes it possible to easily and reliably adhere the dielectric substrate provided with the strip line to the waveguide. Therefore, a waveguide / transmission line converter with low power loss can be realized. In addition, when a conductor such as a metal is embedded in the through hole of the present invention, the short-circuit metal layer and the waveguide can be reliably set to the same potential. As a result, a waveguide / transmission line converter with lower power loss can be realized. In addition, it is possible to change the impedance depending on the length of the strip line overlapping the matching element, thereby achieving impedance matching between input and output in the converter. Also, since the resonance frequency can be changed by the length of the matching element parallel to the strip line,
Adjustment of the resonance frequency is facilitated. Further, the distance between the stripline and the matching element With 0.01λ _g ~0.20λ _g, it is possible to reduce the loss in the converter. Also the distance between the short-circuit metal plate or shorting metal layer and the stripline With 0.03λ _g ~0.06λ _g, it is possible to reduce the loss in the converter.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on specific embodiments. (First Embodiment) FIG. 1 is a perspective view of a waveguide / transmission line converter 100 of the present embodiment, and FIG. 2 is a sectional view of the waveguide / transmission line converter 100 (a) and (c). , (D), and a plan view (b) of the bottom surface, respectively.

A strip line 3 is provided on one surface of the dielectric substrate 4, and a rectangular ground metal layer 5 having substantially the same width as the thickness of the side wall of the waveguide 2 is provided on the opposite surface. Have been. These conductors (strip line 3 and ground metal layer 5) are formed by a manufacturing method such as photoetching.

The short-circuit plate 1 is provided with cuts substantially congruent with the planar shape (rectangular shape) of the dielectric substrate 4. The dielectric substrate 4 is fitted into the cut of the short-circuit plate 1 and the ground metal layer 5 is fixed to the opening of the waveguide 2 by welding or soldering, so that the It is fixed to the opening.

A dielectric substrate 7 is provided inside the opening of the waveguide 2, and the dielectric substrate 7 is fixed in close contact with the dielectric substrate 4 and the short-circuit plate 1. At the center of the surface of the dielectric substrate 7 opposite to the strip line 3, a substantially square metal layer is formed by photoetching. Hereinafter, such a metal layer is referred to as “matching element 6” due to its function. Since the matching element 6 is provided close to the strip line 3, both are electromagnetically coupled to each other.

With the above configuration, in the conventional waveguide / transmission line converter 300, there is no longer a protruding portion projecting approximately λ / 4 from the substrate plane of the high-frequency circuit, and the waveguide / transmission line converter can be converted to a plane. (Miniaturization) has become possible. In addition, there has been no problem of high-precision relative positioning between the short-circuited waveguide block 9 and the waveguide 2, which has been particularly difficult in the related art, with the restriction of λ / 4, and the manufacturing has been facilitated.

Further, according to the configuration of the waveguide / transmission line converter 100 of the present embodiment, impedance matching can be achieved by the insertion length of the strip line with respect to the waveguide, and furthermore, transmission can be performed by the area of the matching element. Since the frequency band to be converted can be determined, it is possible to realize a waveguide / transmission line converter having a desired frequency and a small loss. FIG. 9 shows the relationship between the insertion length ρ of the strip line 3 into the waveguide 2 and the input-side voltage standing wave ratio. However, the strip line insertion length ρ is a length in which the strip line 3 and the matching element 6 overlap in a direction parallel to the short side of the waveguide 2, as shown in FIG. The horizontal axis in FIG. 9 shows a value ρ / L (hereinafter, referred to as a normalized strip line insertion length) obtained by normalizing the strip line insertion length ρ by a matching element length L parallel to the short side of the waveguide 2. I have. When the strip line length ρ is 0.11L ≦ ρ ≦ 0.28L or 0.45L
By setting ≦ ρ ≦ 0.73L, the input-side voltage standing wave ratio can be set to 1.5 or less. Thus, the input-side voltage standing wave ratio can be controlled by the strip line length ρ. That is, impedance matching of input and output in the converter can be realized. FIG. 10 shows the matching element length L
And the relationship between the resonance frequency f. Here, the horizontal axis of FIG. 10 indicates a value L / L ₀ (hereinafter, referred to as a normalized matching element length) obtained by normalizing the matching element length L by a predetermined matching element length L ₀ , and the vertical axis of FIG. values were normalized frequency f at a predetermined resonance frequency f ₀ f / f ₀ (hereinafter, referred to as the normalized resonance frequency)
Is shown. The resonance frequency when the matching element length is L ₀ is f ₀ . As the matching element length L increases, the resonance frequency f decreases.
It can be understood that can be controlled. According to the configuration of the waveguide / transmission line converter 100 of the present embodiment, the strip line 3
D in the direction of the tube axis of the waveguide 2 between the sensor and the matching element 6
Even (the total thickness of the dielectric substrate 4 and the dielectric substrate 7 shown in FIG. 2 (a)) the range of 0.01λ _g ≦ d ≦ 0.20λ _g, is possible to realize a low-loss characteristic it can. However, λ _g is the propagation wavelength in the dielectric body. Further, even if the relative permittivity of the dielectric substrate 4 and the dielectric substrate 7 is set to 1 to 10, low-loss characteristics can be realized. For the distance between the short-circuiting plate 1 and the strip line 3, not disturbed electromagnetic field of the strip line 3, moreover, so that power leakage from the gap is suppressed, the gap 0.03λ _g ~0.0
When 6λ _g, can realize a low-loss characteristic. FIG. 11 shows frequency characteristics of the amount of reflection and the amount of transmission of the waveguide / transmission line converter 100. Reflection amount −40 at desired predetermined frequency f ₀
It can be seen that the characteristics are low loss of not more than dB and transmission loss of not more than 0.3 dB. In FIG. 11, the strip line insertion length ρ is 0.18 L, the matching element length L is 0.5λ _g ,
0.05λ spacing d of the waveguide 2 in the tube axis direction of the strip line 3 and the matching element 6 _g, the dielectric substrate 4 and the dielectric substrate 7
Are 2.2, the short-circuit plate 1 and the strip line 3
The interval between a characteristic when formed into a 0.04 _g.

In this embodiment, the dielectric substrate 4
As shown in FIGS. 1 and 2, the dielectric substrate 4 is formed in a substantially congruent shape with the cut of the short-circuit plate 1, and the dielectric substrate 4 is a circuit substrate on which a high-frequency circuit is formed or a dielectric substrate 7
And may be integrally formed. For example, the dielectric substrate 4 may be replaced with a circuit substrate on which a high-frequency circuit is formed and the dielectric substrate 7.
By integrally forming the waveguide and transmission line converter 100, it is possible to more easily realize the miniaturization, cost reduction, and mass production of the waveguide / transmission line converter 100 without deteriorating the power conversion efficiency.

(Second Embodiment) FIG. 3 shows a waveguide / waveguide of this embodiment.
FIG. 4 is a perspective view of the transmission line converter 110, and FIG. 4 is a cross-sectional view of the waveguide / transmission line converter 110.
And a plan view (b) of the bottom surface. This waveguide
The waveguide 2, the strip line 3, of the transmission line converter 110,
The positional relationship between the matching element 6 and the dielectric substrate 7 is the same as the positional relationship between the waveguide / transmission line converter 100 of the first embodiment. Therefore, the present waveguide / transmission line converter 110
Has a conversion function substantially equivalent to that of the waveguide / transmission line converter 100 of the first embodiment.

However, the waveguide-to-transmission line converter 110 has the short-circuiting surface of the short-circuiting plate 1 of the waveguide-to-transmission line converter 100 and the short-circuit metal layer 11 formed on the dielectric substrate. Is that the waveguide of the first embodiment
It is significantly different from the transmission line converter 100.

That is, the present waveguide / transmission line converter 110
A short-circuit metal layer 11 is formed on one surface of the dielectric substrate 4 shown in FIGS. 3 and 4. This short-circuit metal layer 11
Has a notch for arranging the strip line 3, and the short-circuit metal layer 11 and the strip line 3 are arranged on the same surface of the dielectric substrate 4 at regular intervals.

On the other surface of the dielectric substrate 4, a ground metal layer 5 is formed to have a shape substantially congruent with the cross-sectional shape of the opening of the waveguide 2. The short-circuit metal layer 11, the ground metal layer 5, The waveguide 2 is kept at the same potential by a metal embedded in a through hole 8 provided around the dielectric substrate 4. Also, like the waveguide / transmission line converter 100,
The matching element 6 is provided on one surface of the dielectric substrate 7, and the other surface is bonded and fixed to the dielectric substrate 4. As shown in FIG. 3, two through holes 8 a and 8 on both sides of the strip line 3 among the through holes 8.
The position of b affects impedance matching. FIG.
2 shows the relationship between the position g of the two through holes 8a and 8b on both sides of the strip line 3 and the input-side reflection amount. The position g is, as shown in FIG. 3, between the end of the short-circuit metal layer 11 in the direction parallel to the long side of the waveguide 2 and the through holes 8a, 8a.
It is defined by the distance g from the end of b. Short metal layer end - by setting the through-hole edge spacing g to 0.01λ _g ~0.12λ _g, the amount of reflection can be reduced to -20dB or less. In this embodiment, the characteristics shown in FIGS. 9, 10 and 11 are obtained as in the first embodiment. That is, similarly to the first embodiment, the input-side voltage standing wave ratio can be controlled by the strip line length ρ, and therefore, input and output impedance matching in the converter can be realized. Further, the resonance frequency f can be controlled by the matching element length L.
Further, the distance d (the total thickness of the dielectric substrate 4 and the dielectric substrate 7 shown in FIG. 4A) between the strip line 3 and the matching element 6 in the tube axis direction of the waveguide 2 is set to 0.01λ. _g ≤ d
Be in the range of ≦ 0.20λ _g, it is possible to realize a low-loss characteristic. Further, the dielectric substrate 4 and the dielectric substrate 7
Even if the relative permittivity of is 1 to 10, low loss characteristics can be realized. Further, with respect to the spacing between the short-circuiting plate 1 and the strip line 3, when 0.03λ _g ~0.06λ _g, can realize a low-loss characteristic.

Since the dielectric substrate 4 can be extended outward of the waveguide 2, a high-frequency circuit or a planar antenna can be formed in the extended portion. That is, according to the configuration of the present waveguide / transmission line converter 110, the waveguide
Part of the transmission line converter 110 (the dielectric substrate 4, the strip line 3, the short-circuit metal layer 11, the ground metal layer 5, etc.) is formed in the same step as the photo-etching step for forming the high-frequency circuit and the planar antenna Therefore, when a high-frequency circuit or a circuit combining a planar antenna with a waveguide / transmission line converter is configured, the production process can be reduced and simplified, and the production cost can be reduced.

(Third Embodiment) FIG. 5 shows a waveguide / waveguide of this embodiment.
FIG. 6 is a perspective view of the transmission line converter 120, and FIG. 6 is a sectional view (a) and (c) of the waveguide / transmission line converter 120 and a plan view (b) of the bottom surface, respectively. The waveguide / transmission line converter 120 of this embodiment excludes the dielectric substrate 7 of the waveguide / transmission line converter 110 of the second embodiment from its components, and replaces the matching element 6 with the ground metal of the dielectric substrate 4. It is formed on the same surface as the surface on which the layer 5 is formed.

That is, a short-circuit metal layer 11 is formed on one surface of the dielectric substrate 4 of the present waveguide / transmission line converter 120, and the short-circuit metal layer 11 arranges the strip line 3. It has a notch for it. Short-circuit metal layer 11
And the strip line 3 are arranged on the same surface of the dielectric substrate 4 at a constant interval.

On the other surface of the dielectric substrate 4, a ground metal layer 5 is formed in a substantially congruent shape with the sectional shape of the opening of the waveguide 2, and the short-circuit metal layer 11, the ground metal layer 5, The waveguide 2 is kept at the same potential by a metal embedded in a through hole 8 provided around the dielectric substrate 4. A matching element 6 is provided on the surface of the dielectric substrate 4 on which the ground metal layer 5 is formed.

As described above, the waveguide / transmission line converter 120
, Almost all of the waveguide / transmission line converter 120 except for the waveguide 2 can be formed on the same substrate (dielectric substrate 4) as the high-frequency circuit and the planar antenna, and its manufacture The process can be realized in the same process as the photoetching process for forming the high-frequency circuit and the planar antenna.

Further, according to the configuration of the waveguide / transmission line converter 120, it is not necessary to consider a position error in forming the matching element 6 at all, so that mass production is greatly facilitated. Therefore, high-frequency circuits and planar antennas and waveguides
In the case of configuring a circuit in combination with the transmission line converter, the number of production steps can be further reduced and simplified as compared with the case of the waveguide / transmission line converter 110 of the second embodiment, and the production cost can be reduced. In this embodiment, the characteristics shown in FIGS. 9, 10 and 11 are obtained as in the first and second embodiments. That is, similarly to the first and second embodiments, the input-side voltage standing wave ratio can be controlled by the strip line length ρ, so that the input and output impedance matching in the converter can be realized. Further, the resonance frequency f can be controlled by the matching element length L. Further, a distance d between the strip line 3 and the matching element 6 in the tube axis direction of the waveguide 2 (FIG. 6A)
The dielectric substrate 4 thickness) shown in 0.01λ _g ≦ d ≦ 0.2
Be in the range of 0λ _g, it is possible to realize a low-loss characteristic. Further, even if the relative permittivity of the dielectric substrate 4 is set to 1 to 10, low loss characteristics can be realized. Further, regarding the distance between the short-circuit metal layer 11 and the strip line 3,
When 0.03λ _g ~0.06λ _g, it can realize a low-loss characteristic. Further, similarly to the second embodiment, the characteristics shown in FIG. 12 are obtained. That is, short-circuit metal layer end - by setting the through-hole edge spacing g to 0.01λ _g ~0.12λ _g, the amount of reflection can be reduced to -20dB or less.

(Fourth Embodiment) In the first to third embodiments, only one strip line 3 is provided in any waveguide-to-transmission line converter. For example, as in the case of the waveguide / transmission line converter 140 in FIG. 7, a plurality of may be provided on the waveguide short-circuit surface. FIG. 7 is a perspective view of a waveguide / transmission line converter 140 in which a plurality of (two) strip lines 3 are provided on the waveguide short-circuit surface, and FIG. Sectional views (a), (c) and (d) and a plan view (b) of the bottom surface are shown, respectively. 3 and 4 of the second embodiment, and FIGS. 5 and 6 of the third embodiment, it is obvious that a configuration in which a plurality of strip lines 3 are provided can be similarly applied.

The present waveguide / transmission line converter 140 has a first
Two cuts are provided on the short-circuit plate 1 of the waveguide / transmission line converter 100 of the embodiment in a symmetrical manner (plan view (b)), and one strip line 3 is arranged at each cut. Can be considered. That is, this waveguide
The transmission line converter 140 is different from the transmission line converter 140 in points other than the number of cuts provided in the short-circuit plate 1 and the number of the strip lines 3.
It has the same structure as the waveguide / transmission line converter 100.

By providing a plurality of strip lines 3 on the waveguide short-circuit surface in this manner, the waveguide / transmission line converter can convert the power transmitted by one waveguide 2 into a plurality of strip lines. A microwave splitter for splitting and converting power transmitted by the stripline 3 and a microwave for combining and converting power transmitted by a plurality of striplines 3 to power transmitted by one waveguide 2 It can also be used as a synthesizer.

In the present waveguide / transmission line converter 140, there are two cuts provided in the short-circuiting plate 1 and two strip lines 3 each.
In the above embodiments, the number of cuts provided in the short-circuit plate 1 and the short-circuit metal layer 11 may be plural, and the cut and the strip line 3 are not necessarily one-to-one. It is not necessary to correspond to.

In the second and third embodiments, the ground metal layer 5 is formed substantially congruently with the shape of the opening of the waveguide 2 (the cross-sectional shape of the waveguide 2). The ground metal layer 5 may be further formed to extend inward of the waveguide 2. For example, the shape of the ground metal layer 5 in the waveguide / transmission line converter 120 of the third embodiment is such that the distance between the ground metal layer 5 and the matching element 6 is maintained at a certain value or more. It is optional as long as it includes the cross-sectional area of the opening.

In the above embodiment, the matching element 6
Is a rectangle, but the shape of the matching element 6 is not particularly limited, and may be a circle, a ring, or the like.

In each of the above embodiments, although not particularly mentioned, the inside of the waveguide may be filled with a dielectric or the like.

[Brief description of the drawings]

FIG. 1 is a perspective view of a waveguide / transmission line converter 100 according to a first embodiment.

FIG. 2 is a sectional view (a), (c), (d) of the waveguide / transmission line converter 100 of the first embodiment, and a plan view (b) of a bottom surface.

FIG. 3 is a perspective view of a waveguide / transmission line converter 110 according to a second embodiment.

FIG. 4 is a sectional view (a), (c), (d) of a waveguide / transmission line converter 110 according to a second embodiment, and a plan view (b) of a bottom surface.

FIG. 5 is a perspective view of a waveguide / transmission line converter 120 according to a third embodiment.

FIGS. 6A and 6C are sectional views (a) and (c) of a waveguide / transmission line converter 120 according to a third embodiment, and a plan view (b) of a bottom surface.

FIG. 7 is a perspective view of a waveguide / transmission line converter 140 according to a fourth embodiment.

8 (a), (c), (d) and a plan view (b) of a bottom surface of a waveguide / transmission line converter 140 according to a fourth embodiment.

FIG. 9 is a characteristic diagram obtained by measuring a relationship between a normalized strip line insertion length and a voltage standing wave ratio of the waveguide / transmission line converter 100 according to the first embodiment.

FIG. 10 is a waveguide / transmission line converter 100 of the first embodiment.
FIG. 4 is a characteristic diagram obtained by measuring the relationship between the normalized matching element length and the normalized resonance frequency.

FIG. 11 is a waveguide / transmission line converter 100 of the first embodiment.
FIG. 4 is a characteristic diagram obtained by measuring a relationship between a normalized frequency of the data and a reflection amount and a transmission amount.

FIG. 12 shows a waveguide / transmission line converter 110 according to a second embodiment.
5 is a characteristic diagram obtained by measuring the relationship between the normalized short-circuit metal layer end-through hole end interval and the amount of reflection.

FIG. 13 is a perspective view of a conventional waveguide / transmission line converter 300.

FIGS. 14A and 14B are cross-sectional views (a) and (c) of a conventional waveguide / transmission line converter 300, and a plan view (b) of a bottom surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Short circuit board 2 ... Waveguide 3 ... Strip line 4, 7 ... Dielectric substrate 5 ... Ground metal layer 6 ... Matching element 8 ... Through hole 11 ... Short circuit metal layer

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kazuo Sato 41-Cho, Yokomichi, Nagakute-cho, Aichi-gun, Aichi Prefecture Inside Toyota Central Research Laboratory Co., Ltd. No. 41, Yokomichi, Toyota Central Research Institute, Inc.

Claims (11)

[Claims] 1. A waveguide / transmission line converter capable of mutually converting power transmitted by a waveguide and power transmitted by a strip line, wherein the converter is located at an opening of the waveguide. A cut-off short circuit plate, a matching element provided in the waveguide at a predetermined distance from the short-circuit plate and substantially parallel to the short-circuit plate, and a dielectric substrate positioned between the short-circuit plate and the matching element. A waveguide / transmission line converter, wherein the strip line disposed in the cut and the matching element are electromagnetically coupled to each other by being disposed close to each other. 2. A waveguide / transmission line converter capable of mutually converting power transmitted by a waveguide and power transmitted by a stripline, wherein the converter is located at an opening of the waveguide. A first dielectric substrate, a notched short-circuit metal layer provided on an outer surface of the first dielectric substrate, and substantially parallel to the inside of the waveguide at a predetermined distance from the short-circuit metal layer. A matching element provided, and a second dielectric substrate located between the first dielectric substrate and the matching element, wherein the strip line disposed in the cut and the matching element are A waveguide / transmission line converter characterized by being electromagnetically coupled to each other by being arranged close to each other. 3. A waveguide / transmission line converter capable of mutually converting power transmitted by a waveguide and power transmitted by a strip line, wherein the converter is located at an opening of the waveguide. A cut-out short-circuit metal layer provided on the outer surface of the dielectric substrate, and a matching element provided on the inner surface of the dielectric substrate. A waveguide / transmission line converter, wherein the strip line and the matching element are electromagnetically coupled to each other by being arranged close to each other. 4. The dielectric substrate provided with the strip line, further comprising: a ground metal layer bonded to an opening of the waveguide on a surface opposite to a surface provided with the strip line. 4. The method according to claim 1, further comprising:
The waveguide / transmission line converter according to the paragraph. 5. The dielectric substrate or the first dielectric substrate has a through hole for electrically connecting the short-circuit metal layer and the waveguide. The waveguide / transmission line converter according to claim 1. 6. The waveguide / transmission line converter according to claim 1, comprising a plurality of the strip lines arranged in the cuts. 7. The dielectric substrate provided with the strip line and a circuit substrate provided with a high-frequency circuit, or the first dielectric substrate and the second dielectric substrate are integrally formed. The waveguide / transmission line converter according to any one of claims 1 to 6, wherein: 8. The waveguide / transmission line according to claim 1, wherein impedance is controlled by a length of the strip line overlapping the matching element. converter. 9. The waveguide / transmission line according to claim 1, wherein a resonance frequency is controlled by a length of the matching element parallel to the strip line. converter. Distance between wherein said strip line and said matching element is 0.01λ _g ~0.20λ _g (However,
10. The waveguide / transmission line conversion according to claim 1, wherein λ _g is a wavelength in a dielectric existing between the strip line and the matching element. 10. vessel. 11. A distance between the short-circuit metal plate or the short-circuit metal layer and the strip line is 0.03λ _{g to} 0.06.
a lambda _g (However, lambda _g is the wavelength inside the medium present in the gap) that claims 1 to any one waveguide-transmission line converter according to claim 10, characterized in vessel.