CN114069256B - Dual-frenquency double circular polarization folding reflection array antenna - Google Patents
Dual-frenquency double circular polarization folding reflection array antenna Download PDFInfo
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- CN114069256B CN114069256B CN202111341584.5A CN202111341584A CN114069256B CN 114069256 B CN114069256 B CN 114069256B CN 202111341584 A CN202111341584 A CN 202111341584A CN 114069256 B CN114069256 B CN 114069256B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
- H01Q15/242—Polarisation converters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
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Abstract
The invention provides a dual-frequency dual-circularly polarized folded array antenna, which aims to simplify an antenna structure and widen the functional range of the circularly polarized folded array antenna while guaranteeing the radiation characteristic of the circularly polarized folded array antenna, and comprises a main reflector, an auxiliary transmission mirror, a supporting structure and a feed source; the main reflector comprises a first medium substrate with a hollowed center, wherein square annular metal patches which are periodically arranged are printed on the upper surface of the medium substrate, the square annular metal patches are used for realizing linear polarization conversion and conversion from spherical waves to plane waves, and a metal floor is printed on the lower surface of the medium substrate; the auxiliary transmission mirror comprises a second dielectric substrate and a third dielectric substrate which are vertically stacked, wherein a metal floor with a leaky wave slot is printed on the lower surface of the second dielectric substrate, two circular metal patches with different specifications are printed on the upper surface of the second dielectric substrate and the lower surface of the third dielectric substrate, and the circular metal patches are connected through a metallized via hole penetrating through the leaky wave slot, so that the dual-frequency dual-circular polarization radiation characteristic is realized.
Description
Technical Field
The invention belongs to the technical field of antennas, relates to a folding reflective array antenna, and in particular relates to a dual-frequency dual-circular polarization folding reflective array antenna which can be used in the field of wireless satellite communication.
Technical Field
The uplink signal and the downlink signal in the wireless satellite communication generally adopt the same path, and if a pair of antennas with the same frequency band and the same polarization are adopted as the receiving and transmitting antennas, signal interference can not be avoided. Therefore, in radio satellite communications, two antennas with different frequency bands and different polarizations are generally selected as the transmitting and receiving antennas. In addition, compared with a linear polarization antenna, the circular polarization antenna has the advantages of minimum polarization mismatch component and environment interference suppression, and is more advantageous in a wireless satellite communication system.
The reflection array antenna is used as a planar high-gain antenna, is very suitable for long-distance communication such as satellite communication, has the advantages of simple structure, low processing cost, small volume, easy realization and the like, and has been widely applied to the field of wireless satellite communication. The reflective array antenna adopts a space feed mode, so that the volume of the reflective array antenna is larger; in addition, the feed source loudspeaker is arranged in front of the radiation caliber and can shield the normal radiation of electromagnetic waves. In order to solve the problems of large volume and shielding effect, W.Menzel and D.pilz in 1998 propose a folding reflective array antenna which consists of a main reflector with polarization torsion characteristics and a polarization grating with polarization selection characteristics, so that the section height of the reflective array antenna is reduced to be one half of the focal length of a main surface, and the volume of the reflective array antenna is greatly reduced. However, the main design goal of such folded reflective array antennas is to achieve linearly polarized high gain radiation.
In order to realize the circular polarization radiation characteristic of the folded reflective array antenna, as in the patent application with the application publication number of CN111636005A, named as a fully integrated wide-angle scanning circular polarization folded reflective array antenna, a circular polarization folded reflective array antenna is disclosed, the invention comprises a main reflector, a polarization grating array, a polarization converter and a plurality of feed antennas integrated on the main reflector, wherein the main reflector and the polarization grating array form a traditional folding reflective array structure, electromagnetic waves radiated by the feed sources can be converted into linear polarization high-gain beams, and the polarization converter is used for converting the linear polarization beams into circular polarization beams. The invention has the following defects: the circularly polarized radiation is realized by adding the polarization converter in front of the radiation caliber, so that the structure of the antenna is more complex, and the processing cost is increased; meanwhile, the antenna can only realize single-frequency single-circular polarization radiation, and two folding reflective array antennas are required to be equipped for uplink and downlink communication in a satellite communication system.
However, in the face of the more complex communication environment at present, if the function of dual-frequency dual-circular polarization can be realized by adopting one antenna, the design cost of the satellite communication system can be reduced, and the structure of the satellite communication system is simplified, so that the realization of dual-frequency dual-circular polarization radiation by widening the function of the folded reflective array antenna has important significance; meanwhile, if the functions of the polarization converter and the polarization grating can be combined, and the functions of polarization selection and conversion from linear polarization to circular polarization can be simultaneously realized, the antenna structure can be simplified and the processing cost can be reduced.
Disclosure of Invention
The invention mainly aims to overcome the defects of the prior art, provides a double-frequency double-circular polarization folded reflective array antenna, and aims to simplify the antenna structure and widen the functional range of the circular polarization folded reflective array antenna while guaranteeing the radiation characteristics of the circular polarization folded reflective array antenna.
In order to achieve the above object, the present invention adopts a technical scheme including a main mirror 1 and a sub-transmission mirror 3 fixed at a half focal length position of the main mirror 1 through a supporting structure 2 of a nonmetallic material, wherein:
The main reflector 1 comprises a square first medium substrate 11 with a hollowed center, wherein M multiplied by N square annular metal patches 111 with double openings and periodically arranged are printed on the upper surface of the first medium substrate 11, wherein M is more than or equal to 8, N is more than or equal to 8, the rotation direction and the opening size of each square annular metal patch 111 are determined by phase compensation values phi P (x, y) of the positions of the square annular metal patches 111, and a first metal floor 112 is printed on the lower surface of the first medium substrate 11;
The auxiliary transmission mirror 3 comprises a second dielectric substrate 31 and a third dielectric substrate 32 which are stacked up and down; the upper surface of the second dielectric substrate 31 is printed with p×q first circular metal patches 311 which are periodically arranged, and each four first circular metal patches 311 are printed with a second circular metal patch 312 at the junction position to form an array including r×s second circular metal patches 312, where P is less than or equal to M, Q is less than or equal to N, r=p-1, and s=q-1; a rectangular notch is etched at each of two intersection points of any one diameter and circumference of the first circular metal patch 311 and the second circular metal patch 312, so as to realize dual-frequency dual-circular polarization radiation characteristics, C-shaped gaps are etched at the center positions of the first circular metal patch 311 and the second circular metal patch 312, and the C-shaped gaps on the first circular metal patch 311 are perpendicular to the opening direction of the C-shaped gaps on the second circular metal patch 312; the lower surface of the second dielectric substrate 31 is printed with a second metal floor 313, and the corresponding positions of the second metal floor 313 and the first circular metal patch 311 and the second circular metal patch 312 are etched with a wave leakage gap 3131; a third circular metal patch 321 is printed on the lower surface of the third dielectric substrate 32 at the projection position of each first circular metal patch 311, a fourth circular metal patch 322 is printed on the projection position of each second circular metal patch 312, C-shaped gaps are etched at the center positions of the third circular metal patch 321 and the fourth circular metal patch 322, and the opening directions of the C-shaped gaps on the third circular metal patch 321 and the C-shaped gaps on the fourth circular metal patch 322 are the same; the first circular metal patch 311 is connected to the third circular metal patch 321 at the corresponding position thereof, and the second circular metal patch 312 is connected to the fourth circular metal patch 322 at the corresponding position thereof through the metallized via hole 33 passing through the leaky wave slot 3131;
according to the dual-frequency dual-circular polarization folded reflective array antenna, the hollow-out position of the center of the main reflector 1 is fixed with the feed source 4, and the phase center of the feed source 4 coincides with the center position of the main reflector 1.
The center normal line of the main reflector 1 and the center normal line of the auxiliary transmission mirror 3 are overlapped.
The above-mentioned dual-band dual-circularly polarized folded array antenna, the square annular metal patch 111 with dual openings, wherein two openings are arranged on a pair of opposite corners of the square annular shape, two V-shaped metal patches 1111 on the other pair of opposite corners of the square annular shape form a dual V-shaped structure, and a rectangular metal strip 1112 is connected between the two V-shaped metal patches 1111 in the dual V-shaped structure; the calculation formula of the phase compensation value Φ P (x, y) of the position where the square annular metal patch 111 with the double openings is located is as follows:
Where k is the wavenumber in free space, (x, y) is the center coordinate of the square annular metal patch 111 with double openings, f is the focal length of the primary mirror 1, and Φ 0 is any constant phase value.
In the dual-frequency dual-circularly polarized folded array antenna, the specification of the first circular metal patch 311 is the same as that of the third circular metal patch 321, the C-shaped slit specifications etched on the first circular metal patch 311 and the third circular metal patch 321 are the same, and the center normals of the first circular metal patch 311 and the third circular metal patch 321 are overlapped; the third circular metal patch 312 has the same specification as the fourth circular metal patch 322, the third circular metal patch 312 and the fourth circular metal patch 322 have the same specification of the C-shaped slit etched on them, and the third circular metal patch 312 coincides with the center normal of the fourth circular metal patch 322.
According to the double-frequency double-circular polarization folding reflective array antenna, the feed source 4 adopts a rectangular horn antenna structure.
Compared with the prior art, the invention has the following advantages:
1. According to the invention, the C-shaped gaps are etched on the third circular metal patch and the fourth circular metal patch to form an anisotropic structure, so that the function of polarization selection can be realized, meanwhile, the third circular metal patch and the fourth circular metal patch can couple linear polarization electromagnetic waves to the first circular metal patch and the second circular metal patch through the metal through holes to form circular polarization electromagnetic waves, so that the functions of the polarization grid and the functions of the polarization converter are combined, the defect of complex structure caused by directly loading the polarization converter in front of the polarization grid in the prior art is avoided, and the processing cost is effectively reduced.
2. The two dielectric substrates included in the auxiliary transmission mirror are printed with two metal patches with different specifications, the combination of the first circular metal patch and the third circular metal patch can realize right-hand circular polarization radiation under low frequency, and the combination of the second circular metal patch and the fourth circular metal patch can realize left-hand circular polarization radiation under high frequency, so that the limitation that the prior art can only realize single-frequency single-circular-pole radiation is avoided, the radiation characteristics are ensured, and the functional range of the circular polarization folded reflective array antenna is widened.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of the primary mirror of the present invention, and a partial enlarged view of a square annular metal patch with dual openings;
Fig. 3 is a schematic structural view of a secondary transmission mirror according to the present invention, in which fig. 3 (a) is a schematic structural view of an upper surface of a second dielectric substrate in the secondary transmission mirror and a partial enlarged view of a first circular metal patch and a second circular metal patch, fig. 3 (b) is a sectional view of the secondary transmission mirror at a cross section of fig. 3 (a), fig. 3 (c) is a schematic structural view of a lower surface of the second dielectric substrate in the secondary transmission mirror, and fig. 3 (d) is a schematic structural view of a lower surface of a third dielectric substrate and a partial enlarged view of a third circular metal patch and a fourth circular metal patch in the secondary transmission mirror;
FIG. 4 is a graph of reflectance for low frequency operation of an embodiment of the present invention;
FIG. 5 is an E-plane radiation pattern at a frequency of 12.5GHz in accordance with an embodiment of the invention;
FIG. 6 is an H-plane radiation pattern at a frequency of 12.5GHz in accordance with an embodiment of the present invention;
FIG. 7 is a graph of axial ratio for right-hand circular polarization at a frequency of 12.5GHz in accordance with an embodiment of the present invention;
FIG. 8 is a graph of reflectance for high frequency operation of an embodiment of the present invention;
FIG. 9 is an E-plane radiation pattern at a frequency of 14.2GHz in accordance with an embodiment of the present invention;
FIG. 10 is an H-plane radiation pattern at a frequency of 14.2GHz in accordance with an embodiment of the present invention;
FIG. 11 is a graph of axial ratio for left-hand circular polarization at a frequency of 14.2GHz in accordance with an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and specific embodiments.
Referring to fig. 1, the present invention includes a main mirror 1 and a sub-transmission mirror 3 fixed at a half focal length position of the main mirror 1 by a support structure 2 of a nonmetallic material; the center normal line of the main reflector 1 and the center normal line of the auxiliary transmission mirror 3 are coincident; a feed source 4 is fixed at the hollow position of the center of the main reflector 1, and the phase center of the feed source 4 coincides with the center position of the main reflector 1; and the feed source 4 adopts a rectangular horn antenna structure.
Referring to fig. 2, the main reflector 1 includes a square first dielectric substrate 11 with a hollowed-out center; the first dielectric substrate 11 is a dielectric substrate with caliber dimension of 156mm×156mm, thickness of 3mm and dielectric constant of 3.5;
the upper surface of the first dielectric substrate 11 is printed with 30×30 square annular metal patches 111 with double openings which are periodically arranged, and the lower surface is printed with a first metal floor 112; the spacing between the central positions of two adjacent square annular metal patches 111 is 5mm, and the caliber of the whole row formed by the square annular metal patches 111 with double openings, which are arranged periodically, is 150mm multiplied by 150mm and is slightly smaller than the caliber of the first medium substrate 11, and the caliber of the first medium substrate 11 is 156mm multiplied by 156mm so as to be matched with the size of the auxiliary transmission mirror 3;
the square annular metal patches 111 with double openings, wherein two openings are arranged on a pair of opposite corners of the square annular shape, two V-shaped metal patches 1111 on the other pair of opposite corners of the square annular shape form a double V-shaped structure, and a rectangular metal strip 1112 is connected between the two V-shaped metal patches 1111 in the double V-shaped structure; the dimensions of the square annular metal patch 111 are: w=0.3 mm; the rotation direction and opening size of the square annular metal patch 111 with double openings are determined by the phase compensation value Φ P (x, y) of the position where the square annular metal patch is located, and the calculation formula of Φ P (x, y) is as follows:
where k is the wavenumber in free space, (x, y) is the center coordinate of the square annular metal patch 111 with double openings, f is the focal length of the primary mirror 1 and f 1＝135mm,Φ0 is an arbitrary constant phase value. When the rotation direction of the square annular metal patch 111 is α= -45 ° and the opening size d is changed from 1mm to 5mm, the phase of the square annular metal patch 111 is changed to [ -5 °,179 ° ]; when the rotation direction of the square annular metal patch 111 is β= +45° and the opening size d is changed from 1mm to 5mm, the phase of the square annular metal patch 111 is changed to [ -180 °,5 ° ]; the combination of square annular metal patches 111 with rotation directions of-45 ° and +45° realizes a phase change of 360 °, and according to the phase compensation value Φ P (x, y) of the position where each square annular metal patch 111 is located, the phase of the square annular metal patch 111 itself is compared, so that the rotation direction and the opening size of each square annular metal patch 111 can be determined.
Referring to fig. 3, the secondary transmission mirror 3 includes a second dielectric substrate 31 and a third dielectric substrate 32 stacked up and down, wherein the second dielectric substrate 31 and the third dielectric substrate 32 are each a dielectric substrate having a caliber size of 156mm×156mm, a thickness of 1.5mm, and a dielectric constant of 3.5;
13×13 first circular metal patches 311 arranged periodically are printed on the upper surface of the second dielectric substrate 31, the central position interval between two adjacent first circular metal patches 311 is 12mm, and each four first circular metal patches 311 are printed with a second circular metal patch 312 at the intersection point position to form an array comprising 12×12 second circular metal patches 312;
A rectangular notch is etched at each of two intersection points of any one diameter and circumference of the first circular metal patch 311 and the second circular metal patch 312 for realizing dual-frequency dual-circular polarization radiation characteristics, a C-shaped slit is etched at each of the center positions of the first circular metal patch 311 and the second circular metal patch 312, and the opening directions of the C-shaped slit on the first circular metal patch 311 and the C-shaped slit on the second circular metal patch 312 can be selected to be arbitrary directions, but the opening directions of the two are required to be perpendicular to each other;
The radius of the first circular metal patch 311 is 3.2mm, the size of the rectangular notch is d 1＝0.51mm,d2 =2.2 mm, the outer diameter and the inner diameter of the c-shaped gap are 1.75mm and 1.45mm, respectively, and the opening of the c-shaped gap is 0.8mm; the radius of the second circular metal patch 312 is 2.7mm, the size of the rectangular notch is d 3＝0.22mm,d4 =2.4 mm, the outer diameter and the inner diameter of the c-shaped slit are 1.45mm and 1.15mm respectively, and the opening of the c-shaped slit is 1.0mm;
The lower surface of the second dielectric substrate 31 is printed with a second metal floor 313, and corresponding positions of the second metal floor 313 and the first circular metal patch 311 and the second circular metal patch 312 are etched with a wave leakage gap 3131, wherein the radius of the wave leakage gap 3131 is 0.4mm;
A third circular metal patch 321 is printed on the lower surface of the third dielectric substrate 32 at the projection position of each first circular metal patch 311, a fourth circular metal patch 322 is printed on the projection position of each second circular metal patch 312, C-shaped gaps are etched at the center positions of the third circular metal patch 321 and the fourth circular metal patch 322, and the opening directions of the C-shaped gaps on the third circular metal patch 321 and the C-shaped gaps on the fourth circular metal patch 322 are the same; the radius of the third circular metal patch 321 is 3.2mm, the outer diameter and the inner diameter of the C-shaped gap are 1.75mm and 1.45mm respectively, and the opening of the C-shaped gap is 0.8mm; the radius of the fourth round metal patch 322 is 2.7mm, the outer diameter and the inner diameter of the c-shaped slit are 1.45mm and 1.15mm, respectively, and the opening of the c-shaped slit is 1.0mm;
Preferably, when the opening direction of the C-shaped slit on the third circular metal patch 321 is the same as that of the C-shaped slit on the first circular metal patch 311, and the opening direction of the C-shaped slit on the fourth circular metal patch 322 is perpendicular to that of the C-shaped slit on the second circular metal patch 312, the sub-transmission mirror 3 will obtain the best dual-frequency dual-circular polarization characteristic;
the first circular metal patch 311 and the third circular metal patch 321 corresponding to the first circular metal patch 311 are connected with the second circular metal patch 312 and the fourth circular metal patch 322 corresponding to the second circular metal patch through a metallized via hole 33 passing through a leaky wave slot 3131, and the radius of the metallized via hole 33 is 0.2mm;
The first circular metal patch 311 coincides with the center normal of the third circular metal patch 321; the third circular metal patch 312 coincides with the center normal of the fourth circular metal patch 322.
The working principle of the invention is as follows:
1. The function of the main mirror 1 will be described first: the annular metal patch 111 above the main reflector 1 can convert the linearly polarized electromagnetic wave from the feed source 4 into the cross linearly polarized electromagnetic wave thereof; meanwhile, when the annular metal patches 111 above the main reflector 1 are arranged in a gradient manner according to the phase compensation values thereof, spherical waves radiated by the feed source are converted into plane waves.
2. Next, the function of the sub-transmission mirror 3 will be described: under the excitation of low-frequency linear polarization waves, the third circular metal patch 321 can couple the received electromagnetic waves to the first circular metal patch 311 through the metallized via hole 33, so that the conversion from linear polarization to right-hand circular polarization is realized; under the excitation of high-frequency linear polarization waves, the fourth circular metal patch 322 can couple the received electromagnetic waves to the second circular metal patch 312 through the metallized via hole 33, so that the conversion from linear polarization to left-hand circular polarization is realized; at the same time, the auxiliary transmission mirror 3 can perfectly reflect the electromagnetic wave with orthogonal linear polarization.
3. When the main mirror 1 and the sub-transmission mirror 3 are combined, the linear polarized wave from the feed source is irradiated to the main mirror 1 by total reflection when irradiated to the sub-transmission mirror 3, the linear polarized wave is converted into the orthogonal linear polarized wave by the main mirror 1, the conversion from the spherical wave to the plane wave is realized, and finally the orthogonal linear polarized wave is transmitted out from the sub-transmission mirror 3, thereby realizing right-hand circular polarized radiation at low frequency and left-hand circular polarized radiation at high frequency.
The technical effects of the present invention are further described below through simulation experiments.
1. Conditions and content are simulated.
The above embodiments were simulated using commercial simulation software CST Microwave Studio.
Simulation 1, simulation of reflection coefficients of the specific examples at 11.9 GHz-12.9 GHz, and the results are shown in FIG. 4;
Simulation 2, which is to simulate a two-dimensional radiation gain curve of the specific embodiment at the frequency of 12.5GHz, and the results are shown in fig. 5 and 6;
Simulation 3, which simulates an axial ratio curve of the specific embodiment at the frequency of 12.5GHz, and the result is shown in fig. 7;
Simulation 4, which is to simulate the reflection coefficient of the specific embodiment between 14.0GHz and 14.6GHz, and the result is shown in FIG. 8;
Simulation 5, which is to simulate a two-dimensional radiation gain curve of the specific embodiment at the frequency of 14.2GHz, and the results are shown in fig. 9 and 10;
Simulation 6, which is to simulate the axial ratio curve of the specific embodiment at the frequency of 14.2GHz, and the result is shown in fig. 11;
2. And (5) analyzing simulation results.
Referring to fig. 4, the reflection coefficient of the folded reflective array antenna is shown, and simulation results show that the reflection coefficient is lower than-10 dB in the frequency band range of 11.95-12.80 GHz, and the antenna can realize good matching in the frequency band range;
Referring to fig. 5 and 6, far field patterns of the folded reflective array antenna are shown, and simulation results show that better high-gain radiation is realized by right-hand circular polarization, left-hand circular polarization waves are completely suppressed, the maximum gain of the right-hand circular polarization under the E plane and the H plane is 22.7dBic, and the maximum gain of the left-hand circular polarization under the E plane and the H plane is 4.17dBic;
Referring to fig. 7, the corresponding axial ratio of the right-hand circularly polarized beam of the folded reflective array antenna is shown, and simulation results show that the lower axial ratio of the E plane and the H plane is 1.57dB, which shows that the folded reflective array antenna realizes perfect right-hand circularly polarized radiation under the low frequency condition;
Referring to fig. 8, the reflection coefficient of the folded reflective array antenna is shown, and simulation results show that the reflection coefficient is lower than-10 dB in the frequency band range of 14.04-14.53 GHz, and that the antenna can achieve good matching in the frequency band range;
Referring to fig. 9 and 10, far field patterns of the folded reflective array antenna are shown, and simulation results show that better high-gain radiation is realized by the left-hand circular polarization, right-hand circular polarization waves are completely suppressed, the maximum gain of the left-hand circular polarization under the E plane and the H plane is 24.5dBic, and the maximum gain of the right-hand circular polarization under the E plane and the H plane is 2.4dBic;
Referring to fig. 11, the corresponding axial ratio of the left-hand circularly polarized beam of the folded reflective array antenna is shown, and simulation results show that the axial ratios of the E plane and the H plane are 1.37dB, which shows that the folded reflective array antenna realizes perfect left-hand circularly polarized radiation under the high frequency condition.
The above description is only of preferred embodiments of the present invention and is not intended to limit the invention, but it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the innovative concepts of the invention, but these variations fall within the scope of the invention.
Claims (5)
1. A dual-frenquency dual-circular polarization folding reflection array antenna, its characterized in that: comprising a main mirror (1) and a secondary transmission mirror (3) fixed in a half focal length position of the main mirror (1) by a support structure (2) of non-metallic material, wherein:
The main reflector (1) comprises a square first medium substrate (11) with hollowed-out center, wherein M multiplied by N square annular metal patches (111) with double openings are printed on the upper surface of the first medium substrate (11), M is more than or equal to 8, N is more than or equal to 8, the rotation direction and the opening size of each square annular metal patch (111) are determined by phase compensation values phi P (x, y) of the positions of the square annular metal patches (111), two openings of the square annular metal patches (111) are arranged on a pair of opposite corners of the square annular, two V-shaped metal patches (1111) on the other pair of opposite corners of the square annular form a double V-shaped structure, rectangular metal strips (1112) are connected between the two V-shaped metal patches (1111) in the double V-shaped structure, and the x, y are center coordinates of the square annular metal patches (111) with the double openings; the lower surface of the first dielectric substrate (11) is printed with a first metal floor (112);
The sub-transmission mirror (3) comprises a second dielectric substrate (31) and a third dielectric substrate (32) which are stacked up and down; p multiplied by Q first circular metal patches (311) which are periodically arranged are printed on the upper surface of the second medium substrate (31), second circular metal patches (312) are printed at the junction positions of every four first circular metal patches (311) to form an array comprising R multiplied by S second circular metal patches (312), wherein P is less than or equal to M, Q is less than or equal to N, R is less than or equal to P-1, and S is less than or equal to Q-1; the first circular metal patch (311) and the second circular metal patch (312) are respectively etched with a rectangular notch at two intersection points of any diameter and circumference for realizing double-frequency double-circular polarization radiation characteristics, C-shaped gaps are respectively etched at the center positions of the first circular metal patch (311) and the second circular metal patch (312), and the C-shaped gaps on the first circular metal patch (311) are perpendicular to the opening directions of the C-shaped gaps on the second circular metal patch (312); the lower surface of the second dielectric substrate (31) is printed with a second metal floor (313), and the corresponding positions of the second metal floor (313) and the first circular metal patch (311) and the second circular metal patch (312) are etched with wave leakage gaps (3131); a third circular metal patch (321) is printed on the lower surface of the third medium substrate (32) at the projection position of each first circular metal patch (311), a fourth circular metal patch (322) is printed on the projection position of each second circular metal patch (312), C-shaped gaps are etched at the center positions of the third circular metal patch (321) and the fourth circular metal patch (322), and the opening directions of the C-shaped gaps on the third circular metal patch (321) and the C-shaped gaps on the fourth circular metal patch (322) are the same; the first circular metal patch (311) is connected with a third circular metal patch (321) at the corresponding position of the first circular metal patch, and the second circular metal patch (312) is connected with a fourth circular metal patch (322) at the corresponding position of the second circular metal patch through a metallized via hole (33) penetrating through a leaky wave slot (3131);
the center hollowed-out position of the main reflector (1) is fixedly provided with a feed source (4), and the phase center of the feed source (4) coincides with the center position of the main reflector (1).
2. The dual-frequency dual-circularly polarized folded array antenna of claim 1, wherein: the main reflector (1) coincides with the center normal of the auxiliary transmission mirror (3).
3. The dual-frequency dual-circularly polarized folded array antenna of claim 1, wherein: the calculation formula of the phase compensation value phi P (x, y) of the position of the square annular metal patch (111) with the double openings is as follows:
Where k is the wavenumber in free space, f is the focal length of the primary mirror (1), and Φ 0 is an arbitrary constant phase value.
4. The dual-frequency dual-circularly polarized folded array antenna of claim 1, wherein: the specification of the first circular metal patch (311) is the same as that of the third circular metal patch (321), the C-shaped slit specifications etched on the first circular metal patch (311) and the third circular metal patch (321) are the same, and the center normals of the first circular metal patch (311) and the third circular metal patch (321) are overlapped; the specification of the second circular metal patch (312) is the same as that of the fourth circular metal patch (322), the C-shaped slit specifications etched on the second circular metal patch (312) and the fourth circular metal patch (322) are the same, and the center normals of the second circular metal patch (312) and the fourth circular metal patch (322) are coincident.
5. The dual-frequency dual-circularly polarized folded array antenna of claim 1, wherein: the feed source (4) adopts a rectangular horn antenna structure.
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| CN114725695B (en) * | 2022-04-08 | 2024-05-24 | 重庆邮电大学 | Ultra-thin all-metal dual-frequency transmission and reflection integrated array antenna unit |
| CN114824834B (en) * | 2022-06-29 | 2022-10-14 | 电子科技大学 | Fully-integrated large-frequency-ratio double-frequency double-fed folded reflective array antenna |
| CN115377699B (en) * | 2022-09-15 | 2023-06-16 | 南京理工大学 | Low profile transmissive array antenna based on polarization torsion unit |
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