A dual-band dual-circularly polarized common-aperture filtered antenna

Abstract

The present invention discloses a dual-frequency dual-circularly polarized common-aperture filtering antenna, comprising: a dielectric resonator, a nested dual-ring metal patch structure, a rectangular strip metal structure, a magnetoelectric dipole radiation structure, a probe structure, a single-ring metal patch structure, an antenna metal floor, a one-to-two unequal-phase power divider, a first dielectric plate, a second dielectric plate, a third dielectric plate, a fourth dielectric plate, a fifth dielectric plate, and an orthogonal L-shaped probe structure. The present invention solves the mutual coupling problem between different-frequency circularly polarized common-aperture antennas and improves the isolation between channels.

Description

Technical Field

[0001] The present invention belongs to the technical field of antennas, and in particular relates to a dual-band dual-circularly polarized common-aperture filtering antenna. Background Art

[0002] Dual-band common-aperture antennas can meet the radiation requirements of two different frequency bands within the same aperture plane. When applied to spaceborne phased array antennas, they can greatly reduce the space requirements of the antenna for the payload platform and improve its space utilization rate. However, for dual-band common-aperture antennas with a small frequency ratio, the antenna structures operating in different frequency bands will be highly concentrated in physical space. In a compact space, the mutual coupling effect between different frequency bands will become obvious, specifically manifested as a decrease in the isolation between different frequency band ports of the antenna and radiation distortion, resulting in a decline in the performance of the antenna system. In addition, the currently reported dual-band common-aperture antennas mainly adopt the polarization form of linear polarization, which cannot meet the requirements of spaceborne communication antennas for circular polarization radiation. Summary of the Invention

[0003] The technical problem solved by the present invention is: overcoming the deficiencies of the prior art, providing a dual-band dual-circularly polarized common-aperture filtering antenna, solving the mutual coupling problem between different-frequency circularly polarized common-aperture antennas, and improving the isolation between channels.

[0004] The object of the present invention is achieved through the following technical solutions: A dual-band dual-circularly polarized common-aperture filtering antenna, comprising: a dielectric resonator, a nested dual-ring metal patch structure, a rectangular strip metal structure, a magnetoelectric dipole radiation structure, a probe structure, a single-ring metal patch structure, an antenna metal floor, a one-to-two unequal-phase power divider, a first dielectric plate, a second dielectric plate, a third dielectric plate, a fourth dielectric plate, a fifth dielectric plate, and an orthogonal L-shaped probe structure; wherein, the dielectric resonator is arranged on the upper surface of the dielectric plate; the first dielectric plate, the second dielectric plate, the third dielectric plate, the fourth dielectric plate, and the fifth dielectric plate are connected in sequence from top to bottom; the nested dual-ring metal patch structure is arranged on the upper surface of the first dielectric plate and the upper surface of the second dielectric plate; the probe structure sequentially passes through the fifth dielectric plate, the fourth dielectric plate, the third dielectric plate, the second dielectric plate, and the first dielectric plate from bottom to top; the rectangular strip metal structure is arranged on the upper surface of the second dielectric plate; the magnetoelectric dipole radiation structure is arranged on the upper surface of the third dielectric plate, and the magnetoelectric dipole radiation structure is connected to the antenna metal floor; the orthogonal L-shaped probe structure is arranged on the upper surface of the third dielectric plate, and the orthogonal L-shaped probe structure is connected to the one-to-two unequal-phase power divider; the single-ring metal patch structure is arranged on the upper surface of the fourth dielectric plate, and the single-ring metal patch structure is located below the orthogonal L-shaped probe structure; the antenna metal floor is arranged on the upper surface of the fifth dielectric plate; the one-to-two unequal-phase power divider is arranged on the lower surface of the fifth dielectric plate.

[0005] In the above-mentioned dual-band dual-circularly polarized common-aperture filter antenna, the dielectric resonator is in a cylindrical structure, and two symmetrical through-gaps are provided on the dielectric resonator.

[0006] In the above-mentioned dual-band dual-circularly polarized common-aperture filter antenna, the nested dual-ring metal patch structure includes a first metal ring, a second metal ring and a metal arc; wherein, the first metal ring and the metal arc are both arranged on the upper surface of the first dielectric plate; the second metal ring is arranged on the upper surface of the second dielectric plate, and the second metal ring is located below the first metal ring; the first metal ring is connected to the metal arc; both the first metal ring and the second metal ring are connected to the probe structure through metal microstrip lines.

[0007] In the above-mentioned dual-band dual-circularly polarized common-aperture filter antenna, the magnetoelectric dipole radiation structure includes four metal patches; wherein, the four metal patches are symmetric about the geometric center of the antenna; the sizes of the four metal patches are the same; each metal patch is connected to the antenna metal floor through a shorting via.

[0008] In the above-mentioned dual-band dual-circularly polarized common-aperture filter antenna, the shorting via is a metallized via and is located at the inner corner position of the metal patch.

[0009] In the above-mentioned dual-band dual-circularly polarized common-aperture filter antenna, the probes of the orthogonal L-shaped probe structure sequentially penetrate through the third dielectric plate, the fourth dielectric plate, the fifth dielectric plate and are connected to a one-to-two unequal-phase power divider.

[0010] In the above-mentioned dual-band dual-circularly polarized common-aperture filter antenna, the projection of the orthogonal L-shaped probe structure on the upper surface of the fourth dielectric plate is located inside the single-ring metal patch structure.

[0011] In the above-mentioned dual-band dual-circularly polarized common-aperture filter antenna, the dielectric resonator satisfies the following constraint conditions:

[0012]

[0013] where f L is the operating frequency of the dielectric resonator, c0 is the speed of light in free space, h is the height of the dielectric resonator, r is the radius of the dielectric resonator, and ε1 is the dielectric constant of the dielectric resonator.

[0014] In the above-mentioned dual-band dual-circularly polarized common-aperture filter antenna, the magnetoelectric dipole radiation structure satisfies the following constraint conditions:

[0015]

[0016] where λ His the operating wavelength of the magnetoelectric dipole, a is the length or width of the metal patch, w is the gap width between adjacent metal patches, and ε2 is the dielectric constant of the fourth dielectric plate.

[0017] In the above dual-band dual-circularly polarized common-aperture filtering antenna, the metal patch is square.

[0018] The present invention has the following beneficial effects compared with the prior art:

[0019] (1) Compared with the traditional dual-circularly polarized common-aperture antenna, by loading the arc-shaped and ring-shaped filtering structures on the high- and low-frequency radiation structures of the antenna, the present invention realizes the low-pass operating mode in the low-frequency band and the high-pass operating mode in the high-frequency band of the antenna, and improves the isolation between the high- and low-frequency ports;

[0020] (2) Compared with the traditional dual-band dual-circularly polarized common-aperture antenna, the present invention adopts the stacking method of the dielectric resonator and the magnetoelectric dipole. Since the dielectric resonator is used as the low-frequency radiation structure and placed directly above the high-frequency radiator, and the dielectric resonator can be regarded as an electromagnetic transparent structure of the high-frequency radiator, the problem of mutual interference between high- and low-frequency radiations is solved;

[0021] (3) The low-frequency feeding structure of the present invention can not only be used to excite the low-frequency resonant structure, but also be reused as the filtering structure of the high-frequency resonant structure to suppress the radiation of the high-frequency resonant structure at low frequencies, thereby further improving the isolation between different polarization ports in different frequency bands. Description of the Drawings

[0022] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0023] Figure 1 is a schematic structural diagram of the dual-band dual-circularly polarized common-aperture filtering antenna provided by the embodiment of the present invention;

[0024] Figure 2 is a side view of the dual-band dual-circularly polarized common-aperture filtering antenna provided by the embodiment of the present invention;

[0025] Figure 3 is a top view of the dual-band dual-circularly polarized common-aperture filtering antenna provided by the embodiment of the present invention;

[0026] Figure 4 is a schematic diagram of the filtering performance and impedance characteristics of the dual-band dual-circularly polarized common-aperture filtering antenna provided by the embodiment of the present invention when operating at low frequencies;

[0027] Figure 5It is a schematic diagram of the filtering performance and impedance characteristics of the dual-band dual-circularly polarized co-aperture filtering antenna provided by the embodiments of the present invention when operating at high frequencies. Detailed implementation manners

[0028] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] To meet the design requirements of the spaceborne dual-band dual-circularly polarized co-aperture antenna, while ensuring the radiation performance of the antenna, a high isolation degree between different-frequency antenna channels is achieved. Based on the design concepts of circularly polarized filtering antennas and electromagnetic transparent antennas, by adopting the stacking method of dielectric resonators and microstrip printed antennas, and combining filtering structures, a dual-band dual-circularly polarized radiation characteristic with high port isolation and non-interference between high- and low-frequency radiation characteristics is realized.

[0030] Figure 1 It is a schematic structural diagram of the dual-band dual-circularly polarized co-aperture filtering antenna provided by the embodiments of the present invention; Figure 2 It is a side view of the dual-band dual-circularly polarized co-aperture filtering antenna provided by the embodiments of the present invention; Figure 3 It is a top view of the dual-band dual-circularly polarized co-aperture filtering antenna provided by the embodiments of the present invention. As Figures 1 to 3 shown, the dual-band dual-circularly polarized co-aperture filtering antenna includes: a dielectric resonator 1, a nested double-ring metal patch structure 5, a rectangular strip metal structure 6, a magnetoelectric dipole radiation structure 7, a probe structure 8, a single-ring metal patch structure 9, an antenna metal floor 10, a one-to-two unequal-phase power divider 11, a first dielectric plate 12, a second dielectric plate 13, a third dielectric plate 14, a fourth dielectric plate 15, a fifth dielectric plate 16, and an orthogonal L-shaped probe structure 17. Among them,

[0031] The dielectric resonator 1 is disposed on the upper surface of the dielectric plate 12; the first dielectric plate 12, the second dielectric plate 13, the third dielectric plate 14, the fourth dielectric plate 15 and the fifth dielectric plate 16 are connected in sequence from top to bottom; the nested double-ring metal patch structure 5 is disposed on the upper surfaces of the first dielectric plate 12 and the second dielectric plate 13; the probe structure 8 sequentially passes through the fifth dielectric plate 16, the fourth dielectric plate 15, the third dielectric plate 14, the second dielectric plate 13 and the first dielectric plate 12 from bottom to top; the rectangular strip metal structure 6 is disposed on the upper surface of the second dielectric plate 13; the magnetoelectric dipole radiation structure 7 is disposed on the upper surface of the third dielectric plate 14, and the magnetoelectric dipole radiation structure 7 is connected to the antenna metal floor 10; the orthogonal L-shaped probe structure 17 is disposed on the upper surface of the third dielectric plate 14, and the orthogonal L-shaped probe structure 17 is connected to the one-to-two unequal-phase power divider 11; the single-ring metal patch structure 9 is disposed on the upper surface of the fourth dielectric plate 15, and the single-ring metal patch structure 9 is located below the orthogonal L-shaped probe structure 17; the antenna metal floor 10 is disposed on the upper surface of the fifth dielectric plate 16; the one-to-two unequal-phase power divider 11 is disposed on the lower surface of the fifth dielectric plate 16.

[0032] Specifically, the dielectric resonator 1 is a cylinder structure placed above the dielectric plate 12 and is the low-frequency radiation structure of the antenna. The dielectric resonator 1 has two symmetric notches that penetrate through.

[0033] The first dielectric plate 12, the second dielectric plate 13, the third dielectric plate 14, the fourth dielectric plate 15 and the fifth dielectric plate 16 are closely arranged in sequence from top to bottom, and their cross-sections are all squares with the same size.

[0034] The nested double-ring metal patch structure 5 includes a first metal ring 2, a second metal ring 3 and a metal arc 4; wherein, the first metal ring 2 and the metal arc 4 are both disposed on the upper surface of the first dielectric plate 12; the second metal ring 3 is disposed on the upper surface of the second dielectric plate 13, and the second metal ring 3 is located below the first metal ring 2; the first metal ring 2 and the metal arc 4 are connected; the first metal ring 2 and the second metal ring 3 are both connected to the probe structure 8 through metal microstrip lines.

[0035] Specifically, for the dielectric resonator 1, the corresponding feeding structures are the nested double-ring metal patch structure 5 and the rectangular strip metal structure 6. The nested double-ring metal patch structure 5 is composed of a metal ring 2, a metal ring 3 and a metal arc 4. The metal ring 2 and the metal arc 4 are located on the upper surface of the dielectric plate 12; the metal ring 3 is located directly below the metal ring 2 and is placed on the upper surface of the dielectric plate 13; the center of the metal ring 2 and the metal arc 4 are connected by a metal microstrip line; the rectangular strip metal structure 6 is on the same layer as the metal ring 3, and the metal ring 2 and the metal ring 3 are both connected to the probe structure 8 through metal microstrip lines.

[0036] The magnetoelectric dipole radiation structure 7 is located on the upper surface of the dielectric plate 14 and consists of four rectangular metal patches with both length and width of a. The gap width between adjacent rectangular metal patches is w. The four metal patches are symmetric about the geometric center of the antenna. Each metal patch passes through the dielectric plates 14 and 15 through a short - circuit via hole and is connected to the antenna metal floor 10. Among them, each short - circuit via hole is a metallized via hole and is close to the inner corner of the rectangular metal patch. The orthogonal L - shaped probe structure 17 is on the same layer as the magnetoelectric dipole radiation structure 7, and its probe penetrates through the dielectric plates 14, 15, and 16 and is connected to a one - to - two unequal - phase power divider 11. The magnetoelectric dipole radiation structure 7, four short - circuit via holes, the orthogonal L - shaped probe structure 17, and the one - to - two unequal - phase power divider 11 together form the high - frequency radiator of the antenna.

[0037] The single - ring - shaped metal patch structure 9 is located on the upper surface of the dielectric plate 15 and is directly below the magnetoelectric dipole radiation structure 7, surrounding the orthogonal L - shaped probe structure 17 in the middle. Specifically, the projection of the orthogonal L - shaped probe structure 17 on the upper surface of the fourth dielectric plate 15 is inside the single - ring - shaped metal patch structure 9. The antenna metal floor 10 is the common ground plane for the high - and low - frequency radiation structures of the antenna.

[0038] The dielectric resonator 1 needs to satisfy the following constraint conditions:

[0039]

[0040] The magnetoelectric dipole radiation structure 7 needs to satisfy the following constraint conditions:

[0041] I(z)=I m (β((2a + w) / 2-|z|)), -(2a + w) / 2 < z < (2a + w) / 2 and I(z)=0

[0042] Then there is:

[0043] Among them, c0 is the speed of light in free space, h is the height of the dielectric resonator, r is the radius of the dielectric resonator, ε1 is the dielectric constant of the dielectric resonator, f L is the operating frequency of the dielectric resonator, λ H is the operating wavelength of the magnetoelectric dipole, a is the length or width of the rectangular metal patch constituting the magnetoelectric dipole radiation structure, w is the gap width between adjacent rectangular metal patches. ε2 is the dielectric constant of the third dielectric plate 14 or the fourth dielectric plate 15, and the dielectric constants of the third dielectric plate 14 and the fourth dielectric plate 15 are equal.

[0044] Through the above formulas, the dual - frequency radiation performance of the antenna is good.

[0045] A preferred example of the present invention is a dual - band dual - circular - polarization co - aperture filtering antenna operating in the millimeter - wave band. The high - frequency center frequency is set at 30 GHz, and the low - frequency center frequency is set at 20 GHz. The dielectric resonator 1 is a low - frequency radiation structure, and its operating mode is the HEN 11ξ mode.

[0046] The parameters of the dual - band dual - circular - polarization co - aperture filtering antenna are determined as follows:

[0047] First, according to the operating frequency requirements of the antenna in the low - frequency band, the radius r, height h, and dielectric constant ε1 of the dielectric resonator structure are determined according to the following constraints:

[0048]

[0049] where c0 is the speed of light in free space, h is the height of the dielectric resonator, r is the radius of the dielectric resonator, ε1 is the dielectric constant of the dielectric resonator, and f L is the operating frequency of the dielectric resonator.

[0050] Then, the feeding structure of the antenna in the low - frequency operating mode is designed. Its operating frequency is 20 GHz. The outer radius of the metal ring 2 is r_1, and the width is w_1; the metal ring 3 is located directly below the metal ring 2, its outer radius is r_2, and the width is w_2. The specific parameters need to be adjusted according to the actual impedance matching of the antenna; the metal arc 4 is connected to the metal ring 2 to introduce an edge - steep zero point with adjustable upper - band characteristics. Its outer radius is r_3, the width is w_3, and the corresponding radian angle is θ. The specific parameters need to be adjusted according to the actual low - frequency filtering of the antenna. The length of the rectangular strip - shaped metal structure 6 is l_p, the width is w_p, and its counter - clockwise rotation angle is α. It is on the same layer as the metal ring 2. The specific parameter values need to be determined according to the left - hand circular - polarization radiation performance of the antenna. In addition, the length of the two symmetric notches on the dielectric resonator 1 is l_m, the width is w_m, and the height is h. The specific parameter values also need to be determined according to the left - hand circular - polarization radiation performance of the antenna.

[0051] Subsequently, the high - frequency operating mode of the antenna is designed. The magnetoelectric dipole radiation structure 7 is composed of four rectangular metal patches with both length and width of a. The gap width between adjacent rectangular metal patches is w, satisfying the relational expression. Where λ H is the operating wavelength of the magnetoelectric dipole, and ε2 is the dielectric constant of the dielectric plates 15 and 14. The length of the arm of the L - shaped probe 17 is l_f, the width is w_f, the distance from the probe feeding point to the center point of the antenna is l_feed, and the rear end is connected to a one - to - two unequal - phase power divider 11. The specific parameters need to be adjusted according to the actual impedance matching of the antenna during high - frequency operation.

[0052] Finally, the filtering characteristics of the antenna operating in the high-frequency band are designed and realized by the single-ring-shaped metal patch structure 9, whose outer radius is r_0 and width is w_0. The specific parameters need to be adjusted according to the actual situation of the high-frequency filtering of the antenna.

[0053] Figure 4 The gain curve and S-parameter curve of the antenna of the present invention operating at low frequency are given. Figure 5 The gain curve and S-parameter curve of the antenna of the present invention operating at high frequency are given.

[0054] This embodiment solves the mutual coupling problem between the different-frequency circularly polarized co-aperture antennas and improves the isolation between channels. The characteristics of the antenna structure are that the high-low frequency resonant structure stacking method is adopted, and the high-frequency resonant structure is placed below the low-frequency resonant structure. The high-frequency resonant structure is in the form of a magnetoelectric dipole antenna fed by a pair of orthogonal L-shaped probes. By loading a 1-to-2 unequal-phase power divider 11 with a phase difference of 90° at the back end of the antenna, the circular polarization radiation performance is realized. Based on this, by introducing a single-ring-shaped metal patch structure 9 below the magnetoelectric dipole radiation structure 7, a zero point with a steep edge is generated in the lower frequency band of the gain of the antenna when operating at high frequency. The low-frequency resonant structure is a cylindrical dielectric resonator 1 and is excited by a nested double-ring metal patch structure 5 and a rectangular strip metal structure 6. The nested double-ring metal patch structure 5 can be used to realize a zero point with a steep edge at the upper frequency band gain of the low-frequency resonant structure. In addition, to further improve the low-frequency circular polarization characteristics, the dielectric resonator 1 has two symmetrical through gaps. Compared with the prior art and the traditional dual circularly polarized co-aperture antenna, by introducing a three-layer nested ring structure, the isolation between the different-frequency and different-polarization ports in the millimeter wave band is improved. At the same time, as the low-frequency resonant structure of the antenna, the dielectric resonator can not only realize the right-handed circular polarization radiation characteristics in the low-frequency band, but also for the high-frequency resonant structure of the antenna, the dielectric resonator can be regarded as an electromagnetic transparent structure and will not affect the high-frequency radiation characteristics.

[0055] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A dual - frequency and dual - circular - polarization co - aperture filtering antenna, characterized in that Comprising: A dielectric resonator (1), a nested double-ring metal patch structure (5), a rectangular strip metal structure (6), a magnetoelectric dipole radiation structure (7), a probe structure (8), a single-ring metal patch structure (9), an antenna metal floor (10), a one-to-two unequal-phase power divider (11), a first dielectric plate (12), a second dielectric plate (13), a third dielectric plate (14), a fourth dielectric plate (15), a fifth dielectric plate (16), and an orthogonal L-shaped probe structure (17); wherein, The dielectric resonator (1) is disposed on the upper surface of the dielectric plate (12); The first dielectric plate (12), the second dielectric plate (13), the third dielectric plate (14), the fourth dielectric plate (15), and the fifth dielectric plate (16) are sequentially connected from top to bottom; The nested double-ring metal patch structure (5) is disposed on the upper surfaces of the first dielectric plate (12) and the second dielectric plate (13); The probe structure (8) sequentially passes through the fifth dielectric plate (16), the fourth dielectric plate (15), the third dielectric plate (14), the second dielectric plate (13), and the first dielectric plate (12) from bottom to top; The rectangular strip metal structure (6) is disposed on the upper surface of the second dielectric plate (13); The magnetoelectric dipole radiation structure (7) is disposed on the upper surface of the third dielectric plate (14), and the magnetoelectric dipole radiation structure (7) is connected to the antenna metal floor (10); The orthogonal L-shaped probe structure (17) is disposed on the upper surface of the third dielectric plate (14), and the orthogonal L-shaped probe structure (17) is connected to the one-to-two unequal-phase power divider (11); The single-ring metal patch structure (9) is disposed on the upper surface of the fourth dielectric plate (15), and the single-ring metal patch structure (9) is located below the orthogonal L-shaped probe structure (17); The antenna metal floor (10) is disposed on the upper surface of the fifth dielectric plate (16); The one-to-two unequal-phase power divider (11) is disposed on the lower surface of the fifth dielectric plate (16).

2. The dual-band dual-circularly polarized co-aperture filtering antenna according to claim 1, wherein: The dielectric resonator (1) is a cylinder structure, and the dielectric resonator (1) is provided with two symmetric through holes.

3. The dual-band dual-circularly polarized co-aperture filtering antenna according to claim 1, wherein: The nested double-ring metal patch structure (5) includes a first metal ring (2), a second metal ring (3), and a metal arc (4); wherein, Both the first metal ring (2) and the metal arc (4) are disposed on the upper surface of the first dielectric plate (12); The second metal ring (3) is disposed on the upper surface of the second dielectric plate (13), and the second metal ring (3) is located below the first metal ring (2); The first metal ring (2) and the metal arc (4) are connected; Both the first metal ring (2) and the second metal ring (3) are connected to the probe structure (8) through metal microstrip lines.

4. The dual-band dual-circularly polarized co-aperture filter antenna according to claim 1, wherein: The magnetoelectric dipole radiation structure (7) includes four metal patches; wherein, The four metal patches are symmetric about the geometric center of the antenna; The four metal patches have the same size; Each metal patch is connected to the antenna metal floor (10) through a short-circuit via hole.

5. The dual-band dual-circularly polarized co-aperture filtering antenna according to claim 4, wherein: The short - circuit via - hole is a metallized via - hole and is located at the inner - corner position of the metal patch.

6. The dual-band dual-circularly polarized common-aperture filtering antenna according to claim 1, wherein: The probes of the orthogonal L - shaped probe structure (17) sequentially penetrate through the third dielectric substrate (14), the fourth dielectric substrate (15), the fifth dielectric substrate (16) and are connected to a one - to - two unequal - phase power divider (11).

7. The dual-band dual-circularly polarized co-aperture filtering antenna according to claim 1, wherein: The projection of the orthogonal L - shaped probe structure (17) on the upper surface of the fourth dielectric substrate (15) is located inside the single - ring metal patch structure (9).

8. The dual-band dual-circularly polarized common-aperture filtering antenna according to claim 1, wherein: The dielectric resonator (1) satisfies the following constraint conditions: where f L is the operating frequency of the dielectric resonator, c0 is the speed of light in free space, h is the height of the dielectric resonator, r is the radius of the dielectric resonator, and ε1 is the dielectric constant of the dielectric resonator.

9. The dual-band dual-circularly polarized co-aperture filter antenna according to claim 4, wherein: The magnetoelectric dipole radiation structure (7) satisfies the following constraint conditions: where λ H is the operating wavelength of the magnetoelectric dipole, a is the length or width of the metal patch, w is the gap width between adjacent metal patches, and ε2 is the dielectric constant of the fourth dielectric plate (15).

10. The dual-band dual-circularly polarized co-aperture filtering antenna according to claim 4, wherein: The metal patch is square.

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