A dual circularly polarized beam independently controllable wideband magneto-electric dipole reflectarray antenna

Abstract

The application discloses a kind of wideband magnetoelectric dipole reflectarray antennas of double circular polarization beam independent controllable, and relate to antenna technical field;The reflectarray antenna, including planar reflectarray and X wave band wideband double circular polarization plane feed source, X wave band wideband double circular polarization plane feed source is placed at the focal plane of planar reflectarray, and 20 ° is rotated along X axis;Planar reflectarray includes X wave band magnetoelectric dipole reflection unit, X wave band magnetoelectric dipole reflection unit is equipped with n×n, X wave band magnetoelectric dipole reflection unit is arranged into n×n array and forms planar reflectarray, 10≤n≤40;The application can realize independent regulation and control to double circular polarization reflection phase in X wave band by the synergic control of transmission phase and geometric phase, can reach independent control to corresponding beam direction, and this kind of reflectarray antenna has the advantages of beam independent control, high gain, wide bandwidth, simple structure and the like, and has wide application prospect in satellite communication and the like fields.

Description

Technical Field

[0001] This invention belongs to the field of antenna technology, and particularly relates to a broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams. Background Technology

[0002] The rapid development of satellite communications, aerospace, and remote sensing has placed higher demands on antenna performance. Traditional parabolic antennas and planar phased array antennas have some inherent drawbacks, making them increasingly unable to meet people's needs. To overcome the shortcomings of parabolic antennas and planar phased array antennas, planar reflector array antennas have emerged. Their planar structure, simple design, high resolution, and low manufacturing cost make them suitable for application in multiple fields such as satellite communications, aerospace, and remote sensing, and they have good practical application value.

[0003] Traditional magnetoelectric dipole antennas primarily operate in a single-polarization state, while reflective antennas operating in a dual-circular polarization state with independently controllable beam characteristics are relatively rare. Dual-circular polarization independently controllable beam antennas can simultaneously receive or transmit electromagnetic waves from different directions, while also possessing the anti-interference performance of circularly polarized antennas, resisting multipath effects, and improving system sensitivity. Therefore, dual-circular polarization independently controllable beam magnetoelectric dipole reflective array antennas with broadband and high-gain characteristics are of significant research importance.

[0004] Because modern PCB manufacturing processes are highly mature, processing precision is well-assured even at relatively low frequency bands. Furthermore, the manufactured products can possess characteristics such as low profile, small size, and high integration, which is beneficial for the large-scale production and application of antennas. Therefore, broadband dual-circularly polarized beam independently controllable reflective array antennas using PCB technology have significant practical implications in terms of bandwidth, high gain, and cost reduction. Summary of the Invention

[0005] The purpose of this invention is to provide a broadband magnetoelectric dipole reflector antenna with independently controllable dual circular polarization beams, in order to solve the problem mentioned in the background art that traditional magnetoelectric dipole antennas mainly operate in a single polarization state, while there are few reflector antennas that operate in a dual circular polarization state and have independently controllable beams.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] A broadband magnetoelectric dipole reflector array antenna with independently controllable dual circular polarized beams includes a planar reflector array and an X-band broadband dual circular polarized planar feed. The X-band broadband dual circular polarized planar feed is placed at the focal plane of the planar reflector array and rotated 20° along the X-axis to reduce the blocking effect on the reflected waves.

[0008] The planar reflection array includes X-band magnetoelectric dipole reflection units, and there are n×n X-band magnetoelectric dipole reflection units arranged in an n×n array to form a planar reflection array.

[0009] 10≤n≤40, and n×n is preferably 16×16, 20×20, 25×25, etc.

[0010] The array size can be expanded to other scales as needed. The array size is set according to the gain requirements. When the array size is relatively small, n = 10 or 12. When the array size is relatively large, n = 30 or 40.

[0011] The X-band magnetoelectric dipole reflecting unit has 16 left / right circular polarization reflection phase states to form a planar reflecting array, realizing independent control of 2-bit left-hand circular polarization and 2-bit right-hand circular polarization reflected wave phases. That is, a 2-bit × 2-bit reflection unit forms 16 left / right circular polarization reflection phase states, including: L0° / R0°, L0° / R90°, L0° / R180°, L0° / R270°; L90° / R0°, L90° / R90°, L90° / R180°, L90° / R270°; L180° / R0°, L180° / R90°, L180° / R180°, L180° / R270°; L270° / R0°, L270° / R90°, L270° / R180°, L270° / R270° (Note: L0° / R90° represents a left circular polarization reflection phase of 0° and a right circular polarization reflection phase of 90°).

[0012] Preferably, the X-band magnetoelectric dipole reflecting unit includes a circular magnetoelectric dipole, a first dielectric substrate, and a second dielectric substrate;

[0013] A reflective unit metal grounding layer is provided between the first dielectric substrate and the second dielectric substrate. The reflective unit metal grounding layer is engraved with a cross-shaped slit. A reflective unit microstrip line layer is provided on the lower surface of the second dielectric substrate.

[0014] The circular magnetoelectric dipole serves as a radiator, located above the metal grounding layer of the reflector unit, and is distributed in four quadrants corresponding to the cross-shaped slots.

[0015] Preferably, the microstrip line layer of the reflective unit includes a first microstrip transmission line and a second microstrip transmission line;

[0016] The first microstrip transmission line and the second microstrip transmission line each have two segments, and the two segments of the first microstrip transmission line and the two segments of the second microstrip transmission line are arranged in a cross pattern.

[0017] The transmission phase is controlled by adjusting the lengths of the first and second microstrip transmission lines. At the same time, the reflection phases corresponding to the two segments of the first and second microstrip transmission lines are always 180° apart to ensure that the circular polarization directions of the incident and reflected waves are consistent. Thus, the X-band magnetoelectric dipole reflecting unit controls the geometric phase of the reflected wave by rotating itself.

[0018] Preferably, the circular magnetoelectric dipole, the cross-shaped slit, the first microstrip transmission line, and the second microstrip transmission line of each X-band magnetoelectric dipole reflecting unit in the planar reflection array have the same rotation angle.

[0019] Preferably, the X-band magnetoelectric dipole reflecting unit with 16 left / right circular polarization reflection phase states can achieve decoupling of the left / right circular polarization reflected wave phase by coordinating the lengths of the first and second microstrip transmission lines in the X-band magnetoelectric dipole reflecting unit and the rotation angle of the entire X-band magnetoelectric dipole reflecting unit, thereby achieving independent control of the dual circular polarization beam.

[0020] Preferably, the X-band broadband dual circular polarized planar feed includes feed antenna elements, and there are 2×2 feed antenna elements arranged in a 2×2 array.

[0021] Preferably, the feed antenna unit includes a square magnetoelectric dipole, two layers of feed antenna unit metal grounding layer and two layers of dielectric substrate;

[0022] The two-layer dielectric substrate includes an upper dielectric substrate and a lower dielectric substrate, and the two-layer feed antenna unit metal ground layer is located between the upper dielectric substrate and the lower dielectric substrate; the two-layer feed antenna unit metal ground layer is engraved with coupling gaps;

[0023] The square magnetoelectric dipoles are located above the metal grounding layer of the two-layer feed antenna unit and are equidistantly arranged. The square magnetoelectric dipoles are distributed in four quadrants corresponding to the coupling gaps.

[0024] The lower surface of the lower dielectric substrate is provided with a feed antenna unit microstrip line layer. The lower dielectric substrate is connected to a feeding mechanism through the feed antenna unit microstrip line layer. The feeding mechanism is used to feed the feed antenna unit.

[0025] Preferably, both the square magnetoelectric dipole and the circular magnetoelectric dipole include a patch and a metal via.

[0026] The circular magnetoelectric dipole has arc-shaped patches, and four arc-shaped patches can form a complete circle.

[0027] The patch in the square magnetoelectric dipole is a square patch.

[0028] Preferably, the microstrip line layer of the feed antenna unit includes two orthogonal U-shaped microstrip lines, and a bridge structure is adopted at the junction of the two orthogonal U-shaped microstrip lines.

[0029] The feed antenna unit is provided with two orthogonal feed ports, which feed the coupling slot through orthogonal U-shaped microstrip lines.

[0030] Preferably, the feeding mechanism includes six equal amplitude and equal phase power dividers and a 3dB directional coupler. The 3dB directional coupler is connected to the input terminals of the two equal amplitude and equal phase power dividers. Each of the four feed antenna elements is provided with two orthogonal feed ports, which are connected to the output terminals of the cascaded equal amplitude and equal phase power dividers.

[0031] Preferably, both the X-band magnetoelectric dipole reflecting unit and the feed antenna unit include a metal base plate layer, which is located below the second dielectric substrate or the lower dielectric substrate.

[0032] An air layer is provided between the second dielectric substrate or the lower dielectric substrate and the metal base layer.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] (1) The reflective array antenna in this invention is composed of a planar reflective array and an X-band broadband dual-circular polarization planar feed source. It has structural advantages such as simple structure and easy processing, and can realize the functions of dual-circular polarization, wide bandwidth, high gain, low axial ratio, and independent control of dual-circular polarization beam.

[0035] (2) The X-band magnetoelectric dipole reflecting unit with 16 left / right circular polarization reflection phase states in this invention achieves decoupling of left and right circular polarization wave phases in the X-band by changing the lengths of the first and second microstrip transmission lines in the X-band magnetoelectric dipole reflecting unit and the coordinated control of rotating the entire X-band magnetoelectric dipole reflecting unit, that is, by the coordinated control of transmission phase and geometric phase, independent control of the direction of the dual circular polarization beam is achieved in the X-band.

[0036] (3) Due to the use of a magnetoelectric dipole structure, the reflective array antenna of this invention has broadband characteristics, and the generated independently pointing dual circularly polarized beam has a wide gain bandwidth and axial ratio bandwidth.

[0037] (4) The array antenna in this invention is mainly composed of a circular magnetoelectric dipole and a microstrip line layer. The entire structure can be fabricated using traditional PCB or LTCC processes and 3D printing technology. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of a broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams in this invention.

[0039] Figure 2 This is a schematic diagram of the structure of the X-band magnetoelectric dipole reflector unit in this invention;

[0040] Figure 3 This is a schematic diagram of the structure of the X-band broadband dual circular polarization planar feed source in this invention;

[0041] Figure 4 This is a schematic diagram of the structure of the feed antenna unit in this invention;

[0042] Figure 5 This is a schematic diagram of the power feeding mechanism in this invention;

[0043] Figure 6 This is a schematic diagram of 16 left / right circular polarization reflection phase states of the X-band magnetoelectric dipole reflection unit in this invention.

[0044] Figure 7 This is a schematic diagram of phase compensation for the left-hand circularly polarized wave of a broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams, as described in this invention.

[0045] Figure 8 This is a schematic diagram of phase compensation for the right-hand circularly polarized wave of a broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams, as described in this invention.

[0046] Figure 9 This is a simulated far-field normalized radiation pattern at a frequency of 9.5 GHz for a broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams in this invention, when excited by a left-hand circularly polarized wave emitted by a feed antenna element.

[0047] Figure 10 This is a simulated far-field normalized radiation pattern at a frequency of 10.5 GHz for a broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams in this invention, when excited by a left-hand circularly polarized wave emitted by a feed antenna element.

[0048] Figure 11 This is a simulated far-field normalized radiation pattern at a frequency of 11.5 GHz for a broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams in this invention, when excited by a left-hand circularly polarized wave emitted by a feed antenna element.

[0049] Figure 12 This is a simulated far-field normalized radiation pattern at a frequency of 9.5 GHz for a broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams in this invention, when excited by a right-hand circularly polarized wave emitted by a feed antenna element.

[0050] Figure 13 This is a simulated far-field normalized radiation pattern at a frequency of 10.5 GHz for a broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams in this invention, when excited by a right-hand circularly polarized wave emitted by a feed antenna element.

[0051] Figure 14 This is a simulated far-field normalized radiation pattern at a frequency of 11.5 GHz for a broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams in this invention, when excited by a right-hand circularly polarized wave emitted by a feed antenna element.

[0052] Figure 15 This is a graph showing the relationship between the axial ratio of the left / right circularly polarized beams corresponding to the maximum radiation direction and the frequency of a broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams in this invention.

[0053] Figure 16 This is a graph showing the relationship between the maximum gain of the left / right circularly polarized beams of a broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams and frequency.

[0054] In the diagram: 1. Planar reflector array; 2. X-band broadband dual-circular polarized planar feed; 3. X-band magnetoelectric dipole reflector element; 4. First dielectric substrate; 5. Second dielectric substrate; 6. Cross-shaped slot; 7. Circular magnetoelectric dipole; 8. First microstrip transmission line; 9. Second microstrip transmission line; 10. Metal ground layer; 11. Metal base plate layer; 12. Feed antenna element; 13. Feed antenna element microstrip line layer; 14. Lower dielectric substrate; 15. Square magnetoelectric dipole; 16. Metal via; 17. Coupling slot; 18. Orthogonal U-shaped microstrip line; 19. One-to-two equal amplitude and equal phase power divider; 20. 3dB directional coupler. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] Example 1:

[0057] See Figure 1-5 A broadband magnetoelectric dipole reflector array antenna with independently controllable dual circular polarization beams includes a planar reflector array 1 and an X-band broadband dual circular polarization planar feed 2. The planar reflector array 1 consists of 16×16 X-band magnetoelectric dipole reflector elements 3. The array size can also be expanded to other scales as needed, such as 20×20, 25×25, etc.

[0058] The array size is set according to the gain requirements. When the array size is relatively small, the array size is 10×10, 12×12, etc., and when the array size is relatively large, the array size is 30×30, 40×40, etc.

[0059] The X-band magnetoelectric dipole reflector unit 3 includes a circular magnetoelectric dipole 7, which serves as a radiator. The circular magnetoelectric dipoles 7 are equidistantly arranged and correspond to the cross-shaped slits 6.

[0060] The X-band magnetoelectric dipole reflector unit 3 includes a first dielectric substrate 4 and a second dielectric substrate 5. A reflector unit metal grounding layer 10 is provided between the first dielectric substrate 4 and the second dielectric substrate 5. The reflector unit metal grounding layer 10 is engraved with a cross-shaped slit 6. An air layer is provided between the second dielectric substrate 5 and the bottommost metal base plate layer 11.

[0061] In this embodiment, see Figure 2 , 6 The lower surface of the second dielectric substrate 5 is provided with a reflective unit microstrip line layer, which includes two segments: a first microstrip transmission line 8 and a second microstrip transmission line 9. The phase difference between the reflection of the two segments, the first microstrip transmission line 8 and the second microstrip transmission line 9, is always maintained at 180° to ensure that the circular polarization direction of the reflected wave is consistent with that of the incident wave. Therefore, the geometric phase of the reflected wave can be controlled by rotating the X-band magnetoelectric dipole reflective unit 3.

[0062] In this embodiment, Figure 6 This diagram illustrates a microstrip line layer with 16 different reflective units to achieve independent phase control of 2-bit left / right circularly polarized reflected waves. The differences lie in the lengths of the two sets of microstrip lines and the overall rotation angle of the unit. Geometric phase control can be achieved by rotating the X-band magnetoelectric dipole reflective unit 3. In the planar reflective array 1, the rotation angles of the circular magnetoelectric dipole 7, the cross-shaped slot 6, the first microstrip transmission line 8, and the second microstrip transmission line 9 in each unit are the same. The transmission phase can be controlled by changing the lengths of the two sets of microstrip transmission lines. Based on this, through coordinated control of the lengths of the microstrip transmission lines and the rotation angle of the entire X-band magnetoelectric dipole reflective unit 3, decoupling of the left / right circularly polarized wave phases can be achieved, enabling independent control of the left / right circularly polarized wave phases.

[0063] The X-band broadband dual-circularly polarized planar feed 2 is placed near the focal plane of the planar reflector array 1 and rotated 20° along the X-axis to reduce the blocking effect on the reflected waves. The X-band broadband dual-circularly polarized planar feed 2 consists of 2×2 feed antenna elements 12.

[0064] In this embodiment, the feed antenna unit 12 includes a square magnetoelectric dipole 15 formed by a square patch and a metal via 16 on the upper layer, two layers of feed antenna unit metal grounding layer and two layers of dielectric substrate.

[0065] The lower surface of the lower dielectric substrate 14 is provided with a feed antenna unit microstrip line layer 13. The lower dielectric substrate 14 is connected to a feeding mechanism through the feed antenna unit microstrip line layer 13. The feeding mechanism is used to feed the feed antenna unit 12. The two orthogonal feeding ports of the feed antenna unit 12 feed the coupling slot 17 through orthogonal U-shaped microstrip lines 18. A bridge structure is adopted at the junction of the two orthogonal U-shaped microstrip lines 18.

[0066] The feeding mechanism includes six equal amplitude and equal phase power dividers 19 and one 3dB directional coupler 20. The 3dB directional coupler 20 is connected to the input terminals of the two equal amplitude and equal phase power dividers 19. Each of the four feed antenna elements 12 is provided with two orthogonal feed ports, which are connected to the output terminals of the cascaded equal amplitude and equal phase power dividers 19. All equal amplitude and equal phase power dividers 19 are Wilkinson power dividers.

[0067] Simulation experiments were conducted using the aforementioned broadband magnetoelectric dipole reflector array antenna structure with independently controllable dual circularly polarized beams. The simulation results are as follows:

[0068] Figure 6 A schematic diagram of a microstrip line layer with 16 units to achieve independent phase control of 2-bit left / right circularly polarized reflected waves, wherein the circular magnetoelectric dipole 7 and the cross-shaped slot 6 of each unit have the same rotation angle as the microstrip transmission line.

[0069] Figure 7 and Figure 8 This is a schematic diagram of phase compensation for left-hand circularly polarized waves and right-hand circularly polarized waves. This phase compensation enables the left-hand circularly polarized beam to point in the +10° direction and the right-hand circularly polarized beam to point in the -20° direction in the xoz plane.

[0070] Figures 9-11 The normalized far-field radiation patterns of the reflector array antenna at different frequencies when transmitting left-hand circularly polarized waves to feed antenna element 12 are shown. Figure 9 Corresponding to 9.5-GHz, Figure 10 Corresponding to 10.5-GHz, Figure 11 Corresponding to 11.5-GHz; it can be seen that the left-hand circularly polarized beam in the xoz plane points in the +10° direction.

[0071] Figures 12-14 Normalized far-field radiation patterns of the reflector array antenna at different frequencies when transmitting right-hand circularly polarized waves for feed antenna element 12. Figure 12 Corresponding to 9.5-GHz, Figure 13 Corresponding to 10.5-GHz, Figure 14 Corresponding to 11.5-GHz; it can be seen that the right-hand circularly polarized beam in the xoz plane points in the -20° direction.

[0072] Figure 15 The graph shows the relationship between the axial ratio and frequency in the maximum radiation direction corresponding to left / right circularly polarized beams. Figure 16 The graph shows the relationship between the maximum gain and frequency for left / right circularly polarized beams.

[0073] The results show that the reflective array antenna can achieve independent control of the beam pointing of left-hand circular polarization and right-hand circular polarization, and has advantages such as high gain, wide bandwidth and simple structure.

[0074] The above description is only for the purpose of helping to understand the method and core essence of the present invention, but the scope of protection of the present invention is not limited thereto. For those skilled in the art, any equivalent substitutions or modifications made within the technical scope disclosed in the present invention, based on the technical solution and inventive concept, should be covered within the scope of protection of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams, characterized in that, It includes a planar reflector array (1) and an X-band broadband dual circular polarization planar feed (2), wherein the X-band broadband dual circular polarization planar feed (2) is placed at the focal plane of the planar reflector array (1) and rotated 20° along the lateral side of the planar reflector array (1). The planar reflection array (1) includes X-band magnetoelectric dipole reflection units (3), and there are n×n X-band magnetoelectric dipole reflection units (3). The X-band magnetoelectric dipole reflection units (3) are arranged in an n×n array to form the planar reflection array (1), where 10≤n≤40. The X-band magnetoelectric dipole reflection unit (3) has 16 left / right circular polarization reflection phase states to form a planar reflection array (1), realizing independent control of 2-bit left-circular polarization and 2-bit right-circular polarization reflection wave phases. The X-band magnetoelectric dipole reflector unit (3) includes a circular magnetoelectric dipole (7), a first dielectric substrate (4), and a second dielectric substrate (5); A reflective unit metal grounding layer (10) is provided between the first dielectric substrate (4) and the second dielectric substrate (5). The reflective unit metal grounding layer (10) is engraved with a cross-shaped slit (6). A reflective unit microstrip line layer is provided on the lower surface of the second dielectric substrate (5). The circular magnetoelectric dipole (7) serves as a radiator. The circular magnetoelectric dipole (7) is located above the metal grounding layer (10) of the reflector unit. The circular magnetoelectric dipole (7) is distributed in four quadrants corresponding to the cross-shaped gap (6). The microstrip line layer of the reflective unit includes a first microstrip transmission line (8) and a second microstrip transmission line (9); the first microstrip transmission line (8) and the second microstrip transmission line (9) are each provided with two segments, and the two segments of the first microstrip transmission line (8) and the two segments of the second microstrip transmission line (9) are arranged in a cross pattern. The two segments of the first microstrip transmission line (8) are arranged along one of the slots of the cross-shaped slot (6), and the two segments of the second microstrip transmission line (9) are arranged along the other slot of the cross-shaped slot (6). The transmission phase is controlled by changing the length of the first microstrip transmission line (8) and the second microstrip transmission line (9). At the same time, the reflection phases corresponding to the two segments of the first microstrip transmission line (8) and the two segments of the second microstrip transmission line (9) are always 180° apart, so as to ensure that the rotation direction of the incident and reflected circularly polarized waves is consistent. The circular magnetoelectric dipole (7), cross-shaped slit (6), first microstrip transmission line (8), and second microstrip transmission line (9) of each X-band magnetoelectric dipole reflection unit (3) in the planar reflection array (1) have the same rotation angle, that is, the X-band magnetoelectric dipole reflection unit (3) rotates as a whole to achieve the control of geometric phase.

2. The broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams according to claim 1, characterized in that: The 16 left / right circular polarization reflection phase states include: L0° / R0°, L0° / R90°, L0° / R180°, L0° / R270°; L90° / R0°, L90° / R90°, L90° / R180°, L90° / R270°; L180° / R0°, L180° / R90°, L180° / R180°, L180° / R270°; L270° / R0°, L270° / R90°, L270° / R180°, L270° / R270°; Where L x° / R y° represents the left-hand circularly polarized reflection phase as x° and the right-hand circularly polarized reflection phase as y°.

3. A broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams according to claim 1 or 2, characterized in that: The X-band broadband dual circular polarized planar feed (2) includes feed antenna elements (12), and there are 2×2 feed antenna elements (12) arranged in a 2×2 array.

4. The broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams according to claim 3, characterized in that: The feed antenna unit (12) includes a square magnetoelectric dipole (15), two layers of feed antenna unit metal grounding layer and two layers of dielectric substrate; The two-layer dielectric substrate includes an upper dielectric substrate and a lower dielectric substrate (14), and the two-layer feed antenna unit metal ground layer is located between the upper dielectric substrate and the lower dielectric substrate (14); the two-layer feed antenna unit metal ground layer is engraved with coupling gaps (17). The square magnetoelectric dipole (15) is located above the metal ground layer of the two-layer feed antenna unit. The square magnetoelectric dipole (15) is distributed in four quadrants corresponding to the coupling gap (17). The lower surface of the lower dielectric substrate (14) is provided with a feed antenna unit microstrip line layer (13). The lower dielectric substrate (14) is connected to a feeding mechanism through the feed antenna unit microstrip line layer (13). The feeding mechanism is used to feed the feed antenna unit (12).

5. A broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams according to claim 4, characterized in that: Both the square magnetoelectric dipole (15) and the circular magnetoelectric dipole (7) include a patch and a metal via (16). The patch in the circular magnetoelectric dipole (7) is an arc-shaped patch, and four arc-shaped patches can form a complete circle; The patch in the square magnetoelectric dipole (15) is a square patch.

6. A broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams according to claim 5, characterized in that: The feed antenna unit microstrip line layer (13) includes orthogonal U-shaped microstrip lines (18), and there are two orthogonal U-shaped microstrip lines (18). The junction of the two orthogonal U-shaped microstrip lines (18) adopts a bridge structure. The feed antenna unit (12) is provided with two orthogonal feed ports, which feed the coupling slot (17) through an orthogonal U-shaped microstrip line (18).

7. A broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams according to claim 6, characterized in that: The feeding mechanism includes six equal amplitude and equal phase power dividers (19) and a 3dB directional coupler (20). The 3dB directional coupler (20) is connected to the input terminals of the two equal amplitude and equal phase power dividers (19). Each of the four feed antenna units (12) is provided with two orthogonal feed ports and is connected to the output terminal of the cascaded equal amplitude and equal phase power divider (19).

8. A broadband magnetoelectric dipole reflector array antenna with independently controllable dual circularly polarized beams according to claim 7, characterized in that: The X-band magnetoelectric dipole reflector unit (3) and the feed antenna unit (12) both include a metal substrate layer (11), which is located below the second dielectric substrate (5) or the lower dielectric substrate (14). An air layer is provided between the second dielectric substrate (5) or the lower dielectric substrate (14) and the metal base plate layer (11).

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