Ultra-wideband axial ratio beam circularly polarized antenna

Abstract

The application provides a kind of ultra-wide bandwidth axial ratio beam circular polarization antenna, it relates to ultra-wide band antenna design technical field, including metal floor, first dielectric plate, radiation structure, wideband balun, frequency selective structure and feed bottom plate structure, the first dielectric plate is set on the top of the metal floor;The radiation structure is set on the upper surface of the first dielectric plate;Wideband balun is provided with four, four the wideband balun is symmetrically arranged, four the wideband balun is connected with the radiation structure by the first dielectric plate, four the wideband balun lower bottom surface is set on the metal floor;The frequency selective structure is arranged between the metal floor and the first dielectric plate, and the frequency selective structure is arranged as a circular ring;The feed bottom plate structure is arranged below the metal floor.The antenna of the application can realize ultra-wide band operation and stable circular polarization radiation in wide angle range simultaneously.

Description

Technical Field

[0001] This invention relates to the field of ultra-wideband antenna design technology, and more specifically, to an ultra-wideband axial ratio beam circularly polarized antenna. Background Technology

[0002] With the rapid development of modern wireless communication systems towards complex and dynamic scenarios such as low-Earth orbit satellite communication, global navigation, and UAV mobile platforms, circularly polarized antennas, capable of suppressing multipath interference and overcoming polarization mismatch, have become a core component for ensuring high-quality wireless links. In these applications, communication terminals are often in a state of high-speed movement or constantly changing attitude. This not only requires the antenna to have a sufficiently wide operating bandwidth to support high-speed data transmission, but also requires it to maintain good circular polarization purity over a wide hemispherical airspace (i.e., at a wide beam angle) to ensure the stability and reliability of the communication link. However, traditional circularly polarized antenna designs generally face the dual bottlenecks of "limited bandwidth" and "insufficient spatial coverage": their operating bandwidth is usually narrow, making it difficult to meet the needs of modern broadband systems; at the same time, their good circular polarization performance is often concentrated only near the antenna normal direction, and once the signal incident angle deviates, the performance deteriorates sharply, resulting in significant polarization mismatch loss over a wide angle range.

[0003] In existing technologies, researchers have attempted to extend the axial ratio bandwidth or optimize the beamwidth of antennas by employing multi-layer designs, adding stubs, or using special feeding methods. However, these approaches often struggle to achieve both: some designs significantly broaden the axial ratio bandwidth but sacrifice axial ratio beamwidth, resulting in poor wide-angle coverage; while other designs prioritize beamwidth, their usable operating bandwidth is relatively limited. This performance trade-off restricts the comprehensive application of antennas in complex, dynamic, and broadband communication scenarios.

[0004] Therefore, designing an antenna that can simultaneously achieve ultra-wideband operation and stable circular polarization radiation over a wide angle range is a problem that needs to be solved by existing technologies. Summary of the Invention

[0005] The purpose of this invention is to provide an ultra-wide bandwidth axial ratio circularly polarized beam antenna to improve the aforementioned problems. To achieve this objective, the technical solution adopted by this invention is as follows:

[0006] This application provides an ultra-wide bandwidth axial ratio beam-polarized antenna, comprising: a metal ground plane, a first dielectric substrate, a radiating structure, a broadband balun, a frequency selection structure, and a feeding base plate structure. The first dielectric substrate is disposed directly above the metal ground plane; the radiating structure is disposed on the upper surface of the first dielectric substrate; four broadband baluns are provided, arranged axially symmetrically, with the top surfaces of each of the four broadband baluns passing through the first dielectric substrate and connecting to the radiating structure, and all four broadband baluns are disposed on the metal ground plane; the frequency selection structure is disposed between the metal ground plane and the first dielectric substrate, and the frequency selection structure is configured as a ring; the feeding base plate structure is disposed below the metal ground plane.

[0007] Preferably, the frequency selection structure includes a second dielectric plate and frequency selection patches. The second dielectric plate is disposed on the upper surface of the metal floor and is configured as a hollow cylinder. The outer diameter of the second dielectric plate is the same as that of the first dielectric plate. The frequency selection patches are configured as cuboids, and a plurality of the frequency selection patches are uniformly attached along the outer side wall of the second dielectric plate, with the same gap between any two adjacent frequency selection patches.

[0008] Preferably, the power supply base plate structure includes a third dielectric plate and a power supply network, the upper surface of the third dielectric plate is connected to the lower surface of the metal floor, and the power supply network is electrically connected to the broadband balun.

[0009] Preferably, the broadband balun includes a fourth dielectric substrate, an asymmetric transmission line, and a metal ground plane. The metal ground plane is provided in four pieces, and the four metal ground planes are arranged in a symmetrical structure centered on the asymmetric transmission line. The metal ground plane is L-shaped, and the sidewalls of the metal ground plane are arc-shaped.

[0010] Preferably, the radiating structure is provided in four groups, each group of radiating structures includes two dipole metal patches and a group of interdigital capacitors, each group of interdigital capacitors is provided with multiple interdigital capacitors, and a group of interdigital capacitors is arranged between the two dipole metal patches in each group, and the two dipole metal patches in each group are configured as an axisymmetric structure.

[0011] Preferably, the two dipole metal patches are connected to the interdigitated capacitor in an alternating manner, and the other two sides of the dipole metal patches are set to be arc-shaped.

[0012] Preferably, the interdigitated capacitors are configured as curved rectangles, and the lengths of the interdigitated capacitors in the same group decrease proportionally from the outer wall of the first dielectric plate towards the center.

[0013] Preferably, the first medium plate is provided with a circular through hole.

[0014] Preferably, the input terminal of the power supply network is electrically connected to the radio frequency connector, and the output terminal of the power supply network is electrically connected to each of the four broadband baluns.

[0015] Preferably, the power supply network includes an input interface, a first output interface, a second output interface, a third output interface, a fourth output interface, a first 90° phase shifter, a second 90° phase shifter, a third 90° phase shifter, a fourth 90° phase shifter, a first power divider, a second power divider, and a third power divider. The input interface is electrically connected to the input terminal of the first power divider. One output terminal of the first power divider is electrically connected to the input terminal of the second power divider. One output terminal of the second power divider is electrically connected to the first output interface via the first 90° phase shifter. The other output terminal of the second power divider is electrically connected to the second output structure. The other output terminal of the first power divider is electrically connected to the input terminal of the third power divider via the second and third 90° phase shifters connected in series. One output terminal of the third power divider is electrically connected to the third output interface. The other output terminal of the third power divider is electrically connected to the fourth output structure via the fourth 90° phase shifter.

[0016] The beneficial effects of this invention are as follows:

[0017] This invention employs a radiating structure composed of four axisymmetrically arranged conical dipole metal patches, with interdigital capacitors loaded between adjacent patches. This introduces the principle of tight coupling into the design, effectively compensating for the inductive component caused by the metal ground plane. This achieves excellent impedance matching over the ultra-wideband range, fundamentally overcoming the bottleneck of narrow operating bandwidth in traditional circularly polarized antennas. Simultaneously, combined with a 1-to-4 broadband power-dividing phase-shifting feed network, it can stably generate four equal-amplitude excitation signals with sequentially 90-degree phase differences across the entire wideband, ensuring the purity and stability of the circularly polarized wave radiated by the antenna in the ultra-wideband. In particular, the circular frequency selection structure surrounding the radiating structure introduces the required vertical polarization component into the antenna's radiation field, effectively optimizing the axial ratio performance in the low elevation angle region. This achieves both ultra-wideband operating bandwidth and the ability to maintain good circular polarization characteristics over a wide angle range, successfully resolving the core contradiction in existing technologies that struggle to balance ultra-wideband and wide axial ratio beamwidth.

[0018] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing embodiments of the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a longitudinal sectional view of the ultra-wide bandwidth axial ratio circularly polarized beam antenna described in an embodiment of the present invention;

[0021] Figure 2 This is a top view schematic diagram of the ultra-wide bandwidth axial ratio beam circularly polarized antenna described in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the feed network layout for the ultra-wide bandwidth axial ratio beam circularly polarized antenna described in this embodiment of the invention.

[0023] Figure 4 This is a schematic diagram of a broadband balun in an ultra-wide bandwidth axial ratio beam circularly polarized antenna as described in an embodiment of the present invention;

[0024] Figure 5 The reflection coefficient of the ultra-wide bandwidth axial ratio circularly polarized beam antenna described in this embodiment of the invention. Schematic diagram;

[0025] Figure 6 This is a schematic diagram of the normal axial ratio of the ultra-wide bandwidth axial ratio beam circularly polarized antenna described in this embodiment of the invention;

[0026] Figure 7 This is a schematic diagram of the actual gain of the ultra-wide bandwidth axial ratio beam circularly polarized antenna described in this embodiment of the invention;

[0027] Figure 8 This is a schematic diagram illustrating the radiation efficiency of the ultra-wide bandwidth axial ratio beam circularly polarized antenna described in this embodiment of the invention.

[0028] Figure 9 The ultra-wide bandwidth axial ratio beam circularly polarized antenna described in this embodiment of the invention has xoz surfaces before and after the loading frequency selection surface. and A schematic diagram of the axial ratio at the location;

[0029] Figure 10 The ultra-wide bandwidth axial ratio beam circularly polarized antenna described in this embodiment of the invention has yoz planes before and after the loading frequency selection surface. and A schematic diagram of the axial ratio at a certain point.

[0030] In the diagram: 1. First dielectric substrate; 2. Frequency selection patch; 3. Second dielectric substrate; 4. Third dielectric substrate; 5. Interdigital capacitor; 6. Dipole metal patch; 7. Fourth dielectric substrate; 8. Metal ground plane; 9. Metal ground plane; 10. Power supply network; 11. Input interface; 12. First output interface; 13. Second output interface; 14. Third output interface; 15. Fourth output interface; 16. First 90° phase shifter; 17. Second 90° phase shifter; 18. Third 90° phase shifter; 19. Fourth 90° phase shifter; 20. First power divider; 21. Second power divider; 22. Third power divider; 23. Asymptotic transmission line. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Example 1:

[0034] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10This embodiment provides an ultra-wide bandwidth axial ratio circularly polarized beam antenna, comprising: a metal ground plate 9, a first dielectric substrate 1, a radiating structure, a broadband balun, a frequency selection structure, and a feeding base plate structure. The first dielectric substrate 1 is disposed directly above the metal ground plate 9; the radiating structure is disposed on the upper surface of the first dielectric substrate 1; four broadband baluns are provided, which are axially symmetrically arranged, and the top surfaces of the four broadband baluns all pass through the first dielectric substrate 1 and are connected to the radiating structure, and the four broadband baluns are all disposed on the metal ground plate 9; the frequency selection structure is disposed between the metal ground plate 9 and the first dielectric substrate 1, and the frequency selection structure is configured as a ring; the feeding base plate structure is disposed below the metal ground plate 9.

[0035] It is understandable that this step, through the aforementioned structural layout, collaboratively designs the radiating structure, broadband balun, frequency selection structure, metal ground plane 9, and dielectric substrate, creatively constructing a compact, integrated radiating system. The four axisymmetrically arranged broadband baluns not only provide balanced feed connections for the radiating structure, but their connection to the metal ground plane 9 through the dielectric substrate also achieves excellent impedance transformation and common-mode rejection within the broadband range, laying the foundation for ultra-wideband operation. In particular, an innovative circular frequency selection structure is introduced between the metal ground plane 9 and the first dielectric substrate 1 carrying the radiating structure. This structure can generate specific coupling with the radiated field, effectively controlling the antenna's current distribution and radiation phase, thereby significantly optimizing circular polarization purity over a wide beam angle. This layout enables the simultaneous realization of ultra-wideband characteristics and wide-axis ratio beam characteristics.

[0036] The frequency selection structure includes a second dielectric plate 3 and a frequency selection patch 2. The second dielectric plate 3 is disposed on the upper surface of the metal floor 9 and is configured as a hollow cylinder. The outer diameter of the second dielectric plate 3 is the same as the outer diameter of the first dielectric plate 1. The frequency selection patch 2 is configured as a cuboid. Multiple frequency selection patches 2 are uniformly attached along the outer side wall of the second dielectric plate 3, and the gap between any two adjacent frequency selection patches 2 is the same.

[0037] It is understood that this invention integrates frequency-selective patches 2 with uniform gaps and periodic arrangement onto a hollow cylindrical second dielectric substrate 3, precisely matching and tightly surrounding the outer diameter of the first dielectric substrate 1 where the radiating structure is located, thus forming a regular and efficient annular frequency-selective structure. This design enables the frequency-selective patch array 2 to achieve stable and controllable coupling with the electromagnetic field generated by the radiating structure, introducing or enhancing the vertical polarization field component in a specific spatial direction, thereby effectively offsetting the polarization elliptic distortion of the original radiated field in the low elevation angle region. It is not only easy to manufacture and has good performance consistency, but it can also specifically optimize the axial ratio performance of the antenna over a wide angle range, significantly expanding the spatial coverage range for maintaining good circular polarization characteristics while achieving ultra-wideband radiation, thus enhancing its practicality in complex communication environments.

[0038] The power supply base structure includes a third dielectric plate 4 and a power supply network 10. The upper surface of the third dielectric plate 4 is connected to the lower surface of the metal floor 9. The power supply network 10 is printed on the lower surface of the third dielectric plate 4 and is electrically connected to the broadband balun.

[0039] It is understood that this invention achieves spatial isolation and layered layout between the feeding system and the radiation system by independently printing the feeding network 10 on the third dielectric substrate 4 located below the metal ground plane 9. This architecture places the feeding circuitry below the metal ground plane 9, utilizing the metal ground plane 9 as a natural electromagnetic shielding layer to effectively block potential interference from the current on the feeding network 10 to the upper radiation pattern, ensuring the purity of the radiation pattern. Simultaneously, after the signal is generated and distributed through this bottom-layer feeding network 10, it is vertically transmitted to the upper radiation structure via a broadband balun, forming a clear and stable signal transmission path. This compact and isolated vertical integration method not only optimizes space utilization and reduces cross-coupling but also allows for relatively independent debugging of the feeding network 10 and optimization of its radiation performance, improving design flexibility and overall antenna reliability, and providing a solid feeding foundation for achieving ultra-wideband and stable beam performance.

[0040] The broadband balun includes a fourth dielectric substrate 7, an asymmetric transmission line 23, and a metal ground plane 8. There are four metal ground planes 8, which are arranged in a symmetrical structure centered on the asymmetric transmission line 23. The metal ground planes 8 are L-shaped, and the sidewalls of the metal ground planes 8 are arc-shaped.

[0041] It is understood that this invention achieves a compact and high-performance broadband unbalanced-to-balanced converter by designing the metal ground plane 8 as an L-shaped symmetrical structure with rounded sidewalls, and integrating it with the fourth dielectric substrate 7 and the asymptotic transmission line 23 to form a broadband balun. The L-shaped symmetrical structure ensures the amplitude and phase symmetry of the balun itself and its excitation signal, laying the foundation for the generation of pure circularly polarized waves by the radiating structure. In particular, the rounded sidewall design of the metal ground plane 8 effectively smooths the high-frequency current path, reduces parasitic inductance and capacitance caused by discontinuous structures, and thus significantly widens the effective operating bandwidth of the balun.

[0042] The radiation structure is provided in four groups. Each group of radiation structures includes two dipole metal patches 6 and a group of interdigitated capacitors 5. Each group of interdigitated capacitors 5 is provided with multiple interdigitated capacitors. A group of interdigitated capacitors 5 is arranged between the two dipole metal patches 6 in each group. The two dipole metal patches 6 in each group are set as an axisymmetric structure.

[0043] It is understood that the axisymmetric layout of the present invention provides a physical basis for generating spatially orthogonal radiation modes, which is a necessary condition for forming circularly polarized waves. Secondly, a set of interdigital capacitors 5 are arranged between the two dipole metal patches 6 in each group, which can effectively compensate for the inductive reactance caused by the near-field effect of the metal ground plane 9, thereby achieving excellent impedance matching in an extremely wide frequency band, which is the key to obtaining ultra-wideband performance. Furthermore, the parallel use of multiple interdigital capacitors 5 enhances and stabilizes this coupling effect, so that the antenna has good consistency in electrical performance in the ultra-wideband.

[0044] The two dipole metal patches 6 are connected to the interdigitated capacitor 5 in an alternating manner, and the other two sides of the dipole metal patches 6 are set as arcs.

[0045] It is understandable that by connecting the dipole metal patch 6 and the interdigital capacitor 5 alternately, and designing the other two sides as arcs, a conical or gradually deformed patch profile is formed. The alternate connection with the interdigital capacitor 5 ensures the geometric regularity of the coupling region, providing a stable and predictable coupling path for multiple interdigital capacitors 5. The other two arc-shaped sides form the radiation boundary of the patch body. Its smooth and gradually changing profile can guide the surface current to be distributed more smoothly, effectively suppressing current accumulation and unwanted modes caused by abrupt edge changes, thereby optimizing radiation efficiency and radiation pattern characteristics.

[0046] The interdigitated capacitor 5 is configured as an arc-shaped rectangle, and the length of the interdigitated capacitor 5 in the same group decreases proportionally from the outer side wall of the first dielectric plate 1 towards the center.

[0047] It is understood that the regular curved rectangle in this invention is easy to process precisely, and by controlling the gap between adjacent interdigitates and the length of the interdigitates, a stable and predictable coupling capacitance value can be obtained; secondly, the proportionally decreasing length design is an ingenious structural matching, which allows the coupling capacitance value between radiating units to change smoothly and continuously.

[0048] The first medium plate 1 is provided with a circular through hole.

[0049] It is understood that the combination of this through-hole and the axially symmetrical layout of the four broadband baluns in this invention together ensures the strict rotational symmetry of the entire antenna system.

[0050] The input terminal of the power supply network 10 is electrically connected to the radio frequency connector, and the output terminal of the power supply network 10 is electrically connected to each of the four broadband baluns.

[0051] It is understood that the RF connector of this invention serves as a standard interface, enabling convenient connection between the antenna and external systems. The feed network 10 can precisely distribute and convert a single input signal into four signals with equal amplitude and sequentially 90° phase differences within the ultra-wideband range. These four signals are fed to four axisymmetrically arranged broadband baluns, ensuring that the signals driving the four radiating elements possess the precise amplitude and phase relationships required to generate circularly polarized waves. This direct, fixed-point connection method, with its clear signal path and controllable loss, is crucial for the feed network 10 to feed the input signal to the radiating end after power distribution and phase shifting, providing excellent excitation assurance for the antenna to achieve stable and pure circularly polarized radiation within the ultra-wideband range.

[0052] The power supply network 10 includes an input interface 11, a first output interface 12, a second output interface 13, a third output interface 14, a fourth output interface 15, a first 90° phase shifter 16, a second 90° phase shifter 17, a third 90° phase shifter 18, a fourth 90° phase shifter 19, a first power divider 20, a second power divider 21, and a third power divider 22. The input interface 11 is electrically connected to the input terminal of the first power divider 20, and one output terminal of the first power divider 20 is electrically connected to the input terminal of the second power divider 21. One output terminal of the first power divider 20 is electrically connected to the first output interface 12 via the first 90° phase shifter 16. The other output terminal of the second power divider 21 is electrically connected to the second output interface 13. The other output terminal of the first power divider 20 is electrically connected to the input terminal of the third power divider 22 via the second 90° phase shifter 17 and the third 90° phase shifter 18 connected in series. One output terminal of the third power divider 22 is electrically connected to the third output interface 14. The other output terminal of the third power divider 22 is electrically connected to the fourth output interface 15 via the fourth 90° phase shifter 19.

[0053] It is understood that the tree-like power divider phase-shifting feed network structure of this invention can ensure that the signals output from the four output interfaces have highly consistent amplitudes and precise 0°, 90°, 180°, and 270° phase relationships within the ultra-wideband frequency range. This network is the core circuit that converts a single input into the orthogonal signals required for four circular polarization excitations. Its design is to ensure the power supply for achieving ultra-wideband antenna operation and stable circular polarization radiation performance.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0055] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A wide bandwidth axial ratio beam circularly polarized antenna, characterized in that, include: Metal floor (9); The first medium plate (1) is disposed directly above the metal floor (9); A radiating structure is disposed on the upper surface of the first dielectric plate (1); Four broadband baluns are provided, and the four broadband baluns are arranged symmetrically on the axis. The four broadband baluns pass through the first dielectric plate (1) and are connected to the radiation structure. All four broadband baluns are provided on the metal floor (9). A frequency selection structure is provided between the metal floor (9) and the first dielectric plate (1), and the frequency selection structure is configured as a ring. A power supply base plate structure is disposed below the metal floor (9).

2. The ultra-wide bandwidth axial ratio beam circularly polarized antenna according to claim 1, characterized in that... The frequency selection structure includes a second dielectric plate (3) and a frequency selection patch (2). The second dielectric plate (3) is disposed on the upper surface of the metal floor (9). The second dielectric plate (3) is a hollow cylinder. The outer diameter of the second dielectric plate (3) is the same as the outer diameter of the first dielectric plate (1). The frequency selection patch (2) is a cuboid. Multiple frequency selection patches (2) are uniformly attached along the outer side wall of the second dielectric plate (3). The gap between any two adjacent frequency selection patches (2) is the same.

3. The ultra-wide bandwidth axial ratio beam circularly polarized antenna according to claim 1, characterized in that... The power supply base structure includes a third dielectric plate (4) and a power supply network (10). The upper surface of the third dielectric plate (4) is connected to the lower surface of the metal floor (9). The power supply network (10) is printed on the lower surface of the third dielectric plate (4) and is electrically connected to the broadband balun.

4. The ultra-wide bandwidth axial ratio beam circularly polarized antenna according to claim 1, characterized in that... The broadband balun includes a fourth dielectric substrate (7), an asymmetric transmission line (23), and a metal ground plane (8). The metal ground plane (8) consists of four pieces, which are arranged in a symmetrical structure centered on the asymmetric transmission line (23). The metal ground plane (8) is L-shaped, and the sidewalls of the metal ground plane (8) are arc-shaped.

5. The ultra-wide bandwidth axial ratio beam circularly polarized antenna according to claim 1, characterized in that... The radiation structure is provided in four groups. Each group of radiation structures includes two dipole metal patches (6) and a group of interdigitated capacitors (5). Each group of interdigitated capacitors (5) is provided in multiple ways. A group of interdigitated capacitors (5) is arranged between the two dipole metal patches (6) in each group. The two dipole metal patches (6) in each group are set as an axisymmetric structure.

6. The ultra-wide bandwidth axial ratio beam circularly polarized antenna according to claim 5, characterized in that... The dipole metal patch (6) is connected to the interdigitated capacitor (5) in an alternating manner, and the other two sides of the dipole metal patch (6) are set as arcs.

7. The ultra-wide bandwidth axial ratio beam circularly polarized antenna according to claim 5, characterized in that... The interdigitated capacitor (5) is set as an arc-shaped rectangle, and the length of the interdigitated capacitor (5) in the same group decreases proportionally from the outer side wall of the first dielectric plate (1) towards the center.

8. The ultra-wide bandwidth axial ratio beam circularly polarized antenna according to claim 1, characterized in that... The first medium plate (1) is provided with a circular through hole.

9. The ultra-wide bandwidth axial ratio beam circularly polarized antenna according to claim 3, characterized in that... The input terminal of the power supply network (10) is electrically connected to the radio frequency connector, and the output terminal of the power supply network (10) is electrically connected to the four broadband baluns respectively.

10. The ultra-wide bandwidth axial ratio beam circularly polarized antenna according to claim 3, characterized in that... The power supply network (10) includes an input interface (11), a first output interface (12), a second output interface (13), a third output interface (14), a fourth output interface (15), a first 90° phase shifter (16), a second 90° phase shifter (17), a third 90° phase shifter (18), a fourth 90° phase shifter (19), a first power divider (20), a second power divider (21), and a third power divider (22). The input interface (11) is electrically connected to the input terminal of the first power divider (20), and one output terminal of the first power divider (20) is electrically connected to the input terminal of the second power divider (21). One output terminal of the power divider (21) is electrically connected to the first output interface (12) via the first 90° phase shifter (16). The other output terminal of the second power divider (21) is electrically connected to the second output interface (13). The other output terminal of the first power divider (20) is electrically connected to the input terminal of the third power divider (22) via the second 90° phase shifter (17) and the third 90° phase shifter (18) connected in series. One output terminal of the third power divider (22) is electrically connected to the third output interface (14). The other output terminal of the third power divider (22) is electrically connected to the fourth output interface (15) via the fourth 90° phase shifter (19).

Images