A wide-axis-ratio beam dual circularly polarized antenna unit with a simple structure

Abstract

The present application discloses a wide-axis-ratio beam dual-circular-polarized antenna unit, antenna, array, and radar with a simple structure. The antenna unit is arranged in a metal back cavity through a dielectric plate. The first sector dipole antenna of each of the first group of radiating elements and the second group of radiating elements are cross-connected between the adjacent sides of the second sector dipole antenna. The first end of the first feed balun is connected to the center of the first sector dipole antenna, and the other end is connected to the circular hole of the second sector dipole antenna of the second group of radiating elements. The first end of the second feed balun is connected to the center of the first sector dipole antenna, and the second end is connected to the circular hole of the second sector dipole antenna of the first group of radiating elements. The first end of each of the two ohmic coaxial lines is connected to the second end of the two first feed baluns and the second end of the third sub-feed balun, respectively. The present application overcomes the shortcomings of the existing dual-circular-polarized antenna technology and utilizes a special interlaced finger structure to provide an antenna with a simple and compact structure that can achieve dual circular polarization.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a wide-axis-ratio beam dual-circular-polarized antenna unit, antenna, array and radar with a simple structure. Background Art

[0002] With the advancement of satellite communications and radar detection technologies, single polarization is no longer sufficient for tracking high-speed targets, detecting objects in various situations, or achieving perfect signal reception under various polarization modes. When using linearly polarized antennas for tracking, when information such as the incoming signal frequency and polarization is unknown, there may be some polarization loss, or effective tracking may be impossible in the presence of cross-polarization. Circularly polarized antennas can analyze the phase correlation of echo signals to determine the target's scattering polarization matrix, thereby improving detection range and accuracy. Circularly polarized antenna signals can be received by antennas of any polarization and offer advantages such as interference resistance, rain and fog resistance, and multipath immunity. However, achieving dual circular polarization complicates the antenna structure and increases the difficulty of fabrication. Current conventional antenna technologies for achieving circular polarization, whether using a bridge or series-fed structure, increase antenna design complexity, structural complexity, and practical application challenges. These bridge and series-fed structures struggle to achieve both simplicity and performance, making antenna assembly and welding difficult. This impacts performance during fabrication and prevents optimal performance.

[0003] Current research on dual circularly polarized antennas, both domestically and internationally, utilizes bridge structures to achieve dual circular polarization. Some utilize ring-shaped bridge structures, resulting in wide axial ratio bandwidth, low cross-polarization, and high gain, while others utilize miniaturized branch 3dB bridges. Serial-fed structures are also a common technique for achieving dual circular polarization. For example, dual-band dual circularly polarized radial slot antennas and wide-beamwidth broadband dual circularly polarized patch antennas utilize serial-fed structures, resulting in excellent antenna characteristics.

[0004] However, existing technologies for realizing dual circular polarization of antennas, whether they are bridge structures or series-fed structures, introduce additional feeding networks, which complicates the antenna structure. Summary of the Invention

[0005] The main purpose of this application is to provide a wide axial ratio beam dual circular polarization antenna unit, antenna, array and radar with a simple structure, aiming to solve the technical problem that the existing antenna dual circular polarization technology, whether it is a bridge structure or a series fed structure, introduces an additional feeding network, which complicates the antenna structure.

[0006] To achieve the above-mentioned purpose, the present application provides a wide-axis-ratio beam dual-circular-polarized antenna unit with a simple structure, comprising: a metal back cavity, a dielectric plate, a first group of radiating elements, a second group of radiating elements, a first feed balun, a second feed balun and two ohmic coaxial lines; a rectangular groove is provided around the inner side of the metal back cavity near the opening, and the dielectric plate is provided in the rectangular groove; the first group of radiating elements and the second group of radiating elements are mirror-symmetrical and are both etched on the side of the dielectric plate near the metal back cavity, and the first group of radiating elements and the second group of radiating elements each include a first sector dipole antenna and a second sector dipole antenna. Two sector dipole antennas, and the two adjacent sides of the first sector dipole antenna and the second sector dipole antenna in the first group of radiating elements / the second group of radiating elements are parallel, the adjacent sides of the first sector dipole antennas of the first group of radiating elements and the second group of radiating elements are cross-connected, and the two adjacent sides of the respective second sector dipole antennas have cross-fingering, and the tops of the two second sector dipole antennas are each provided with a circular hole; the first feed balun is etched on the surface of the dielectric plate away from the metal back cavity, and the first feed balun is The first end of the first sub-feed balun is connected to the center of the first sector dipole antenna of the first group of radiating elements, and the other end is connected to the circular hole of the second sector dipole antenna of the second group of radiating elements; the second feeding balun includes a first sub-feed balun to a third sub-feed balun, the first end first sub-feed balun and the third sub-feed balun are both etched on the surface of the dielectric plate away from the metal back cavity, the second sub-feed balun is etched on the surface of the dielectric plate close to the metal back cavity, and the first end of the first sub-feed balun is connected to the first sector dipole antenna of the second group of radiating elements. The center of the circle of the line, the second end of the two ohmic coaxial lines is connected to the first end of the second sub-feed balun through the first metal via, the second end of the second sub-feed balun is connected to the first end of the third sub-feed balun through the second metal via, and the second end of the third sub-feed balun is connected to the circular hole of the second sector-shaped dipole antenna of the first group of radiating elements; the first end of each of the two ohmic coaxial lines is respectively connected to the second end of the two first feed baluns and the second end of the third sub-feed balun, and the second end of each of the two ohmic coaxial lines passes through the second sector-shaped dipole antenna, the dielectric plate and the metal back cavity opposite to each other in sequence.

[0007] Optionally, the dielectric board is made of Rogers RO4350 high-frequency and high-speed circuit board material, and the relative dielectric constant of the dielectric board is 3.52 to 3.69.

[0008] Optionally, the impedance of the two ohmic coaxial lines is 50 ohms.

[0009] Optionally, the two vertex corners of the first sector dipole antenna and the second sector dipole antenna of the first group of radiating elements both have a first cut angle, and the two vertex corners of the first sector dipole antenna and the second sector dipole antenna of the second group of radiating elements both have a second cut angle, the two first cut angles and the two second cut angles form a quadrilateral, and the four vertex corners of the quadrilateral are open.

[0010] Optionally, the first feed balun and the first sub-feed balun are both Y-shaped, and the V-shaped open end of the first feed balun is connected to the first cut corner of the first sector dipole antenna in the first group of radiating elements, the remaining end of the first feed balun is connected to the circular hole of the second sector dipole in the second group of radiating elements, the V-shaped open end of the first sub-feed balun is connected to the second cutout of the first sector dipole antenna in the second group of radiating elements, and the remaining end is connected to the first end of the second sub-feed balun.

[0011] Optionally, the first sector-shaped dipole antenna and the second sector-shaped dipole antenna each have two dipole arms, and the two dipole arms are axially symmetric.

[0012] Optionally, the first sector dipole antenna and the second sector dipole antenna both include a connecting line with rectangular teeth and a connecting line without rectangular teeth, and the first ends of the connecting line with rectangular teeth and the connecting line without rectangular teeth of the first sector dipole antenna / the second sector dipole antenna are respectively connected to the ends of the two dipole arms that are away from each other;

[0013] The rectangular teeth connecting lines of the first sector dipole antennas of the first group of radiating elements and the second group of radiating elements are interdigitally connected to each other;

[0014] The rectangular teeth connecting lines of the second sector dipole antennas of the first group of radiating elements and the second group of radiating elements are cross-digitally connected to each other.

[0015] To achieve the above objectives, the present application also provides a dual circularly polarized antenna having the wide axial ratio beam dual circularly polarized antenna unit with a simple structure provided by any one of the above embodiments.

[0016] To achieve the above objectives, the present application also provides a dual circularly polarized antenna array, which has the dual circularly polarized antenna provided by any one of the aforementioned embodiments.

[0017] To achieve the above objectives, the present application also provides a radar having the dual circularly polarized antenna array provided by any one of the aforementioned embodiments.

[0018] The embodiments of the present application propose a wide-axis-ratio beam dual-circular-polarized antenna unit, antenna, array and radar with a simple structure, wherein a rectangular groove is provided around the inner side of a metal back cavity near an opening, and a dielectric plate is provided in the rectangular groove; the first group of radiating elements and the second group of radiating elements are mirror-symmetrical, and the first group of radiating elements and the second group of radiating elements both include a first sector dipole antenna and a second sector dipole antenna, and the two adjacent sides of the first sector dipole antenna and the second sector dipole antenna in the first group of radiating elements / the second group of radiating elements are parallel, the adjacent sides of the first sector dipole antenna of each of the first group of radiating elements and the second group of radiating elements are cross-connected, and the two adjacent sides of the respective second sector dipole antennas have cross-fingering, and a circular hole is provided on the top of each of the two second sector dipole antennas; a first feed balun is etched on the surface of the dielectric plate away from the metal back cavity, the first end of the first feed balun is connected to the center of the first sector dipole antenna of the first group of radiating elements, and the other end is connected to the circular hole of the second sector dipole antenna of the second group of radiating elements; The two-feed balun includes a first sub-feed balun to a third sub-feed balun. The first end of the first sub-feed balun and the third sub-feed balun are both etched on the surface of the dielectric plate away from the metal back cavity, and the second sub-feed balun is etched on the surface of the dielectric plate close to the metal back cavity. The first end of the first sub-feed balun is connected to the center of the first sector dipole antenna of the second group of radiating elements, and the second end is connected to the first end of the second sub-feed balun through a first metal via. The second end of the second sub-feed balun is connected to the first end of the third sub-feed balun through a second metal via, and the second end of the third sub-feed balun is connected to the circular hole of the second sector dipole antenna of the first group of radiating elements; the first end of each of the two ohmic coaxial lines is respectively connected to the second end of the two first feed baluns and the second end of the third sub-feed balun, and the second end of each passes through the second sector dipole antenna, the dielectric plate and the metal back cavity opposite to each other in sequence. The present application overcomes the shortcomings of the existing dual circularly polarized antenna technology and uses a special staggered finger structure to provide an antenna with a simple and compact structure that can achieve dual circular polarization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a side view of the antenna of the present invention;

[0020] Figure 2 A top view of the antenna of the present invention;

[0021] Figure 3 is a cross-sectional view of the antenna of the present invention;

[0022] Figure 4 A top view of the ring-shaped metal patch of the present invention;

[0023] Figure 5 is a side view of the balun of the present invention;

[0024] Figure 6 is the S-parameter diagram of the antenna of the present invention;

[0025] Figure 7 is the overall gain, left-hand gain, and top axis ratio of the antenna;

[0026] Figure 8 This is the axial ratio diagram at 2.2GHz frequency;

[0027] Figure 9 This is the axial ratio diagram at 2.3GHz frequency;

[0028] Figure 10 This is the axial ratio diagram at 2.4GHz frequency.

[0029] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] Reference Figure 1 and Figure 2 The first embodiment of the present application provides a wide-axis-ratio beam dual circularly polarized antenna unit with a simple structure. The dual circularly polarized antenna unit may include:

[0032] A metal back cavity 1, a dielectric plate 2, a first group of radiating elements 3, a second group of radiating elements 7, a first feeding balun 5, a second feeding balun 6 and two ohmic coaxial lines 4; a rectangular groove is provided around the inner side of the metal back cavity 1 near the opening, and the dielectric plate 2 is provided in the rectangular groove; the first group of radiating elements 3 and the second group of radiating elements 7 are mirror-symmetrical and are both etched on the side of the dielectric plate 2 near the metal back cavity 1, the first group of radiating elements 3 and the second group of radiating elements 7 each include a first sector dipole antenna 8 and a second sector dipole antenna 9, and the first group of radiating elements 3 / the second group of radiating elements 7 are all provided with a first sector dipole antenna 8 and a second sector dipole antenna 9. The two adjacent sides of the first sector dipole antenna 8 and the second sector dipole antenna 9 are parallel, the adjacent sides of the first sector dipole antenna 8 of each of the first group of radiating elements 3 and the second group of radiating elements 7 are cross-connected, and the two adjacent sides of the second sector dipole antenna 9 are cross-connected, and a circular hole is provided on the top of each of the two second sector dipole antennas 9; the first feeding balun 5 is etched on the surface of the dielectric plate 2 away from the metal back cavity 1, and the first end of the first feeding balun 5 is connected to the circular hole of the first sector dipole antenna 8 of the first group of radiating elements 3. The center of the first sector dipole antenna 8 of the second group of radiating elements 7 is connected to the center of the first sector dipole antenna 8 of the second group of radiating elements 7, and the other end is connected to the circular hole of the second feed balun 6, including a first sub-feed balun 601 to a third sub-feed balun 603, the first end first sub-feed balun 601 and the third sub-feed balun 603 are both etched on the surface of the dielectric plate 2 away from the metal back cavity 1, the second sub-feed balun 602 is etched on the surface of the dielectric plate 2 close to the metal back cavity 1, and the first end of the first sub-feed balun 601 is connected to the center of the first sector dipole antenna 8 of the second group of radiating elements 7, and the second end is connected to the center of the first sector dipole antenna 8 of the second group of radiating elements 7 through the first sub-feed balun 601. A metal via is connected to the first end of the second sub-feed balun 602, the second end of the second sub-feed balun 602 is connected to the first end of the third sub-feed balun 603 through a second metal via, and the second end of the third sub-feed balun 603 is connected to the circular hole of the second sector dipole antenna 9 of the first group of radiating elements 3; the first end of each of the two ohmic coaxial lines 4 is respectively connected to the second ends of the two first feed baluns 5 and the second end of the third sub-feed balun 603, and the second end of each passes through the second sector dipole antenna 9, the dielectric plate 2 and the metal back cavity 1 opposite to each other in sequence.

[0033] Specifically, the present application provides a dual circularly polarized antenna unit with a simple structure operating in the 2.2-2.4 GHz frequency band, including a metal back cavity 1, a dielectric plate 2, a first group of radiating elements 3, a second group of radiating elements 7, a first feed balun 5, a second feed balun 6 and two ohmic coaxial lines 44, wherein the metal back cavity 1 is a hollow rectangular metal cavity without an upper surface, and a dielectric plate 2 is covered directly above the metal cavity; the upper surface of the dielectric plate 2 is etched with the entire structure of the first feed balun 5 and a part of the structure of the second feed balun 6, and the lower surface is etched with the radiator of the first group of radiating elements 3 and the second group of radiating elements 7 of the antenna and another part of the structure of the second feed balun 6, reference Figure 3 , two ohmic coaxial lines 4 are connected to two feeding baluns respectively. The antenna structure of this application is simple, easy to miniaturize the antenna, and easy to process. Figure 5 The first sub-feed balun 601 is entirely on the top of the dielectric plate 2, the second sub-feed balun 602 is located on the lower wall of the dielectric plate 2, the first sub-feed balun 601 is located on the top wall of the dielectric plate 2, and the third sub-feed balun 603 is located on the top wall of the dielectric plate 2. The tail of the first sub-feed balun 601 and the head of the second sub-feed balun 602 are connected through the first metal via 203, and the tail of the second sub-feed balun 602 and the head of the third sub-feed balun 603 are connected through the second metal via 204. This prevents the two feed baluns from interfering with each other and achieves their respective impedance matching.

[0034] In the embodiment of the present application, the dielectric plate 2 is made of Rogers RO4350 high-frequency and high-speed circuit board material, and the relative dielectric constant of the dielectric plate 2 is 3.52 to 3.69. It should be noted that Rogers RO4350 is a proprietary glass cloth reinforced, ceramic / hydrocarbon composite high-frequency and high-speed circuit board material. The dielectric constant of Rogers RO4350 can be 3.52 to 3.69. Specifically, the dielectric constant can be 3.50, 3.52, 3.63, 3.66 and 3.69. The loss factor is 0.0037 at 10GHz, and the dielectric constant remains stable with minimal variation over a wide frequency range of 1GHz to 40GHz, ensuring good signal integrity during signal transmission in the board and reducing signal attenuation and insertion loss. Rogers RO4350 combines the electrical properties of PTFE / glass cloth with the processability of epoxy resin / glass, is relatively low in cost, and is easy to mass produce and multi-layer mixed pressing. Rogers RO4350 has achieved UL 94V-0 flame retardancy rating and is suitable for active devices and high-power RF designs, enhancing product safety.

[0035] In the embodiment of the present application, the impedance of the two ohmic coaxial lines 4 may be 50 ohms.

[0036] refer to Figure 4In an embodiment of the present application, the first sector dipole antenna 8 and the second sector dipole antenna 9 of the first group of radiating elements 3 have first cut angles at both vertices, and the first sector dipole antenna 8 and the second sector dipole antenna 9 of the second group of radiating elements 7 have second cut angles at both vertices. The two first cut angles and the two second cut angles form a quadrilateral, and the four vertices of the quadrilateral are open. Specifically, the first group of radiating elements 3 and the second group of radiating elements 7 are symmetrical in the upper and lower parts. The adjacent first sector dipole antenna 8 and the second sector dipole antenna 9 in the first group of radiating elements 3 or the second group of radiating elements 7 have a corner cut off at the center of each circle. In this way, a quadrilateral is formed at the center of the first group of radiating elements 3 or the second group of radiating elements 7, and the four vertices of the quadrilateral have four openings. This leaves enough space for the first feed balun 5 and the second feed balun 6.

[0037] refer to Figure 4 In an embodiment of the present application, the first feed balun 5 and the first sub-feed balun 601 are both Y-shaped, and the V-shaped open end of the first feed balun 5 is connected to the first cut corner of the first sector dipole antenna 8 in the first group of radiating elements 3, and the remaining end of the first feed balun 5 is connected to the first circular hole 701 of the second sector dipole of the second group of radiating elements 7. The V-shaped open end of the first sub-feed balun 601 is connected to the second cutout of the first sector dipole antenna 8 in the second group of radiating elements 7, and the remaining end is connected to the first end of the second sub-feed balun 602.

[0038] Specifically, the first feed balun 5 and the first sub-feed balun 601 are both Y-shaped, and the V-shaped open end of the first feed balun 5 is connected to the first cut corner of the first sector dipole antenna 8 in the first group of radiating elements 3, and the V-shaped open end of the first sub-feed balun 601 is connected to the second cutout of the first sector dipole antenna 8 in the second group of radiating elements 7. The remaining end of the first feed balun 5 is connected to the first circular hole 701 of the second sector dipole in the second group of radiating elements 7, the remaining end of the first sub-feed balun 601 is connected to the first end of the second sub-feed balun 602, and the second end of the third sub-feed balun 603 is connected to the first circular hole 702.

[0039] refer to Figure 2In an embodiment of the present application, each of the first sector dipole antenna 8 and the second sector dipole antenna 9 has two dipole arms, and the two dipole arms are axially symmetrical. Specifically, in an embodiment of the present application, each of the first sector dipole antenna 8 and the second sector dipole antenna 9 includes a connecting line with rectangular teeth and a connecting line without rectangular teeth, and the connecting line A with rectangular teeth and the connecting line B without rectangular teeth of the first sector dipole antenna 8 / the second sector dipole antenna 9 are connected at their respective first ends, and their second ends are respectively connected to the ends of the two dipole arms that are away from each other; the connecting lines A with rectangular teeth of the first sector dipole antenna 8 of the first group of radiators 3 and the second group of radiators are cross-connected to each other; the connecting lines A with rectangular teeth of the second sector dipole antenna 9 of the first group of radiators 3 and the second group of radiators are cross-connected to each other. The present application can achieve a 90-degree phase shift through two pairs of interdigital gaps composed of connecting lines with rectangular teeth, thereby realizing dual circular polarization, and has good circular polarization performance and a wider 3dB axial ratio beam, overcoming the shortcomings of existing dual circular polarization antenna technology, making the antenna unit structure simple, simple to process, and low in processing cost.

[0040] Implementation examples:

[0041] This application uses HFSS simulation software to design Figure 1 The antenna model is simulated and the simulation results are as follows Figures 6-10 shown.

[0042] The S parameters of the antenna are as follows Figure 6 As shown in the figure, the return losses |S11| and |S22| are both less than -10dB throughout the entire operating frequency band, and the port isolation |S21| is higher than 15dB.

[0043] The gain of the antenna in the entire working frequency band is as follows: Figure 7 As shown, the overall performance is greater than 6dB, and the upper axis ratio is less than 1.5dB in the entire operating frequency band.

[0044] The axial ratio diagram of the antenna at each frequency point is as follows Figures 8 to 10 As shown in FIG, from the axial ratio diagrams of the three frequency points of 2.2 GHz, 2.3 GHz, and 2.4 GHz, it can be seen that the angle where the axial ratio is less than 3 dB in the entire frequency band is greater than 120 degrees, which has a good axial ratio and good circular polarization characteristics.

[0045] Overall, the antenna of this application utilizes an interdigital slot composed of two parallel wires with interdigitated fingers to achieve a 90-degree phase shift, thus achieving dual circular polarization. This interdigital slot structure replaces existing bridge and series-fed structures for achieving dual circular polarization, eliminating the need for an additional feed network and simplifying antenna design and fabrication. The antenna also exhibits excellent circular polarization performance and a wide 3dB axial ratio beam.

[0046] Based on the above embodiments, the present application further provides a dual circularly polarized antenna having the wide axial ratio beam dual circularly polarized antenna unit with a simple structure provided by any of the above embodiments.

[0047] It should be understood that the dual circularly polarized antenna described in this embodiment has the same beneficial effects as those described in any of the above embodiments of the wide axial ratio beam dual circularly polarized antenna unit with a simple structure, which will not be described in detail here.

[0048] Based on the above embodiments, the present application further provides a dual circularly polarized antenna array having the dual circularly polarized antennas provided by the above embodiments.

[0049] Based on the above embodiments, the present application further provides a radar having the dual circularly polarized antenna array provided by the above embodiments.

[0050] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A wide axial ratio beam dual circular polarization antenna unit with a simple structure, characterized in that: include: A metal back cavity, a dielectric plate, a first group of radiating elements, a second group of radiating elements, a first feeding balun, a second feeding balun and two ohmic coaxial lines; A rectangular groove is provided around the inner side of the metal back cavity near the opening, and the dielectric plate is arranged in the rectangular groove; The first group of radiating elements and the second group of radiating elements are mirror-symmetrical and are both etched on the side of the dielectric plate facing the metal back cavity. The first group of radiating elements and the second group of radiating elements each include a first sector dipole antenna and a second sector dipole antenna. The two adjacent sides of the first sector dipole antenna and the second sector dipole antenna of the first group of radiating elements / the second group of radiating elements are parallel. The two adjacent sides of the first sector dipole antenna of the first group of radiating elements and the second group of radiating elements are interdigitally connected, and the two adjacent sides of the second sector dipole antenna of the first group of radiating elements and the second group of radiating elements are interdigitally connected. A circular hole is provided on the top of each of the two second sector dipole antennas, wherein the two circular holes are the first circular hole and the second circular hole respectively. The first feeding balun is etched on a surface of the dielectric plate away from the metal back cavity, wherein a first end of the first feeding balun is connected to the center of the first sector dipole antenna of the first group of radiating elements, and a second end of the first feeding balun is connected to the first circular hole of the second sector dipole antenna of the second group of radiating elements; The second feed balun includes a first sub-feed balun to a third sub-feed balun, the first sub-feed balun and the third sub-feed balun are both etched on the surface of the dielectric plate away from the metal back cavity, the second sub-feed balun is etched on the surface of the dielectric plate facing the metal back cavity, and the first end of the first sub-feed balun is connected to the center of the first sector dipole antenna of the second group of radiating elements, and the second end is connected to the first end of the second sub-feed balun through a first metal via, the second end of the second sub-feed balun is connected to the first end of the third sub-feed balun through a second metal via, and the second end of the third sub-feed balun is connected to the second circular hole of the second sector dipole antenna of the first group of radiating elements; The first ends of the two ohmic coaxial lines are respectively connected to the second ends of the two first feeding baluns and the second end of the third sub-feeding balun, and the second ends of the two ohmic coaxial lines pass through the second sector dipole antenna, the dielectric plate and the metal back cavity in sequence.

2. The wide axial ratio beam dual circularly polarized antenna unit with a simple structure according to claim 1, characterized in that: The dielectric plate is made of Rogers RO4350 high-frequency and high-speed circuit board material, and the relative dielectric constant of the dielectric plate is 3.52 to 3.

69.

3. The wide axial ratio beam dual circularly polarized antenna unit with a simple structure as claimed in claim 1, characterized in that: The impedance of the two ohmic coaxial cables is 50 ohms.

4. The wide axial ratio beam dual circularly polarized antenna unit with a simple structure as claimed in claim 1, characterized in that: The two vertex corners of the first sector dipole antenna and the second sector dipole antenna of the first group of radiating elements both have a first cut angle, and the two vertex corners of the first sector dipole antenna and the second sector dipole antenna of the second group of radiating elements both have a second cut angle. The two first cut angles and the two second cut angles form a quadrilateral, and the four vertex corners of the quadrilateral are open.

5. The wide axial ratio beam dual circularly polarized antenna unit with a simple structure as claimed in claim 1, characterized in that: The first feed balun and the first sub-feed balun are both Y-shaped, and the V-shaped open end of the first feed balun is connected to the first cut corner of the first sector dipole antenna in the first group of radiating elements, the remaining end of the first feed balun is connected to the first circular hole of the second sector dipole in the second group of radiating elements, the V-shaped open end of the first sub-feed balun is connected to the second cutout of the first sector dipole antenna in the second group of radiating elements, and the remaining end is connected to the first end of the second sub-feed balun through the first metal via.

6. The wide axial ratio beam dual circularly polarized antenna unit with a simple structure as claimed in claim 1, characterized in that: The first sector dipole antenna and the second sector dipole antenna of each of the first group of radiating elements and the second group of radiating elements each have two dipole arms, and the two dipole arms are axially symmetric.

7. The wide axial ratio beam dual circularly polarized antenna unit with a simple structure as claimed in claim 6, characterized in that: The first sector dipole antenna and the second sector dipole antenna both have a rectangular tooth connecting line and a non-rectangular tooth connecting line, and the rectangular tooth connecting line and the non-rectangular tooth connecting line of the first sector dipole antenna / the second sector dipole antenna are connected at their respective first ends, and their second ends are respectively connected to ends of the two dipole arms that are away from each other; The rectangular teeth connecting lines of the first sector dipole antennas of the first group of radiating elements and the second group of radiating elements are interdigitally connected to each other; The rectangular teeth connecting lines of the second sector dipole antennas of the first group of radiating elements and the second group of radiating elements are cross-digitally connected to each other.

8. A dual circular polarization antenna, characterized in that: A wide-axis-ratio beam dual circularly polarized antenna unit with a simple structure as claimed in any one of claims 1 to 7.

9. A dual circular polarization antenna array, characterized in that: The invention provides a dual circularly polarized antenna as claimed in claim 8.

10. A radar, characterized in that: The invention provides a dual circularly polarized antenna array as claimed in claim 9.

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