Wide axial ratio wave beam dual circularly polarized antenna unit with simple structure

Abstract

The invention discloses a wide-axial-ratio wave beam dual circularly polarized antenna unit with a simple structure, an antenna, an array and a radar, which are arranged in a metal back cavity through a dielectric plate, and adjacent sides of first fan-shaped dipole antennas and second fan-shaped dipole antennas of a first group of radiation elements and a second group of radiation elements are in interdigital connection. The first end of the first feed balun is connected with the circle center of the first fan-shaped dipole antenna, the other end of the first feed balun is connected with the circular hole of the second fan-shaped dipole antenna of the second group of radiation elements, the first end of the second feed balun is connected with the circle center of the first fan-shaped dipole antenna, and the second end of the second feed balun is connected with the circular hole of the second fan-shaped dipole antenna of the first group of radiation elements; the first ends of the two ohm coaxial lines are respectively connected with the second ends of the two first feed baluns and the second end of the third sub-feed balun, the dual-circularly-polarized antenna overcomes the defects of the existing dual-circularly-polarized antenna technology, and the antenna which is simple and compact in structure and can realize dual-circularly-polarized is provided by utilizing a special staggered finger-shaped structure.

Description

Technical Field

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

[0002] With the development of satellite communication technology and radar detection technology, a single polarization mode has been difficult to meet the requirements of tracking high-speed targets, detecting objects in various situations, or receiving signals perfectly under various polarization modes. When the frequency and polarization of the incoming wave are unknown, there may be a certain polarization loss when using a linear polarization antenna for tracking, or effective tracking cannot be performed when in cross polarization. Circularly polarized antennas can obtain the scattering polarization matrix of the target by analyzing the phase correlation of the echo signal, thereby improving the detection distance and detection accuracy; circularly polarized antenna signals can be received by antennas of any polarization, and have the advantages of anti-interference, anti-rain and fog, and anti-multipath effects. However, in order to achieve dual circular polarization, the antenna structure will become complicated and the processing difficulty of the antenna will be increased. At present, the traditional antenna technology for realizing circular polarization of antennas, whether it is a bridge structure or a series-fed structure, will increase the design difficulty, structural complexity, and practical application difficulty of the antenna. It is difficult to achieve dual circular polarization with a bridge structure and a series-fed structure to balance simplicity and performance. The assembly and welding of the antenna will become difficult, which will affect its performance during the antenna materialization process and cannot reach the ideal state.

[0003] At present, the research on dual circular polarization antennas at home and abroad uses bridge structures to achieve dual circular polarization. Some use ring bridge structures to achieve dual circular polarization, making the axial ratio bandwidth wide, the cross polarization level low, and the gain high; some use miniaturized branch 3dB bridges to achieve dual circular polarization. The use of series-fed structures to achieve dual circular polarization is also a common technology. For example, dual-frequency dual circular polarization radial slot antennas or wide-beam-width broadband dual circular polarization patch antennas all use series-fed structures, and the designed antennas have good characteristics.

[0004] However, existing technologies for realizing dual circular polarization of antennas, whether bridge structures or series-fed structures, introduce additional feeding networks, making the antenna structure complicated. Summary of the invention

[0005] The main purpose of the present 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 polarization 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 feeding balun, a second feeding balun and two ohmic coaxial lines; a rectangular groove is arranged 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 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 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, 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 feeding balun is etched on the surface of the dielectric plate away from the metal back cavity, and the first feeding 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 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, 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 center of the first sector dipole antenna of the second group of radiating elements. The center of the circle of the line, the second end of which 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 ends of the two first feed baluns and the second end of the third sub-feed balun, and the second end of each of them 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, both vertex angles of the first fan-shaped dipole antenna and the second fan-shaped dipole antenna of the first group of radiating elements have first cut angles, and both vertex angles of the first fan-shaped dipole antenna and the second fan-shaped dipole antenna of the second group of radiating elements have second cut angles, and the two first cut angles and the two second cut angles form a quadrilateral, and the four vertex angles 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 opening 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 of the second group of radiating elements, the V-shaped opening 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 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 at their first ends, and the second ends are respectively connected to 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 radiators and the second group of radiators are interdigitally connected to each other;

[0014] The rectangular teeth connecting lines of the second sector dipole antennas of the first group of radiators and the second group of radiators are interdigitally connected to each other.

[0015] To achieve the above objectives, the present application also provides a dual circular polarization antenna having the wide axial ratio beam dual circular polarization 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 circular polarization antenna array, which has the dual circular polarization antenna provided by any one of the aforementioned embodiments.

[0017] To achieve the above objectives, the present application also provides a radar having a 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, the first group of radiating elements and the second group of radiating elements both include a first fan-shaped dipole antenna and a second fan-shaped dipole antenna, and the two adjacent sides of the first fan-shaped dipole antenna and the second fan-shaped dipole antenna in the first group of radiating elements / the second group of radiating elements are parallel, the adjacent sides of the first fan-shaped dipole antennas of the first group of radiating elements and the second group of radiating elements are cross-finger connected, the adjacent two sides of the respective second fan-shaped dipole antennas have cross-finger connection, and a circular hole is provided on the top of the two second fan-shaped dipole antennas; a first feeding balun is etched on the surface of the dielectric plate away from the metal back cavity, the first end of the first feeding balun is connected to the center of the first fan-shaped dipole antenna of the first group of radiating elements, and the other end is connected to the circular hole of the second fan-shaped dipole antenna of the second group of radiating elements; The invention discloses a two-feed balun, comprising a first sub-feed balun to a third sub-feed balun, wherein 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, 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 hole, and 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 hole, 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 ends of the two ohmic coaxial lines are respectively connected to the second ends of the two first feed baluns and the second end of the third sub-feed balun, and the second ends of the two ohmic coaxial lines are sequentially passed through the second sector dipole antenna, the dielectric plate and the metal back cavity opposite to the two first feed baluns. The present invention overcomes the shortcomings of the existing dual circular polarization 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 It 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 an 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] Fig. 9 This is the axial ratio diagram at 2.3GHz frequency;

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

[0029] The realization of the purpose, 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 axial ratio beam dual circular polarization antenna unit with a simple structure, and the dual circular polarization 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; the metal back cavity 1 is provided with a rectangular groove around the inner side near the opening, and the dielectric plate 2 is arranged 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 both 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 provided with 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 provided with a first sector dipole antenna 9 and a second sector dipole antenna 9, and the first group of radiating elements 3 / the second group of radiating elements 7 are provided with a first sector dipole antenna 8 ... 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, the two adjacent sides of each second sector dipole antenna 9 have cross-fingering, and the tops of the two second sector dipole antennas 9 are each provided with a circular hole; 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 second feeding balun 6 comprises a first sub-feeding balun 601 to a third sub-feeding balun 603, wherein the first end first sub-feeding balun 601 and the third sub-feeding balun 603 are both etched on the surface of the dielectric plate 2 away from the metal back cavity 1, and the second sub-feeding 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-feeding balun 601 is connected to the center of the first sector-shaped dipole antenna 8 of the second group of radiating elements 7, and the second end is connected to the circular hole of the second sector-shaped dipole antenna 9 of the second group of radiating elements 7 through the first sub-feeding balun 601 to the third sub-feeding balun 603. 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 ends of the two ohmic coaxial lines 4 are 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 ends of the two ohmic coaxial lines pass 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 circular polarization 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 the present application is simple, and it is easy to miniaturize the antenna and process it. 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, the third sub-feed balun 603 is located on the top wall of the dielectric plate 2, and 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. In this way, the two feeding baluns can be prevented from interfering with each other and their respective impedance matching can be achieved.

[0034] In the embodiment of the present application, the dielectric plate 2 is based on 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, and 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 in the wide frequency range of 1GHz to 40GHz, with minimal changes, which can ensure that the signal transmission in the plate has good integrity and reduce signal attenuation and insertion loss. Rogers RO4350 combines the electrical properties of PTFE / glass cloth and the processability of epoxy resin / glass, with relatively low cost, easy mass production and multi-layer mixing. 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, both vertex angles of the first sector dipole antenna 8 and the second sector dipole antenna 9 of the first group of radiators 3 have first cut angles, and both vertex angles of the first sector dipole antenna 8 and the second sector dipole antenna 9 of the second group of radiators 7 have second cut angles, and the two first cut angles and the two second cut angles form a quadrilateral, and the four vertex angles of the quadrilateral are open. Specifically, the first group of radiators 3 and the second group of radiators 7 are symmetrical up and down, and the first sector dipole antenna 8 and the second sector dipole antenna 9 adjacent to each other in the first group of radiators 3 or the second group of radiators 7 are cut off at the center of each circle, so that a quadrilateral is formed in the center of the first group of radiators 3 or the second group of radiators 7, and the four vertices of the quadrilateral have four openings. In this way, enough space can be left 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 opening 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, 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 opening 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 opening 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 opening end of the first sub-feed balun 601 is connected to the second cut 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 of 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 rectangular tooth connection line and a non-rectangular tooth connection line, and the rectangular tooth connection line A and the non-rectangular tooth connection line B of the first sector dipole antenna 8 / the second sector dipole antenna 9 are connected at their respective first ends, and the second ends are respectively connected to the ends of the two dipole arms that are away from each other; the rectangular tooth connection lines A of the first sector dipole antenna 8 of the first group of radiators 3 and the second group of radiators are mutually interdigitated; the rectangular tooth connection lines A of the second sector dipole antenna 9 of the first group of radiators 3 and the second group of radiators are mutually interdigitated. The present application can achieve a 90-degree phase shift through two pairs of interdigital gaps composed of connecting wires with rectangular teeth, thereby realizing dual circular polarization, and having good circular polarization performance and a wider 3dB axial ratio beam, thus overcoming the shortcomings of existing dual circular polarization antenna technology, making the antenna unit structure simple, the processing simple, and the processing cost low.

[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 Figure 6-Figure 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 in the entire operating frequency band, and the port isolation |S21| is higher than 15dB.

[0043] The gain of the antenna in the entire operating 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, 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 at which 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] In general, the antenna of the present application uses a cross-finger slot composed of parallel double wires with cross-finger to achieve a 90-degree phase shift and realize dual circular polarization. The cross-finger slot structure replaces the existing bridge structure and series feed structure for realizing dual circular polarization, and does not introduce an additional feeding network, making the antenna simpler to design and process. At the same time, the antenna has good circular polarization performance and a wider 3dB axial ratio beam.

[0046] On the basis of the above embodiments, the present application further provides a dual circular polarization antenna having a wide axial ratio beam dual circular polarization antenna unit with a simple structure provided by any one 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 circular polarization antenna array, which has the dual circular polarization antenna provided by the above embodiments.

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

[0050] The above are only preferred embodiments of the present application, and are not intended to 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 arranged 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 radiators and the second group of radiators are mirror-symmetrical and are both etched on the side of the dielectric plate facing the metal back cavity. The first group of radiators and the second group of radiators each include a first sector-shaped dipole antenna and a second sector-shaped dipole antenna. The two adjacent sides of the first sector-shaped dipole antenna and the second sector-shaped dipole antenna of the first group of radiators / the second group of radiators are parallel. The two adjacent sides of the first sector-shaped dipole antenna of the first group of radiators and the second group of radiators are cross-connected, and the two adjacent sides of the second sector-shaped dipole antenna of the first group of radiators and the second group of radiators are cross-connected. A circular hole is provided on the top of each of the two second sector-shaped dipole antennas. The first feeding balun is etched on the surface of the dielectric plate away from the metal back cavity, the 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 the second end is connected to the first circular hole of the second sector dipole antenna of the second group of radiating elements; The second feeding balun includes a first sub-feeding balun to a third sub-feeding balun, the first sub-feeding balun and the third sub-feeding balun are both etched on the surface of the dielectric plate away from the metal back cavity, the second sub-feeding balun is etched on the surface of the dielectric plate facing the metal back cavity, and the first end of the first sub-feeding balun is connected to the center of the first sector-shaped dipole antenna of the second group of radiating elements, and the second end is connected to the first end of the second sub-feeding balun through a first metal via, the second end of the second sub-feeding balun is connected to the first end of the third sub-feeding balun through a second metal via, and the second end of the third sub-feeding balun is connected to the second circular hole of the second sector-shaped 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 circular polarization antenna unit with a simple structure as claimed in 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 circular polarization antenna unit with a simple structure as claimed in claim 1, characterized in that: The impedance of the two ohmic coaxial lines is 50 ohms.

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

5. The wide axial ratio beam dual circular polarization 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 opening 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 of the second group of radiating elements, the V-shaped opening 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 circular polarization antenna unit with a simple structure as claimed in claim 1, characterized in that: The first sector-shaped dipole antenna and the second sector-shaped 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 circular polarization 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 connection line and a non-rectangular tooth connection line, and the rectangular tooth connection line and the non-rectangular tooth connection line of the first sector dipole antenna / the second sector dipole antenna are connected at their respective first ends, and the second ends are respectively connected to the 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 radiators and the second group of radiators are interdigitally connected to each other; The rectangular teeth connecting lines of the second sector dipole antennas of the first group of radiators and the second group of radiators are interdigitally connected to each other.

8. A dual circular polarization antenna, characterized in that: A wide axial ratio beam dual circular polarization 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: A dual circularly polarized antenna as claimed in claim 8.

10. A radar, characterized in that: A dual circularly polarized antenna array is provided as claimed in claim 9.

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