Dual circularly polarized antenna unit and satellite-borne phased-array antenna

Abstract

The invention relates to the technical field of antennas, in particular to a dual-circularly-polarized antenna unit and a satellite-borne phased-array antenna, and the dual-circularly-polarized antenna unit comprises a single-layer feed dielectric plate; and two feed ports. A four-feed-point power division network circuit; a 3dB bridge circuit; the dipole radiation unit comprises a radiation panel which is in a plate shape as a whole; the radiation arm is arranged at the edge of the radiation panel, and the radiation arm is arranged in a bending manner; the upper end of each feed pin is connected to the radiation panel, and the lower end of each feed pin is connected to the corresponding bonding pad outlet. According to the dipole antenna, the single-layer feed dielectric plate is arranged, the four-point feed power division network circuit and the first microstrip line and the feeder line of the 3dB bridge circuit are subjected to snakelike routing design and miniaturization processing, and the radiation arms of the dipole radiation units are also subjected to three-dimensional folding miniaturization arrangement, so that the height and the radiation aperture of the dipole antenna are reduced; the height of the antenna is only 0.125 wavelengths of a central frequency point.

Description

Technical Field

[0001] The present disclosure relates to the field of antenna technology, and particularly to a dual-circularly polarized antenna element and a spaceborne phased array antenna. Background Art

[0002] 6G can utilize space-based means to achieve coverage in remote terrestrial areas, at sea, and in the air, and ultimately build a space-ground integrated mobile communication network. In the context of space-ground integration, higher requirements are put forward for dual-circularly polarized spaceborne phased array antennas that can achieve a common aperture for transmission and reception. However, in the field of satellites where there are high requirements for the structural strength, anti-radiation, and resistance to high and low temperatures of the antenna, there are problems such as low antenna gain, narrow bandwidth, high processing difficulty, complex feeder network design, and difficulty in miniaturization. Summary of the Invention

[0003] To overcome the problems existing in the related art, a first aspect of an exemplary embodiment of the present disclosure provides a dual-circularly polarized antenna element, including: a single-layer feeding dielectric plate; two feeding ports provided on the single-layer feeding dielectric plate; a four-feed-point power division network circuit provided on the upper side of the single-layer feeding dielectric plate, including four pad outlets and four microstrip lines respectively communicating with each of the pad outlets; a 3dB hybrid circuit provided on the lower side of the single-layer feeding dielectric plate, including four ports, wherein the first port and the fourth port are respectively connected to the feeding ports, and the second port and the third port are respectively connected to the microstrip lines of the four-feed-point power division network circuit, so as to be electrically conductive with the four pad outlets; a dipole radiation unit provided above the single-layer feeding dielectric plate for generating dual-circularly polarized waves through feeding, and the dipole radiation unit includes: a radiation panel, which is integrally plate-shaped; radiation arms provided at the edge of the radiation panel, and the radiation arms are bent; and four feeding pins, each of the feeding pins is connected to the radiation panel at the upper end and to the corresponding pad outlet at the lower end.

[0004] In some embodiments, the radiation arms are integrally bent plate-shaped and are arranged below the radiation panel through at least one bend.

[0005] In some embodiments, the radiation arms include: a first vertical plate, the upper end of which is connected to the side of the radiation panel and extends downward as a whole; a first horizontal plate, the outer end of which is connected to the lower end of the first vertical plate and extends towards the inside of the radiation panel, and the inner end opposite to the outer end of the first horizontal plate is located below the radiation panel; a second vertical plate, the upper end of which is connected to the inner end of the first horizontal plate and extends downward as a whole; a second horizontal plate, the inner end of which is connected to the lower end of the second vertical plate and extends towards the outside of the radiation panel, and the outer end opposite to the inner end of the second horizontal plate does not exceed the vertical projection area of the radiation panel.

[0006] In some embodiments, the radiation panel is generally rectangular; the dipole radiation unit includes four radiation arms respectively disposed on the rectangular sides of the radiation panel.

[0007] In some embodiments, four rectangular through holes are provided on the radiation panel, and the four rectangular through holes are respectively disposed inside the sides of the radiation panel.

[0008] In some embodiments, the length of the rectangular through hole is 9.8 mm - 10 mm, and the width of the rectangular through hole is 5.8 mm - 6.2 mm.

[0009] In some embodiments, four rectangular grooves are provided on the radiation panel, which are arranged at intervals from the four rectangular through holes, and one end of each of the four rectangular grooves is close to the upper ends of the four feeding pins.

[0010] In some embodiments, the four-feed-point power division network circuit includes: a first microstrip line, one end of which is connected to the first pad outlet and the other end of which is connected to the second port of the 3 dB bridge circuit; a third microstrip line, one end of which is connected to the third pad outlet and the other end of which is connected to the first microstrip line, and the length from the first pad outlet to the connection point of the first microstrip line and the third microstrip line is less than the length of the third microstrip line; a fourth microstrip line, one end of which is connected to the fourth pad outlet and the other end of which is connected to the third port of the 3 dB bridge circuit; a second microstrip line, one end of which is connected to the second pad outlet and the other end of which is connected to the fourth microstrip line, and the length from the fourth pad outlet to the connection point of the second microstrip line and the fourth microstrip line is less than the length of the second microstrip line.

[0011] In some embodiments, the second microstrip line includes one or more bent segments such that the signal phase difference between the first pad outlet and the third pad outlet is 180 degrees; and / or, the third microstrip line includes one or more bent segments such that the signal phase difference between the fourth pad outlet and the second pad outlet is 180 degrees.

[0012] In some embodiments, the 3 dB bridge circuit includes four feed lines, wherein: a first feed line, one end of which is connected to the first port and the other end of which is connected to the second port; a second feed line, one end of which is connected to the second port and the other end of which is connected to the third port; a third feed line, one end of which is connected to the third port and the other end of which is connected to the fourth port, and the third feed line makes a jump wire above the second microstrip line to avoid the second microstrip line; a fourth feed line, one end of which is connected to the first feed line and the other end of which is connected to the third feed line.

[0013] In some embodiments, the dual circular polarization antenna unit further includes: a cavity, which is integrally cylindrical and includes: a bottom plate disposed below the single-layer feeding dielectric plate; a side wall, the bottom end of which is connected to the periphery of the bottom plate and extends upward, and is disposed outside the single-layer feeding dielectric plate and the dipole radiation unit.

[0014] In some embodiments, the single-layer feeding dielectric plate includes a plurality of first through holes, and the first through holes are arranged to avoid the four-feed-point power distribution network circuit and the 3dB bridge circuit; the radiation panel is provided with a plurality of second through holes corresponding to the plurality of first through holes; the dual circular polarization antenna unit further includes: an antenna cover disposed above the radiation panel; and a plurality of support columns, the bottom end of each support column is connected to the bottom plate, and respectively passes through the first through hole and the second through hole in sequence, and the top end is connected to the antenna cover.

[0015] In some embodiments, the antenna cover is located at the top or middle of the side wall.

[0016] In a second aspect, the present disclosure also provides a spaceborne phased array antenna, including a plurality of dual circular polarization antenna units as described in the first aspect, and the plurality of dual circular polarization antenna units are arrayed to radiate together.

[0017] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure.

[0018] The present disclosure provides a dual circular polarization antenna unit and a spaceborne phased array antenna. Among them, the dual circular polarization antenna unit integrates the four-feed-point power distribution network circuit and the 3dB bridge circuit on a single-layer feeding dielectric plate, and the circuit routing design of the four-feed-point power distribution network circuit and the 3dB bridge circuit is more reasonable, realizing miniaturization, greatly reducing the design and manufacturing difficulty, and at the same time reducing the dielectric loss, achieving the effects of high gain and low axial ratio. At the same time, the radiation arms of the dipole radiation unit are also bent to reduce the height and radiation aperture of the dipole antenna, and the antenna height can be realized as 0.125 wavelengths of the center frequency point. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By describing the exemplary embodiments of the present disclosure in conjunction with the drawings, the present disclosure can be better understood. In the drawings:

[0020] Figure 1 is a schematic diagram of a dual circular polarization antenna unit shown according to an exemplary embodiment of the disclosure;

[0021] Figure 2 is a schematic diagram of a dual circular polarization antenna unit shown according to another exemplary embodiment of the disclosure;

[0022] Figure 3 is a schematic diagram of a dual - circularly polarized antenna element shown according to another disclosed exemplary embodiment;

[0023] Figure 4 is a schematic diagram of a dual - circularly polarized antenna element shown according to another disclosed exemplary embodiment;

[0024] Figure 5 is a schematic diagram of a dual - circularly polarized antenna element shown according to another disclosed exemplary embodiment;

[0025] Figure 6 is a schematic diagram of a dual - circularly polarized antenna element shown according to another disclosed exemplary embodiment;

[0026] Figure 7 is a schematic diagram of a dual - circularly polarized antenna element shown according to another disclosed exemplary embodiment;

[0027] Figure 8 is a schematic diagram of a dual - circularly polarized antenna element shown according to another disclosed exemplary embodiment;

[0028] Figure 9 is a schematic diagram of a dual - circularly polarized antenna element shown according to another disclosed exemplary embodiment;

[0029] Figure 10 is a standing - wave ratio - frequency graph shown according to another disclosed exemplary embodiment;

[0030] Figure 11 is an axial - ratio radiation pattern shown according to another disclosed exemplary embodiment;

[0031] Figure 12 is a gain - frequency graph shown according to another disclosed exemplary embodiment;

[0032] Figure 13 is a gain radiation pattern shown according to another disclosed exemplary embodiment. Detailed implementation manners

[0033] Specific embodiments of the present disclosure will be described below. It should be noted that in the specific description of these embodiments, for the sake of concise description, this specification may not describe all features of the actual embodiments in detail. It should be understood that in the actual implementation process of any embodiment, just as in the process of any engineering project or design project, various specific decisions are often made to achieve the specific goals of the developer and to meet system-related or business-related restrictions, and this also changes from one embodiment to another. In addition, it should also be understood that although the efforts made in this development process may be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present invention, some design, manufacturing, or production changes based on the technical content disclosed in the present disclosure are only conventional technical means and should not be understood as insufficient content of the present disclosure.

[0034] Unless otherwise defined, technical terms or scientific terms used in the claims and the specification should have the ordinary meanings understood by those of ordinary skill in the technical field to which the present invention pertains. The terms "first", "second", and similar terms used in the specification and claims of this patent application do not denote any order, quantity, or importance, but are only used to distinguish different components. The terms "a" or "an" and similar terms do not denote a quantity limitation, but rather denote the presence of at least one. The terms "comprising" or "including" and similar terms are intended to mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalent elements, and do not exclude other elements or items. The terms "connected" or "coupled" and similar terms are not limited to physical or mechanical connections, nor are they limited to direct or indirect connections.

[0035] The related technologies for achieving dual circular polarization at home and abroad can be roughly divided into two categories: The first is to introduce a 90° phase difference in a dual-polarized antenna through a 3dB bridge to achieve dual circular polarization. The second is to introduce current perturbation through the structural change of two independent radiation units to achieve dual circular polarization. In addition, for the form of the radiation unit, there are mainly microstrip patch antennas, orthogonal dipole antennas, etc. at present. However, there are still many problems to be solved in the above two technologies for achieving dual circular polarization and the form of the radiation unit. First, for the first antenna technology combining a 3dB bridge with multi-point feeding, at present, a multi-layer dielectric board is mainly used to design the radiation unit and the feeding network. This method is complex in design and processing, has large dielectric losses, and is not conducive to large-scale manufacturing. Second, for the second technology for achieving dual circular polarization through perturbation, the circular polarization axial ratio performance formed by this method is poor, the axial ratio bandwidth is narrow, and it is not easy to construct a low axial ratio broadband phased array antenna. Third, regardless of which of the above technical routes is adopted, there is still room for improvement in the design of the radiation unit at home and abroad. The existing microstrip patch antennas have low gain and narrow bandwidth, and the existing orthogonal dipole antennas are large in size, high in profile, and heavy in weight. Fourth, at present, the relevant patent documents at home and abroad are lacking in engineering practicability. The structural designs of many solutions cannot meet engineering applications, especially in the satellite field where high requirements are imposed on the structural strength, anti-radiation, and resistance to high and low temperatures of the antenna.

[0036] In some related technologies, the antenna is provided with four layers of dielectric boards, which are stacked from top to bottom as the guiding patch layer, the radiation patch layer, the four-feed power division network layer, and the 3dB bridge layer in sequence. Although this design achieves good dual circular polarization performance, undoubtedly, the antenna has low gain, narrow bandwidth, complex multi-layer board design, and great processing difficulty. In some other related technologies, dual circular polarization is achieved by combining an orthogonal dipole with a 3dB bridge. However, usually, the height of the dipole is 0.25 wavelengths at the center frequency point, and this antenna is no exception. The antenna height is 18mm, which is about 0.23 wavelengths of the center frequency point of 3.8GHz, resulting in a relatively high antenna profile and not being conducive to miniaturized design.

[0037] To overcome the problems existing in the related technologies, the exemplary embodiments of the present disclosure avoid using the microstrip patch form and provide a dual circular polarization antenna unit 100, as Figure 1 shown, including: a single-layer feeding dielectric board 110, two feeding ports 120, a four-feed point power division network circuit 130, a 3dB bridge circuit 140, and a dipole radiation unit 150.

[0038] The single-layer feeding dielectric board 110, as Figure 1As shown, the feeding dielectric plate 110 can be made of a high-frequency low-loss dielectric substrate, such as RO4350 high-frequency board, with a stable dielectric constant and suitable for the millimeter-wave band. The feeding dielectric plate 110 can be provided with a single layer, on which two feeding ports 120, a four-feed-point power divider network circuit 130 and a 3dB hybrid circuit 140 can be integrated.

[0039] The two feeding ports 120, as Figure 1 、 Figure 7 shown, can be arranged on the single-layer feeding dielectric plate 110. Two feeding ports 120 can be arranged on the single-layer feeding dielectric plate 110. The two feeding ports 120 can introduce radio frequency signals from a transmitter into the dipole radiation unit 150, or receive signals from the dipole radiation unit 150 to a receiver. The two feeding ports 120 can determine their positions according to the circuit settings of the 3dB hybrid circuit 140, and then adjust the phase difference of the signals to achieve circular polarization.

[0040] The four-feed-point power divider network circuit 130, as Figure 1 、 Figure 7 shown, can be arranged on the upper side of the single-layer feeding dielectric plate 110, and can include four pad outlets 131 and four microstrip lines 132 respectively connected to each pad outlet 131. The four-feed-point power divider network circuit 130 is a four-way power divider that can equally divide or proportionally distribute the input signal to the four pad outlets 131. The four pad outlets 131 can be arranged evenly and symmetrically, and can be arranged at the four vertices of a square, integrated on the upper side of the single-layer feeding dielectric plate 110, which is beneficial to circuit connection and signal transmission, and the single-layer feeding dielectric plate 110 is relatively simple, facilitating processing and manufacturing. The four pad outlets 131 are interfaces for the circuit to connect with external devices or other circuits, and signals can be input or output from the power divider network through the four pad outlets 131. The four microstrip lines 132 are respectively connected to each pad outlet 131. As microwave transmission lines, microstrip lines have the advantages of small volume, light weight and easy integration. The four microstrip lines 132 can transmit signals from one position to another to achieve the signal distribution function of the power divider network. The four microstrip lines 132 can be bent. When each microstrip line 132 is bent, it can be bent separately so that the phase difference of the signals reaching the two pad outlets 131 at two opposite diagonal points is 180 degrees to achieve circular polarization. The four microstrip lines 132 can be designed with jumpers, which can avoid mutual interference between lines, save space on the single-layer feeding dielectric plate 110, and is beneficial to miniaturization.

[0041] The 3dB hybrid circuit 140, as Figure 1 、 Figure 7As shown, it can be disposed on the lower side of the single-layer feeding dielectric plate 110 and can include four ports 141. Among them, the first port 1411 and the fourth port 1414 can be respectively connected to the feeding port 120, and the second port 1412 and the third port 1413 can be respectively connected to the microstrip lines of the four-feed-point power divider network circuit 130, so as to be electrically conductive with the four pad outlets 131. The four feed lines 142 and the four ports in the 3dB bridge circuit 140 can be integrated on the lower side of the single-layer feeding dielectric plate 110. The four feed lines 142 in the 3dB bridge circuit 140 can be respectively bent. When each feed line is bent, it can also be bent separately, which can save the space of the single-layer feeding dielectric plate 110. The four ports 141 can be respectively connected to the feeding port and the microstrip lines of the four-feed-point power divider network circuit 130. The first port 1411 and the fourth port 1414 can be respectively connected to the feeding port 120, so that the signal of the transmitter can be transmitted to the first port 1411 and the fourth port 1414, and transmitted to the second port 1412 and the third port 1413 through the feed lines. Since the second port 1412 and the third port 1413 are respectively connected to the microstrip lines of the four-feed-point power divider network circuit 130, the signal can be transmitted to the four-feed-point power divider network circuit 130. Through the four microstrip lines 132, the signal can be transmitted to the four pad outlets 131. At this time, the phase difference between the two pad outlets 131 reaching two corresponding diagonal points is 180 degrees, which can feed the dipole radiation unit 150, so that the dipole radiation unit 150 forms a dual circularly polarized wave.

[0042] The dipole radiation unit 150, such as Figure 1 , Figure 6 As shown, it can be disposed above the single-layer feeding dielectric plate 110 and can be used to generate a dual circularly polarized wave through feeding. The dipole radiation unit 150 can include: a radiation panel 151, radiation arms 152, and four feeding pins 153. The dipole radiation unit 150 can be disposed above the single-layer feeding dielectric plate 110. The four feeding pins 153 of the dipole radiation unit 150 can be correspondingly connected to the four pad outlets 131, so that the signals of the four pad outlets 131 can be fed to the four feeding pins 153, so that the dipole radiation unit 150 forms a dual circularly polarized wave.

[0043] The radiation panel 151, such as Figure 1 , Figure 6As shown, the whole can be in a plate shape. The radiation panel 151 can be rectangular or circular and can be in a plate-like structure. A plurality of hollow openings can be provided on the radiation panel 151. The plurality of hollow openings can be evenly and symmetrically arranged on the radiation panel 151 and can be rectangular, circular, etc. The plurality of hollow openings can change the current distribution on the radiation panel 151, increase the capacitance, and increase the bandwidth of the antenna. A plurality of through holes can be provided on the radiation panel 151, and support columns can be provided to increase the stability of the radiation panel 151.

[0044] The radiation arm 152, as Figure 1 , Figure 6 shown, can be provided at the edge of the radiation panel 151, and the radiation arm 152 can be bent. A plurality of radiation arms 152 can be symmetrically arranged and can be provided at the edge of the radiation panel 151. In some scenarios, the radiation panel 151 can be rectangular, and four radiation arms 152 can be provided and can be arranged at the four edge positions of the rectangular radiation panel 151. It can be in a plate-like structure and can utilize the field enhancement effect at the edge of the radiation panel 151 to improve the radiation efficiency. The radiation arm 152 can be bent, and can be bent once or multiple times. Multiple bends can increase the equivalent capacitance and can reduce the height and radiation aperture of the antenna. The bending angle can be 60 - 120 degrees, and can be 90 degrees. The width and length of the bend can also be determined according to the specific dimensions of the radiation panel 151. Increasing the width of the bend of the radiation arm 152 can increase the capacitance, thereby forming a resonant circuit and further expanding the bandwidth. The bending of the radiation arm 152 at the edge of the radiation panel 151 can match the current distribution at the edge of the radiation panel 151, reduce reflection, and improve the standing wave ratio.

[0045] Four feeding pins 153, as Figure 6 shown, the upper end of each feeding pin 153 can be connected to the radiation panel 151, and the lower end is connected to the corresponding pad outlet 131. The four feeding pins 153 can be symmetrically and evenly arranged and can be arranged at the four corners of a square corresponding to the four pad outlets. The upper end of each feeding pin 153 can be vertically connected to the radiation panel 151, and the lower end can be vertically connected to the corresponding pad outlet 131. The four feeding pins 153 can receive the signals from the corresponding four pad outlets 131 and transmit the signals to the radiation panel 151 and the radiation arm 152 for antenna radiation, thereby forming a dual circularly polarized wave.

[0046] In the embodiments of the present disclosure, a dual-circularly polarized antenna unit 100 is provided. By integrating a four-point feeding power division network circuit 130, a 3 dB hybrid circuit 140, and two feeding ports 120 on a single-layer feeding dielectric board 110, and miniaturizing the microstrip lines and feed lines of the four-point feeding power division network circuit 130 and the 3 dB hybrid circuit 140 through reasonable routing, the design and manufacturing difficulty are greatly reduced. At the same time, the dielectric loss is reduced, achieving the effects of high gain and low axial ratio. Meanwhile, the radiation arms 152 of the dipole radiation unit 150 are bent to achieve miniaturization, reducing the height and radiation aperture of the dipole antenna. The antenna height is only 0.125 wavelengths of the center frequency point.

[0047] In some embodiments, the radiation arms 152 as a whole can be in a bent plate shape, such as Figure 6 shown, and can be disposed below the radiation panel 151 through at least one bend. The radiation arms 152 are in a bent plate-shaped structure below the radiation panel 151. The radiation arms 152 can be a bent plate-shaped structure with one bend, arranged in an L shape below the radiation panel 151 to achieve miniaturization, save space, introduce distributed inductance and capacitance at the bend, form additional resonance points, expand the bandwidth, or support multi-band operation (not only support low-frequency operation but also support high-frequency operation). The radiation arms 152 can also be a bent plate-shaped structure with two bends, which can be in a U shape or a Z shape, and can be further miniaturized by extending the surface current path and reducing the resonance frequency. The radiation arms 152 can also be a bent plate-shaped structure with three bends, further achieving miniaturization and reducing the height and radiation aperture of the antenna.

[0048] In the embodiments of the present disclosure, by setting the radiation arms 152 as at least one bent plate-shaped structure and disposing them below the radiation panel 151, it is possible to prevent the radiation arms from extending outward to increase the radial size of the antenna, reduce the height and radiation aperture of the antenna, achieve miniaturization, save space, expand the bandwidth, and support not only low-frequency operation but also high-frequency operation.

[0049] In some embodiments, such as Figure 6 shown, the radiation arms 152 may include: a first vertical plate 1521, a first horizontal plate 1522, a second vertical plate 1523, and a second horizontal plate 1524. The connection between the four plates of the radiation arms 152 can be by welding or integrally formed.

[0050] The first vertical plate 1521, such as Figure 6As shown, the upper end can be connected to the side of the radiation panel 151 and can extend downward as a whole; the first horizontal plate 1522, the outer end of which can be connected to the lower end of the first vertical plate 1521, can extend toward the inside of the radiation panel 151, and the inner end opposite to the outer end of the first horizontal plate 1522 is located below the radiation panel 151. The upper end of the first vertical plate 1521 can be connected to the side of the radiation panel 151, and after extending downward as a whole, it can be connected to the outer end of the first horizontal plate 1522. The first horizontal plate 1522 can extend inward (toward the center of the radiation panel 151), and the first horizontal plate 1522 is vertically lower than the bottom surface of the radiation panel 151.

[0051] The second vertical plate 1523, as Figure 6 shown, the upper end of which can be connected to the inner end of the first horizontal plate 1522 and can extend downward as a whole; the second horizontal plate 1524, the inner end of which can be connected to the lower end of the second vertical plate 1523, can extend toward the outside of the radiation panel 151, and the outer end opposite to the inner end of the second horizontal plate 1524 does not exceed the vertical projection area of the radiation panel 151. The upper end of the second vertical plate 1523 can be connected to the inner end of the first horizontal plate 1522 and also extends downward as a whole. The second horizontal plate 1524, the inner end of which can be connected to the lower end of the second vertical plate 1523, extends outward but does not exceed the horizontal range of the radiation panel 151, can maintain a compact structure, and can perform effective radiation.

[0052] In the embodiments of the present disclosure, by setting the radiation arm 152 as a four-plate structure with three folds, which is equivalent to three bends of the radiation arm 152, the area of the radiation arm is extended within a limited space, and the radiation arm is kept in the space below the radiation panel 151, avoiding expanding the radial size of the antenna. It can be further miniaturized and save space. By extending the surface current path, the resonant frequency is reduced, and the height and radiation aperture of the antenna can be further reduced.

[0053] In some embodiments, as Figure 1 、 Figure 6 shown, the radiation panel 151 can be rectangular as a whole; the dipole radiation unit 150 can include four radiation arms 152, which can be respectively arranged on the rectangular sides of the radiation panel 151. The radiation panel 151 can be rectangular, and four radiation arms 152 can be provided, which can be arranged at the four edge positions of the rectangular radiation panel 151 and can be plate-like structures. In the embodiments of the present disclosure, four radiation arms 152 can be arranged on the four sides of the rectangular radiation panel 151. By using the field enhancement effect at the edge of the radiation panel 151, the radiation efficiency is improved, and the design and manufacturing difficulty is reduced, and the effects of high gain and low axial ratio can be achieved.

[0054] In some embodiments, as Figure 2 、 Figure 3As shown in the figure, four rectangular through-holes 1512 can be provided on the radiation panel 151, and the four rectangular through-holes 1512 can be respectively arranged inside the side edges of the radiation panel 151. The through-holes 1512 on the radiation panel 151 can be rectangular and can be set to four. The four rectangular through-holes 1512 can be evenly and symmetrically arranged inside the side edges of the radiation panel 151, so that the surface current of the radiation panel 151 flows around the edges of the four rectangular through-holes 1512, extending the effective current path and equivalently increasing the inductance. The four symmetrical through-holes 1512 can be used to balance the electromagnetic field and reduce the cross polarization caused by asymmetry. In the embodiments of the present disclosure, by providing four rectangular through-holes on the inner side of the radiation panel 151, the radiation efficiency can be improved, the capacitive reactance can be increased, the bandwidth can be extended, and the impedance matching can be optimized. The four symmetrically arranged rectangular through-holes 1512 can optimize the dual circular polarization performance, with higher gain, uniform radiation, and wider beam. And the rectangular through-holes are simple to manufacture and cost-saving.

[0055] In some embodiments, the length of the rectangular through-hole 1512 can be 9.8 mm - 10 mm, and the width of the rectangular through-hole 1512 can be 5.8 mm - 6.2 mm. The size of the rectangular through-hole 1512 can be set according to the size of the radiation panel 151. The length of the rectangle can be 9.8 mm - 10 mm, and the width can be 5.8 mm - 6.2 mm. In some scenarios, a phased array unit with an operating frequency of 1.71 - 1.88 GHz is set.

[0056] As Figure 10 shown in the figure, the curves in the figure are the curves of the standing wave ratio of the end point 1 and the end point 2 changing with the frequency. It can be seen that the standing wave is less than 1.3 within the entire frequency band.

[0057] As Figure 11 shown in the figure, the curve in the figure is the curve of the axial ratio changing with the frequency. It can be seen that the axial ratio is less than 1.7 dB.

[0058] As Figure 12 shown in the figure, the curve in the figure is the curve of the gain changing with the frequency. As Figure 13 shown in the figure, the curves in the figure are the gain pattern diagrams at 1.71 GHz, 1.8 GHz, and 1.88 GHz respectively. It can be seen that the 3 dB beamwidth range is 84 - 90 degrees, and the gain range is 6.3 - 6.6 dBi, which can meet the requirements of high-gain wide-angle scanning of the phased array antenna.

[0059] In the embodiments of the present disclosure, by setting the sizes of the four rectangular through-holes, the dual circular polarization performance can be optimized, with higher gain, uniform radiation, and wider beam. A relatively wide gain bandwidth (Gain ≥ 5 dBi bandwidth is 19%), impedance bandwidth (S11 ≤ -10 dB impedance bandwidth is 27%), and axial ratio bandwidth (AR ≤ 3 dB bandwidth is 18%) are achieved. Each performance index is good and can meet the requirements of the spaceborne phased array antenna unit.

[0060] In some embodiments, as Figure 2 , Figure 3 shown, four rectangular grooves 1511 may be provided on the radiation panel 151, which may be arranged at intervals from four rectangular through holes 1512. One end of the four rectangular grooves 1511 may be arranged close to the upper ends of the four feeding pins 153. The four rectangular grooves 1511 may be arranged according to the size of the radiation panel 151. By providing four rectangular grooves 1511 on the radiation panel 151 and arranging them at intervals from the four rectangular through holes 1512, a tortuous current path may be formed on the radiation panel 151, thereby expanding the bandwidth of the antenna and adjusting the resonant frequency. One end of the groove 1511 is arranged close to the four feeding pins 153, which may enhance the electromagnetic coupling between the four-feed-point power division network circuit 130 and the radiation panel 151, and further improve the feeding efficiency. The four rectangular grooves may reduce the weight of the radiation panel and maintain the stiffness of the structure. In the embodiments of the present disclosure, by providing four rectangular grooves 1511 on the radiation panel 151, the current distribution may be adjusted, the coupling may be reduced, and by arranging them close to the four feeding pins 153 respectively, the impedance matching may be optimized and the signal transmission efficiency may be improved.

[0061] In some embodiments, as Figure 7 shown, the four-feed-point power division network circuit 130 may include: a first microstrip line 1321, a third microstrip line 1323, a fourth microstrip line 1324, and a second microstrip line 1322.

[0062] The first microstrip line 1321, as Figure 7 shown, one end may be connected to the first pad outlet 1311, and the other end may be connected to the second port 1412 of the 3dB bridge circuit; the third microstrip line 1323, one end may be connected to the third pad outlet 1313, and the other end may be connected to the first microstrip line 1321, and the length from the first pad outlet 1311 to the connection point of the first microstrip line 1321 and the third microstrip line 1323 may be less than the length of the third microstrip line 1323. The first pad outlet 1311 and the second port 1412 of the 3dB bridge circuit may be respectively arranged at both ends of the first microstrip line 1321, and the third pad outlet 1313 and the first microstrip line 1321 may be respectively arranged on the third microstrip line 1323. The length of the third microstrip line 1323 may be greater than the length from the first pad outlet 1311 to the connection point of the first microstrip line 1321 and the third microstrip line 1323. Such a distance difference may make the phase difference of the signals reaching the first pad outlet 1311 and the third pad outlet 1313 be 180 degrees.

[0063] The fourth microstrip line 1324, as Figure 7As shown, one end can be connected to the fourth pad exit 1314, and the other end can be connected to the third port 1413 of the 3 dB bridge circuit; the second microstrip line 1322, one end can be connected to the second pad exit 1312, and the other end can be connected to the fourth microstrip line 1324, and the length from the fourth pad exit 1314 to the connection point of the second microstrip line 1322 and the fourth microstrip line 1324 can be less than the length of the second microstrip line 1322. The fourth pad exit 1314 and the third port 1413 of the 3 dB bridge circuit can be arranged at both ends of the fourth microstrip line 1324, and the second pad exit 1312 and the fourth microstrip line 1324 can be respectively arranged at both ends of the second microstrip line 1322. The length of the second microstrip line 1322 can be greater than the length from the fourth pad exit 1314 to the connection point of the second microstrip line 1322 and the fourth microstrip line 1324, and such a distance difference can make the phase difference of the signal reaching the fourth pad exit 1314 and the second pad exit 1312 be 180 degrees.

[0064] In the embodiments of the present disclosure, making the length of the third microstrip line 1323 greater than the length from the first pad exit 1311 to the connection point of the first microstrip line 1321 and the third microstrip line 1323, and making the length of the second microstrip line 1322 greater than the length from the fourth pad exit 1314 to the connection point of the second microstrip line 1322 and the fourth microstrip line 1324 can make the phase difference of the signal reaching the first pad exit 1311 and the third pad exit 1313 be 180 degrees, and make the phase difference of the signal reaching the fourth pad exit 1314 and the second pad exit 1312 be 180 degrees, and can feed the signal to the dipole radiation unit 150, so that the dipole radiation unit 150 forms a dual circularly polarized wave.

[0065] In some embodiments, such as Figure 7As shown, the second microstrip line 1322 may include one or more bent segments, which can make the signal phase difference between the first pad outlet 1311 and the third pad outlet 1313 be 180 degrees; or the third microstrip line 1323 may include one or more bent segments, which can make the signal phase difference between the fourth pad outlet 1314 and the second pad outlet 1312 be 180 degrees. The second microstrip line 1322 may include one or more bent segments, which can make the signal phase difference between the first pad outlet 1311 and the third pad outlet 1313 be 180 degrees and the third microstrip line 1323 may include one or more bent segments, which can make the signal phase difference between the fourth pad outlet 1314 and the second pad outlet 1312 be 180 degrees. In some scenarios, one bend can be provided on the second microstrip line 1322, two bends can be provided, or multiple bends can be provided. Two or more bends can be continuous or dispersed. The bends can be made according to the specific position and situation of the circuit. The bends can increase the length of the second microstrip line 1322 and can make the signal phase difference between the first pad outlet 1311 and the third pad outlet 1313 be 180 degrees. While achieving a 180-degree signal phase difference between the first pad outlet 1311 and the third pad outlet 1313, one or more bends can save the space of the single-layer feed dielectric board 110. Or one bend can be provided on the third microstrip line 1323, two bends can be provided, or multiple bends can be provided. The bends can increase the length of the third microstrip line 1323. The signal phase difference between the fourth pad outlet 1314 and the second pad outlet 1312 can be made 180 degrees. While achieving a 180-degree signal phase difference between the fourth pad outlet 1314 and the second pad outlet 1312, one or more bends can save the area space of the single-layer feed dielectric board 110. In other scenarios, one bend can be provided on the second microstrip line 1322, two bends can be provided, or multiple bends can be provided, and one bend can be provided on the third microstrip line 1323, two bends can be provided, or multiple bends can be provided. The area space of the single-layer feed dielectric board 110 can be saved, which is beneficial to miniaturization. In the embodiments of the present disclosure, by providing one or more bent segments on the second microstrip line 1322 or one or more bends on the third microstrip line 1323, the length of the second microstrip line 1322 or the third microstrip line 1323 can be increased, the signal phase difference between the first pad outlet 1311 and the third pad outlet 1313 can be made 180 degrees or the signal phase difference between the fourth pad outlet 1314 and the second pad outlet 1312 can be made 180 degrees, and the area space of the single-layer feed dielectric board 110 can be saved, which is beneficial to miniaturization.Moreover, by providing one or more bent segments on the second microstrip line 1322 and one or more bends on the third microstrip line 1323, the lengths of the second microstrip line 1322 and the third microstrip line 1323 can be increased, such that the signal phase difference between the first pad outlet 1311 and the third pad outlet 1313 is 180 degrees and the signal phase difference between the fourth pad outlet 1314 and the second pad outlet 1312 is 180 degrees, which can save more area space of the single-layer feeding dielectric plate 110 and is beneficial to miniaturization.

[0066] In some embodiments, such as Figure 7As shown, the 3dB bridge circuit 140 may include four feeder lines 142, where: The first feeder line 1421 may have one end connected to the first port 1411 and the other end connected to the second port 1412; The second feeder line 1422 may have one end connected to the second port 1412 and the other end connected to the third port 1413; The third feeder line 1423 may have one end connected to the third port 1413 and the other end connected to the fourth port 1414, and the third feeder line 1423 may jump over above the second microstrip line 1322 to avoid the second microstrip line 1322; The fourth feeder line 1424 may have one end connected to the first feeder line 1421 and the other end connected to the third feeder line 1423. Both ends of the first feeder line 1421 may be respectively connected to the first port 1411 and the second port 1412. Both ends of the second feeder line 1422 may be respectively connected to the second port 1412 and the third port 1413. Both ends of the third feeder line 1423 may be respectively connected to the third port 1413 and the fourth port 1414. Both ends of the fourth feeder line 1424 may be respectively connected to the first feeder line 1421 and the third feeder line 1423. In some scenarios, a jumper setting may be performed near the intersection of the third feeder line 1423 and the second microstrip line 1322, and the third feeder line 1423 may be arranged above the second microstrip line 1322 to avoid the physical path of the second microstrip line 1322. The first feeder line 1421, the second feeder line 1422, the third feeder line 1423, and the fourth feeder line 1424 may also be bent, and one or more bent segments may be provided. After bending, re-optimization may be performed for impedance matching. In the embodiments of the present disclosure, the third feeder line 1423 may be arranged above the second microstrip line 1322 to avoid the physical path of the second microstrip line 1322, so as to achieve reasonable wiring within the limited area of the single-layer feeding dielectric plate 110, avoid line interference, effectively reduce the area of the single-layer feeding dielectric plate 110, and achieve miniaturization. The signal of the transmitter can be effectively transmitted to the first port 1411 and the fourth port 1414, and transmitted to the second port 1412 and the third port 1413 through the feeder lines, and the signal is transmitted to the four-feed-point power division network circuit 130 through the second port 1412 and the third port 1413. The signal can be fed to the dipole radiation unit 150 through the four-feed-point power division network circuit 130, so that the dipole radiation unit 150 forms a dual circularly polarized wave.

[0067] In some embodiments, as Figure 1 , Figure 2 , Figure 4 , Figure 9 shown, the dual circularly polarized antenna unit 100 may further include: a cavity 160, which may be generally cylindrical, and the cavity 160 may include: a bottom plate 161 and a side wall 162.

[0068] The bottom plate 161, as Figure 1, Figure 2 , Figure 4 , Figure 9 As shown in Figure 9 , it can be arranged below the single-layer feeding dielectric plate 110. The bottom plate 161 can be made of metal, such as aluminum, copper, etc. The bottom plate 161 can be set with sufficient thickness and arranged below the single-layer feeding dielectric plate 110 to serve as the support plate of the entire dual circular polarization antenna unit 100.

[0069] The side wall 162, such as Figure 1 , Figure 2 , Figure 4 , Figure 9 As shown in Figure 9 , the bottom end can be connected to the peripheral side of the bottom plate 161 and extend upward, and can be arranged outside the single-layer feeding dielectric plate 110 and the dipole radiation unit 150. The bottom end of the side wall 162 can be connected to the peripheral side of the bottom plate 161, and can be separately arranged or integrally formed. The side wall 162 can extend upward along the peripheral side of the bottom plate 161 and be arranged outside the single-layer feeding dielectric plate 110 and the dipole radiation unit 150 for protecting the single-layer feeding dielectric plate 110 and the dipole radiation unit 150. When the bottom end of the side wall 162 is separately arranged from the bottom plate 161, the height of the side wall 162 can be increased to increase the beam width of the antenna.

[0070] In the embodiment of the present disclosure, by setting the cavity 160, the bottom plate 161 can be arranged below the single-layer feeding dielectric plate 110 and can be used as the supporting metal floor of the antenna, and the side wall 162 can be arranged outside the single-layer feeding dielectric plate 110 and the dipole radiation unit 150 to protect the entire antenna unit. The beam width of the antenna can be made wider by increasing the height of the side wall 162.

[0071] In some embodiments, such as Figure 7 As shown in Figure 7 , the single-layer feeding dielectric plate 110 can include a plurality of first through holes 111, and the first through holes 111 can be arranged to avoid the four-feed-point power division network circuit 130 and the 3dB bridge circuit 140. A plurality of first through holes 111 can be provided on the single-layer feeding dielectric plate 110, and there can be four of them.

[0072] Such as Figure 6 As shown in Figure 6 , the radiation panel 151 can be provided with a plurality of second through holes 1513 corresponding to the plurality of first through holes 111. A plurality of second through holes 1513 can be provided on the radiation panel 151, and there can be four of them. The four second through holes 1513 can be correspondingly arranged with the four first through holes 111.

[0073] Such as Figure 4 , Figure 5 , Figure 8 As shown in Figure 8 , the dual circular polarization antenna unit 100 may further include: an antenna cover 170 and a plurality of support columns 180

[0074] The radome 170, as Figure 4 shown, can be disposed above the radiation panel 151. The material of the radome 170 can be epoxy glass cloth. The radome 170 can cover the entire dual circular polarization antenna element 100, be disposed on the uppermost layer of the dual circular polarization antenna element 100, be disposed above the radiation panel 151, and can protect the single-layer feed dielectric plate 110, the two feed ports 120, the four-feed-point power division network circuit 130, the 3dB hybrid circuit 140, and the dipole radiation element 150.

[0075] A plurality of support columns 180, as Figure 8 shown, the bottom end of each support column 180 can be connected to the bottom plate 161, can sequentially pass through the first through hole 111 and the second through hole 1513 respectively, and the top end can be connected to the radome 170. There can be four support columns 180, the bottom ends of the four support columns 180 can be connected to the bottom plate 161, and the top ends can be connected to the radome 170. The four support columns 180 can sequentially pass through the first through hole 111 and the second through hole 1513 respectively, fix the radome 170, the single-layer feed dielectric plate 110, and the dipole radiation element 150 together, and can enhance the structural strength of the entire dual circular polarization antenna element 100.

[0076] In the embodiments of the present disclosure, by providing the radome 170 and the plurality of support columns 180. The radome 170 can protect the single-layer feed dielectric plate 110, the two feed ports 120, the four-feed-point power division network circuit 130, the 3dB hybrid circuit 140, and the dipole radiation element 150 of the dual circular polarization antenna element 100. The first through hole 111 can be provided to avoid the four-feed-point power division network circuit 130 and the 3dB hybrid circuit 140, and can ensure the circuit functions of the four-feed-point power division network circuit 130 and the 3dB hybrid circuit 140 within a limited area, and ensure the reliability of the support. The plurality of support columns 180 can sequentially pass through the first through hole 111 and the second through hole 1513 respectively, fix the radome 170, the single-layer feed dielectric plate 110, and the dipole radiation element 150 together, and can enhance the structural strength of the entire dual circular polarization antenna element 100.

[0077] In some embodiments, the radome 170 is located at the top or middle of the side wall 162. The radome 170 can be disposed at the top of the side wall 162, or can be disposed at the middle of the side wall 162. When the radome 170 is disposed at the top of the side wall 162, the side wall 162 is located on the periphery of the single-layer feed dielectric plate 110 and the dipole radiation element 150, and can be used to protect the single-layer feed dielectric plate 110 and the dipole radiation element 150. When the radome 170 is disposed at the middle of the side wall 162, the side wall 162 is in an increased state at this time, and the beam width can be increased.

[0078] In the embodiments of the present disclosure, by disposing the radome 170 at the top or middle of the sidewall 162, it can be used to protect the single-layer feed dielectric plate 110 and the dipole radiation unit 150, and increasing the sidewall 162 of the cavity 160 can make the beam width of the antenna wider.

[0079] Based on the same inventive concept, an exemplary embodiment of the present disclosure further provides a spaceborne phased array antenna, which may include: a plurality of dual circular polarization antenna units 100, and the plurality of dual circular polarization antenna units 100 are arrayed to radiate together. The dual circular polarization antenna unit 100 may include: a single-layer feed dielectric plate 110, two feed ports 120, a four-feed-point power division network circuit 130, a 3dB hybrid circuit 140, and a dipole radiation unit 150. The two feed ports 120 may be disposed on the single-layer feed dielectric plate 110. The four-feed-point power division network circuit 130 may be disposed on the upper side of the single-layer feed dielectric plate 110, and may include four pad outlets 131 and four microstrip lines 132 respectively communicating with each pad outlet 131. The four microstrip lines 132 may be designed with jumpers, which can avoid mutual interference between lines, save space on the single-layer feed dielectric plate 110, and is beneficial to miniaturization. The 3dB hybrid circuit 140 may be disposed on the lower side of the single-layer feed dielectric plate 110, and may include four ports 141. Among them, the first port 1411 and the fourth port 1414 may be respectively communicated with the feed ports 120, and the second port 1412 and the third port 1413 may be respectively connected to the microstrip lines of the four-feed-point power division network circuit 130, so as to be electrically conductive with the four pad outlets 131. The dipole radiation unit 150 may be disposed above the single-layer feed dielectric plate 110, and may be used to generate dual circular polarization waves through feeding. The radiation arms 152 may be disposed at the edges of the radiation panel 151, and the radiation arms 152 may be bent.

[0080] In the embodiments of the present disclosure, the antenna adopts a three-dimensional folded and thin metal dipole radiation unit, which not only solves the disadvantages of narrow bandwidth and low gain of microstrip patches, but also solves the problem of high profile of conventional dipole antennas. The height of the dipole antenna of the present invention is only 0.125 wavelengths of the center frequency, and the microstrip lines and feed lines of the four-feed-point power division network circuit 130 and the 3dB hybrid circuit 140 are designed with serpentine traces and disposed on the single-layer feed dielectric plate 110, which solves the problem of complex design of the multi-layer board feed network, conducts miniaturization processing, greatly reduces the design and manufacturing difficulty, and at the same time reduces the dielectric loss, achieving the effects of high gain and low axial ratio. At the same time, a relatively wide gain bandwidth (Gain≥5dBi bandwidth is 19%), impedance bandwidth (S11≤-10dB impedance bandwidth is 27%), and axial ratio bandwidth (AR≤3dB bandwidth is 18%) are realized, and all performance indicators are good, meeting the requirements of spaceborne phased array antenna units.

[0081] This application uses specific terms to describe the embodiments of this application. For example, "an embodiment", "one embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0082] In the context of this application, unless the context clearly indicates an exception, words such as "a", "an", "one", and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0083] Similarly, it should be noted that, in order to simplify the description of this application disclosure and thus help the understanding of one or more application embodiments, in the previous description of the embodiments of this application, sometimes multiple features are grouped into one embodiment, drawing, or description thereof. However, this disclosure method does not mean that the features required by the subject matter of this application are more than those mentioned in the claims. In fact, the features of the embodiment are fewer than all the features of the single embodiment disclosed above.

[0084] The basic concepts have been described above. Obviously, for those skilled in the art, the above disclosure is only an example and does not constitute a limitation to this application. Although not explicitly stated here, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are proposed in this application, so such modifications, improvements, and corrections still fall within the spirit and scope of the embodiments of this application.

Claims

1. A dual circular polarization antenna unit, comprising: Single-layer feed dielectric board; Two feeding ports, arranged on the single-layer feeding dielectric board; A four-feed point power division network circuit is arranged on the side surface of the single-layer feeding dielectric board, and includes four pad outlets and four microstrip lines respectively connected to each of the pad outlets; A 3dB bridge circuit is arranged on the lower side of the single-layer feeding dielectric plate, and includes four ports, wherein the first port and the fourth port are respectively connected to the feeding port, and the second port and the third port are respectively connected to the microstrip line of the four-feed point power division network circuit, so as to be electrically conductive with the four pad outlets; A dipole radiation unit is arranged above the single-layer feeding dielectric plate and is used to generate dual circular polarized waves through feeding. The dipole radiation unit includes: The radiation panel is in the shape of a plate as a whole; a radiation arm, disposed at an edge of the radiation panel, and the radiation arm is bent; and Four feeding pins, each of which has an upper end connected to the radiation panel and a lower end connected to the corresponding pad outlet.

2. The dual circular polarization antenna unit according to claim 1, wherein: The radiation arm is in the shape of a bent plate as a whole and is arranged below the radiation panel through at least one bend.

3. The dual circular polarization antenna unit according to claim 2, wherein: The radiating arm comprises: A first vertical plate, the upper end of which is connected to the side of the radiation panel and extends downward as a whole; A first horizontal plate, the outer end of which is connected to the lower end of the first vertical plate and extends toward the inner side of the radiation panel, and the inner end opposite to the outer end of the first horizontal plate is located below the radiation panel; A second vertical plate, the upper end of which is connected to the inner end of the first horizontal plate and extends downward as a whole; The second horizontal plate has an inner end connected to the lower end of the second vertical plate and extends outward from the radiation panel, and an outer end opposite to the inner end of the second horizontal plate does not exceed the vertical projection area of ​​the radiation panel.

4. The dual circular polarization antenna unit according to any one of claims 1 to 3, wherein: The radiation panel is rectangular in shape as a whole; The dipole radiation unit includes four radiation arms, which are respectively arranged on the rectangular sides of the radiation panel.

5. The dual circular polarization antenna unit according to claim 4, wherein: The radiation panel is provided with four rectangular through holes, and the four rectangular through holes are respectively arranged on the inner sides of the side edges of the radiation panel.

6. The dual circular polarization antenna unit according to claim 5, wherein: The length of the rectangular through hole is 9.8 mm-10 mm, and the width of the rectangular through hole is 5.8 mm-6.2 mm.

7. The dual circular polarization antenna unit according to claim 5, wherein: The radiation panel is provided with four rectangular grooves, which are spaced apart from the four rectangular through holes, and one end of the four rectangular grooves is arranged close to the upper ends of the four feeding pins.

8. The dual circular polarization antenna unit according to claim 1, wherein: The four-feed point power division network circuit comprises: A first microstrip line, one end of which is connected to the first pad outlet, and the other end of which is connected to the second port of the 3dB bridge circuit; A third microstrip line, one end of which is connected to the third pad outlet, and the other end of which is connected to the first microstrip line, and the length from the first pad outlet to the connection between the first microstrip line and the third microstrip line is less than the length of the third microstrip line; a fourth microstrip line, one end of which is connected to the fourth pad outlet, and the other end of which is connected to the third port of the 3dB bridge circuit; The second microstrip line has one end connected to the second pad outlet and the other end connected to the fourth microstrip line, and the length from the fourth pad outlet to the connection between the second microstrip line and the fourth microstrip line is shorter than the length of the second microstrip line.

9. The dual circular polarization antenna unit according to claim 8, wherein: The second microstrip line includes one or more bending sections, so that the signal phase difference between the first pad outlet and the third pad outlet is 180 degrees; and / or the third microstrip line includes one or more bending sections, so that the signal phase difference between the fourth pad outlet and the second pad outlet is 180 degrees.

10. The dual circular polarization antenna unit according to claim 8 or 9, wherein: The 3dB bridge circuit includes four feed lines, wherein: A first feeder, one end of which is connected to the first port, and the other end of which is connected to the second port; a second feeder, one end of which is connected to the second port, and the other end of which is connected to the third port; a third feeder, one end of which is connected to the third port, and the other end of which is connected to the fourth port, and the third feeder is jumpered above the second microstrip line to avoid the second microstrip line; A fourth feeder has one end connected to the first feeder, and the other end connected to the third feeder.

11. The dual circular polarization antenna unit according to claim 1, wherein: The dual circular polarization antenna unit further includes: a cavity, which is cylindrical in shape as a whole, and the cavity includes: A bottom plate, arranged below the single-layer feeding dielectric plate; The side wall has a bottom end connected to the peripheral side of the bottom plate and extends upward, and is arranged on the outer side of the single-layer feeding dielectric plate and the dipole radiation unit.

12. The dual circular polarization antenna unit according to claim 11, wherein: The single-layer feeding dielectric plate includes a plurality of first through holes, and the first through holes are arranged to avoid the four-feed point power division network circuit and the 3dB bridge circuit; The radiation panel is provided with a plurality of second through holes corresponding to the plurality of first through holes; The dual circular polarization antenna unit also includes: A radome, disposed above the radiation panel; as well as, A plurality of support columns, each of which has a bottom end connected to the bottom plate, passes through the first through hole and the second through hole in sequence, and a top end connected to the antenna cover.

13. The dual circular polarization antenna unit according to claim 12, wherein: The radome is located at the top or the middle of the side wall.

14. A spaceborne phased array antenna, comprising: According to any one of claims 1 to 13, the plurality of dual circularly polarized antenna units are arranged in an array for common radiation.

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