Dual circularly polarized antenna unit and spaceborne phased array antenna

Abstract

The present disclosure relates to the technical field of antennas, in particular to a dual circularly polarized antenna unit and a satellite-borne phased array antenna, wherein the dual circularly polarized antenna unit comprises: a single-layer feed dielectric plate; two feed ports; a four-feed-point power division network circuit; a 3dB bridge circuit; and a dipole radiating unit, which comprises: a radiation panel in the form of a whole plate; a radiation arm arranged at the edge of the radiation panel and bent; and four feed pins, each of which is connected to the radiation panel at the upper end and connected to the corresponding pad outlet at the lower end. The present disclosure sets a single-layer feed dielectric plate, and the first microstrip line and the feed line of the four-point feed power division network circuit and the 3dB bridge circuit are designed in a serpentine manner, which is miniaturized, and the radiation arm of the dipole radiating unit is also miniaturized in a three-dimensional folding manner, thereby reducing the height and radiation aperture of the dipole antenna, and the antenna height is only 0.125 wavelengths of the center frequency point.

Description

Technical Field

[0001] This disclosure relates to the field of antenna technology, specifically to a dual circularly polarized antenna element and a spaceborne phased array antenna. Background Technology

[0002] 6G will enable space-based coverage in remote land areas, at sea, and in the air, ultimately building a space-ground integrated mobile communication network. In this context, higher demands are placed on dual-circularly polarized spaceborne phased array antennas capable of achieving shared transmit and receive apertures. However, in the satellite domain, where antenna structural strength, radiation resistance, and high / low temperature tolerance are crucial, issues such as low antenna gain, narrow bandwidth, high manufacturing difficulty, complex power supply network design, and challenges in miniaturization exist. Summary of the Invention

[0003] To overcome the problems existing in related technologies, an exemplary embodiment of this disclosure provides a dual circularly polarized antenna unit, comprising: a single-layer feed dielectric substrate; two feed ports disposed on the single-layer feed dielectric substrate; a four-feed-point power divider network circuit disposed on the upper side of the single-layer feed dielectric substrate, including four pad exits and four microstrip lines respectively connected to each of the pad exits; and a 3dB bridge circuit disposed on the upper side of the single-layer feed dielectric substrate, including four ports, wherein the first port and the fourth port are respectively connected to the feed ports. The second and third ports are connected to the microstrip lines of the four-feed-point power divider network circuit, respectively, so that they are electrically connected to the four pad outlets; a dipole radiating unit is disposed above the single-layer feed dielectric board and is used to generate a double circularly polarized wave through feeding. The dipole radiating unit includes: a radiating panel, which is plate-shaped in general; a radiating arm disposed at the edge of the radiating panel and the radiating arm is bent; and four feed pins, the upper end of each feed pin is connected to the radiating panel and the lower end is connected to the corresponding pad outlet.

[0004] In some embodiments, the radiating arm is generally in the shape of a bent plate and is disposed below the radiating panel by at least one bend.

[0005] In some embodiments, the radiating arm includes: a first vertical plate, the upper end of which is connected to the side of the radiating panel and extends downwards 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 inwards towards the radiating panel, with the inner end opposite to the outer end of the first horizontal plate located below the radiating panel; a second vertical plate, the upper end of which is connected to the inner end of the first horizontal plate and extends downwards as a whole; and a second horizontal plate, the inner end of which is connected to the lower end of the second vertical plate and extends outwards towards the radiating panel, with the outer end opposite to the inner end of the second horizontal plate not exceeding the vertical projection area of ​​the radiating panel.

[0006] In some embodiments, the radiating panel is rectangular in shape; the dipole radiating unit includes four radiating arms, which are respectively disposed on the rectangular side of the radiating panel.

[0007] In some embodiments, the radiating panel is provided with four rectangular through holes, which are respectively disposed on the inner side of the side of the radiating panel.

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

[0009] In some embodiments, the radiating 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 positioned close to the upper end of the four feed pins.

[0010] In some embodiments, the four-feed-point power divider network circuit includes: a first microstrip line, one end of which is connected to a 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 a third pad outlet and the other end of which is connected to the first microstrip line, wherein 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 a fourth pad outlet and the other end of which is connected to the third port of the 3dB bridge circuit; and a second microstrip line, one end of which is connected to a second pad outlet and the other end of which is connected to the fourth microstrip line, wherein 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 bends such that the signal phase difference between the first pad exit and the third pad exit is 180 degrees; and / or, the third microstrip line includes one or more bends such that the signal phase difference between the fourth pad exit and the second pad exit is 180 degrees.

[0012] In some embodiments, the 3dB bridge circuit includes four feed lines: 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 is jumpered above the second microstrip line to avoid the second microstrip line; and 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 circularly polarized antenna unit further includes: a cavity, which is cylindrical in shape, the cavity including: a base plate disposed below the single-layer feed dielectric plate; and a side wall, the bottom end of which is connected to the periphery of the base plate and extends upward, disposed outside the single-layer feed dielectric plate and the dipole radiating unit.

[0014] In some embodiments, the single-layer feed dielectric board includes a plurality of first through holes, which are disposed away from the four-feed power divider network circuit and the 3dB bridge circuit; the radiating panel is provided with a plurality of second through holes corresponding to the plurality of first through holes; the dual circularly polarized antenna unit further includes: an antenna radome disposed above the radiating panel; and a plurality of support columns, the bottom end of each support column being connected to the base plate, passing through the first through holes and the second through holes in sequence, and the top end being connected to the antenna radome.

[0015] In some embodiments, the radome is located at the top or middle of the sidewall.

[0016] Secondly, this disclosure also provides a spaceborne phased array antenna, including a plurality of dual-circularly polarized antenna elements as described in the first aspect, wherein the plurality of dual-circularly polarized antenna elements are arrayed together for common radiation.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

[0018] This disclosure provides a dual-circularly polarized antenna element and a spaceborne phased array antenna. The dual-circularly polarized antenna element integrates a four-point feed power divider network circuit and a 3dB bridge circuit on a single-layer feed dielectric substrate. Furthermore, the routing design of the four-point feed power divider network circuit and the 3dB bridge circuit is more rational, achieving miniaturization and significantly reducing design and manufacturing difficulty. Simultaneously, it reduces dielectric loss, achieving high gain and low axial ratio. Meanwhile, the radiating arms of the dipole radiating element are also bent, reducing the height and radiating aperture of the dipole antenna. The antenna height can be achieved at 0.125 wavelengths of the center frequency. Attached Figure Description

[0019] This disclosure can be better understood by describing exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, in which:

[0020] Figure 1 This is a schematic diagram of a dual-circularly polarized antenna element according to a disclosed exemplary embodiment;

[0021] Figure 2 This is a schematic diagram of a dual-circularly polarized antenna element according to another disclosed exemplary embodiment;

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

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

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

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

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

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

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

[0029] Figure 10 This is a standing wave ratio-frequency diagram illustrated according to another disclosed exemplary embodiment;

[0030] Figure 11 This is a axial ratio pattern shown according to another disclosed exemplary embodiment;

[0031] Figure 12 This is a gain-frequency diagram illustrated according to another disclosed exemplary embodiment;

[0032] Figure 13 This is a gain pattern shown according to another disclosed exemplary embodiment. Detailed Implementation

[0033] The following describes specific embodiments of this disclosure. It should be noted that, in order to maintain brevity, this specification cannot provide a detailed description of all features of the actual embodiments. It should be understood that, in the actual implementation of any embodiment, just as in any engineering or design project, various specific decisions are often made to achieve the developer's specific goals and to meet system-related or business-related constraints, and this can change from one embodiment to another. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content of this disclosure, some design, manufacturing, or production modifications based on the technical content disclosed herein are merely conventional technical means and should not be construed as insufficient content of this disclosure.

[0034] Unless otherwise defined, the technical or scientific terms used in the claims and description shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in the patent application description and claims of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the element or object preceding "comprising" or "including" encompasses the element or object listed following "comprising" or "including" and its equivalents, and do not exclude other elements or objects. The terms "connected" or "linked" and similar terms are not limited to physical or mechanical connections, nor are they limited to direct or indirect connections.

[0035] The relevant technologies for achieving dual circular polarization both domestically and internationally can be broadly categorized into two types: the first is to introduce a 90° phase difference in the dual-polarized antenna using a 3dB bridge. The second is to achieve dual circular polarization by introducing current perturbations through structural changes in two independent radiating elements. Furthermore, regarding the form of the radiating elements, current main types include microstrip patch antennas and orthogonal dipole antennas. However, both of these technologies for achieving dual circular polarization and the forms of the radiating elements still present many problems that need to be solved. First, regarding the first type of antenna technology combining a 3dB bridge with multi-point feeding, the current main approach is to design the radiating elements and feeding network using multilayer dielectric substrates. This method is complex to design and manufacture, has high dielectric loss, and is not conducive to large-scale manufacturing. Second, regarding the second type of technology that achieves dual circular polarization through perturbations, the circular polarization formed in this way has poor axial ratio performance and narrow axial ratio bandwidth, making it difficult to construct low axial ratio broadband phased array antennas. Third, regardless of which technical route is adopted, there is still room for improvement in the design of radiating elements both domestically and internationally. Existing microstrip patch antennas have low gain and narrow bandwidth, and existing orthogonal dipole antennas are large in size, have high profiles, and are heavy. Fourth, current domestic and international patent literature lacks practicality in engineering applications. The structural designs of many solutions cannot meet engineering applications, especially in the satellite field where the requirements for antenna structural strength, radiation resistance, and high and low temperature resistance are high.

[0036] In some related technologies, the antenna uses four dielectric substrates, stacked from top to bottom as a leading patch layer, a radiating patch layer, a quad-feed power divider network layer, and a 3dB bridge layer. While this design achieves good dual circular polarization performance, it undoubtedly results in low antenna gain, narrow bandwidth, complex multi-layer substrate design, and high fabrication difficulty. Other related technologies employ orthogonal dipoles combined with a 3dB bridge to achieve dual circular polarization. However, the height of the dipole is typically 0.25 wavelengths from the center frequency, and this antenna is no exception, with a height of 18mm, approximately 0.23 wavelengths from the center frequency of 3.8GHz. This results in a relatively high antenna profile, making miniaturization difficult.

[0037] To overcome the problems existing in related technologies, the exemplary embodiments of this disclosure avoid the use of microstrip patches and provide a dual circularly polarized antenna element 100, such as... Figure 1 As shown, it includes: a single-layer feed dielectric board 110, two feed ports 120, a four-feed-point power divider network circuit 130, a 3dB bridge circuit 140, and a dipole radiating unit 150.

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

[0039] Two power supply ports 120, such as Figure 1 , Figure 7 As shown, it can be set on a single-layer feed dielectric board 110. Two feed ports 120 can be provided on the single-layer feed dielectric board 110. The two feed ports 120 can introduce radio frequency signals from the transmitter to the dipole radiating unit 150, or receive signals from the dipole radiating unit 150 to the receiver. The positions of the two feed ports 120 can be determined according to the circuit settings of the 3dB bridge circuit 140, thereby adjusting the phase difference of the signal to achieve circular polarization.

[0040] Four-feed power divider network circuit 130, such as Figure 1 , Figure 7 As shown, the power divider network 130, which can be mounted on the upper side of a single-layer feed dielectric board 110, may include four pad outlets and four microstrip lines connected to each pad outlet. The four-feed-point power divider network 130 is a four-way power divider that can distribute the input signal equally or proportionally to the four pad outlets. The four pad outlets can be evenly and symmetrically arranged, perhaps at the four vertices of a square, integrated on the upper side of the single-layer feed dielectric board 110. This facilitates circuit connection and signal transmission, and the single-layer feed dielectric board 110 is relatively simple and easy to process and manufacture. The four pad outlets are interfaces for connecting the circuit to external devices or other circuits; signals can be input to or output to the power divider network circuit through the four pad outlets. The four microstrip lines are connected to each pad outlet respectively. As microwave transmission lines, microstrip lines have advantages such as small size, light weight, and ease of integration. The four microstrip lines can transmit signals from one location to another, realizing the signal distribution function of the power divider network. The four microstrip lines can be bent, and each microstrip line can be bent separately to ensure that the phase difference between the two pads at the two corresponding diagonal points of the signal is 180 degrees, thus achieving circular polarization. The four microstrip lines can be jumpered to avoid mutual interference between the lines, save space on the single-layer feed dielectric board 110, and facilitate miniaturization.

[0041] 3dB bridge circuit 140, such as Figure 1 , Figure 7As shown, the single-layer power feed dielectric board 110 can be disposed on the upper side and may include four ports. The first port 1411 and the fourth port 1414 can be connected to the power feed port 120, respectively. The second port 1412 and the third port 1413 can be connected to the microstrip lines of the four-feed-point power divider network circuit 130, enabling electrical conduction with the four pad outlets. The four feed lines and four ports of the 3dB bridge circuit 140 can all be integrated on the upper side of the single-layer power feed dielectric board 110. The four feed lines of the 3dB bridge circuit 140 can be bent separately, and each feed line can be bent individually, saving space on the single-layer power feed dielectric board 110. The four ports can be connected to the power feed ports and the microstrip lines of the four-feed-point power divider network circuit 130, respectively. The first port 1411 and the fourth port 1414 can be connected to the feed port 120 respectively, so that the transmitter signal 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 line. Since the second port 1412 and the third port 1413 are respectively connected to the microstrip line of the four-feed point power divider circuit 130, the signal can be transmitted to the four-feed point power divider circuit 130. After passing through the four microstrip lines, the signal can be transmitted to the four pad outlets. At this time, the phase difference between the two pad outlets at the two corresponding diagonal points is 180 degrees, which can feed the dipole radiation unit 150, so that the dipole radiation unit 150 forms a double circularly polarized wave.

[0042] Dipole radiating unit 150, such as Figure 1 , Figure 6 As shown, the dipole radiating unit 150 can be positioned above the single-layer feed dielectric substrate 110 and can be used to generate a dual-circularly polarized wave through feeding. The dipole radiating unit 150 may include: a radiating panel 151, a radiating arm 152, and four feed pins 153. The dipole radiating unit 150 can be positioned above the single-layer feed dielectric substrate 110, and the four feed pins 153 of the dipole radiating unit 150 can be connected to four pad outlets, allowing the signals from the four pad outlets to be fed to the four feed pins 153, thus enabling the dipole radiating unit 150 to generate a dual-circularly polarized wave.

[0043] Radiation panel 151, such as Figure 1 , Figure 6 As shown, the overall structure can be plate-shaped. The radiating panel 151 can be rectangular or circular, and can have a plate-like structure. Multiple cutouts can be provided on the radiating panel 151, and these cutouts can be evenly and symmetrically arranged on the radiating panel 151, and can be rectangular, circular, etc. These cutouts can change the current distribution on the radiating panel 151, increasing capacitance and thus increasing the antenna bandwidth. Multiple through holes can be provided on the radiating panel 151 to accommodate support pillars, increasing the stability of the radiating panel 151.

[0044] Radiation arm 152, such as Figure 1 , Figure 6 As shown, the radiating arms 152 can be positioned at the edge of the radiating panel 151 and can be bent. Multiple radiating arms 152 can be symmetrically arranged at the edge of the radiating panel 151. In some scenarios, the radiating panel 151 can be rectangular, and four radiating arms 152 can be positioned at the four edges of the rectangular radiating panel 151. This can be a plate-like structure, utilizing the field enhancement effect at the edge of the radiating panel 151 to improve radiation efficiency. The radiating arms 152 can be bent, either once or multiple times. Multiple bends increase the equivalent capacitance and reduce the antenna height and radiating aperture. The bending angle can be 60-120 degrees, or even 90 degrees. The width and length of the bend can be determined based on the specific dimensions of the radiating panel 151. Increasing the bend width of the radiating arms 152 increases the capacitance, thereby forming a resonant circuit and expanding the bandwidth. The bending of the radiating arms 152 at the edge of the radiating panel 151 can match the current distribution at the edge of the radiating panel 151, reducing reflection and improving the standing wave ratio.

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

[0046] In this embodiment, a dual circularly polarized antenna element 100 is provided. This element integrates a four-point feed power divider network circuit 130, a 3dB bridge circuit 140, and two feed ports 120 onto a single-layer feed dielectric substrate 110. Furthermore, the microstrip lines and feed lines of the four-point feed power divider network circuit 130 and the 3dB bridge circuit 140 are miniaturized through reasonable routing, greatly reducing design and manufacturing difficulty, while also reducing dielectric loss, achieving high gain and low axial ratio. Simultaneously, the radiating arms 152 of the dipole radiating element 150 are miniaturized through bending, reducing the height and radiating aperture of the dipole antenna; the antenna height is only 0.125 wavelengths of the center frequency.

[0047] In some embodiments, the radiating arm 152 may be integrally bent into a plate shape, such as... Figure 6As shown, the radiating arm 152 can be positioned below the radiating panel 151 via at least one bend. The radiating arm 152 is a bent plate-like structure below the radiating panel 151. The radiating arm 152 can be a single bent plate-like structure, L-shaped, positioned below the radiating panel 151 to achieve miniaturization and save space. Distributed inductance and capacitance can be introduced at the bend to form additional resonant points, expanding bandwidth or supporting multi-band operation (supporting not only low-frequency operation but also high-frequency operation). The radiating arm 152 can also be a plate-like structure with two bends, either U-shaped or Z-shaped, allowing for further miniaturization by extending the surface current path and lowering the resonant frequency. The radiating arm 152 can also be a plate-like structure with three bends, further achieving miniaturization and reducing the antenna height and radiating aperture.

[0048] In this embodiment of the disclosure, by setting the radiating arm 152 as having at least one bent plate-like structure and placing it below the radiating panel 151, the outward extension of the radiating arm can be avoided to increase the radial dimension of the antenna, and the height and radiating aperture of the antenna can be reduced, thereby achieving miniaturization, saving space, and expanding bandwidth. It can support not only low-frequency operation but also high-frequency operation.

[0049] In some embodiments, such as Figure 6 As shown, the radiating arm 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 radiating arm 152 can be welding or integral molding.

[0050] First vertical board 1521, as Figure 6 As shown, the upper end can be connected to the side of the radiating panel 151, and the whole can extend downwards; the outer end of the first horizontal plate 1522 can be connected to the lower end of the first vertical plate 1521, and it can extend inwards towards the radiating panel 151, with its inner end opposite to the outer end of the first horizontal plate 1522 located below the radiating panel 151. The upper end of the first vertical plate 1521 can be connected to the side of the radiating panel 151, and after extending downwards, it can be connected to the outer end of the first horizontal plate 1522. The first horizontal plate 1522 can extend inwards (towards the center of the radiating panel 151), and the first horizontal plate 1522 can be lower than the bottom surface of the radiating panel 151 in the vertical direction.

[0051] The second vertical board 1523, as shown Figure 6As shown, the upper end of the second horizontal plate 1524 can be connected to the inner end of the first horizontal plate 1522, and the entire plate can extend downwards. The inner end of the second horizontal plate 1524 can be connected to the lower end of the second vertical plate 1523, and the plate can extend outwards from the radiating panel 151. The outer end of the second horizontal plate 1524, opposite to the inner end of the second horizontal plate 1524, does not exceed the vertical projection area of ​​the radiating 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 the plate also extends downwards. The inner end of the second horizontal plate 1524 can be connected to the lower end of the second vertical plate 1523, and the plate extends outwards, but does not exceed the horizontal range of the radiating panel 151, thus maintaining a compact structure and enabling effective radiation.

[0052] In this embodiment, by configuring the radiating arm 152 as four plate-like structures with three folds, which is equivalent to bending the radiating arm 152 three times, the area of ​​the radiating arm can be extended within a limited space, and the radiating arm is kept in the space below the radiating panel 151, avoiding the expansion of the antenna's radial dimension. This allows for further miniaturization, saving space, and by extending the surface current path and lowering the resonant frequency, the antenna height and radiating aperture can be further reduced.

[0053] In some embodiments, such as Figure 1 , Figure 6 As shown, the radiating panel 151 can be rectangular in shape; the dipole radiating unit 150 can include four radiating arms 152, which can be respectively disposed on the rectangular sides of the radiating panel 151. The radiating panel 151 can be rectangular, and four radiating arms 152 can be provided, which can be disposed at the four edges of the rectangular radiating panel 151, and can be plate-like structures. In this embodiment of the present disclosure, four radiating arms 152 can be provided on the four sides of the rectangular radiating panel 151. By utilizing the field enhancement effect at the edges of the radiating panel 151, the radiation efficiency can be improved, the design and manufacturing difficulty can be reduced, and the effect of high gain and low axial ratio can be achieved.

[0054] In some embodiments, such as Figure 2 , Figure 3As shown, four rectangular through holes 1512 can be provided on the radiating panel 151, and the four rectangular through holes 1512 can be respectively provided on the inner side of the side of the radiating panel 151. The through holes 1512 on the radiating panel 151 can be rectangular, and there can be four of them. The four rectangular through holes 1512 can be uniformly and symmetrically arranged on the inner side of the side of the radiating panel 151, which allows the surface current of the radiating panel 151 to flow around the edges of the four rectangular through holes 1512, extending the effective current path and effectively 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 this embodiment of the present disclosure, by providing four rectangular through holes on the inner side of the radiating panel 151, the radiation efficiency is improved, the capacitance can be increased, the bandwidth can be expanded, and the impedance matching can be optimized. The four symmetrically arranged rectangular through holes 1512 can optimize the dual circular polarization performance, resulting in higher gain, more uniform radiation, and a wider beam. Moreover, the rectangular through holes are simple to manufacture and save costs.

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

[0056] like Figure 10 As shown in the figure, the curves in the figure are the VSWR curves of endpoint 1 and endpoint 2 as they change with frequency. It can be seen that the VSWR is less than 1.3 throughout the entire frequency band.

[0057] like Figure 11 As shown in the figure, the curve in the figure is the curve of the axial ratio following the frequency change, and it can be seen that the axial ratio is less than 1.7dB.

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

[0059] In this embodiment, the dimensions of the four rectangular through-holes are optimized to improve dual circular polarization performance, resulting in higher gain, more uniform radiation, and a wider beam. This achieves a wider gain bandwidth (19% bandwidth for Gain ≥ 5dBi), impedance bandwidth (27% impedance bandwidth for S11 ≤ -10dB), and axial ratio bandwidth (18% bandwidth for AR ≤ 3dB), with excellent performance indicators that meet the requirements of spaceborne phased array antenna elements.

[0060] In some embodiments, such as Figure 2 , Figure 3 As shown, four rectangular grooves 1511 can be provided on the radiating panel 151, which can be spaced apart from four rectangular through holes 1512. One end of the four rectangular grooves 1511 can be positioned close to the upper end of the four feed pins 153. The four rectangular grooves 1511 can be configured according to the size of the radiating panel 151. By providing four rectangular grooves 1511 on the radiating panel 151 and spacing them apart from the four rectangular through holes 1512, a tortuous current path can be formed on the radiating panel 151, thereby expanding the bandwidth of the antenna and adjusting the resonant frequency. The placement of one end of the groove 1511 close to the four feed pins 153 can enhance the electromagnetic coupling between the four-feed power divider network circuit 130 and the radiating panel 151, thereby improving the feeding efficiency. The four rectangular grooves can reduce the weight of the radiating panel and maintain the rigidity of the structure. In this embodiment, by providing four rectangular grooves 1511 on the radiating panel 151, the current distribution can be adjusted and coupling reduced. At the same time, the placement close to the four feed pins 153 can optimize impedance matching and improve signal transmission efficiency.

[0061] In some embodiments, such as Figure 7 As shown, the four-feed-point power divider 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 is 1321, as shown below. Figure 7 As shown, one end of the first microstrip line 1321 can be connected to the first pad outlet 1311, and the other end can be connected to the second port 1412 of the 3dB bridge circuit. The third microstrip line 1323 has one end connected to the third pad outlet 1313 and the other end connected to the first microstrip line 1321. The length from the first pad outlet 1311 to the connection point between the first microstrip line 1321 and the third microstrip line 1323 can 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 can be respectively located at the two ends of the first microstrip line 1321, and the third pad outlet 1313 and the first microstrip line 1321 can be respectively located at the third microstrip line 1323. The length of the third microstrip line 1323 can be greater than the length from the first pad outlet 1311 to the connection point between the first microstrip line 1321 and the third microstrip line 1323. This distance difference allows the phase difference between the signal reaching the first pad outlet 1311 and the third pad outlet 1313 to be 180 degrees.

[0063] The fourth microstrip line is 1324, such as Figure 7As shown, one end of the second microstrip line 1322 can be connected to the fourth pad outlet 1314, and the other end can be connected to the third port 1413 of the 3dB bridge circuit. The second microstrip line 1322 can be connected to the second pad outlet 1312 at one end and to the fourth microstrip line 1324 at the other end. The length from the fourth pad outlet 1314 to the connection point between 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 outlet 1314 and the third port 1413 of the 3dB bridge circuit can be located at opposite ends of the fourth microstrip line 1324, and the second pad outlet 1312 and the fourth microstrip line 1324 can be located at opposite 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. This distance difference can make the phase difference between the signal reaching the fourth pad exit 1314 and the second pad exit 1312 180 degrees.

[0064] In this embodiment, the length of the third microstrip line 1323 can 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, and the length of the second microstrip line 1322 can be greater than the length from the fourth pad outlet 1314 to the connection point of the second microstrip line 1322 and the fourth microstrip line 1324. This allows the phase difference between the signal reaching the first pad outlet 1311 and the third pad outlet 1313 to be 180 degrees, and the phase difference between the signal reaching the fourth pad outlet 1314 and the second pad outlet 1312 to be 180 degrees. This allows the signal to be fed to the dipole radiation unit 150, causing the dipole radiation unit 150 to form a double circularly polarized wave.

[0065] In some embodiments, such as Figure 7As shown, the second microstrip line 1322 may include one or more bends, such that the signal phase difference between the first pad exit 1311 and the third pad exit 1313 is 180 degrees; or the third microstrip line 1323 may include one or more bends, such that the signal phase difference between the fourth pad exit 1314 and the second pad exit 1312 is 180 degrees. The second microstrip line 1322 may include one or more bends, such that the signal phase difference between the first pad exit 1311 and the third pad exit 1313 is 180 degrees, and the third microstrip line 1323 may include one or more bends, such that the signal phase difference between the fourth pad exit 1314 and the second pad exit 1312 is 180 degrees. In some scenarios, the second microstrip line 1322 may have one bend, two bends, or multiple bends. Two or more bends can be continuous or distributed. Bending can be performed according to the specific location and conditions of the line. Bending can increase the length of the second microstrip line 1322, allowing the signal phase difference between the first pad exit 1311 and the third pad exit 1313 to be 180 degrees. While achieving this 180-degree signal phase difference between the first pad exit 1311 and the third pad exit 1313, one or more bends can save space on the single-layer feed dielectric board 110. Alternatively, one, two, or multiple bends can be provided on the third microstrip line 1323, increasing its length. This allows the signal phase difference between the fourth pad exit 1314 and the second pad exit 1312 to be 180 degrees. While achieving this 180-degree signal phase difference between the fourth pad exit 1314 and the second pad exit 1312, one or more bends can save area space on the single-layer feed dielectric board 110. In other scenarios, the second microstrip line 1322 can have one, two, or multiple bends, and the third microstrip line 1323 can have one, two, or multiple bends. This saves space on the single-layer feed dielectric board 110, which is beneficial for miniaturization. In this embodiment, by providing one or more bends 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. This allows the signal phase difference between the first pad outlet 1311 and the third pad outlet 1313 to be 180 degrees, or the signal phase difference between the fourth pad outlet 1314 and the second pad outlet 1312 to be 180 degrees, thus saving space on the single-layer feed dielectric board 110 and facilitating miniaturization.Furthermore, by providing one or more bends 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. This allows the signal phase difference between the first pad outlet 1311 and the third pad outlet 1313 to be 180 degrees, and the signal phase difference between the fourth pad outlet 1314 and the second pad outlet 1312 to be 180 degrees. This can further save the area space of the single-layer feed dielectric board 110, which is beneficial for miniaturization.

[0066] In some embodiments, such as Figure 7As shown, the 3dB bridge circuit 140 may include four feed lines: a first feed line 1421, one end of which can be connected to a first port 1411 and the other end to a second port 1412; a second feed line 1422, one end of which can be connected to a second port 1412 and the other end to a third port 1413; a third feed line 1423, one end of which can be connected to a third port 1413 and the other end to a fourth port 1414, and a jumper can be made on the third feed line 1423 above the second microstrip line 1322 to avoid the second microstrip line 1322; and a fourth feed line 1424, one end of which can be connected to the first feed line 1421 and the other end to the third feed line 1423. The two ends of the first feed line 1421 can be connected to the first port 1411 and the second port 1412, respectively. The two ends of the second feed line 1422 can be connected to the second port 1412 and the third port 1413, respectively. The two ends of the third feeder 1423 can be connected to the third port 1413 and the fourth port 1414, respectively. The two ends of the fourth feeder 1424 can be connected to the first feeder 1421 and the third feeder 1423, respectively. In some scenarios, a jumper can be installed near the intersection of the third feeder 1423 and the second microstrip line 1322. The third feeder 1423 can be positioned above the second microstrip line 1322 to avoid the physical path of the second microstrip line 1322. The first feeder 1421, the second feeder 1422, the third feeder 1423, and the fourth feeder 1424 can also be bent, with one or more bends. After bending, re-optimization and impedance matching can be performed. In this embodiment, the third feed line 1423 can be positioned above the second microstrip line 1322 to avoid the physical path of the second microstrip line 1322. This allows for reasonable wiring within the limited area of ​​the single-layer feed dielectric board 110, avoiding line interference and effectively reducing the area of ​​the single-layer feed dielectric board 110, thus achieving miniaturization. This enables the transmitter signal to be effectively transmitted to the first port 1411 and the fourth port 1414, and then transmitted via the feed line to the second port 1412 and the third port 1413. The signal is then transmitted through the second port 1412 and the third port 1413 to the four-feed-point power divider network circuit 130. The signal can then be fed to the dipole radiating unit 150 via the four-feed-point power divider network circuit 130, causing the dipole radiating unit 150 to form a double-circularly polarized wave.

[0067] In some embodiments, such as Figure 1 , Figure 2 , Figure 4 , Figure 9 As shown, the dual circularly polarized antenna element 100 may further include a cavity 160, which may be cylindrical in shape. The cavity 160 may include a base plate 161 and a side wall 162.

[0068] Base plate 161, such as Figure 1 , Figure 2 , Figure 4 , Figure 9 As shown, it can be positioned below the single-layer feed dielectric substrate 110. The base plate 161 can be made of metal, such as aluminum or copper. The base plate 161 can be of sufficient thickness and positioned below the single-layer feed dielectric substrate 110 to serve as a support plate for the entire dual-circular polarized antenna element 100.

[0069] Side wall 162, such as Figure 1 , Figure 2 , Figure 4 , Figure 9 As shown, the bottom end can be connected to the periphery of the base plate 161 and extend upwards, and can be disposed on the outside of the single-layer feed dielectric plate 110 and the dipole radiating element 150. The bottom end of the sidewall 162 can be connected to the periphery of the base plate 161, or can be disposed separately or integrally formed. The sidewall 162 can extend upwards along the periphery of the base plate 161 and is disposed on the outside of the single-layer feed dielectric plate 110 and the dipole radiating element 150. It is used to protect the single-layer feed dielectric plate 110 and the dipole radiating element 150. When the bottom end of the sidewall 162 is disposed separately from the base plate 161, the height of the sidewall 162 can be increased to increase the beamwidth of the antenna.

[0070] In this embodiment of the disclosure, by setting the cavity 160, the base plate 161 can be set below the single-layer feed dielectric plate 110, which can serve as the supporting metal ground of the antenna. The side wall 162 is set outside the single-layer feed dielectric plate 110 and the dipole radiating element 150, which can protect the entire antenna element. By increasing the height of the side wall 162, the beamwidth of the antenna can be made wider.

[0071] In some embodiments, such as Figure 7 As shown, the single-layer power supply dielectric board 110 may include multiple first through holes 111, which are configured to avoid the four-feed-point power divider network circuit 130 and the 3dB bridge circuit 140. Multiple first through holes 111 may be provided on the single-layer power supply dielectric board 110, up to four.

[0072] like Figure 6 As shown, the radiating panel 151 may be provided with a plurality of second through holes 1513 corresponding to a plurality of first through holes 111. The radiating panel 151 may be provided with a plurality of second through holes 1513, up to four. The four second through holes 1513 may be provided corresponding to the four first through holes 111.

[0073] like Figure 4 , Figure 5 , Figure 8 As shown, the dual circularly polarized antenna element 100 may further include: an antenna radome 170 and multiple support pillars 180.

[0074] Antenna radome 170, such as Figure 4 As shown, it can be positioned above the radiating panel 151. The radome 170 can be made of epoxy fiberglass cloth. The radome 170 can cover the entire dual-circularly polarized antenna element 100, and is positioned on the top layer of the dual-circularly polarized antenna element 100. It can be positioned above the radiating panel 151 and can protect the single-layer feed dielectric board 110, the two feed ports 120, the four-feed power divider network circuit 130, the 3dB bridge circuit 140, and the dipole radiating element 150.

[0075] Multiple support columns 180, such as Figure 8 As shown, the bottom end of each support column 180 can be connected to the base plate 161, and can pass through the first through hole 111 and the second through hole 1513 in sequence, respectively. 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 base plate 161, and the top ends can be connected to the radome 170. The four support columns 180 can pass through the first through hole 111 and the second through hole 1513 in sequence, fixing the radome 170, the single-layer feed dielectric plate 110, and the dipole radiating element 150 together, which can enhance the structural strength of the entire dual-circularly polarized antenna element 100.

[0076] In this embodiment, an radome 170 and multiple support pillars 180 are provided. The radome 170 protects the single-layer feed dielectric plate 110, two feed ports 120, four-feed-point power divider network circuit 130, 3dB bridge circuit 140, and dipole radiating element 150 of the dual-circularly polarized antenna unit 100. The first through hole 111 is designed to avoid the four-feed-point power divider network circuit 130 and 3dB bridge circuit 140, ensuring the circuit function of the four-feed-point power divider network circuit 130 and 3dB bridge circuit 140 within a limited area and ensuring the reliability of the support. The multiple support pillars 180 can pass through the first through hole 111 and the second through hole 1513 respectively, fixing the radome 170, the single-layer feed dielectric plate 110, and the dipole radiating element 150 together, thereby enhancing the structural strength of the entire dual-circularly polarized antenna unit 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 or 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 around the single-layer feed dielectric plate 110 and the dipole radiating element 150, and can be used to protect the single-layer feed dielectric plate 110 and the dipole radiating element 150. When the radome 170 is disposed at the middle of the side wall 162, the side wall 162 is in a raised state, which can increase the beamwidth.

[0078] In this embodiment of the disclosure, by placing the radome 170 on the top or middle of the sidewall 162, it can be used to protect the single-layer feed dielectric plate 110 and the dipole radiating element 150, and increasing the height of the sidewall 162 of the cavity 160 can make the antenna beamwidth wider.

[0079] Based on the same inventive concept, an exemplary embodiment of this disclosure also provides a spaceborne phased array antenna, which may include: multiple dual-circularly polarized antenna elements 100, wherein the multiple dual-circularly polarized antenna elements 100 are arrayed together for common radiation. Each dual-circularly polarized antenna element 100 may include: a single-layer feed dielectric substrate 110, two feed ports 120, a four-feed-point power divider network circuit 130, a 3dB bridge circuit 140, and a dipole radiating element 150. The two feed ports 120 may be disposed on the single-layer feed dielectric substrate 110. The four-feed-point power divider network circuit 130 may be disposed on the upper side of the single-layer feed dielectric substrate 110, and may include four pad exits and four microstrip lines connected to each pad exit. The four microstrip lines can be jumpered, which can avoid mutual interference between lines, save space on the single-layer feed dielectric substrate 110, and facilitate miniaturization. A 3dB bridge circuit 140, which can be disposed on the upper side of a single-layer feed dielectric substrate 110, may include four ports. The first port 1411 and the fourth port 1414 can be connected to the feed port 120, respectively. The second port 1412 and the third port 1413 can be connected to the microstrip lines of the four-feed-point power divider network circuit 130, enabling electrical conduction with the four pad outlets. A dipole radiating unit 150, which can be disposed above the single-layer feed dielectric substrate 110, can be used to generate a double-circularly polarized wave through feeding. A radiating arm 152 can be disposed on the edge of the radiating panel 151, and the radiating arm 152 can be bent.

[0080] In this embodiment, the antenna employs a three-dimensional folded, lightweight metal dipole radiating element. This solves the problems of narrow bandwidth and low gain inherent in microstrip patches, as well as the high profile of conventional dipole antennas. The height of the dipole antenna in this invention is only 0.125 wavelengths of the center frequency. Furthermore, the microstrip lines and feed lines of the four-point feed power divider network circuit 130 and the 3dB bridge circuit 140 are designed with a serpentine routing pattern and placed on a single-layer feed dielectric substrate 110. This solves the problem of complex multi-layer board feed network design, miniaturizes the system, greatly reduces design and manufacturing difficulty, and reduces dielectric loss, achieving high gain and low axial ratio. It also achieves a wide gain bandwidth (19% for Gain ≥ 5dBi), impedance bandwidth (27% for S11 ≤ -10dB), and axial ratio bandwidth (18% for AR ≤ 3dB), with excellent performance indicators that meet the requirements of spaceborne phased array antenna elements.

[0081] This application uses specific terms to describe embodiments of the application. Terms such as "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0082] In the context of this application, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0083] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the present application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0084] The basic concepts have been described above. Obviously, for those skilled in the art, the above disclosure is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the embodiments of this application.

Claims

1. A dual circularly polarized antenna unit, comprising: a single-layer feed dielectric plate; two feed ports arranged on the single-layer feed dielectric plate; a four-feed-point power-dividing network circuit arranged on the upper side of the single-layer feed dielectric plate, comprising four solder pad outlets and four microstrip lines respectively connected to each of the solder pad outlets; a 3dB bridge circuit arranged on the upper side of the single-layer feed dielectric plate, comprising four ports, wherein the first port and the fourth port are respectively connected to the feed ports, and the second port and the third port are respectively connected to the microstrip lines of the four-feed-point power-dividing network circuit, so that the four solder pad outlets are electrically connected; a dipole radiating unit arranged above the single-layer feed dielectric plate and configured to generate dual circularly polarized waves through feeding, the dipole radiating unit comprising: a radiation panel in the form of a plate as a whole; a radiation arm arranged at the edge of the radiation panel and bent, the radiation arm being in the form of a bent plate as a whole and arranged below the radiation panel through at least one bend; and four feeding pins, each of which is connected to the radiation panel at the upper end and connected to a corresponding solder pad outlet at the lower end; the two feed ports are located within the area formed by the four solder pad outlets; the four-feed-point power-dividing network circuit comprises: a first microstrip line connected at one end to a first solder pad outlet and at the other end to the second port of the 3dB bridge circuit; a third microstrip line connected at one end to a third solder pad outlet and at the other end to the first microstrip line, and the length from the first solder pad outlet to the connection of the first microstrip line and the third microstrip line is less than the length of the third microstrip line; a fourth microstrip line connected at one end to a fourth solder pad outlet and at the other end to the third port of the 3dB bridge circuit; and a second microstrip line connected at one end to a second solder pad outlet and at the other end to the fourth microstrip line, and the length from the fourth solder pad outlet to the connection of the second microstrip line and the fourth microstrip line is less than the length of the second microstrip line; the 3dB bridge circuit comprises four feed lines, wherein: a first feed line is connected at one end to the first port and at the other end to the second port; a second feed line is connected at one end to the second port and at the other end to the third port; a third feed line is connected at one end to the third port and at the other end to the fourth port, and the third feed line is jumpered above the second microstrip line to avoid the second microstrip line; and a fourth feed line is connected at one end to the first feed line and at the other end to the third feed line.

2. The dual circular polarized antenna element of claim 1, wherein, the radiation arm comprises: a first vertical plate connected at the upper end to the side of the radiation panel and extending downward as a whole; a first horizontal plate connected at the outer end to the lower end of the first vertical plate and extending 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 connected at the upper end to the inner end of the first horizontal plate and extending downward as a whole; a second horizontal plate connected at the inner end to the lower end of the second vertical plate and extending toward the outer side 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.

3. The dual circularly polarized antenna unit according to claim 1 or 2, wherein, the radiation panel is in a whole rectangular shape; the dipole radiation unit comprises four radiation arms, respectively arranged at the side edges of the radiation panel.

4. The dual circular polarized antenna element of claim 3, wherein, four rectangular through holes are arranged on the radiation panel, and the four rectangular through holes are arranged on the inner side of the side edges of the radiation panel.

5. The dual circular polarized antenna element of claim 4, wherein, the length of the rectangular through hole is 9.8mm-10mm, and the width of the rectangular through hole is 5.8mm-6.2mm.

6. The dual circular polarized antenna element of claim 4, wherein, four rectangular grooves are arranged on the radiation panel, and the four rectangular grooves are arranged at intervals with the four rectangular through holes, and one end of the four rectangular grooves is arranged close to the upper end of the four feeding pins.

7. The dual circular polarized antenna element of claim 1, wherein, the second microstrip line comprises one or more bending segments, so that the signal phase difference between the first solder pad outlet and the third solder pad outlet is 180 degrees; and / or, the third microstrip line comprises one or more bending segments, so that the signal phase difference between the fourth solder pad outlet and the second solder pad outlet is 180 degrees.

8. The dual circular polarized antenna element of claim 1, wherein, The dual circularly polarized antenna unit further comprises: a cavity in a whole cylindrical shape, the cavity comprising: a bottom plate arranged below the single-layer feeding dielectric plate; a side wall connected to the side of the bottom plate at the bottom end and extending upward, arranged outside the single-layer feeding dielectric plate and the dipole radiation unit.

9. The dual circularly polarized antenna unit according to claim 8, wherein, the single-layer feeding dielectric plate comprises a plurality of first through holes, the first through holes being 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 circularly polarized antenna unit further comprises: a radome arranged above the radiation panel; and, a plurality of support columns, the bottom end of each support column being connected to the bottom plate, sequentially passing through the first through hole and the second through hole, and the top end being connected to the radome.

10. The dual circular polarized antenna element of claim 9, wherein, The radome is located at the top or middle of the side wall.

11. A space-borne phased array antenna comprising: A plurality of dual circularly polarized antenna units according to any one of claims 1-10, the plurality of dual circularly polarized antenna units are arranged to radiate together.

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