CN211670317U - Broadband dual-circular-polarization flat satellite antenna - Google Patents

Abstract

The utility model relates to a satellite antenna technical field especially relates to a two circular polarization flat satellite antenna of wide band, divide the electric bridge including the 3dB equipower branch electric bridge of double linear polarization flat satellite antenna and have 90 phase differences, the 3dB equipower branch electric bridge that has 90 phase differences is integrated mutually with the total port of double linear polarization flat satellite antenna, and the 3dB equipower branch electric bridge that has 90 phase differences is used for the conversion of two circular polarization signals and double linear polarization signals. The utility model discloses further increase the work bandwidth and the gain of two circular polarization plate waveguide array satellite antenna, reduced plate satellite antenna's profile height, optimize plate satellite antenna's feed network structure, improve antenna orofacial radiation efficiency.

Description

Broadband dual-circular-polarization flat satellite antenna

Technical Field

The utility model relates to a satellite antenna technical field especially relates to a low profile height, broadband (11.0 ~ 14.9GHz), two circular polarization flat satellite antenna, is applicable to the satellite communication antenna of fixed mounting or removal carrier (as on-vehicle, machine carries, ship-borne etc.) assembly.

Background

Satellite communication has the advantages of multiple access function, wide coverage range, wide transmission frequency band, large communication capacity, good communication stability, high quality and the like. Satellite communication plays a vital role in areas with vast population and imperfect communication facilities such as oceans, deserts, grasslands and the like, and the technical characteristics of the integration of rapidly developing low-orbit satellite groups and cellular communication technology are more and more obvious. Therefore, communication with satellites at any time and any place on fixed or mobile carriers is an urgent need for emergency communication and real-time communication. The satellite mobile communication system of the mobile carrier is often called "communication-in-motion", and one of the core technologies is the satellite antenna technology. The antenna forms of the motion communication include a parabolic reflector antenna, a phased array antenna, a slab waveguide array antenna, a lens antenna and the like. Satellite antennas on mobile carriers require not only good electrical performance of the antenna, but also a small overall system size, low profile height, and light weight. The main defects of the traditional reflecting parabolic antenna are large volume and weight, large wind resistance and low satellite searching speed under the situation of quick motion; the volume and the height of the phased array satellite antenna are ideal, but the gain of electric scanning is relatively high in loss during large-angle scanning, the manufacturing and maintenance costs are high, and the phased array satellite antenna is difficult to bear in the civil market; in contrast, the slab waveguide array antenna has the advantages of low profile height, high antenna aperture efficiency, relatively light weight and high search speed, and is very suitable for being used in a satellite communication system in motion.

The planar waveguide array antenna of the international market is currently mainly occupied by the IDOIT corporation of korea, which issued a waveguide horn array planar antenna in PCT/KR2008/005145 of the patent PCT/KR 2008/001008. The radiation layer of the antenna adopts the horn-shaped waveguide with the characteristic of an inward-contraction inclined plane, in order to ensure the gain and the working bandwidth of the waveguide antenna, the antenna unit adopts an inclined port surface with a gentle gradient to realize the impedance matching of a feed port and a radiation port, the overall profile height of the antenna is thicker due to the design, and the overall radiation pattern of the antenna has poor side lobes due to the large-size horn radiation port. The ideit company has proposed an improvement, namely, in PCT/KR2008/003036, a metal grid is added to the horn waveguide mouth, which increases the complexity and cost of production. Also, the IDOIT corporation in these patents of slab waveguide array antennas has disclosed waveguide feed networks that have narrow electromagnetic channels, are difficult to process and electroplate in practice, and have several design details that limit the operating bandwidth of the slab antenna.

Us patent No.5,872,545 discloses a multilayer panel stacked microwave antenna having a basic structure with three layers, one layer being an array of open radiating elements and two layers being a feed network layer allowing reception of two cross-polarized signals. The feed network layer may be a microstrip line, a parallel waveguide, a transmission line, or a combination thereof. United states Raysat company in patent PCT/BG2004/000011, US 7,307,586B 2 and US 2006/0152414 a1 discloses a flat satellite antenna, which forms a radiation channel by stacking multiple layers of open metal plates, and then uses two layers of microstrip lines separated from each other at an upper and lower interval to perform dual polarization feeding, and directly integrates a primary amplifier and an LNB at the rear of an antenna panel, so that the structure is compact, but the microstrip line feeding has large dielectric loss and low antenna radiation efficiency.

German QEST company in patents PCT/EP2010/002645 and PCT/EP2013/001923 discloses a horn antenna array flat satellite antenna, the working bandwidth is expanded by loading symmetrical ridges on horn antenna units, and a plurality of steps are designed in a horn to realize the impedance matching of the antenna and air. The QEST company further discloses a feeding method by comprehensively using a suspended microstrip line and a waveguide network in the patent PCT/EP2013/001939, which has a complex structure and a large overall thickness.

Sichuan Ruidi Aurea technology ltd discloses a circularly polarized waveguide array antenna in patent CN 209056613U, the scheme includes three basic structures of a multi-mode cavity, an open waveguide and a feed waveguide, the multi-mode cavity is connected with a plurality of metal phase shifting devices to realize circular polarization, the structure is relatively complex, and the antenna aperture efficiency and the working frequency bandwidth are relatively low. The university of electronic technology in patent CN 106356640B discloses a broadband dual circularly polarized slab waveguide array antenna, which comprises a radiation aperture, a resonant cavity, a feed square waveguide, a circular polarizer, a dual polarization feed network, and a standard waveguide transition interface stacked in sequence from top to bottom, wherein the-10 dB central bandwidth is 16%, the antenna efficiency is about 60%, and the potential of the scheme has been dug to be sufficient. However, the space thickness of the development is larger, the horizontal polarization and the vertical polarization both adopt a waveguide feeding mode, but the radiation of the horizontal polarization is obtained by polarization rotation of the vertical polarization wave, the structure is more complex, and the polarization conversion loss exists. Nanjing Antana communication technology Limited company has disclosed a dual-polarized transmitting-receiving public waveguide array antenna in patent CN 107871935A, the antenna includes a plurality of broadband dual-polarized antenna sub-arrays and polarization adjusting devices, the working bandwidth and the aperture efficiency of the antenna sub-arrays and the feed network are improved to a certain extent, but the scheme has not fully excavated the excellent electrical performance, and has not been applied to the design of dual-circularly polarized antennas.

In a word, increasing the gain and the working bandwidth of the satellite antenna and simultaneously reducing the profile height of the satellite antenna are constant targets in the field of satellite antenna design.

SUMMERY OF THE UTILITY MODEL

The utility model provides a two circular polarization plate satellite antenna of wide band further increases the work bandwidth (reaching 30% central bandwidth) and the gain of two circular polarization plate waveguide array satellite antenna, further reduces plate satellite antenna's profile height (accomplish minimum thickness of present industry <48mm), optimizes plate satellite antenna's feed network structure, improves antenna opening face radiant efficiency (being close to 100%).

In order to realize the utility model discloses an aim, the technical scheme who adopts is: a broadband dual-circularly-polarized flat satellite antenna comprises a dual-linearly-polarized flat satellite antenna and a 3dB equal power distribution bridge with a 90-degree phase difference, wherein the 3dB equal power distribution bridge with the 90-degree phase difference is integrated with a total port of the dual-linearly-polarized flat satellite antenna, and the 3dB equal power distribution bridge with the 90-degree phase difference is used for converting dual-circularly-polarized signals and dual-linearly-polarized signals.

As the utility model discloses an optimization scheme, dual linear polarization flat satellite antenna includes antenna hood layer, opening radiation waveguide array layer and the network feed layer that from the top down installed in proper order, and the network feed layer includes horizontal polarization feed network layer and vertical polarization feed network layer.

As the optimization scheme of the utility model, the thickness of wide band double circular polarization flat satellite antenna is <48 mm.

As the utility model discloses an optimization scheme, opening radiation waveguide array layer comprises a plurality of waveguide radiating element, single waveguide radiating element includes the last oral area of opening waveguide unit, the subwavelength radiation opening, the resonant cavity that metal pillar and rectangular resonator and internal diameter dwindled, the rectangular resonator sets up the below at the last oral area of opening waveguide unit, the metal pillar sets up the center at waveguide radiating element, the resonant cavity setting that the internal diameter dwindled is in the below of rectangular resonator, the metal pillar is used for increasing the impedance matching of the last oral area of rectangular resonator and opening waveguide unit.

As the utility model discloses an optimization scheme, horizontal polarization feed network layer includes first horizontal polarization coupling chamber, the waveguide transmission mouth of four unit antenna subarrays of horizontal polarization, the second horizontal polarization coupling chamber that the internal diameter dwindles, first horizontal polarization transmission mouth, second horizontal polarization transmission mouth, one minute two power distribution waveguide network of horizontal final stage one minute two power distribution waveguide network and four unit antenna subarrays of level, horizontal final stage one minute two power distribution waveguide network passes through horizontal rectangular slit with horizontal polarization electromagnetic wave coupling to the first horizontal polarization coupling chamber that links to each other with self, horizontal rectangular slit sets up on the lateral wall of first horizontal polarization coupling chamber.

As the utility model discloses an optimization scheme, vertical polarization feed network layer includes the vertical polarization coupling chamber, the waveguide transmission mouth of the four unit antenna subarrays of vertical polarization, the vertical polarization coupling chamber that the internal diameter dwindles, first vertical polarization transmission mouth, second vertical polarization transmission mouth, perpendicular last stage one minute two power distribution waveguide network and the perpendicular one minute two power distribution waveguide network of four unit antenna subarrays of vertical, perpendicular last stage one minute two power distribution waveguide network passes through the perpendicular rectangle slit with the coupling of vertical polarization electromagnetic wave to the vertical polarization coupling chamber that links to each other with self in, perpendicular rectangle slit sets up on the lateral wall in vertical polarization coupling chamber.

As the utility model discloses an optimization scheme, wide band dual circular polarization flat satellite antenna includes that the total mouthful of horizontal polarization feed and vertical polarization feed are total mouthful, and the horizontal polarization signal divides the network to assemble the total mouthful of horizontal polarization feed through a plurality of grades of merits, and the vertical polarization signal divides the network to assemble the total mouthful of vertical polarization feed through a plurality of grades of merits, and horizontal polarization signal and vertical polarization signal divide the electric bridge through the merit such as 3dB that has 90 phase differences to polarize the synthesis, and the output is dual circular polarization signal.

The utility model discloses has positive effect: 1) the utility model discloses a 3dB equipower branch electric bridge and the dull and stereotyped satellite antenna integration of double-linear polarization that will have the 90 phase difference have realized the interconversion of double-linear polarization and two circular polarization electromagnetic wave signal. Existing designs implement circular polarization conversion by loading a circular polarizer in the waveguide, which is necessarily limited in bandwidth and efficiency. Therefore, the utility model is obviously superior to other designs in the working frequency band (30% central bandwidth) and the antenna radiation efficiency (about 100%);

2) the utility model discloses take into account the influence of antenna house to waveguide array antenna performance, make it not only as the protection part of antenna, more become electrical performance function piece, improved the gain of antenna, its profile thickness is thinnest for present industry.

3) The utility model provides a horizontal polarization feed network layer and vertical polarization feed network layer structure principle is simple, the channel is smooth, do not have sharp-pointed arch, and transmission loss is low and the working bandwidth to design manufacturing cost can further be reduced.

4) The utility model discloses loaded the metal column, further expanded waveguide radiating element's matching impedance bandwidth, made it cover wideer satellite frequency channel.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic diagram of a 3dB equipower-splitting bridge with a 90 phase difference;

FIG. 3 is a schematic diagram of a dual-linear polarization flat satellite antenna;

FIG. 4 is a top view of an open ended radiation waveguide array layer;

FIG. 5 is a schematic structural diagram of an array layer of open ended radiation waveguides;

FIG. 6 is a perspective view of an open ended radiation waveguide array layer;

FIG. 7 is a schematic structural diagram of a horizontally polarized feed network layer;

FIG. 8 is a top view of a horizontally polarized feed network layer;

FIG. 9 is a schematic diagram of the structure of a vertically polarized feed network layer;

FIG. 10 is a top view of a vertically polarized feed network layer;

fig. 11 is a schematic view of the back structure of the present invention;

fig. 12 is a standing wave ratio curve of the antenna of the present invention;

fig. 13 is the isolation between the two ports of the antenna of the present invention;

fig. 14 is an axial ratio bandwidth diagram of the antenna of the present invention;

fig. 15 is a gain curve for left-hand polarization and cross polarization of the antenna of the present invention;

fig. 16 is a gain curve of the right-hand polarization and its cross polarization of the antenna of the present invention.

Wherein: 1. a dual linearly polarized flat satellite antenna, 2, a 3dB equipower splitting bridge with a phase difference of 90 °, 11, an antenna cover layer, 12, an open radiation waveguide array layer, 131, a horizontal polarization feed network layer, 132, a vertical polarization feed network layer, 121, an upper port face of an open waveguide unit, 122, a subwavelength radiation aperture, 123, a metal pillar, 124, a rectangular resonant cavity, 125, a resonant cavity with a reduced inner diameter, 1311, a first horizontal polarization coupling cavity, 1312, a waveguide transmission port of a horizontally polarized four-element antenna sub-array, 1313, a second horizontal polarization coupling cavity with a reduced inner diameter, 1314, a first horizontal polarization transmission port, 1315, a second horizontal polarization transmission port, 1316, a horizontal final stage one-to-two power distribution waveguide network, 1317, a one-to-two power distribution waveguide network of a horizontal four-element antenna sub-array, 1321, a vertical polarization coupling cavity, 1322, a waveguide transmission port of a vertically polarized four-element antenna sub-array, 1323. the antenna array comprises a vertical polarization coupling cavity with a reduced inner diameter, 1324, a first vertical polarization transmission port, 1325, a second vertical polarization transmission port, 1326, a vertical final-stage one-to-two power distribution waveguide network, 1327, a one-to-two power distribution waveguide network of a vertical four-unit antenna sub-array, 3, a horizontal polarization feed total port, and 4, a vertical polarization feed total port.

Detailed Description

As shown in fig. 1-11, the utility model discloses a two circular polarization flat satellite antenna of wide band, including the double linear polarization flat satellite antenna 1 with have the 3dB equal power of 90 phase differences divide electric bridge 2, the 3dB equal power that has 90 phase differences divides electric bridge 2 and double linear polarization flat satellite antenna 1's total port mutually integrated, the 3dB equal power that has 90 phase differences divides electric bridge 2 to be used for the conversion of two circular polarization signals and double linear polarization signals. Wherein, the dual-linear polarization signal is a horizontal polarization electromagnetic wave signal and a vertical polarization electromagnetic wave signal. The dual circularly polarized signals are left-handed polarized electromagnetic wave signals and right-handed polarized electromagnetic wave signals. The working bandwidth of the 3dB equal-power-division bridge 2 with the 90-degree phase difference is superior to the original bandwidth of the antenna, the insertion loss is as small as possible, and when the 90-degree phase difference is formed, the standing wave performance of a port is required to be excellent, and the isolation performance between left-hand circular polarization and right-hand circular polarization is required to be excellent; in addition, the volume is small, and the integral integration of the product is easy.

As shown in fig. 3, the dual-linearly polarized flat satellite antenna 1 includes an antenna cover layer 11, an open radiation waveguide array layer 12, and a network feed layer, which includes a horizontally polarized feed network layer 131 and a vertically polarized feed network layer 132, mounted in this order from top to bottom. Wherein: the thickness of the antenna cover layer 11 is non-uniformly designed for improving antenna pattern characteristics.

4-6, the open-ended radiation waveguide array layer 12 is composed of several waveguide radiation units, each of which includes an upper opening 121, a sub-wavelength radiation opening 122, a metal pillar 123, a rectangular cavity 124 and a cavity 125 with a reduced inner diameter, the rectangular cavity 124 is disposed below the upper opening 121, the metal pillar 123 is disposed at the center of the waveguide radiation unit, the cavity 125 with a reduced inner diameter is disposed below the rectangular cavity 124, and the metal pillar 123 is used to increase the impedance matching between the rectangular cavity 124 and the upper opening 121, wherein the upper opening 121 is generally square or circular and may be designed as a hexagon or other symmetrical regular structure with chamfers₀，λ₀A free space wavelength corresponding to a center frequency), the sub-wavelength radiation openings 122 are also generally square or circular and may be designed as hexagons, octagons, or their symmetrical regular structures with chamfers.

The subdivision of the last oral area 121 of opening waveguide unit is four sub-wavelength radiation openings 122, also can dissect into the net of other shapes, like quadrangle, hexagon, octagon or its above-mentioned structure that has the chamfer, and the chamber wall of rectangle resonant cavity 124 is perpendicular metal wall, for waveguide unit array and satellite antenna production, the embodiment of the utility model discloses an chamfer processing has been taken to four right angles of rectangle. The metal pillar 123 is generally in a symmetrical regular shape such as a cylinder, a square column, or the like.

As shown in fig. 7-8, the horizontally polarized feed network layer 131 includes a first horizontally polarized coupling cavity 1311, a waveguide transmission port 1312 of the horizontally polarized four-element antenna sub-array, a second horizontally polarized coupling cavity 1313 with a reduced inner diameter, a first horizontally polarized transmission port 1314, a second horizontally polarized transmission port 1315, a horizontally final-stage one-to-two power distribution waveguide network 1316, and a one-to-two power distribution waveguide network 1317 of the horizontally four-element antenna sub-array, the horizontally final-stage one-to-two power distribution waveguide network 1316 couples the horizontally polarized electromagnetic wave into the first horizontally polarized coupling cavity 1311 connected to itself through a horizontal rectangular slit, and the horizontal rectangular slit is disposed on a sidewall of the first horizontally polarized coupling cavity 1311. By using horizontal rectangular slit transmission, the whole has the advantage of low profile.

As shown in fig. 9-10, the vertical polarization feeding network layer 132 includes a vertical polarization coupling cavity 1321, a waveguide transmission port 1322 of the vertical polarization four-element antenna sub-array, a vertical polarization coupling cavity 1323 with a reduced inner diameter, a first vertical polarization transmission port 1324, a second vertical polarization transmission port 1325, a vertical last-stage one-two power distribution waveguide network 1326, and a one-two power distribution waveguide network 1327 of the vertical four-element antenna sub-array, wherein the vertical last-stage one-two power distribution waveguide network 1326 couples the vertical polarization electromagnetic wave into the vertical polarization coupling cavity 1321 connected to itself through a vertical rectangular slit, and the vertical rectangular slit is disposed on a sidewall of the vertical polarization coupling cavity 1321. By using the vertical rectangular slit for transmission, the whole has the advantage of low profile.

The interface of the vertically polarized coupling cavity 1321 and the first horizontally polarized coupling cavity 1311 is a discontinuous structure. The horizontally polarized electromagnetic wave is evanescent wave in the vertically polarized coupling cavity 1321 and cannot be transmitted in the vertically polarized waveguide feed network; similarly, vertically polarized electromagnetic waves cannot propagate in a horizontally polarized waveguide feed network. Wherein, the horizontal polarization feed network layer 131 and the vertical polarization feed network layer 132 can exchange positions.

As shown in fig. 11, the broadband dual circularly polarized flat satellite antenna includes a horizontal polarization feed port 3 and a vertical polarization feed port 4, a horizontal polarization signal is converged to the horizontal polarization feed port 3 through a plurality of stages of power distribution networks, a vertical polarization signal is converged to the vertical polarization feed port 4 through a plurality of stages of power distribution networks, the horizontal polarization signal and the vertical polarization signal are polarized and synthesized through a 3dB equal power distribution bridge 2 having a phase difference of 90 degrees, and the signals are output as dual circularly polarized signals. The bridge enables the horizontal polarized wave and the vertical polarized wave input at the left side to have a phase difference of 90 degrees, so that a left-handed polarized wave or a right-handed polarized wave is obtained at the output end at the right side; and vice versa.

Electromagnetic signals enter a first horizontal polarization coupling cavity 1311 and a second horizontal polarization coupling cavity 1313 with the inner diameter being reduced, and screened horizontal polarization signals enter a horizontal polarization feed network from a waveguide transmission port 1312 of a horizontal polarization four-unit antenna sub-array; similarly, the other two horizontally polarized signals also enter the horizontally polarized feed network from the waveguide transmission port 1312 of the horizontally polarized four-element antenna sub-array, are combined through the horizontally final-stage one-to-two power distribution waveguide network 1316, enter the one-to-two power distribution waveguide network 1317 of the horizontally polarized four-element antenna sub-array, and are further input to the horizontally polarized feed main port 3.

Electromagnetic signals are screened by the first horizontal polarization coupling cavity 1311 and enter the vertical polarization coupling cavity 1321, and the horizontal polarization signals are evanescent waves in the coupling cavity and cannot be transmitted. The vertical polarization signal screened out by the vertical polarization coupling cavity 1321 enters the vertical polarization feed network from the waveguide transmission port 1322 of the vertical polarization four-unit antenna subarray; similarly, the other two vertical polarization signals enter the vertical polarization feed network from the first vertical polarization transmission port 1324 and the second vertical polarization transmission port 1325, are combined by the vertical final-stage one-to-two power distribution waveguide network 1326, enter the one-to-two power distribution waveguide network 1327 of the vertical four-element antenna sub-array, and are further input to the vertical polarization feed main port 4. Below the first horizontally polarized coupling cavity 1311 is a vertically polarized coupling cavity 1321.

The horizontal polarization feed network layer 131 can be designed to be vertically polarized, the vertical polarization feed network layer 132 can also be designed to be horizontally polarized, as long as the polarization mode corresponds to each other, and the implementation mode of the network feed layer also includes different forms such as a waveguide, a microstrip line, a suspended strip line, and the like.

The above working mechanism is expressed by taking the electromagnetic signal reception as an example, on the contrary, when the broadband dual circularly polarized flat satellite antenna is used for transmitting the electromagnetic signal, the circularly polarized electromagnetic wave signal is polarized and decomposed into horizontally polarized and vertically polarized electromagnetic waves by the 3dB equipower distribution bridge 2 with a phase difference of 90 degrees, enters the horizontally polarized feed main port 3 and the vertically polarized feed main port 4, and is distributed to each waveguide radiation unit through a plurality of stages to two power distribution networks for radiation.

FIG. 12 is a standing-wave ratio curve of the broadband dual circularly polarized flat satellite antenna of the present invention, which operates in Ku band, with return loss lower than-20 dB at 12.25-14.75 GHz; and the return loss at the typical receiving and transmitting frequency band of 12.25-12.75 GHz and 14.0-14.5 GHz is lower than-25 dB.

Fig. 13 shows the isolation between two ports of the broadband dual circularly polarized flat satellite antenna of the present invention. The isolation at typical receiving and transmitting frequency bands of a Ku wave band of 12.25-12.75 GHz and 14.0-14.5 GHz is lower than-20 dB.

Fig. 14 is an axial ratio bandwidth diagram of the broadband dual circularly polarized flat satellite antenna of the present invention. The axial ratio of the Ku band at 12.00-14.75 GHz is lower than 2, and the Ku band has good circular polarization characteristics.

Fig. 15 is a left-hand polarization and cross-polarization gain curve of the broadband dual circularly polarized flat satellite antenna of the present invention. The cross polarization ratio at a typical transmitting-receiving frequency band of a Ku wave band of 12.25-12.75 GHz and 14.0-14.5 GHz is more than 35 dB.

Fig. 16 is a gain curve of the right-hand polarization and the cross polarization of the broadband dual circularly polarized flat satellite antenna of the present invention. The cross polarization ratio at a typical receiving and transmitting frequency band of a Ku wave band of 12.25-12.75 GHz and at a position of 14.0-14.5 GHz is more than 35 dB; the effectiveness of the utility model is fully verified.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (7)

1. A broadband dual-circularly-polarized flat satellite antenna is characterized in that: the dual-polarization flat satellite antenna comprises a dual-polarization flat satellite antenna (1) and a 3dB equal power division bridge (2) with a 90-degree phase difference, wherein the 3dB equal power division bridge (2) with the 90-degree phase difference is integrated with a total port of the dual-polarization flat satellite antenna (1), and the 3dB equal power division bridge (2) with the 90-degree phase difference is used for converting dual-circular polarization signals and dual-linear polarization signals.

2. The broadband dual circularly polarized flat satellite antenna according to claim 1, wherein: the dual-linear polarization flat satellite antenna (1) comprises an antenna cover layer (11), an opening radiation waveguide array layer (12) and a network feed layer which are sequentially arranged from top to bottom, wherein the network feed layer comprises a horizontal polarization feed network layer (131) and a vertical polarization feed network layer (132).

3. The broadband dual circularly polarized flat satellite antenna according to claim 2, wherein: the thickness of the broadband dual-circularly-polarized flat satellite antenna is less than 48 mm.

4. The dual-circular polarization broadband flat satellite antenna of claim 2 or 3, wherein: the open radiation waveguide array layer (12) is composed of a plurality of waveguide radiation units, each waveguide radiation unit comprises an upper opening surface (121) of each open waveguide unit, a sub-wavelength radiation opening (122), a metal pillar (123), a rectangular resonant cavity (124) and a resonant cavity (125) with a reduced inner diameter, the rectangular resonant cavity (124) is arranged below the upper opening surface (121) of each open waveguide unit, the metal pillar (123) is arranged at the center of each waveguide radiation unit, the resonant cavity (125) with the reduced inner diameter is arranged below the rectangular resonant cavity (124), and the metal pillar (123) is used for increasing impedance matching of the rectangular resonant cavity (124) and the upper opening surface (121) of each open waveguide unit.

5. The broadband dual circularly polarized flat satellite antenna according to claim 4, wherein: the horizontal polarization feed network layer (131) comprises a first horizontal polarization coupling cavity (1311), a waveguide transmission port (1312) of a horizontal polarization four-unit antenna sub-array, a second horizontal polarization coupling cavity (1313) with a reduced inner diameter, a first horizontal polarization transmission port (1314), a second horizontal polarization transmission port (1315), a horizontal last-stage one-to-two power distribution waveguide network (1316) and a one-to-two power distribution waveguide network (1317) of the horizontal four-unit antenna sub-array, wherein the horizontal last-stage one-to-two power distribution waveguide network (1316) couples horizontal polarization electromagnetic waves into the first horizontal polarization coupling cavity (1311) connected with the horizontal last-stage one-to-two power distribution waveguide network through a horizontal rectangular slit, and the horizontal rectangular slit is arranged on the side wall of the first horizontal polarization coupling cavity (1311).

6. The broadband dual circularly polarized flat satellite antenna according to claim 5, wherein: the vertical polarization feed network layer (132) comprises a vertical polarization coupling cavity (1321), a waveguide transmission port (1322) of a vertical polarization four-unit antenna subarray, a vertical polarization coupling cavity (1323) with a reduced inner diameter, a first vertical polarization transmission port (1324), a second vertical polarization transmission port (1325), a vertical final-stage one-to-two power distribution waveguide network (1326) and a one-to-two power distribution waveguide network (1327) of the vertical four-unit antenna subarray, wherein the vertical final-stage one-to-two power distribution waveguide network (1326) couples vertical polarization electromagnetic waves into the vertical polarization coupling cavity (1321) connected with the vertical final-stage one-to-two power distribution waveguide network through a vertical rectangular slit, and the vertical rectangular slit is arranged on the side wall of the vertical polarization coupling cavity (1321).

7. The broadband dual circularly polarized flat satellite antenna according to claim 6, wherein: the broadband dual-circular-polarization flat satellite antenna comprises a horizontal polarization feed main port (3) and a vertical polarization feed main port (4), horizontal polarization signals are converged to the horizontal polarization feed main port (3) through a plurality of levels of power distribution networks, vertical polarization signals are converged to the vertical polarization feed main port (4) through a plurality of levels of power distribution networks, the horizontal polarization signals and the vertical polarization signals are subjected to polarization synthesis through a 3dB equal power distribution bridge (2) with a 90-degree phase difference, and dual-circular-polarization signals are output.

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