Light dual-polarized array antenna

Abstract

The invention provides a light dual-polarized array antenna, and relates to the technical field of communication antennas. The square-opening loudspeaker comprises a square-opening loudspeaker layer, a printed board, a horizontal polarization layer, a resonance layer and a vertical polarization layer which are sequentially arranged from top to bottom. The square-opening horn layer, the horizontal polarization layer, the resonance layer and the vertical polarization layer are all of metal structures, a feed network is formed on the upper surface of the printed board through a copper-clad strip line, the combining end of the feed network extends to the edge of the printed board, and a signal is guided to the outside through a connector. And four shunt ends of the feed network are respectively positioned below the four horn mouth radiation units. The communication device has the characteristics of lightweight design, compact structure and detachability, is convenient to carry and deploy, has high environmental adaptability, can keep good communication performance in various terrains such as mountainous areas, jungles, deserts and cities, and is convenient to operate and maintain.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication antennas, in particular to a light-weight, low-cost portable satellite communication antenna. BACKGROUND

[0002] Currently, the frequency spectrum of communication in the field of satellite communication is becoming wider and wider, and the requirements for radio frequency terminals are becoming higher and higher, which requires the working bandwidth of the antenna to be gradually widened. Satellite communication and navigation communication systems often require devices to have signal receiving and transmitting functions, and the frequency bands and polarizations of the received and transmitted signals are different. The requirements for antennas are multi-frequency, dual-polarized wideband operation.

[0003] A satellite communication portable station usually needs to meet the characteristics of dual polarization, light weight, and high G / T value. In order to obtain a high G / T value, it is necessary to realize dual-polarized high-efficiency radiation, low feeder loss, low noise temperature, and low-profile compact structure. The degree of excellence of its performance directly affects the quality of satellite communication.

[0004] The satellite communication array antenna in the prior art mainly has the following problems:

[0005] 1. Material and manufacturing limitations

[0006] Weight and cost problems: Traditional antennas mostly use metal materials (such as aluminum and copper), which results in heavy equipment (such as UHF band monopole antennas requiring complex ground plane design), increasing transportation and deployment difficulty; metal processing technology is complex and the cost is high.

[0007] Insufficient corrosion resistance: Metal oscillators are easily corroded in harsh environments (such as salt spray and high temperature environment), affecting long-term reliability.

[0008] 2. Poor system closure and interoperability

[0009] Specialized design: Traditional military satellite communication systems are mostly closed architectures, and different manufacturers' equipment has poor compatibility, making it difficult to achieve data sharing and collaborative operation of multiple types of satellites or ground systems.

[0010] Lack of flexibility: Special ground terminals only support single satellite system operation and cannot dynamically adapt to multiple orbits (GEO / MEO / LEO) or different frequency band requirements.

[0011] 3. Communication performance bottleneck

[0012] Bandwidth and coverage limitations:

[0013] Satellite relay devices are large in size and high in cost, making it difficult to adapt to mobile platforms such as unmanned aerial vehicles;

[0014] 5G millimeter wave (covers about 1500 feet), Wi-Fi / Bluetooth (802.11) and other short-range communication technologies have the problems of insufficient coverage and weak anti-interference ability.

[0015] 4. Antenna design is not adaptive enough

[0016] Fixed architecture limitation: traditional parabolic antenna, phased array antenna and other complex mechanical structures are difficult to meet the needs of rapid deployment of portable stations and mobile communication.

[0017] Polarization efficiency problem: dual-polarized antenna relies on orthogonal arrangement of metal dipoles, which is prone to cross-polarization interference (XPD performance degradation) due to processing errors, and the dipole structure is difficult to process and assemble at Ku / Ka band, which is not suitable for passive array antenna. SUMMARY

[0018] Therefore, the present application provides a lightweight dual-polarized array antenna. The present application realizes dual-polarized array antenna through square horn radiation unit structure, which has the characteristics of high radiation efficiency, low transmission loss, lightweight, low profile and low cost.

[0019] Based on the above purpose, the technical scheme provided by the present application is:

[0020] A lightweight dual-polarized array antenna, comprising square horn layer 1, printed board 2, horizontal polarization layer 3, resonant layer 4 and vertical polarization layer 5 arranged in order from top to bottom; square horn layer 1, horizontal polarization layer 3, resonant layer 4 and vertical polarization layer 5 are all metal structures;

[0021] Square horn layer 1 is 2x2 arranged four horn mouth radiation units;

[0022] The upper surface of printed board 2 forms a feed network through copper strip line, the combining end of the feed network extends to the edge of printed board 2, and the signal is guided to the outside through the connector, and the four branch ends of the feed network are located below the four horn mouth radiation units respectively;

[0023] Horizontal polarization layer 3 has four rectangular waveguide cavities below the four horn mouth radiation units, and each of the two sides of the bottom of the rectangular waveguide cavity parallel to the horizontal polarization direction has a step structure, which divides the rectangular waveguide cavity into an upper half large waveguide cavity 302 and a lower half small waveguide cavity 303;

[0024] Resonant layer 4 has a rectangular recess 401, and a matching structure 402, 403 extends from the midpoint of the four edges of the rectangular recess 401 to the center of the rectangular recess respectively, the opposite two matching structures are mirror symmetric, and the bottom of the rectangular recess 401 has a coupling gap 404 between the two matching structures 403 parallel to the horizontal polarization direction.

[0025] The vertical polarization layer 5 has a rectangular waveguide cavity 501, the rectangular waveguide cavity 501 of the vertical polarization layer 5 is located in the projection range of the rectangular groove of the resonance layer 4, and the projection of the coupling gap 404 is located at a corner of the rectangular waveguide cavity 501 of the vertical polarization layer 5; the rectangular waveguide cavity 501 of the vertical polarization layer 5 is in the form of H-plane waveguide trace, and is in a short-circuit closed structure.

[0026] Further, the horn mouth radiation unit is divided into upper and lower parts, the upper part is a radiation horn mouth 101, and the lower part is a feeding square waveguide 102; the cross sections of the radiation horn mouth 101 and the feeding square waveguide 102 are both square; the aperture size of the radiation horn mouth 101 is 0.86λ0, the aperture size of the feeding square waveguide 102 is smaller than that of the radiation horn mouth 101; the center distance between adjacent two horn mouth radiation units is 0.866λ0, and λ0 is the signal wavelength; the feeding square waveguide 102 of each horn mouth radiation unit is aligned with four edges of the large waveguide cavity 302 of the horizontal polarization layer 3 below.

[0027] Further, the upper surface of the horizontal polarization layer 3 has a groove 301 wrapping a feeding network, and the bottom surface of the square horn layer has a mirror image groove; the grooves of the horizontal polarization layer 3 and the square horn layer together form a stripline shielding cavity wrapping the feeding network; four branch ends of the feeding network extend to the outside of the stripline shielding cavity and are located below the four horn mouth radiation units respectively.

[0028] Further, the feeding network includes one trunk stripline 201, two branch striplines 202, two 180-degree phase inversion loops 203, and four probe striplines 204; the two branch striplines 202 are located at the same end of the trunk stripline 201 and extend in opposite directions; the other end of the trunk stripline 201 extends to the edge of the printed board 2 and is a combining end; the ends of the branch striplines 202 are respectively connected to one probe stripline 204 and one 180-degree phase inversion loop 203; the end of the 180-degree phase inversion loop 203 is connected to the other probe stripline 204; the end of the probe stripline 204 is a branch end; the entire feeding network is in a symmetrical structure relative to the trunk stripline 201; the directions of the four probe striplines 204 are parallel to the horizontal polarization direction; the electrical length of the 180-degree phase inversion loop 203 is 0.5λg, and λg is the signal transmission wavelength of the feeding network.

[0029] Further, the edge length of the small waveguide cavity 303 perpendicular to the horizontal polarization direction is 0.42λ0, and the orthographic projection of the four small waveguide cavities 303 is located at the four corners of the rectangular groove 401 of the resonance layer 4.

[0030] Further, the rectangular groove 401 of the resonance layer 4 has a depth of 0.025λ0, and the coupling gap 404 has a length of 0.34λ0 and a width of 1.5mm.

[0031] The beneficial effects of the technical scheme of the present application are as follows:

[0032] 1. The lightweight dual-polarized array antenna device has the characteristics of lightness, thinness, simple structure and low loss compared with the conventional waveguide structure dual-polarized array antenna.

[0033] 2. The lightweight dual-polarized array antenna device has a wide operating frequency band, dual-polarized operation, high isolation, and can meet the technical requirements of portable satellite communication systems for lightweight, high efficiency radiation and high G / T value. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly describe the present patent, a plurality of drawings are provided below, which are intended to assist in describing the technical principles and / or certain specific embodiments of the present application.

[0035] Fig. 1 is a three-dimensional external structure schematic diagram of the lightweight dual-polarized array antenna in the embodiment of the present application;

[0036] Fig. 2 is a layered structure schematic diagram of the lightweight dual-polarized array antenna in the embodiment of the present application;

[0037] Fig. 3 is a structure schematic diagram of the square mouth horn layer in the embodiment of the present application;

[0038] Fig. 4 is a structure schematic diagram of the printed board in the embodiment of the present application;

[0039] Fig. 5 is a structure schematic diagram of the horizontal polarization layer in the embodiment of the present application;

[0040] Fig. 6 is a structure schematic diagram of the resonance layer in the embodiment of the present application;

[0041] Fig. 7 is a structure schematic diagram of the vertical polarization layer in the embodiment of the present application;

[0042] Fig. 8 is a position relationship schematic diagram of the rectangular groove of the resonance layer and the coupling gap of the resonance layer in the embodiment of the present application. DETAILED DESCRIPTION

[0043] For the convenience of the engineering technicians in the art to understand the technical solutions of the present application, to make the technical solutions and beneficial effects of the present application more clear, and to fully support the protection scope of the claims, the technical solutions of the present application are further explained in more detail in the form of specific cases.

[0044] A lightweight dual-polarized array antenna, as shown in Figs. 1-8 is mainly composed of a five-layer structure, which includes a square horn layer 1, a printed board 2, a horizontal polarization layer 3, a resonance layer 4, and a vertical polarization layer 5. The antenna is in the form of a 2x2 array and can be used as a subarray of a high-gain array antenna.

[0045] The square horn layer 1 is arranged at the uppermost part of the antenna structure and has a square cavity radiation structure. Four horn mouth radiation units are arranged in a 2x2 array. The horn mouth radiation units are composed of upper and lower parts, both of which are square cavity structures and are respectively a radiation horn mouth 101 and a feeding square waveguide 102.

[0046] The horizontal polarization layer 3 is located below the square horn layer 1, and the printed board 2 is sandwiched between the square horn layer 1 and the horizontal polarization layer 3. The printed board 2 and the horizontal polarization layer 3 function to excite horizontal polarization signals.

[0047] The resonance layer 4 is located below the horizontal polarization layer 3 and has a rectangular recess 401. The rectangular recess 401 is provided with matching structures 402 and 403 and a coupling slot 404. The upper surface of the resonance layer 4 is closely connected to the lower surface of the stepped cavity structure of the horizontal polarization layer 3 to form an electromagnetic structure for signal excitation and transmission.

[0048] The coupling slot 404 is arranged at the center of the rectangular recess 401 and has a rectangular cavity structure with its long side parallel to the long side of the rectangular recess 401.

[0049] The vertical polarization layer 5 has a rectangular waveguide cavity 501, which is located below the coupling slot 404. The coupling slot 404 is located at a corner of the rectangular waveguide cavity 501. One long side and one short side of the coupling slot 404 coincide with two corresponding sides of the rectangular waveguide cavity 501 to form a strong coupling structure.

[0050] The above-mentioned structures constitute the main structure of the lightweight dual-polarized array antenna. The layers are assembled by screw connection. The upper part is used for signal radiation and reception, and the lower part is used for signal input and output. It can be used as a subarray for array expansion to improve the gain of the antenna.

[0051] The following is a more specific example:

[0052] A lightweight dual-polarized array antenna, as shown in Figs. 1-8As shown, including square mouth horn layer 1, printed board 2, horizontal polarization layer 3, resonant layer 4 and vertical polarization layer 5, the above structure adopts screw assembly, realizes high-precision, tight-fit assembly of each part structure, and meets the requirements of antenna electrical performance index. The antenna is in the form of 2x2 array, can be expanded as a subarray of high-gain array antenna, and meets the antenna demand of different systems.

[0053] The square mouth horn layer 1 is an array of four horn mouth radiation units arranged in 2x2, and is a whole metal aluminum structure, the aperture size is 0.86λ0, the center distance between the horn mouth radiation units is 0.866λ0, that is, the wall thickness between the horn mouth radiation units is 0.006λ0, and the spacing can obtain the optimal array radiation efficiency. The horn mouth radiation unit is divided into upper and lower parts, the upper part is a radiation horn mouth 101, and the lower part is a feeding square waveguide 102, the cross sections of the radiation horn mouth 101 and the feeding square waveguide 102 are both square. The feeding square waveguide 102 has two functions: 1) as a feeding waveguide for vertical polarization horn radiation signals; 2) as part of the horizontal polarization feeding network. The square mouth horn layer 1 can be processed by numerical control machining process.

[0054] The horizontal polarization layer 2 is arranged directly below the square mouth horn layer 1, and the printed board 3 is clamped between the square mouth horn layer 1 and the horizontal polarization layer 3, the upper surface of the printed board 3 is covered with copper to construct a strip line guide structure, and the lower surface is without pattern,

[0055] The line on the upper surface is used to realize a horizontal polarization feeding power synthesis network, that is, a one-to-four form of feeding network, four end feed lines extend into the square cavity structure of the feeding square waveguide 102 and the large waveguide cavity 302 of the horizontal polarization layer 3, and the end feed lines are directed in parallel with the horizontal polarization direction, wherein the two lines in the vertical direction are directed in the same direction, and the other two lines are opposite to the two lines by 180°, and a 180° phase inversion ring 203 is arranged between the two end lines in opposite directions. The electrical length of the 180° phase inversion ring 203 is half a wavelength, and the function is to adjust the phase of the two same polarization direction electromagnetic wave signals with opposite initial phases to be in phase and superimposed. Another pair of feed lines is also arranged, and finally the one-to-two equal-amplitude and in-phase power divider is used to complete the synthesis of the horizontal polarization signals of the four radiation horn mouth units, and the signal synthesis is realized at the end of the synthesis strip line.

[0056] In order to construct a strip line transmission line structure, a strip line shielding cavity is arranged on the lower surface of the square mouth horn layer 1 and the upper surface of the horizontal polarization layer 3, and the longitudinal section (i.e. side view) is rectangular, which is divided into upper and lower shielding cavities by the printed board 2, the line path is consistent with the printed board line, and the longitudinal section has a length of 4mm and a width of 2mm. According to the strip line impedance theory, the impedance of the strip line can be adjusted by adjusting the line width of the printed board line, so as to realize the matching of the input impedance of the radiator.

[0057] The 180-degree inverting loop 203 has two functions:

[0058] 1) Compared with the in-phase synthesis network, the layout space can be saved, and the secondary synthesis network layout path is at the center position between the radiating units;

[0059] 2) The reverse feedback can effectively suppress the cross-polarization level.

[0060] The bottom of each rectangular waveguide cavity of the horizontal polarization layer 3 is provided with two step structures parallel to the horizontal polarization direction, and the two step structures divide the rectangular waveguide cavity into an upper half large waveguide cavity 302 and a lower half small waveguide cavity 303. The large waveguide cavity 302 is a square cavity, the long side of the small waveguide cavity 303 is consistent with the side length of the large waveguide cavity 302, parallel to the horizontal direction, and the length of the narrow side is 0.42λ0. The depth of the small waveguide cavity 303 can be optimized according to the needs, and the embodiment is not specially limited. The four small waveguide cavities 303 are primary radiating units of the vertical polarization signal, and the projections thereof are located at the four right-angle positions of the rectangular recess 401 of the resonance layer 4. A group of long and short sides of the small waveguide cavity 303 coincide with the corresponding sides of the rectangular recess 401 of the resonance layer 4.

[0061] The resonance layer 4 is arranged below the horizontal polarization layer 3, the depth of the rectangular recess 401 of the resonance layer 4 is 0.025λ0, the size of the long side and the short side is limited by the structure arrangement of the large waveguide cavity 302 and the small waveguide cavity 303, and two matching structures 402 and 403 are arranged in the recess. The matching structure 403 at the midpoint of the short side of the rectangular recess 401 extends to the inside of the recess until the edge of the coupling gap 404, and the width of the matching structure 403 is optimized according to the needs, and the embodiment is not specially limited. The matching structure 402 at the midpoint of the long side of the rectangular recess 401 also extends to the inside of the recess, and the length and width thereof are not specially limited and can be optimized according to the needs.

[0062] The coupling gap 404 is arranged at the geometric center of the rectangular recess 401 of the resonance layer 4, has a length of 0.34λ0, and the width and depth parameters are not specially limited, and the extension direction is parallel to the long side of the rectangular recess 401.

[0063] The vertical polarization layer 5 has a rectangular waveguide cavity 501, which is in the form of H-plane waveguide layout and is located below the coupling gap 404. The coupling gap 404 is located at a corner of the rectangular waveguide cavity 501, and a group of long and short sides of the coupling gap 404 coincide with the corresponding sides of the rectangular waveguide cavity 501. The rectangular waveguide cavity 501 is a short-circuit closed structure, and serves as a receiving and transmitting port of the vertical polarization signal.

[0064] The above-mentioned parts are assembled in the order from top to bottom by means of screw locking, wherein the strip line outlet can be switched to a coaxial or waveguide interface as required, which is well known and will not be described in detail herein.

[0065] The lightweight dual-polarized array antenna adopts printed board and waveguide feed line forms to achieve dual-polarized radiation of the antenna, has compact overall structure, low profile, and the metal structure can be designed to be lightweight through plastic metallization process. Compared with the traditional waveguide form dual-polarized array antenna, it is lighter and thinner, and is more suitable for portable satellite communication antenna systems, and has obvious technical advantages. The lightweight dual-polarized array antenna can be used as a basic unit of a large array antenna, and can be expanded to realize the improvement of gain.

[0066] The working principle of the lightweight dual-polarized array antenna is as follows:

[0067] When the transmitting signal enters the rectangular waveguide cavity 501 of the vertical polarization layer 5, the signal is fed into the coupling slot 404 through the waveguide feed line, and the signal is strongly excited in the high-density distribution area of the waveguide current. The signal resonates in the rectangular groove 401 of the resonant layer 4 and generates equal-amplitude and in-phase radiation signals on the stepped cavity of the horizontal polarization layer 3, so as to ensure equal-amplitude and in-phase radiation of the 2x2 radiation horn mouth, and the radiation efficiency is relatively optimized. The electromagnetic signals of the stepped cavity are further improved in the effective radiation aperture area through the radiation horn mouth 101 of the horn mouth radiation unit in the square horn layer 1, and effective radiation is realized in a specific frequency range, so as to achieve the effect of high-efficiency radiation. This process is the vertical polarization radiation mechanism.

[0068] The horizontal polarization signal is fed into the feeding square waveguide 102 of the lower half of the horn mouth radiation unit through the end line of the strip line feed network, so as to realize effective excitation of the horizontal polarization electromagnetic wave mode, and the vertical polarization resonant layer and the like structure serve as a short-circuit surface of the horizontal polarization signal, so as to ensure directional radiation of the horizontal polarization signal, so as to realize the feed and radiation electromagnetic structure of the horizontal polarization mode.

[0069] In summary, the dual-polarized array antenna in this form combines the waveguide feed network and the strip line feed network to complete the radiation of the dual-polarized antenna mode, achieves low profile, high efficiency and high isolation of the antenna, realizes low profile design in structure, and lays a foundation for lightweight design of the antenna. Further, the weight and cost of the antenna can be further reduced by means of plastic metallization process.

[0070] The present application has the characteristics of lightweight design, compact structure and detachability, is convenient to carry and deploy, has strong environmental adaptability, can maintain good communication performance in mountainous areas, jungles, deserts, cities and various terrains, and is convenient to operate and maintain.

[0071] It should be understood that the above description of the specific embodiments of the present application is merely illustrative and is not intended to limit the scope of the present application. Any person skilled in the art can make further embodiments of the present application without any creative effort, by combining the technical features of the embodiments listed in the present application, replacing some of the technical features, adding more technical features, etc. All these embodiments shall fall within the scope of the present application and shall be covered by the protection of the present application.

[0072] In addition, for the purpose of simplifying the description, the present application can not list some common embodiments which can be naturally thought of by those skilled in the art after understanding the technical scheme of the present application. Obviously, these embodiments shall also be included in the protection scope of the present application.

[0073] For the purpose of simplifying the description, the above embodiments can only reach the level of technical details which can be decided by the person skilled in the art, i.e. the technical details not disclosed in the above embodiments can be completed by the person skilled in the art without any creative effort, with the sufficient hint of the technical scheme of the present application, by means of textbooks, reference books, papers, patents, audio-visual products and other disclosed documents, or these details can be decided by the person skilled in the art according to the actual situation. It can be seen that even if these technical details are not disclosed, it will not affect the sufficiency of the disclosure of the technical scheme of the present application.

[0074] In summary, on the basis of the explanation of the protection scope of the claims in the present application, any embodiment falling within the scope of the claims of the present application shall be within the protection scope of the present application.

Claims

1. A lightweight dual-polarized array antenna, characterized in that, It includes a square-mouth horn layer (1), a printed circuit board (2), a horizontal polarization layer (3), a resonant layer (4), and a vertical polarization layer (5) arranged sequentially from top to bottom; the square-mouth horn layer (1), the horizontal polarization layer (3), the resonant layer (4), and the vertical polarization layer (5) are all metal structures; The square-mouth horn layer (1) consists of four horn-mouth radiating units arranged in a 2×2 pattern; The upper surface of the printed circuit board (2) forms a power supply network through copper-clad strip lines. The combining end of the power supply network extends to the edge of the printed circuit board (2) and guides the signal to the outside through connectors. The four branch ends of the power supply network are located below the four horn-shaped radiating units respectively. The horizontal polarization layer (3) has four rectangular waveguide cavities located below the four horn-shaped radiating units. Each of the two sides of the bottom of the rectangular waveguide cavity that are parallel to the horizontal polarization direction has a step structure. The step structure divides the rectangular waveguide cavity into a large waveguide cavity (302) in the upper part and a small waveguide cavity (303) in the lower part. The resonant layer (4) has a rectangular groove (401). At the midpoint of the four sides of the rectangular groove (401), a matching structure (402, 403) extends towards the center of the rectangular groove. The two matching structures are mirror symmetrical. At the bottom of the rectangular groove (401), there is a coupling gap (404) connecting the two matching structures (403) that are parallel to the horizontal polarization direction. The vertical polarization layer (5) has a rectangular waveguide cavity (501). The rectangular waveguide cavity (501) of the vertical polarization layer (5) is located within the projection range of the rectangular groove of the resonant layer (4), and the projection of the coupling gap (404) is exactly located at one corner of the rectangular waveguide cavity (501) of the vertical polarization layer (5). The rectangular waveguide cavity (501) of the vertical polarization layer (5) is in the form of H-plane waveguide trace and is a short-circuit closed structure.

2. The lightweight dual-polarized array antenna according to claim 1, characterized in that, The horn-shaped radiating unit is divided into two parts: the upper part is the radiating horn (101), and the lower part is the feeding square waveguide (102). The cross-sections of the radiating horn (101) and the feeding square waveguide (102) are both square. The aperture size of the radiating horn (101) is 0.86λ0, and the aperture size of the feeding square waveguide (102) is smaller than that of the radiating horn (101). The center distance between two adjacent horn-shaped radiating units is 0.866λ0, where λ0 is the signal wavelength. The feeding square waveguide (102) of each horn-shaped radiating unit is aligned with the four sides of the large waveguide cavity (302) of the horizontal polarization layer (3) below it.

3. A lightweight dual-polarized array antenna according to claim 1, characterized in that, The upper surface of the horizontal polarization layer (3) has a groove (301) that wraps the feed network, and the bottom surface of the square-mouth horn layer has a mirrored groove. The grooves of the horizontal polarization layer (3) and the square-mouth horn layer together form a stripline shielding cavity that wraps the feed network. The four branch ends of the feed network extend to the outside of the stripline shielding cavity and are located below the four horn-mouth radiating units respectively.

4. A lightweight dual-polarized array antenna according to claim 1, characterized in that, The power supply network includes a main stripline (201), two branch striplines (202), two 180-degree phase inversion loops (203), and four probe striplines (204). The two branch striplines (202) are located at the same end of the main stripline (201) and extend in opposite directions. The other end of the main stripline (201) extends to the edge of the printed circuit board (2) and is the junction end. The ends of the branch striplines (202) are respectively connected to a probe stripline. (204) and a 180-degree phase inversion loop (203), the end of the 180-degree phase inversion loop (203) is connected to another probe stripline (204), the end of the probe stripline (204) is the branch end; the entire feed network is symmetrical with respect to the main stripline (201); the directions of the four probe striplines (204) are all parallel to the horizontal polarization direction, the electrical length of the 180-degree phase inversion loop (203) is 0.5λg, λg is the signal transmission wavelength of the feed network.

5. A lightweight dual-polarized array antenna according to claim 1, characterized in that, The side length of the small waveguide cavity (303) perpendicular to the horizontal polarization direction is 0.42λ0, and the orthographic projection of the four small waveguide cavities (303) is located at the four corners of the rectangular groove (401) of the resonant layer (4).

6. A lightweight dual-polarized array antenna according to claim 1, characterized in that, The rectangular groove (401) of the resonant layer (4) has a depth of 0.025λ0, a coupling gap (404) with a length of 0.34λ0 and a width of 1.5mm.

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