High-integration-level in-band out-of-band low RCS transmission array antenna

Abstract

The invention relates to the technical field of radars and antennas, in particular to a high-integration-level in-band and out-of-band low RCS transmission array antenna. The transmission array antenna comprises a feed source and a transmission array. The transmission array comprises a plurality of radiation units and a dielectric substrate used for supporting the radiation units. The radiation unit comprises an A-type radiation unit and a B-type radiation unit; the dielectric substrate is divided into four quadrant regions with the same area; a plurality of A-type radiation units are periodically arranged in the second quadrant area and the fourth quadrant area at equal intervals, and a plurality of B-type radiation units are periodically arranged in the first quadrant area and the third quadrant area at equal intervals. On the basis of a traditional transmission array antenna, in-band and out-of-band RCS reduction capacity is achieved, the integration level of the overall structure is improved, and in addition, the application range and the action depth of the transmission array antenna are greatly improved.

Description

Technical Field

[0001] The present application relates to the field of radar and antenna technology, and in particular to a highly integrated in-band and out-of-band low RCS transmission array antenna. Background Art

[0002] As the competition for electromagnetic power intensifies, the electromagnetic transceiver capability and electromagnetic stealth performance of equipment need to be further improved to adapt to different application scenarios. After strict shape optimization and the application of absorbing materials, the radar cross section (RCS) of the equipment has been significantly reduced. However, the RCS reduction of the antenna responsible for the electromagnetic transceiver function cannot be achieved through these technologies. In addition, with the rapid development of radar and communication systems, there is an increasing demand for antennas with multiple integrated functions such as high gain, circular polarization, and beam controllability, thereby improving the detection or communication distance and signal quality. Therefore, there is an urgent need to explore solutions for the stealth of these high-performance multifunctional antennas.

[0003] The planar transmission array antenna is a high-gain air-fed antenna that combines the advantages of a planar microstrip array antenna and a lens antenna. As a high-gain air-fed array antenna, it combines array antenna theory and optical principles, and can achieve high-gain radiation through a relatively simple structure, which has attracted the attention of many scholars and experts. Compared with the planar reflector array antenna, the planar transmission array antenna does not have the problem of feed source shielding, because the feed source and beam radiation direction of the planar transmission array antenna are distributed on both sides of the array surface, which makes the transmission array antenna simpler and more flexible in design. At the same time, because there is no feed source shielding effect, in theory, compared with the reflector array antenna, higher aperture efficiency can be achieved, and the sidelobe level and cross-polarization level are lower, which can enable the transmission array antenna to be used in high-quality communication systems. Existing inventions have explored a variety of methods to reduce the RCS of the transmission array antenna. For example, a low RCS transmission array antenna is realized by using dielectric columns of different heights and bandpass frequency selective surfaces as phase shifters. In addition, asymmetric resonators with resistors are used to obtain absorption-transmission-absorption response, and beam convergence is achieved by rotating the open resonant ring to control the transmission phase. However, these low RCS transmission array antennas lack the ability to reduce RCS within the transmission band and have a low degree of integration. In actual use, they have problems such as weak adaptability and poor portability. Therefore, there is an urgent need to realize a transmission array antenna with high gain radiation, strong beam focusing capability, high integration, and low RCS characteristics within and outside the transmission band, so that it can adapt to different application scenarios and have the ability to face complex electromagnetic environments. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a highly integrated in-band and out-of-band low RCS transmission array antenna to solve the problem that traditional low RCS transmission array antennas lack beam focusing capability and have a low degree of integration, thereby improving the application breadth and depth of application of the antenna.

[0005] In order to achieve the above-mentioned purpose, the present application provides a highly integrated in-band and out-of-band low RCS transmission array antenna, the transmission array antenna comprising a feed and a transmission array, the transmission array comprising a plurality of radiating units and a dielectric substrate for supporting the radiating units; the radiating units comprising A-type radiating units and B-type radiating units; with the center of the dielectric substrate as the origin, two mutually orthogonal axes are used to divide the dielectric substrate into four quadrant areas of equal area; a plurality of A-type radiating units are periodically and evenly arranged in the second quadrant area and the fourth quadrant area, respectively, and a plurality of B-type radiating units are periodically and evenly arranged in the first quadrant area and the third quadrant area, respectively; wherein the second quadrant area and the fourth quadrant area are centrally symmetrical, and the first quadrant area and the third quadrant area are centrally symmetrical.

[0006] Furthermore, in an embodiment of the present application, the polarization mode of the feed source is linear polarization.

[0007] Furthermore, in an embodiment of the present application, the dielectric substrate includes a first dielectric substrate, a second dielectric substrate and a third dielectric substrate stacked in sequence; a first air layer exists between the first dielectric substrate and the second dielectric substrate, and a second air layer exists between the second dielectric substrate and the third dielectric substrate.

[0008] Furthermore, in the embodiment of the present application, any type A radiation unit includes a metal layer A1 attached to the top surface of the first dielectric substrate, a metal layer A2 attached to the top surface of the second dielectric substrate, a metal layer A3 attached to the bottom surface of the second dielectric substrate, and a metal layer A4 attached to the bottom surface of the third dielectric substrate; any type B radiation unit includes a metal layer B1 attached to the top surface of the first dielectric substrate, a metal layer B2 attached to the top surface of the second dielectric substrate, a metal layer B3 attached to the bottom surface of the second dielectric substrate, and a metal layer B4 attached to the bottom surface of the third dielectric substrate; the metal layers A1~A4 are arranged in sequence, and the metal layers B1~B4 are arranged in sequence.

[0009] Furthermore, in the embodiment of the present application, the metal layer A1 includes a primary cross-shaped patch a11 and four rectangular combination patches C1, the four rectangular combination patches C1 are respectively located at the upper left, lower left, upper right and lower right positions of the primary cross-shaped patch a11, and the four rectangular combination patches C1 are at the same distance from the primary cross-shaped patch a11; any rectangular combination patch C1 is composed of four right-angle patches a12 coinciding with the four right angles of the rectangle and a secondary cross-shaped patch a13 located at the center of the rectangle, wherein the four right-angle patches a12 and the secondary cross-shaped patch a13 are not connected to each other; the metal layer B1 includes a primary cross-shaped patch b11 and four rectangular combination patches C2, The four rectangular combination stickers C2 are respectively located at the upper left, lower left, upper right and lower right positions of the first-level cross-shaped sticker b11, and the four rectangular combination stickers C2 are at the same distance from the first-level cross-shaped sticker; any rectangular combination sticker C2 is composed of four right-angle stickers b12 coincident with the four right angles of the rectangle and a second-level cross-shaped sticker b13 located at the center of the rectangle, wherein the four right-angle stickers b12 and the second-level cross-shaped sticker b13 are not connected to each other; wherein, there is a size difference between the first-level cross-shaped sticker a11 and the first-level cross-shaped sticker b11; there is a size difference between the right-angle sticker a12 and the right-angle sticker b12; there is a size difference between the second-level cross-shaped sticker a13 and the second-level cross-shaped sticker b13.

[0010] Furthermore, in the embodiment of the present application, the metal layer A2 includes four V-groove metal stickers a21; the openings of the four V-groove metal stickers a21 are oriented in the same direction; the four secondary cross-shaped stickers a13 of the metal layer A1 are mapped into four cross-shaped Y3 on the top surface of the second dielectric substrate, and the vertices of the four V-groove metal stickers a21 coincide with the centers of the four cross-shaped Y3; the metal layer A3 includes four V-groove metal stickers a31; the vertices of the four V-groove metal stickers a31 coincide with the vertices of the four V-groove metal stickers a21; wherein the opening direction of the V-groove metal sticker a31 differs by 90° from the opening direction of the V-groove metal sticker a21. The metal layer B2 has the same structure as the metal layer A2; the metal layer B3 has the same structure as the metal layer A3.

[0011] Furthermore, in an embodiment of the present application, when the opening direction of the V-groove metal sticker a31 differs from the opening direction of the V-groove metal sticker a21 by +90°, the transmission array antenna operates in a first transmission state; when the opening direction of the V-groove metal sticker a31 differs from the opening direction of the V-groove metal sticker a21 by -90°, the transmission array antenna operates in a second transmission state.

[0012] Furthermore, in the embodiment of the present application, the metal layer A4 includes four secondary cross-shaped stickers a41, and the four secondary cross-shaped stickers a41 respectively coincide with the mapping of the four secondary cross-shaped stickers a13 on the bottom surface of the third dielectric substrate; the metal layer B4 includes four secondary cross-shaped stickers b41, and the four secondary cross-shaped stickers b41 respectively coincide with the mapping of the four secondary cross-shaped stickers b13 on the bottom surface of the third dielectric substrate.

[0013] Furthermore, in the embodiment of the present application, the transmission frequency band of the transmission array antenna is 12~14GHz.

[0014] Furthermore, in the embodiment of the present application, the reflection phase difference between the A-type radiation unit and the B-type radiation unit is maintained within the range of 180°±37°.

[0015] The highly integrated in-band and out-of-band low RCS transmission array antenna provided by the present application has at least the following beneficial effects: (1) By constructing a multi-mode resonant structure and efficiently utilizing each resonant mode to achieve different functions, the convergence of the in-band radiation beam, the effective reduction of the in-band radar scattering cross-section, and the effective reduction of the out-of-band radar scattering cross-section can be achieved simultaneously, thereby improving the antenna's electromagnetic transceiver capability and electromagnetic stealth capability; (2) The antenna has a simple structure, high integration, and low cost, which is conducive to large-scale applications.

[0016] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the accompanying drawings: Figure 1 A front view of a transmission array antenna is schematically shown; Figure 2 The three-dimensional structure diagram of the transmission array antenna is schematically shown; Figure 3 The three-dimensional structure diagram of the A-type radiation unit is schematically shown; Figure 4 The schematic diagram shows the structure of the metal layer A4 of the A-type radiation unit on the third dielectric substrate; Figure 5 The three-dimensional structure diagram of the B-type radiation unit is schematically shown; Figure 6 The schematic diagram of the layout of the first metal layer of the transmission array antenna is shown schematically; Figure 7A schematic diagram showing the layout of the second metal layer of the transmission array antenna is shown; Figure 8 The schematic diagram of the layout of the third metal layer of the transmission array antenna is schematically shown; Fig. 9 The schematic diagram of the layout of the fourth metal layer of the transmission array antenna is schematically shown; Fig.10 The schematic diagram shows the structure of the second metal layer and the third metal layer in the first transmission state (Bit0); Fig.11 The schematic diagram shows the structure of the second metal layer and the third metal layer in the second transmission state (Bit1); Fig.12 Schematically showing a transmission phase curve diagram of the second metal layer and the third metal layer of the transmission array antenna in a first transmission state (Bit0) and a second transmission state (Bit1); Fig.13 Schematically showing the in-band transmission amplitude curves of the A-type radiation unit (unit A) and the B-type radiation unit (unit B); Fig.14 Schematically showing the in-band reflection phase curve diagram of the A-type radiation unit (unit A) and the B-type radiation unit (unit B); Fig.15 Schematically showing the out-of-band low-frequency reflection phase curve diagram of the A-type radiating unit (unit A) and the B-type radiating unit (unit B); Fig.16 Schematically showing out-of-band high frequency reflection phase curves of an A-type radiating unit (unit A) and a B-type radiating unit (unit B); Fig.17 The in-band gain curve diagram of the transmission array antenna is schematically shown; Fig.18 The figure schematically shows the x-polarization RCS reduction performance curve of the transmission array antenna in-band and out-band.

[0018] Description of Reference Numerals 1-feed source; 2-transmission array; 3-first dielectric substrate; 4-second dielectric substrate; 5-third dielectric substrate; 6-first metal layer; 7-second metal layer; 8-third metal layer; 9-fourth metal layer. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0020] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application. Example

[0022] like Figure 1 and Figure 2 As shown, this embodiment provides a highly integrated in-band and out-of-band low RCS transmission array antenna, which includes a feed 1 and a transmission array 2. Among them, the feed 1 can be a key component in a radio telescope, a satellite communication system or other wireless communication equipment, and its main function is to receive the electromagnetic wave signal from a distance and convert it into a processable electrical signal, or conversely, to convert the electrical signal into an electromagnetic wave and transmit it in the transmission mode. Its structure is usually a simple horn antenna or a more complex multi-mode feed 1 device. The operating frequency band of the feed 1 needs to cover the operating frequency band of the transmission array 2.

[0023] The transmission array 2 is a plane or curved structure composed of multiple antenna units (a plane structure is taken as an example in this embodiment), and these units are usually arranged according to a certain rule. Each antenna unit can independently emit electromagnetic waves, and the direction and shape of the beam emitted by the entire array can be controlled by adjusting the phase and amplitude of each unit, so the function of beam convergence can also be realized. In this embodiment, the feed source 1 is arranged at a preset position away from the array surface of the transmission array 2, and is used to provide electromagnetic waves to the array surface. Specifically, in this embodiment, the transmission array 2 includes a plurality of radiation units and a dielectric substrate for supporting the radiation units; the radiation units include A-type radiation units and B-type radiation units; the center of the dielectric substrate is taken as the origin, and two mutually orthogonal axes (such as a Cartesian coordinate system) are used to divide the dielectric substrate into four quadrants of equal area; a plurality of A-type radiation units (a total of M A-type radiation units, where M≥2) are periodically and evenly arranged in the second quadrant area and the fourth quadrant area, respectively, and a plurality of B-type radiation units (a total of N B-type radiation units, where N≥2) are periodically and evenly arranged in the first quadrant area and the third quadrant area, respectively. Figure 2 and Figure 6 As shown; wherein, the second quadrant area and the fourth quadrant area are centrally symmetrical, and the first quadrant area and the third quadrant area are centrally symmetrical.

[0024] Specifically, the dielectric substrate includes a first dielectric substrate 3, a second dielectric substrate 4, and a third dielectric substrate 5 which are stacked in sequence. The three dielectric substrates have the same size and can be completely overlapped. However, the first, second, and third dielectric substrates 5 are not completely tightly fitted together. There is a first air layer between the first dielectric substrate 3 and the second dielectric substrate 4, and there is a second air layer between the second dielectric substrate 4 and the third dielectric substrate 5.

[0025] Any A-type radiation unit includes a metal layer A1 attached to the top surface of the first dielectric substrate 3, a metal layer A2 attached to the top surface of the second dielectric substrate 4, a metal layer A3 attached to the bottom surface of the second dielectric substrate 4, and a metal layer A4 attached to the bottom surface of the third dielectric substrate 5; any B-type radiation unit includes a metal layer B1 attached to the top surface of the first dielectric substrate 3, a metal layer B2 attached to the top surface of the second dielectric substrate 4, a metal layer B3 attached to the bottom surface of the second dielectric substrate 4, and a metal layer B4 attached to the bottom surface of the third dielectric substrate 5; the metal layers A1~A4 are arranged in sequence, and the metal layers B1~B4 are arranged in sequence. In this embodiment, since the metal layers A1 of all A-type radiation units and the metal layers B1 of all B-type radiation units are attached to the same surface of the same dielectric substrate, for the convenience of understanding, the metal layer structure composed of all metal layers A1 and all metal layers B1 is named the first metal layer 6. For details, please refer to Figure 1 and Figure 6As shown above, the metal layer structure composed of all metal layers A2 and all metal layers B2 is named the second metal layer 7, and the specific reference is Figure 1 and Figure 7 As shown above, the metal layer structure composed of all metal layers A3 and all metal layers B3 is named the third metal layer 8, which can be specifically referred to Figure 1 and Figure 8 As shown above, the metal layer structure composed of all metal layers A4 and all metal layers B4 is named the fourth metal layer 9, which can be specifically referred to Figure 1 and Fig. 9 shown. Example

[0026] This embodiment further describes the structures of the A-type radiation unit and the B-type radiation unit in Embodiment 1. Figure 3 As shown, the metal layer A1 includes a primary cross-shaped sticker a11 and four rectangular combination stickers C1, wherein the four rectangular combination stickers C1 are respectively located at the upper left, lower left, upper right and lower right positions of the primary cross-shaped sticker a11, and the four rectangular combination stickers C1 are at the same distance from the primary cross-shaped sticker a11; any rectangular combination sticker C1 is composed of four right-angle stickers a12 coinciding with the four right angles of the rectangle and a secondary cross-shaped sticker a13 located at the center of the rectangle, wherein the four right-angle stickers a12 and the secondary cross-shaped sticker a13 are not connected to each other; Figure 5 As shown, the metal layer B1 includes a first-level cross-shaped patch b11 and four rectangular combination patches C2, and the four rectangular combination patches C2 are respectively located at the upper left, lower left, upper right and lower right positions of the first-level cross-shaped patch b11, and the four rectangular combination patches C2 are at the same distance from the first-level cross-shaped patch; any rectangular combination patch C2 is composed of four right-angle patches b12 coincident with the four right angles of the rectangle and a second-level cross-shaped patch b13 located at the center of the rectangle, wherein the four right-angle patches b12 and the second-level cross-shaped patch b13 are not connected to each other; wherein, there is a size difference between the first-level cross-shaped patch a11 and the first-level cross-shaped patch b11; there is a size difference between the right-angle patch a12 and the right-angle patch b12; there is a size difference between the second-level cross-shaped patch a13 and the second-level cross-shaped patch b13.

[0027] The metal layer A2 includes four V-grooved metal stickers a21; the opening directions of the four V-grooved metal stickers a21 are the same; the four secondary cross-shaped stickers a13 of the metal layer A1 are mapped into four cross-shaped Y3 on the top surface of the second dielectric substrate 4, and the vertices of the four V-grooved metal stickers a21 coincide with the centers of the four cross-shaped Y3 respectively; the metal layer A3 includes four V-grooved metal stickers a31; the vertices of the four V-grooved metal stickers a31 coincide with the vertices of the four V-grooved metal stickers a21 respectively; wherein the opening direction of the V-grooved metal sticker a31 differs from the opening direction of the V-grooved metal sticker a21 by 90° (the opening directions of the four V-grooved metal stickers a31 may be consistent or inconsistent, but the opening direction of any V-grooved metal sticker a31 differs from the opening direction of the V-grooved metal sticker a21 by +90° or -90°). The metal layer B2 has the same structure as the metal layer A2; the metal layer B3 has the same structure as the metal layer A3.

[0028] like Fig.10 As shown, when the opening direction of the V-groove metal patch a31 differs from the opening direction of the V-groove metal patch a21 by +90°, the transmission array antenna operates in the first transmission state; Fig.11 As shown, when the opening direction of the V-groove metal patch a31 differs from the opening direction of the V-groove metal patch a21 by -90°, the transmission array antenna works in the second transmission state. The transmission amplitudes of the first transmission state and the second transmission state are similar, and the transmission phase difference is 180°. Fig.12 is the transmission phase of the transmission array antenna in the first transmission state (Bit0) and the second transmission state (Bit1). The transmission phase difference between the transmission state Bit0 and the transmission state Bit1 in the band can be stably maintained at 180°, indicating that the second metal layer 7 and the third metal layer 8 are arranged in a specific manner in the transmission state Bit0 and the transmission state Bit1 to achieve the transmission beam focusing function in the band. Further, as Fig.13 As shown, the transmission frequency band of type A radiation unit (unit A in the figure) is wider than that of type B radiation unit (unit B in the figure). The entire transmission array antenna is composed of type A radiation unit and type B radiation unit. Therefore, the transmission frequency band of the entire transmission array antenna is 12~14GHz, and the transmission amplitude within the band performs well, indicating that the highly integrated in-band and out-of-band low radar scattering cross-section transmission array antenna has good in-band transmission performance.

[0029] Further, in the embodiment of the present application, the metal layer A4 includes four secondary cross-shaped stickers a41 (such as Figure 4As shown), the four secondary cross-shaped stickers a41 overlap with the mapping of the four secondary cross-shaped stickers a13 on the bottom surface of the third dielectric substrate 5; the metal layer B4 includes four secondary cross-shaped stickers b41, and the four secondary cross-shaped stickers b41 overlap with the mapping of the four secondary cross-shaped stickers b13 on the bottom surface of the third dielectric substrate 5; for details, please refer to Fig. 9 .like Fig.14 , Fig.15 and Fig.16 As shown, due to the different sizes of the secondary cross-shaped patch a13 and the secondary cross-shaped patch b13, the different sizes of the primary cross-shaped patch a11 and the primary cross-shaped patch b11, and the different sizes of the right-angle patch a12 and the right-angle patch b12, the reflection phase differences of the A-type radiating unit and the B-type radiating unit in the in-band (12~14GHz), out-of-band low frequency (8~10.5GHz) and out-of-band high frequency (15~17.7GHz) can be maintained within the range of 180°±37°. Example

[0030] Exemplarily, this embodiment is based on Embodiments 1 and 2, by combining M=32 A-type radiation units and N=32 B-type radiation units, the combination method is as follows: Figures 6-8 As shown, the upper left and lower right are 4×4 A-type radiating units, the upper right and lower left are 4×4 B-type radiating units, and the feed source 1 is placed directly behind the array for simulation verification.

[0031] Depend on Fig.17 It can be seen that the highly integrated in-band and out-of-band low radar cross-sectional area transmission array antenna constructed in the embodiment of the present invention can realize the beam focusing function within 12~14GHz.

[0032] Furthermore, if Fig.18 As shown, this embodiment is based on the traditional phased array antenna beam control theory. By changing the in-band and out-of-band reflection phase of each unit, the incident electromagnetic wave is diffusely reflected to different directions, thereby achieving an x-polarization RCS reduction of more than 5 dB within the in-band 12.5-14 GHz and an x-polarization RCS reduction of more than 10 dB within the out-of-band 8-10.5 GHz and 15-17.7 GHz, verifying the electromagnetic stealth capability of the highly integrated, low radar scattering cross-section reconfigurable circularly polarized transmission array antenna.

[0033] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0034] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A highly integrated in-band and out-of-band low RCS transmission array antenna, the transmission array antenna comprising a feed source and a transmission array, characterized in that: The transmission array includes a plurality of radiation units and a dielectric substrate for supporting the radiation units; the radiation units include type A radiation units and type B radiation units; The center of the dielectric substrate is taken as the origin, and two mutually orthogonal axes are used to divide the dielectric substrate into four quadrants with equal areas; a plurality of A-type radiation units are periodically and evenly arranged in the second quadrant and the fourth quadrant, and a plurality of B-type radiation units are periodically and evenly arranged in the first quadrant and the third quadrant; the second quadrant and the fourth quadrant are centrally symmetrical, and the first quadrant and the third quadrant are centrally symmetrical.

2. The highly integrated in-band and out-of-band low RCS transmission array antenna according to claim 1, characterized in that: The dielectric substrate comprises a first dielectric substrate, a second dielectric substrate and a third dielectric substrate which are stacked in sequence; a first air layer is provided between the first dielectric substrate and the second dielectric substrate, and a second air layer is provided between the second dielectric substrate and the third dielectric substrate.

3. The highly integrated in-band and out-of-band low RCS transmission array antenna according to claim 2, characterized in that: Any A-type radiation unit includes a metal layer A1 attached to the top surface of the first dielectric substrate, a metal layer A2 attached to the top surface of the second dielectric substrate, a metal layer A3 attached to the bottom surface of the second dielectric substrate, and a metal layer A4 attached to the bottom surface of the third dielectric substrate; any B-type radiation unit includes a metal layer B1 attached to the top surface of the first dielectric substrate, a metal layer B2 attached to the top surface of the second dielectric substrate, a metal layer B3 attached to the bottom surface of the second dielectric substrate, and a metal layer B4 attached to the bottom surface of the third dielectric substrate; the metal layers A1~A4 are arranged in sequence, and the metal layers B1~B4 are arranged in sequence.

4. The highly integrated in-band and out-of-band low RCS transmission array antenna according to claim 3, characterized in that: The metal layer A1 includes a primary cross-shaped sticker a11 and four rectangular combination stickers C1, the four rectangular combination stickers C1 are respectively located at the upper left, lower left, upper right and lower right positions of the primary cross-shaped sticker a11, and the four rectangular combination stickers C1 are at the same distance from the primary cross-shaped sticker a11; any rectangular combination sticker C1 is composed of four right-angle stickers a12 coinciding with the four right angles of the rectangle and a secondary cross-shaped sticker a13 located at the center of the rectangle, wherein the four right-angle stickers a12 and the secondary cross-shaped sticker a13 are not connected to each other; The metal layer B1 includes a primary cross-shaped sticker b11 and four rectangular combination stickers C2, the four rectangular combination stickers C2 are respectively located at the upper left, lower left, upper right and lower right positions of the primary cross-shaped sticker b11, and the four rectangular combination stickers C2 are at the same distance from the primary cross-shaped sticker; any rectangular combination sticker C2 is composed of four right-angle stickers b12 coinciding with the four right angles of the rectangle and a secondary cross-shaped sticker b13 located at the center of the rectangle, wherein the four right-angle stickers b12 and the secondary cross-shaped sticker b13 are not connected to each other; Among them, there is a size difference between the first-level cross-shaped sticker a11 and the first-level cross-shaped sticker b11; there is a size difference between the right-angle sticker a12 and the right-angle sticker b12; there is a size difference between the second-level cross-shaped sticker a13 and the second-level cross-shaped sticker b13.

5. The highly integrated in-band and out-of-band low RCS transmission array antenna according to claim 4, characterized in that: The metal layer A2 includes four V-groove metal stickers a21; the openings of the four V-groove metal stickers a21 face the same direction; the four secondary cross-shaped stickers a13 of the metal layer A1 are mapped to four cross-shaped stickers Y3 on the top surface of the second dielectric substrate, and the vertices of the four V-groove metal stickers a21 coincide with the centers of the four cross-shaped stickers Y3 respectively; The metal layer A3 includes four V-groove metal stickers a31; the vertices of the four V-groove metal stickers a31 are mapped and overlapped with the vertices of the four V-groove metal stickers a21; The opening direction of the V-groove metal sticker a31 is 90° different from the opening direction of the V-groove metal sticker a21; The metal layer B2 has the same structure as the metal layer A2; the metal layer B3 has the same structure as the metal layer A3.

6. The highly integrated in-band and out-of-band low RCS transmission array antenna according to claim 5, characterized in that: When the opening direction of the V-groove metal patch a31 differs from the opening direction of the V-groove metal patch a21 by +90°, the transmission array antenna operates in the first transmission state; when the opening direction of the V-groove metal patch a31 differs from the opening direction of the V-groove metal patch a21 by -90°, the transmission array antenna operates in the second transmission state.

7. The highly integrated in-band and out-of-band low RCS transmission array antenna according to claim 4, characterized in that: The metal layer A4 includes four secondary cross-shaped stickers a41, and the four secondary cross-shaped stickers a41 respectively overlap with the mapping of the four secondary cross-shaped stickers a13 on the bottom surface of the third dielectric substrate; The metal layer B4 includes four secondary cross-shaped stickers b41, and the four secondary cross-shaped stickers b41 are respectively overlapped with the mapping of the four secondary cross-shaped stickers b13 on the bottom surface of the third dielectric substrate.

8. The highly integrated in-band and out-of-band low RCS transmission array antenna according to any one of claims 1 to 7, characterized in that: The polarization mode of the feed source is linear polarization.

9. The highly integrated in-band and out-of-band low RCS transmission array antenna according to any one of claims 1 to 7, characterized in that: The transmission array antenna has a transmission frequency band of 12 to 14 GHz.

10. The highly integrated in-band and out-of-band low RCS transmission array antenna according to any one of claims 1 to 7, characterized in that: The reflection phase difference between the A-type radiation unit and the B-type radiation unit is maintained within the range of 180°±37°.

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