Dual-band conformal co-boresight composite antenna

Abstract

The application discloses a dual-band conformal co-boresight composite antenna, comprising: an S-band circularly polarized phased array antenna and an X-band waveguide feed medium antenna arranged on a metal bottom plate, and the metal bottom plate is attached and installed on an aircraft cabin body; the S-band circularly polarized phased array antenna comprises: a first layer of dielectric substrate, a second layer of dielectric substrate and a third layer of dielectric substrate arranged in sequence from top to bottom, and the third layer of dielectric substrate is arranged above the metal bottom plate; a plurality of microstrip patches are installed on the upper surface of the first layer of dielectric substrate; a feed network is installed on the lower surface of the second layer of dielectric substrate and comprises a plurality of power dividers corresponding to the plurality of microstrip patches; the metal bottom plate is provided with a plurality of feed SSMA connectors corresponding to the plurality of power dividers; the power dividers comprise an input end and two output ends; the feed SSMA connectors are electrically connected with the metal bottom plate and the input end of the power dividers, and the output ends of the power dividers are electrically connected with the corresponding microstrip patches; and the application improves the aerodynamic performance of the aircraft.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and in particular to a dual-band conformal co-aperture composite antenna. Background Technology

[0002] With the rapid development of wireless communication, radar detection, and aerospace technology, antennas, as the core component of aircraft electronic systems, directly affect the communication quality and detection capabilities of aircraft.

[0003] Conventional antennas are typically mounted protruding from the surface of an aircraft, which can easily affect the aerodynamic performance of high-speed aircraft. They also generate additional aerodynamic drag, increasing the aircraft's energy consumption. Furthermore, the installation process of antennas can easily alter the load path, thereby reducing the overall structural efficiency of the aircraft, increasing radio frequency path loss, and creating structural defects.

[0004] Conformal antennas integrate the antenna with the airframe structure, serving as both a functional and structural element, thus achieving a fusion of function and structure. Conformal antennas not only significantly reduce their adverse effects on aircraft aerodynamic performance but also effectively lower the aircraft's RCS (radar cross section). Furthermore, because conformal antennas maximize the use of the carrier surface, they can achieve a larger aperture than conventional antennas. Compared to traditional antennas mounted on the aircraft surface, conformal antennas, while maintaining the original structural performance, offer advantages such as flexible placement and reduced electromagnetic compatibility issues, significantly contributing to improved structural utilization efficiency and antenna performance. Due to these outstanding advantages and potential application prospects, conformal antennas are considered one of the main forms of antennas for the future.

[0005] With the rapid development of wireless communication and radar, the demand for conformal high-gain dual / multi-band composite antennas is becoming increasingly urgent. Antenna development in miniaturization, broadband, multi-band, and integration is receiving increasing attention, but also faces numerous challenges. Due to platform space limitations, multiple antennas need to be placed together to operate. Furthermore, the increasing comprehensiveness and complexity of communication equipment inevitably leads to a complex electromagnetic environment on the platform, placing significant pressure on the normal operation of the antennas and even the entire communication system.

[0006] Therefore, designing an integrated antenna with good characteristics that can operate in dual / multi-band is an urgent problem to be solved.

[0007] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art. Summary of the Invention

[0008] The purpose of this invention is to provide a dual-band conformal co-aperture composite antenna to solve the technical problems in the prior art, such as poor aerodynamic performance of the aircraft, limited space resources on the aircraft cabin surface, and low radiation efficiency caused by separating the S-band antenna and the X-band antenna and installing them separately and protrudingly on the outer surface of the aircraft.

[0009] To achieve the above objectives, the present invention provides a dual-band conformal aperture composite antenna, installed inside an aircraft cabin, comprising: An S-band circularly polarized phased array antenna and an X-band waveguide-fed dielectric antenna are mounted on a metal base plate, wherein the metal base plate is conformally fitted to the inner wall of the aircraft cabin. The S-band circularly polarized phased array antenna includes: A first dielectric substrate, a second dielectric substrate, and a third dielectric substrate are stacked sequentially from top to bottom, with the third dielectric substrate disposed on the metal base plate; Multiple microstrip patches are mounted on the upper surface of the first dielectric substrate; A power supply network is mounted on the lower surface of the second dielectric substrate; the power supply network includes multiple power dividers, which respectively supply power to multiple microstrip patches; The metal base plate is provided with multiple feed SSMA (miniaturized radio frequency coaxial electrical connector) connectors, each corresponding to a multiple power divider; the power divider includes an input terminal and two output terminals; the outer conductor of the feed SSMA connector is electrically connected to the metal base plate, the input terminal of the power divider is electrically connected to the inner conductor of the corresponding feed SSMA connector, and the output terminal of the power divider is electrically connected to the corresponding microstrip patch.

[0010] Optionally, the X-band waveguide-fed dielectric antenna includes: a dielectric block, a feed SMA connector, a short-circuit block, a metal pressure block, and a waveguide cavity formed in the metal base plate; The dielectric block is disposed within the waveguide cavity, and the dielectric block is excited through the waveguide cavity; the dielectric block includes a first part and a second part that are connected to each other; along the direction away from the first part, the cross-sectional area of ​​the second part gradually decreases; The power supply SMA connector passes through the first part and is electrically connected to the first part; The short-circuit block is disposed in the waveguide cavity and is used to seal the waveguide cavity and adjust the impedance matching of the X-band waveguide-fed dielectric antenna. The metal pressure block is pressed onto the first part, and fasteners are sequentially inserted through the metal pressure block and the metal base plate to fix the dielectric block inside the waveguide cavity.

[0011] Optionally, the second part includes a first end and a second end opposite to each other, with the first end of the second part connected to the first part; Let L represent the distance between the first end face of the second part and the second end face of the second part, and k represent the electromagnetic wave number in vacuum. z This indicates the electromagnetic wave number in the X-band waveguide-fed dielectric antenna. ; Let S max S represents the area of ​​the first end face of the second part. min This represents the area of ​​the second end face of the second part. This represents the dielectric constant of the dielectric block. Indicates the wavelength in free space; ; .

[0012] Optionally, the number of microstrip patches is four, arranged in a 2×2 array; The number of power dividers is four; in the clockwise direction, the output signals of the four power dividers have the same amplitude and their phases differ by 90° sequentially.

[0013] Optionally, the microstrip patch has a rectangular structure, and the spacing between adjacent microstrip patches is denoted as d, satisfying: ; in, For wavelength, The main beam angle.

[0014] Optionally, the first dielectric substrate has multiple sets of metallized vias, each corresponding to a position of one of the multiple microstrip patches; Each group of metallized vias includes two metallized vias, and the two output terminals of the power divider are electrically connected to the corresponding microstrip patch through the corresponding two metallized vias.

[0015] Optionally, the power divider is a stripline structure, and impedance matching of the power divider is achieved by adjusting the stripline width between the input and output terminals of the power divider.

[0016] Optionally, the dual-band conformal aperture composite antenna further includes: an antenna radome and a metal retaining ring; The radome is mounted on the S-band circularly polarized phased array antenna; the outer periphery of the radome is provided with a flange; The metal pressure ring is pressed onto the flange, and the antenna cover is fixedly installed on the metal base plate by fasteners sequentially passing through the metal pressure ring and the metal base plate.

[0017] Optionally, the upper surface of the second dielectric substrate and the lower surface of the third dielectric substrate are both provided with a metal cladding.

[0018] Optionally, the first dielectric substrate and the second dielectric substrate, as well as the second dielectric substrate and the third dielectric substrate, are bonded together by prepreg.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: The dual-band conformal aperture composite antenna of the present invention is attached to the aircraft cabin (conformal with the aircraft cabin), which significantly reduces flight drag and radar cross section, and greatly reduces the adverse effects on the aerodynamic performance of the aircraft.

[0020] The S-band circularly polarized phased array antenna and the X-band waveguide-fed dielectric antenna of this invention adopt the same aperture design, which achieves high integration, simple structure, and greatly reduces the space occupied in the aircraft cabin.

[0021] Because the overall size of this invention is greatly reduced, it significantly reduces structural weight and simplifies sealing design, thereby greatly minimizing the negative impact on the structural strength and thermal protection system of the aircraft. Furthermore, this invention also features a wide operating frequency band and low cost. Attached Figure Description

[0022] Figure 1 This is a top view of a dual-band conformal co-aperture composite antenna in an embodiment of the present invention.

[0023] Figure 2 This is an exploded view of a dual-band conformal co-aperture composite antenna in an embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram of the power supply network in an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of an X-band waveguide-fed dielectric antenna and multiple sets of metallized vias formed on the first dielectric substrate, as described in an embodiment of the present invention. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, used only to facilitate and clearly illustrate the embodiments of the present invention. Please refer to the drawings to make the objectives, features, and advantages of the present invention more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of the present invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the present invention, should still fall within the scope of the technical content disclosed in the present invention.

[0027] Figure 1 This is a top view of the dual-band conformal aperture composite antenna in an embodiment of the present invention, which is installed inside the aircraft cabin and includes: The system comprises a metal base plate 4, an S-band circularly polarized phased array antenna 1, and an X-band waveguide-fed dielectric antenna 3 mounted on the metal base plate 4. The metal base plate 4 is fitted and installed against the inner wall of the aircraft cabin. Traditionally, the S-band and X-band antennas are separately mounted on the outer periphery of the aircraft and protrude from the aircraft surface, severely impacting the aircraft's aerodynamic performance. The dual-band conformal aperture composite antenna of this invention is attached to the aircraft cabin (conformal to the aircraft cabin structure), significantly reducing flight drag and radar cross-section, and greatly minimizing its adverse effects on the aircraft's aerodynamic performance.

[0028] In this invention, the S-band circularly polarized phased array antenna 1 and the X-band waveguide-fed dielectric antenna 3 adopt the same aperture design, which achieves high integration, simple structure, and greatly reduces the space occupied in the aircraft cabin.

[0029] like Figure 2 As shown, the S-band circularly polarized phased array antenna 1 includes: a first dielectric substrate 13, a second dielectric substrate 15, a third dielectric substrate 17, multiple microstrip patches 130, and a feed network.

[0030] like Figure 2 As shown, the first dielectric substrate 13, the second dielectric substrate 15, the third dielectric substrate 17, and the metal base plate 4 are stacked sequentially from top to bottom.

[0031] The thickness of the dielectric substrate is determined by the bandwidth of the S-band circularly polarized phased array antenna 1. In a preferred embodiment, the first dielectric substrate 13 can be made of a substrate with a dielectric constant of 2.94 and a thickness of 3.81 mm. The second dielectric substrate 15 and the third dielectric substrate 17 can be made of a substrate with a dielectric constant of 3.5 and a thickness of 0.508 mm.

[0032] like Figure 2 , Figure 4 As shown, multiple microstrip patches 130 are mounted on the upper surface of the first dielectric substrate 13. In this embodiment, the microstrip patches 130 have a rectangular structure, and there are four microstrip patches 130 arranged in a 2×2 array. The size of the microstrip patches 130 can be determined according to the operating frequency of the S-band circularly polarized phased array antenna 1.

[0033] To avoid excessive spacing between microstrip patches 130, which could lead to grating lobes at large beam tilt angles, the spacing d between adjacent microstrip patches 130 should satisfy formula (1): (1) In formula (1), For wavelength, The main beam angle.

[0034] Because the microstrip patch 130 is affected by adjacent microstrip patches 130, the current of the microstrip patch 130 increases with the decrease of the spacing d, resulting in a stronger mutual coupling effect, which affects the performance of the S-band circularly polarized phased array antenna 1. In a preferred embodiment, the spacing d between adjacent microstrip patches 130 is 55 mm.

[0035] like Figure 4 As shown, in this embodiment, the first dielectric substrate 13 has four sets of metallized vias 131 (through holes with metal plated on their inner walls), corresponding to the positions of the four microstrip patches 130. Each set has two metallized vias 131. The function of the metallized vias 131 will be described in detail later.

[0036] like Figure 2 As shown, the upper surface of the second dielectric substrate 15 is provided with a metal cladding layer 155, and the lower surface of the third dielectric substrate 17 is provided with a metal cladding layer 171. In a preferred embodiment, the thickness of the metal cladding layers 155 and 171 is 0.018 mm.

[0037] In this embodiment, the first dielectric substrate 13 and the second dielectric substrate 15 are bonded together by a prepreg 14, and the second dielectric substrate 15 and the third dielectric substrate 17 are bonded together by a prepreg 16. The dielectric constant and thickness of the prepregs 14 and 16 affect the size and bandwidth of the S-band circularly polarized phased array antenna 1, respectively. In a preferred embodiment, the prepregs 14 and 16 can be made of materials with a dielectric constant of 2.81 and a thickness of 0.1 mm.

[0038] like Figure 2As shown, a feed network is mounted on the lower surface of the second dielectric substrate for feeding multiple microstrip patches 130. By laminating the microstrip patches 130, the first dielectric substrate 13, the prepreg 14, the metal cladding 155, the second dielectric substrate 15, the feed network, the prepreg 16, the third dielectric substrate 17, and the metal cladding 171, a compact laminated structure is formed. This laminated structure is fixedly mounted on the metal base plate 4, making the S-band circularly polarized phased array antenna 1 of the present invention smaller in size than conventional S-band antennas.

[0039] like Figure 2 , Figure 3 As shown, the feeding network includes multiple power dividers 150, which feed multiple microstrip patches 130 respectively. Each power divider 150 is located directly below its corresponding microstrip patch 130, making the S-band circularly polarized phased array antenna 1 more compact and easier to use. The power divider 150 can be a Wilkinson power divider, which is not limited in this invention.

[0040] In this embodiment, the number of power dividers 150 is four. For example... Figure 2 As shown, the metal base plate 4 is also fixedly equipped with four power supply SSMA connectors 151, which respectively supply power to the four power dividers 150. Figure 3 As shown, the power divider 150 includes an input terminal 1501 and two output terminals 1502. The outer conductor of the power-feeding SSMA connector 151 is electrically connected to the metal base plate 4. The input terminal 1501 of the power divider 150 is electrically connected to the inner conductor of the corresponding power-feeding SSMA connector 151. The two output terminals 1502 of the power divider 150 are electrically fed to the corresponding microstrip patch 130 through two corresponding metallized vias 131 on the first dielectric substrate 13 (the power divider 150 has dual feed points), thereby forming good circular polarization performance.

[0041] like Figure 3 As shown, the four power dividers 150 rotate 90° in a clockwise direction to ensure that the output signal amplitudes of the four power dividers 150 are the same and the phases are 90° apart, thereby improving the axial ratio performance of the S-band circularly polarized phased array antenna 1.

[0042] In this embodiment, the power divider 150 has a stripline structure. Impedance matching of the power divider 150 is achieved by adjusting the stripline width between its input terminal 1501 and output terminal 1502. In a preferred embodiment, both the input impedance and output impedance of the power divider 150 are 50 ohms.

[0043] The S-band circularly polarized phased array antenna 1 of the present invention has further improvements over the conventional S-band antenna in terms of operating bandwidth, circular polarization bandwidth, and especially beam coverage.

[0044] In this embodiment, as Figure 2 As shown, the dual-band conformal co-aperture composite antenna also includes: an radome 12 and a metal retaining ring 11. The radome 12 is mounted on the S-band circularly polarized phased array antenna 1 and is used to provide thermal protection for the S-band circularly polarized phased array antenna 1. The outer periphery of the radome 12 is provided with a flange, and the metal retaining ring 11 is pressed onto the flange. The radome 12 is fixedly mounted on the metal base plate 4 by fasteners (not shown in the figure) sequentially passing through the metal retaining ring 11 and the metal base plate 4.

[0045] like Figure 2 , Figure 4 As shown, the X-band waveguide-fed dielectric antenna 3 includes: a dielectric block 32, a feed SMA connector 34, a short-circuit block 33, a metal pressure block 31, and a waveguide cavity 35 formed on a metal base plate 4.

[0046] The dielectric block 32 is disposed within the waveguide cavity 35, and the dielectric block 32 is excited through the waveguide cavity 35. The dielectric block 32 includes a first part 321 and a second part 322 that are connected to each other.

[0047] A short-circuit block 33 is disposed within the waveguide cavity 35 to seal the waveguide cavity 35. The impedance matching of the X-band waveguide-fed dielectric antenna 3 can be adjusted by adjusting the length of the short-circuit block 33. A metal clamping block 31 is pressed onto the first part 321, and fasteners (not shown in the figure) are sequentially inserted through the metal clamping block 31 and the metal base plate 4 to fix the dielectric block 32 within the waveguide cavity 35.

[0048] like Figure 2 , Figure 4 As shown, along the direction away from the first part 321, the cross-sectional area of ​​the second part 322 gradually decreases, so that the second part 322 has a sheet structure.

[0049] Traditional X-band antennas typically have high dielectric blocks with high profiles, making them difficult to apply to conformal antennas for aircraft. To address this issue, the second part 322 of the dielectric block 32 in this invention has a thin-film structure and is excited by the waveguide cavity 35, through which the fundamental mode TE is excited. 10 The mode and adjacent higher-order modes obtain broadband characteristics. Since the second part 322 is a thin-film structure, the dielectric block 32 of the present invention significantly reduces the profile height of the X-band waveguide-fed dielectric antenna 3, and obtains higher gain and radiation efficiency, and effectively suppresses the cross-polarization of the X-band waveguide-fed dielectric antenna 3.

[0050] The second part 322 includes a first end and a second end opposite to each other, with the first end (large end) of the second part 322 connected to the first part 321. The input power is converted into a surface wave confined to the surface of the dielectric block 32 through the waveguide cavity until it radiates at the second end (small end, also called the end) of the second part 322, such that the reflection at the interface between the dielectric block 32 and the air in the waveguide cavity 35 is small.

[0051] From the large end to the small end, the electromagnetic wave phase velocity in the second part 322 gradually increases in order to make the electromagnetic wave phase velocity at the end close to the electromagnetic wave phase velocity in free space, thereby reducing the reflection at the end.

[0052] To ensure that the gain, main lobe width, side lobe level, and bandwidth of the X-band waveguide-fed dielectric antenna 3 meet the requirements, the length L of the second part 322 (i.e., the distance between the first end face and the second end face of the second part 322) and the end face area S of the first end of the second part 322 are determined. max Part 2, 322, the end face area S of the second end. min The following conditions must be met: (2) (3) (4) k represents the electromagnetic wave number in a vacuum, k z This indicates the electromagnetic wavenumber in X-band waveguide-fed dielectric antenna 3. This represents the wavelength in free space.

[0053] The overall volume of this invention is significantly reduced, thereby decreasing structural weight, simplifying sealing design, and substantially minimizing negative impacts on the structural strength and thermal protection system of the aircraft. Furthermore, this invention features wide bandwidth response, compact structure, small thickness, and low cost.

[0054] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0055] In the description of this invention, it should be understood that the terms "center," "height," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0056] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0058] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A dual-band conformal aperture composite antenna, characterized in that, include: The S-band circularly polarized phased array antenna and the X-band waveguide-fed dielectric antenna are mounted on a metal base plate, which is attached to the aircraft cabin. The S-band circularly polarized phased array antenna includes: A first dielectric substrate, a second dielectric substrate, and a third dielectric substrate are stacked sequentially from top to bottom, with the third dielectric substrate disposed on the metal base plate; Multiple microstrip patches are mounted on the upper surface of the first dielectric substrate; A power supply network is mounted on the lower surface of the second dielectric substrate; the power supply network includes multiple power dividers, which respectively supply power to multiple microstrip patches; The metal base plate is provided with multiple power-feed SSMA connectors, each corresponding to a power divider; each power divider includes an input terminal and two output terminals; the outer conductor of each power-feed SSMA connector is electrically connected to the metal base plate, the input terminal of each power divider is electrically connected to the inner conductor of the corresponding power-feed SSMA connector, and the output terminal of each power divider is electrically connected to the corresponding microstrip patch.

2. The dual-band conformal co-aperture composite antenna as described in claim 1, characterized in that, The X-band waveguide-fed dielectric antenna includes: a dielectric block, a feed SMA connector, a short-circuit block, a metal pressure block, and a waveguide cavity formed on the metal base plate; The dielectric block is disposed within the waveguide cavity, and the dielectric block is excited through the waveguide cavity; the dielectric block includes a first part and a second part that are connected to each other; along the direction away from the first part, the cross-sectional area of ​​the second part gradually decreases; The power supply SMA connector passes through the first part and is electrically connected to the first part; The short-circuit block is disposed in the waveguide cavity and is used to seal the waveguide cavity and adjust the impedance matching of the X-band waveguide-fed dielectric antenna. The metal pressure block is pressed onto the first part, and fasteners are sequentially inserted through the metal pressure block and the metal base plate to fix the dielectric block inside the waveguide cavity.

3. The dual-band conformal co-aperture composite antenna as described in claim 2, characterized in that, The second part includes a first end and a second end opposite to each other, with the first end of the second part connected to the first part; Let L represent the distance between the first end face of the second part and the second end face of the second part, and k represent the electromagnetic wave number in vacuum. z This indicates the electromagnetic wave number in the X-band waveguide-fed dielectric antenna. ； Let S max S represents the area of ​​the first end face of the second part. min This represents the area of ​​the second end face of the second part. This represents the dielectric constant of the dielectric block. Indicates the wavelength in free space; ； 。 4. The dual-band conformal aperture composite antenna as described in claim 1, characterized in that, The number of microstrip patches is four, arranged in a 2×2 array; The number of power dividers is four; in the clockwise direction, the output signals of the four power dividers have the same amplitude and their phases differ by 90° sequentially.

5. The dual-band conformal co-aperture composite antenna as described in claim 4, characterized in that, The microstrip patch has a rectangular structure, and the spacing between adjacent microstrip patches is denoted as d, which satisfies: ； in, For wavelength, The main beam angle.

6. The dual-band conformal co-aperture composite antenna as described in claim 1, characterized in that, The first dielectric substrate has multiple sets of metallized vias, which correspond to the positions of the multiple microstrip patches respectively; Each group of metallized vias includes two metallized vias, and the two output terminals of the power divider are electrically connected to the corresponding microstrip patch through the corresponding two metallized vias.

7. The dual-band conformal co-aperture composite antenna as described in claim 1, characterized in that, The power divider has a stripline structure, and impedance matching is achieved by adjusting the stripline width between the input and output terminals of the power divider.

8. The dual-band conformal co-aperture composite antenna as described in claim 1, characterized in that, Also includes: Antenna radome and metal retaining ring; The radome is mounted on the S-band circularly polarized phased array antenna; the outer periphery of the radome is provided with a flange; The metal pressure ring is pressed onto the flange, and the antenna cover is fixedly installed on the metal base plate by fasteners sequentially passing through the metal pressure ring and the metal base plate.

9. The dual-band conformal co-aperture composite antenna as described in claim 1, characterized in that, The upper surface of the second dielectric substrate and the lower surface of the third dielectric substrate are both provided with metal cladding.

10. The dual-band conformal co-aperture composite antenna as described in claim 1, characterized in that, The first dielectric substrate and the second dielectric substrate, as well as the second dielectric substrate and the third dielectric substrate, are bonded together by prepreg.

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