Dual-band dual-polarized co-axial antenna based on low-scattering wave-transparent structure

Abstract

The application discloses a kind of dual-frequency dual-polarization co-aperture antennas based on low scattering wave-transparent structure, including dielectric substrate, which is printed metal ground surface, the edge of metal ground surface is provided with low-frequency band dielectric substrate, and low-frequency band antenna is printed on low-frequency band dielectric substrate;Nylon column is vertically arranged in the center of metal ground surface, high-frequency band dielectric substrate is arranged at the top of nylon column, the top of nylon column is located at the center of high-frequency band dielectric substrate, and high-frequency band antenna is printed on high-frequency band dielectric substrate;The size of the low-frequency band antenna and the high-frequency band antenna, the height of the high-frequency band antenna from the metal floor, the size of the low scattering wave-transparent structure and the low-frequency band dielectric substrate and the metal ground surface are adjusted and optimized configuration, solve the problem that the co-aperture antenna installation space is small in the prior art, strong coupling is generated between antennas, influence each other normal work, make antenna performance deteriorate, can increase antenna operating bandwidth, reduce the size of antenna radiator, make gain, beam width and other far-field radiation characteristics stable.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and in particular to a dual-frequency dual-polarization common-aperture antenna based on a low-scattering transmission structure. Background Technology

[0002] Today, new communication methods are emerging one after another, and complex application scenarios are increasing daily, bringing many new challenges to wireless communication systems. Antennas, as devices for transmitting and receiving electromagnetic waves, are a crucial component of wireless communication systems, and their radiation performance directly affects communication quality. Therefore, wireless communication systems are placing increasingly stringent demands on antenna performance, requiring not only miniaturization and lightweight design, but also greater versatility in multi-band and multi-polarization capabilities.

[0003] A common-aperture antenna consists of multiple antennas that share the same aperture. Compared to placing individual antennas, it significantly saves space, leading to a continuous increase in demand for common-aperture antennas in wireless communication systems. Here, "multiple antennas" refers to multiple antennas with different structural designs, rather than antenna elements with identical structures found in traditional antenna arrays. The paper "Triband Dual-Polarized Shared-Aperture Antenna for 2G / 3G / 4G / 5G Base Station Applications" proposes a multi-band dual-polarized shared-aperture antenna with frequency selection capability (ZHOUG-N, SUN BH, LIANG QY, et al. Triband Dual-Polarized Shared-Aperture Antenna for 2G / 3G / 4G / 5G Base Station Applications[J]. IEEE Transactions on Antennas and Propagation, 2021, 69(1):97-108.). Its operating frequency band can cover 2G / 3G / 4G (1710-2690MHz) and 5G (3300-3600 and 4800-5000MHz) bands. In the design, the low-frequency band antenna is designed as a frequency-selective surface element of the mid-to-high frequency band antenna. This shared-aperture antenna can achieve tri-band operation. The paper "Low Scattering Element-Based Aperture-Shared Array for Multiband Base Stations" proposes a dual-wideband dual-polarized common-aperture antenna array (YANG SJ, YANG Y, ZHANG X Y. Low Scattering Element-Based Aperture-Shared Array for Multiband Base Stations[J]. IEEE Transactions on Antennas and Propagation, 2021, 69(12): 8315-8324.). This antenna places four periodic split-ring resonators on the low-frequency radiating arm. The periodic split-ring resonators and the radiating arm of the low-frequency antenna are located on opposite sides of the dielectric substrate, and can be equivalent to an LC parallel circuit. When the circuit resonates, the low-frequency antenna will exhibit bandpass characteristics at high frequencies. This design enables the low-frequency antenna to achieve low scattering characteristics in the high-frequency band, thereby reducing the radiation blockage of the high-frequency antenna by the low-frequency antenna. The above design is applied to the design of planar antenna structures, and the designed structure cannot be applied to the design of curved conformal antennas.

[0004] However, since a common aperture antenna is a compact installation of multiple antennas in the same small space, strong coupling usually occurs between the antennas, affecting their normal operation and thus leading to a deterioration in antenna performance. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention aims to provide a dual-band dual-polarization common-aperture antenna based on a low-scattering transparent structure. By designing the overall antenna structure and adjusting and optimizing the dimensions of the first low-frequency polarized antenna, the second low-frequency polarized antenna, the first low-frequency polarized antenna and the second low-frequency polarized antenna, the dimensions of the high-frequency polarized antenna and the high-frequency polarized antenna, the height of the high-frequency polarized antenna and the high-frequency polarized antenna from the metal ground, the dimensions of the low-scattering transparent structure, and the low-frequency dielectric substrate and the metal ground surface, the antenna's operating bandwidth can be increased, the size of the antenna radiator can be reduced, and the far-field radiation characteristics such as gain and beamwidth can be stabilized.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A dual-band dual-polarization common-aperture antenna based on a low-scattering transmission structure includes a dielectric substrate 11, a metal ground surface 10 printed on the dielectric substrate 11, a low-frequency dielectric substrate 5 vertically disposed at the edge of the metal ground surface 10, a low-frequency antenna printed on the low-frequency dielectric substrate 5, a nylon pillar 12 vertically disposed at the center of the metal ground surface 10, a high-frequency dielectric substrate 9 parallel to the metal ground surface 10 disposed at the top of the nylon pillar 12, the top of the nylon pillar 12 being located at the center of the high-frequency dielectric substrate 9, and a high-frequency antenna printed on the high-frequency dielectric substrate 9.

[0008] The low-frequency antenna includes a low-frequency polarized antenna assembly and a low-frequency polarized second antenna assembly printed on a low-frequency dielectric substrate 5. The low-frequency polarized antenna assembly and the low-frequency polarized second antenna assembly are orthogonally positioned.

[0009] The low-frequency polarized antenna assembly includes a first low-frequency polarized antenna 1 printed on a low-frequency dielectric substrate 5 and a second low-frequency polarized antenna 2 printed on the dielectric substrate 5 with rotational symmetry about a central axis.

[0010] The low-frequency polarized dual antenna assembly includes a first low-frequency polarized dual antenna 3 printed on a low-frequency dielectric substrate 5 and a second low-frequency polarized dual antenna 4 printed on the dielectric substrate 5 with rotational symmetry about a central axis.

[0011] The first low-frequency polarized antenna 1, the second low-frequency polarized antenna 2, the first low-frequency polarized second antenna 3, and the second low-frequency polarized second antenna 4 are all inverted F antennas with downward openings. The main radiating segments of the inverted F antennas are composed of an even number of low-scattering transparent structures 6.

[0012] The sum of the vertical height and the length of the horizontal arm of the first low-frequency polarized antenna 1, the second low-frequency polarized antenna 2, the first low-frequency polarized antenna 3, and the second low-frequency polarized antenna 4 is equal to one-quarter of the free-space wavelength of their center frequency.

[0013] The high-frequency antenna includes a high-frequency polarized antenna 7 and a high-frequency polarized antenna 8 printed on a high-frequency dielectric substrate 9. The high-frequency polarized antenna 7 and the high-frequency polarized antenna 8 are in a cross-shaped orthogonal position, and the intersection point is located at the center of the high-frequency dielectric substrate 9.

[0014] Both the high-frequency polarized antenna 7 and the high-frequency polarized antenna 8 are dipole antennas. The two dipole antennas are placed orthogonally in a cross shape. The length of each dipole antenna is half of the working wavelength, and the distance between each dipole antenna and the metal ground surface 10 is one-quarter of the working wavelength.

[0015] The length of each of the two dipole antennas is 35mm.

[0016] The distance between each of the two dipole antennas and the metal ground surface 10 is 46 mm.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. The antenna disclosed in this invention, based on the use of an inverted F antenna as a low-frequency antenna and a dipole antenna as a high-frequency antenna, combines and designs the feeding method according to the antenna radiation characteristics. Under the requirements of small size and weight, it achieves wide beam radiation within a wide operating bandwidth of the two frequency band antennas, while obtaining stable gain and radiation pattern.

[0019] 2. This invention employs a low-scattering, transparent structure 6 on the main radiating section of the low-frequency antenna, ensuring that interference between the two frequency band antennas remains within acceptable limits. In addition to excellent electrical performance, the antenna selection and assembly method are adapted to the simplest, most mature, and reliable manufacturing and installation processes possible, reducing complexity and error risks during production and installation, and fully meeting relevant vibration and environmental testing requirements.

[0020] 3. The antenna disclosed in this invention has a low-frequency antenna radiator that is rotationally symmetrically distributed around the central axis and located outside the aperture plane, while the high-frequency antenna is arranged in a cross shape inside the aperture plane and is directly fed to the feed section using coaxial cables. Both frequency band antennas are mounted on the same metal ground surface. This structure can ensure the symmetry and stability of the radiation pattern of each frequency band antenna, as well as the controllability of interference between each frequency band antenna and the stability of the overall antenna system.

[0021] In summary, the antenna disclosed in this invention has advantages such as compact and simple structure, easy and reliable installation of the antenna radiator, dual-band, wide beam, dual polarization, stable gain and radiation pattern, and is suitable for application in the field of wireless communication, including but not limited to base station communication, satellite communication and wireless local area network. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the overall three-dimensional structure of the antenna in this invention.

[0023] Figure 2 This is a top view of the overall three-dimensional structure of the antenna in this invention.

[0024] Figure 3 This is a diagram of the low-scattering structure used in the main radiating section of the low-frequency antenna in this invention.

[0025] Figure 4 This is a three-dimensional schematic diagram of the high-frequency antenna structure in this invention.

[0026] Figure 5 This is a top view of the three-dimensional structure of the high-frequency antenna in this invention.

[0027] Figure 6 The diagram shows the reflection and transmission coefficients of the low-scattering structure used in the main radiating section of the low-frequency antenna in this invention.

[0028] Figure 7 This is a diagram showing the reflection coefficient of the low-frequency band antenna in this invention.

[0029] Figure 8 This is the radiation pattern at the center frequency of the low-frequency band antenna in this invention, wherein... Figure 8 (a) shows the radiation pattern of the low-frequency band antenna at the center frequency. Figure 8 (b) is the radiation pattern at the center frequency of the low-frequency band antenna polarization two.

[0030] Figure 9 This is a diagram showing the reflection coefficient of the high-frequency antenna in this invention.

[0031] Figure 10 This is the radiation pattern at the center frequency of the high-frequency antenna in this invention, wherein... Figure 10(a) is the radiation pattern of the high-frequency antenna polarization at the center frequency point. Figure 10 (b) is the radiation pattern at the center frequency of the second polarization of the high-frequency antenna.

[0032] Figure 11 This is a diagram showing the isolation between low-frequency antenna ports in this invention.

[0033] Figure 12 This is a diagram showing the isolation between high-frequency antenna ports in this invention.

[0034] Figure 13 This is a diagram showing the isolation between high and low frequency antenna ports in the low-frequency band of the antenna in this invention.

[0035] Figure 14 This is a diagram showing the isolation between high and low frequency antenna ports in the low-frequency band of the antenna in this invention.

[0036] Figure 15 The diagram shows the radiation patterns of the high-frequency antenna in this invention under three different conditions.

[0037] In the figure, 1. First low-frequency polarized antenna, 2. Second low-frequency polarized antenna, 3. First low-frequency polarized antenna, 4. Second low-frequency polarized antenna, 5. Low-frequency dielectric substrate, 6. Low-scattering transparent structure, 7. High-frequency polarized antenna, 8. High-frequency polarized antenna, 9. High-frequency dielectric substrate, 10. Metal ground surface, 11. Dielectric substrate, 12. Nylon pillar. Detailed Implementation

[0038] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0039] See Figure 1 and Figure 2 A dual-band, dual-polarized, common-aperture antenna based on a low-scattering, transparent structure includes a dielectric substrate 11, a metal ground surface 10 printed on the dielectric substrate 11, a low-frequency dielectric substrate 5 perpendicularly disposed at the edge of the metal ground surface 10, and a low-frequency antenna printed on the low-frequency dielectric substrate 5; a nylon pillar 12 perpendicularly disposed at the center of the metal ground surface 10, and a high-frequency dielectric substrate 9 parallel to the metal ground surface 10 disposed at the top of the nylon pillar 12, with the top of the nylon pillar 12 located at the center of the high-frequency dielectric substrate 9, and a high-frequency antenna printed on the high-frequency dielectric substrate 9; the low-frequency antenna and the high-frequency antenna share the same metal ground surface 10, ensuring the symmetry and stability of the radiation pattern.

[0040] The metal ground surface 10 is preferably circular or square; the high-frequency dielectric substrate 9 is preferably square, circular, rhomboid or rectangular; and the low-frequency dielectric substrate 5 is preferably cylindrical.

[0041] The low-frequency antenna includes a low-frequency polarized antenna assembly and a low-frequency polarized second antenna assembly printed on the outer surface of a low-frequency dielectric substrate 5 wound into a cylindrical structure. The low-frequency polarized antenna assembly and the low-frequency polarized second antenna assembly are orthogonally positioned.

[0042] The low-frequency polarized antenna assembly includes a first low-frequency polarized antenna 1 printed on the outer surface of a low-frequency dielectric substrate 5 wound into a cylindrical structure, and a second low-frequency polarized antenna 2 printed on the dielectric substrate 5 with rotational symmetry about a central axis.

[0043] The low-frequency polarized dual antenna assembly includes a first low-frequency polarized dual antenna 3 printed on the outer surface of a low-frequency dielectric substrate 5 wound into a cylindrical structure, and a second low-frequency polarized dual antenna 4 printed on the dielectric substrate 5 with rotational symmetry about a central axis.

[0044] See Figure 3 The first low-frequency polarized antenna 1, the second low-frequency polarized antenna 2, the first low-frequency polarized antenna 3, and the second low-frequency polarized antenna 4 are all inverted F antennas with downward openings. The main radiating segments of the inverted F antennas are composed of four low-scattering transparent structures 6. A pair of inverted F antenna elements in relative positions realize one type of linear polarization, while another pair realizes another type of linear polarization orthogonal to it.

[0045] The sum of the vertical height and horizontal arm length of the inverted-F antenna elements of the first low-frequency polarized antenna 1, the second low-frequency polarized antenna 2, the first low-frequency polarized antenna 3, and the second low-frequency polarized antenna 4 is approximately equal to one-quarter of the free-space wavelength of its center frequency. In order not to affect the radiation of the high-frequency antenna, and to achieve sufficient operating bandwidth while taking into account the radiation pattern, the main radiating branches of the inverted-F are all composed of low-scattering transparent structures 6. This can eliminate the interference of the low-frequency antenna on the radiation pattern of the high-frequency antenna, so that the high-frequency antenna can maintain good radiation performance.

[0046] See Figure 4 and Figure 5 The high-frequency antenna includes a high-frequency polarized antenna 7 and a high-frequency polarized antenna 8 printed on a high-frequency dielectric substrate 9, which are in a cross-shaped orthogonal position, and the intersection point is located at the center of the high-frequency dielectric substrate 9; the high-frequency polarized antenna 7 and the high-frequency polarized antenna 8 are located at the center of the low-frequency dielectric substrate 5 structure formed by winding four low-frequency antennas, and are fixed at a certain height by nylon pillars placed on the metal ground surface 10.

[0047] Both the high-frequency polarized antenna 7 and the high-frequency polarized dual antenna 8 are dipole antennas, placed orthogonally in a cross shape to achieve mutually orthogonal linear polarization. Each dipole antenna is 4mm wide, 35mm long, and 46mm from the metal ground surface 10.

[0048] The thickness of the low-frequency dielectric substrate 5 is 0.5 mm.

[0049] The dielectric substrate 11 is preferably made of FR4 material, which can reduce the cost of the present invention; the low-frequency dielectric substrate 5 is preferably made of F4B material, which is soft and easy to bend; the high-frequency dielectric substrate 9 is preferably made of Rogers4003 material, as both F4B and Rogers4003 materials have low loss and can improve the efficiency of the antenna.

[0050] It should be noted that, in order to reduce antenna loss and improve antenna efficiency, other types of dielectric substrates can also be used in this design, and the antenna size can be finely adjusted according to the actual dielectric constant.

[0051] The low-frequency and high-frequency antennas described in this invention are integrated within the same aperture plane in an outward-to-inward arrangement. Each frequency band antenna achieves dual polarization with two sets of antennas. When one set of antennas is connected to an excitation source and is operating, the other set of antennas in the same frequency band and other frequency band antennas are connected to matching loads to achieve one polarization. Switching the states of the two sets of antennas in the same frequency band allows the same amplitude and phase excitation source to excite another polarization.

[0052] The low-frequency antenna of this invention has an operating bandwidth of 470-500MHz, with both polarization reflection coefficients less than -10dB, and a beamwidth greater than 150° in the zenith direction with a gain of -7dB or higher. The high-frequency antenna has an operating bandwidth of 1.5-1.65GHz, with both polarization reflection coefficients less than -10dB, a maximum gain of 7.56dB at the center frequency, and a half-power beamwidth greater than 65° in the zenith direction.

[0053] This invention's antenna generates two polarizations of radiation in both frequency bands. This antenna can be applied in the field of wireless communication, including but not limited to base station communication, satellite communication, and wireless local area networks. This antenna system can be used in applications requiring multi-band zenith-direction wide-beam radiation within constraints of size and weight.

[0054] Specifically, the first low-frequency polarized antenna 1, the second low-frequency polarized antenna 2, the first low-frequency polarized second antenna 3, and the second low-frequency polarized second antenna 4 in this invention are mainly composed of a low-scattering transparent structure 6. The four antennas are printed on a low-frequency dielectric substrate 5 and are orthogonally placed around a central axis. By adjusting parameters such as the length and width of the radiating stubs and the length and width of the four antennas, the input impedance and bandwidth of the antennas can be matched.

[0055] In this invention, a high-frequency polarized antenna 7 and a high-frequency polarized secondary antenna 8 are orthogonally printed on a high-frequency dielectric substrate 9, forming a pair of orthogonal dipole antennas. The high-frequency polarized antenna 7 and the high-frequency polarized secondary antenna 8 are coaxially fed. To avoid the inner cores of the coaxial lines intersecting, a bridge circuit is placed at the intersection point. By adjusting parameters such as the length and width of the high-frequency polarized antenna 7 and the high-frequency polarized secondary antenna 8, and the height of the dipole antennas above ground, the input impedance and bandwidth of the antennas can be matched.

[0056] Figure 6 This is the reflection coefficient curve of the low-scattering transmission structure 6 disclosed in this invention. This structure exhibits good transmission characteristics in the 1.5-1.65GHz frequency band, with a reflection coefficient of less than -10dB and a transmission coefficient of approximately 0 in the frequency band.

[0057] Figure 7 These are the reflection coefficient curves of two polarization modes of the low-frequency antenna disclosed in this invention. The antenna can operate in a bandwidth of 470-500MHz, and the reflection coefficients of polarization one and polarization two are both less than -10dB.

[0058] Figure 8 These are the radiation patterns of two polarizations of the low-frequency band antenna disclosed in this invention at the center frequency, wherein... Figure 8 (a) shows the radiation pattern of the low-frequency band antenna at the center frequency. Figure 8 (b) shows the radiation pattern at the center frequency of the low-frequency antenna polarization 2. This antenna can achieve a beamwidth radiation of 150° with a gain of over -7dB in the zenith direction with both orthogonal linear polarizations in the low-frequency band, exhibiting good linear polarization characteristics and wide beamwidth characteristics.

[0059] Figure 9 These are the reflection coefficient curves of the high-frequency antenna disclosed in this invention, which has a working bandwidth of 1.5-1.65GHz and reflection coefficients of polarization 1 and polarization 2 are both less than -10dB.

[0060] Figure 10 These are the radiation patterns of the high-frequency antenna disclosed in this invention at the center frequency point, including two polarizations. Figure 10 (a) is the radiation pattern of the high-frequency antenna polarization at the center frequency point. Figure 10(b) shows the radiation pattern at the center frequency of the high-frequency antenna polarization 2. The maximum gain of the antenna in the high-frequency band with two orthogonal linear polarizations is 7.56dB. Both polarizations can radiate with a beamwidth of more than 65° in the zenith direction with half-power beamwidth, exhibiting good linear polarization characteristics and wide beam characteristics.

[0061] Figure 11 This refers to the isolation between the two polarizations of the low-frequency antenna disclosed in this invention, which has a port isolation greater than 25dB within its operating bandwidth of 470-500MHz.

[0062] Figure 12 This refers to the isolation between the two polarizations of the high-frequency antenna disclosed in this invention. The port isolation of this antenna is greater than 25dB within its operating bandwidth of 1.5-1.65GHz.

[0063] Figure 13 The isolation of the high and low frequency band antennas disclosed in this invention is greater than 20dB in the low frequency band. The port isolation of the antennas in the two frequency bands is greater than 20dB within the operating bandwidth of 470-500MHz.

[0064] Figure 14 This refers to the isolation of the high- and low-frequency band antenna disclosed in this invention within the high-frequency band. The port isolation of this antenna is greater than 35dB within the operating bandwidth of 1.5-1.65GHz.

[0065] Figure 15 This is a comparison of the radiation patterns of the high-frequency antenna disclosed in this invention under different conditions. The first condition is the radiation pattern of the high-frequency antenna radiating alone. The second condition is the radiation pattern of the high-frequency antenna when a low-scattering transmission structure is added to the main radiating section of the inverted-F antenna. The third condition is the radiation pattern of the high-frequency antenna when the inverted-F antenna is not equipped with a low-scattering transmission structure.

[0066] In summary, the present invention adjusts and optimizes the dimensions of the first low-frequency polarized antenna 1, the second low-frequency polarized antenna 2, the first low-frequency polarized antenna 3, and the second low-frequency polarized antenna 4; the dimensions of the high-frequency polarized antenna 7 and the high-frequency polarized antenna 8; the height of the high-frequency polarized antenna 7 and the high-frequency polarized antenna 8 from the metal ground; the dimensions of the low-scattering transparent structure 6; and the low-frequency dielectric substrate 5 and the metal ground surface 10. This can increase the antenna operating bandwidth, reduce the size of the antenna radiator, and stabilize the far-field radiation characteristics such as gain and beamwidth.

Claims

1. A dual-frequency, dual-polarized, common-aperture antenna based on a low-scattering, transparent structure, comprising a dielectric substrate (11) on which a metallic ground surface (10) is printed, characterized in that, A low-frequency dielectric substrate (5) is vertically disposed on the edge of the metal ground surface (10), and a low-frequency antenna is printed on the low-frequency dielectric substrate (5); a nylon column (12) is vertically disposed at the center of the metal ground surface (10), and a high-frequency dielectric substrate (9) parallel to the metal ground surface (10) is disposed at the top of the nylon column (12), with the top of the nylon column (12) located at the center of the high-frequency dielectric substrate (9), and a high-frequency antenna is printed on the high-frequency dielectric substrate (9). The low-frequency antenna includes a low-frequency polarized antenna assembly and a low-frequency polarized second antenna assembly printed on the outer surface of a low-frequency dielectric substrate (5) wound into a cylindrical structure. The low-frequency polarized antenna assembly and the low-frequency polarized second antenna assembly are in an orthogonal positional relationship. The low-frequency polarized antenna assembly includes a first low-frequency polarized antenna (1) printed on a low-frequency dielectric substrate (5) and a second low-frequency polarized antenna (2) printed on the low-frequency dielectric substrate (5) with rotational symmetry about the central axis. The low-frequency polarized dual antenna assembly includes a first low-frequency polarized dual antenna (3) printed on a low-frequency dielectric substrate (5) and a second low-frequency polarized dual antenna (4) printed on a low-frequency dielectric substrate (5) with rotational symmetry about the central axis. The first low-frequency polarized antenna (1), the second low-frequency polarized antenna (2), the first low-frequency polarized antenna (3), and the second low-frequency polarized antenna (4) are all inverted F antennas with downward openings. The main radiating segments of the inverted F antennas are composed of an even number of low-scattering transparent structures (6). The high-frequency antenna includes a high-frequency polarized antenna (7) and a high-frequency polarized antenna (8) printed on a high-frequency dielectric substrate (9). The high-frequency polarized antenna (7) and the high-frequency polarized antenna (8) are in a cross-shaped orthogonal position relationship, and the intersection point is located at the center of the high-frequency dielectric substrate (9). Both the high-frequency polarized antenna (7) and the high-frequency polarized antenna (8) are dipole antennas, and the two dipole antennas are placed in a cross shape orthogonally.

2. The dual-frequency dual-polarization common-aperture antenna based on a low-scattering transmission structure according to claim 1, characterized in that, The sum of the vertical height and the length of the horizontal arm of the first low-frequency polarized antenna (1), the second low-frequency polarized antenna (2), the first low-frequency polarized dual antenna (3), and the second low-frequency polarized dual antenna (4) is equal to one-quarter of the free space wavelength of its center frequency.

3. The dual-frequency, dual-polarization, common-aperture antenna based on a low-scattering transmission structure according to claim 1, characterized in that, The lengths of the two dipole antennas are both half the operating wavelength, and the distances of the two dipole antennas from the metal ground surface (10) are both one-quarter of the operating wavelength.

4. The dual-frequency dual-polarization common-aperture antenna based on a low-scattering transmission structure according to claim 3, characterized in that, The length of each of the two dipole antennas is 35mm.

5. A dual-frequency, dual-polarization, common-aperture antenna based on a low-scattering transmission structure according to claim 3 or 4, characterized in that, The distance between the two dipole antennas and the metal ground surface (10) is 46 mm.

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