A high-isolation parallel feed structure for dual-polarized curved surface radiators

Abstract

The present application relates to the technical fields of antenna engineering, aiming at solving the problems of complex structure, easy interference layout, poor shielding performance, low isolation, large port mutual coupling and poor curved conformal adaptability of the existing dual-polarized curved radiating body feed structure, and providing a high-isolation parallel feed structure for dual-polarized curved radiating body, comprising a horizontal polarization balanced feed network and a vertical polarization balanced feed network, which are arranged in parallel; the horizontal polarization balanced feed network is used for connecting with a horizontal dipole antenna radiating body, and the vertical polarization balanced feed network is used for connecting with a vertical dipole antenna radiating body; the horizontal dipole antenna radiating body and the vertical dipole antenna radiating body are curved antennas; the present application realizes dual-polarized parallel feed by using double independent balanced feed networks, without twisting the radiating units, and has simple structure, solves the problems of curved conformal installation space interference and complex structure, and has good curved conformal adaptability.

Description

Technical Field

[0001] This invention relates to the field of antenna engineering technology, and more specifically, to a high-isolation parallel feed structure for a dual-polarized curved surface radiator. Background Technology

[0002] To meet the demands of modern electronic equipment, numerous sensor antennas are deployed on various platforms such as aircraft, missiles, and satellites to perform tasks including communication, reconnaissance, jamming, warning, and navigation support. Traditionally, radiators are mostly regular planar structures, inconsistent with the platform's shape, resulting in bulges throughout the mounting platform and affecting aerodynamics. Therefore, non-planar radiators need to be designed according to the aircraft's shape to minimize their aerodynamic impact. Furthermore, to ensure signal reception on mobile platforms, orthogonal dual-polarized antennas, compared to single-polarized antennas, can maximize the acquisition of electromagnetic wave polarization information, avoiding signal loss. Therefore, non-planar dual-polarized radiators have promising engineering application prospects on high-speed operating platforms.

[0003] Most existing dual-polarized antennas adopt orthogonal dual-polarized feeding structures, such as CN116154472A and CN107046167A. The overall layout of the feeding structure is complex, and the orthogonal cross design without twisting leads to interference problems in the feeding structure space when adapting to the conformal shape of curved surfaces, making processing and assembly difficult.

[0004] Some dual-polarized antenna feeding improvement schemes, such as CN115458920A, change the structure of the radiator by twisting the feeding direction of the radiating element port, and adjust the orthogonal cross feeding structure to a parallel feeding structure. Although this optimizes the installation space to a certain extent, the traditional balanced dual-line feeding network has no shielding structure, which makes it easy to participate in the antenna radiation process, interfere with the antenna radiation performance, and has large mutual coupling between ports, affecting the working stability of the antenna array.

[0005] Some dual-polarized antenna port isolation improvement solutions, such as CN108767452B, rely on isolation walls and decoupling stubs to passively compensate for isolation, rather than solving the isolation problem from the root of the feed structure. The balun is a single-layer microstrip line structure without a shielded cavity, so the feed will still participate in radiation, resulting in pattern distortion.

[0006] In summary, existing dual-polarized curved surface radiator feeding structures suffer from problems such as complex structure, easy layout interference, poor shielding performance, low isolation, large port mutual coupling, and poor conformal adaptability of curved surfaces. Summary of the Invention

[0007] The present invention aims to provide a high-isolation parallel feeding structure for dual-polarized curved surface radiators, so as to solve the problems of existing dual-polarized curved surface radiator feeding structures, such as complex structure, easy layout interference, poor shielding performance, low isolation, large port mutual coupling, and poor conformal adaptability of curved surfaces.

[0008] This invention is achieved using the following technical solution: The present invention provides a high-isolation parallel feed structure for a dual-polarized curved surface radiator, comprising a horizontally polarized balanced feed network and a vertically polarized balanced feed network, wherein the horizontally polarized balanced feed network and the vertically polarized balanced feed network are arranged in parallel. The horizontal polarization balanced feed network is used to connect to the horizontal dipole antenna radiator, and the vertical polarization balanced feed network is used to connect to the vertical dipole antenna radiator. The horizontal dipole antenna radiator and the vertical dipole antenna radiator are curved antennas.

[0009] As a preferred technical solution: The vertical polarization balanced feed network includes a first shielded graded double-line balun and a torsion structure; the first shielded graded double-line balun is connected to the torsion structure, and the torsion structure is connected to the vertical dipole antenna radiator; The horizontally polarized balanced feed network includes a second shielded tapered double-line balun and a balanced double-line structure; the second shielded tapered double-line balun is connected to the balanced double-line structure, and the balanced double-line structure is connected to the horizontal dipole antenna radiator.

[0010] As a preferred technical solution: Both the horizontal dipole antenna radiator and the vertical dipole antenna radiator include two symmetrically arranged radiating arms, each radiating arm having a curved surface structure and a feeding gap between the two radiating arms. The two radiating arms of the horizontal dipole antenna radiator are respectively the left and right ends of its two radiating arms. The two radiating arms of the vertical dipole antenna radiator have their upper and lower ends facing each other, respectively.

[0011] As a preferred technical solution: The first shielded gradient double-line balun includes a first upper layer, a first middle layer, and a first lower layer; The first middle layer is disposed between two dielectric substrates, namely a first dielectric substrate and a second dielectric substrate, the first upper layer is disposed on the upper surface of the first dielectric substrate, and the first lower layer is disposed on the lower surface of the second dielectric substrate. The first middle layer is located between the first upper layer and the first lower layer, and the first upper layer, the first middle layer, and the first lower layer are parallel to each other; The first upper layer and the first lower layer are shielding grounding layers, and the first middle layer is a transmission layer.

[0012] As a preferred technical solution: Both the first upper layer and the first lower layer are metal layers, and they are interconnected by metallized vias.

[0013] As a preferred technical solution: The positive pole of the torsion structure is connected to the upper end of the vertical dipole antenna radiator, and the negative pole of the torsion structure is connected to the lower end of the vertical dipole antenna radiator.

[0014] As a preferred technical solution: The positive electrode of the torsion structure includes a first upper metal sheet, a middle metal sheet, and a first lower metal sheet arranged sequentially at intervals. The first upper metal sheet, the middle metal sheet, and the first lower metal sheet are interconnected through a first metallized through-hole. The exposed first upper metal sheet and the first lower metal sheet are connected to the upper end of the vertical dipole antenna radiator. The middle layer metal sheet and the first middle layer are integrally formed as a continuous metal conductor strip; The first middle layer includes gradient lines, strip lines, and microstrip lines; The first middle layer gradually increases in line width from the end connected to the middle layer metal sheet. This segment is the gradient line, used to achieve broadband impedance matching. After the line width increases to a preset value, it enters a constant width segment, which is the strip line. The end of the strip line extends to the RF connector, where it transforms from the strip line into the microstrip line. The negative electrode of the torsion structure includes a second upper metal sheet and a second lower metal sheet arranged at intervals, and the second upper metal sheet and the second lower metal sheet are interconnected through a second metallized through hole; the exposed second upper metal sheet and the second lower metal sheet are connected to the lower end of the vertical dipole antenna radiator; The second upper metal sheet and the first upper layer are integrally formed as a continuous metal strip, and the second lower metal sheet and the first lower layer are integrally formed as a continuous metal strip.

[0015] As a preferred technical solution: The metal sheet can be a rectangular metal sheet.

[0016] As a preferred technical solution: The structure of the second shielded gradient double-line balun is the same as that of the first shielded gradient double-line balun; The second shielded gradient double-line balun includes a second upper layer, a second middle layer, and a second lower layer. The second middle layer is located between the second upper layer and the second lower layer, and the three layers are parallel to each other.

[0017] As a preferred technical solution: The positive pole of the balanced bipolar structure is connected to the left end of the horizontal dipole antenna radiator, and the negative pole of the balanced bipolar structure is connected to the right end of the horizontal dipole antenna radiator.

[0018] As a preferred technical solution: The positive electrode of the balanced double-wire structure and the second middle layer are integrally formed continuous metal conductive strips; The second middle layer includes gradient lines, strip lines, and microstrip lines; The second middle layer gradually increases in line width from the end connected to the positive electrode of the balanced bipolar structure. This section is the gradient line, used to achieve broadband impedance matching. After the line width increases to a preset value, it enters a constant width section, which is the stripline. The end of the stripline extends to the RF connector, where it transforms from the stripline into the microstrip line. The negative electrode of the balanced bilinear structure includes a third upper metal sheet and a third lower metal sheet arranged at intervals, and the third upper metal sheet and the third lower metal sheet are interconnected through a third metallized through-hole. The third upper metal sheet and the second upper layer are integrally formed as a continuous metal strip, and the third lower metal sheet and the second lower layer are integrally formed as a continuous metal strip.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This invention uses a dual independent balanced power supply network to achieve dual-polarized parallel power supply, eliminating the need for a torsional radiation unit. The structure is simple and compact, fundamentally solving the problems of spatial interference and complex structure in conformal installation of large curvature surfaces. It exhibits excellent conformal adaptability in confined spaces such as aircraft surfaces and conformal cabins. 2. The feeding network of the present invention has good shielding effect, good isolation effect, low mutual coupling between ports, and the feeding network does not participate in antenna radiation, but only realizes stable signal transmission, effectively avoiding the adverse effects of the feeding structure on the radiation pattern, gain and port standing wave. 3. The invention has a simple overall structure. Through the integrated design of the power supply structure and transmission line, the external electrical interface of the antenna can be flexibly arranged in the required position of the structure, effectively avoiding spatial interference and facilitating efficient interconnection with other modules. Attached Figure Description

[0020] Figure 1 This is a front view of the high-isolation parallel feed structure for a dual-polarized curved surface radiator as described in this invention.

[0021] Figure 2 This is a side view of the high-isolation parallel feed structure for a dual-polarized curved surface radiator according to the present invention.

[0022] Figure 3 This is a three-dimensional schematic diagram of the high-isolation parallel feed structure for a dual-polarized curved surface radiator as described in this invention.

[0023] Figure 4 This is a three-dimensional schematic diagram of the vertically polarized balanced feed network described in this invention.

[0024] Figure 5 This is a three-dimensional schematic diagram of the horizontally polarized balanced feeder network described in this invention.

[0025] Figure 6 The voltage standing wave ratio (VSWR) curve for a vertically polarized balanced feeder network.

[0026] Figure 7 The transmission coefficient curve is shown for a vertically polarized balanced feeder network.

[0027] Figure 8 The voltage standing wave ratio (VSWR) curve is shown for a horizontally polarized balanced feeder network.

[0028] Figure 9 The transmission coefficient curve is shown for a horizontally polarized balanced feeder network.

[0029] Figure 10 The port isolation curves are simulated for a high-isolation parallel feed structure.

[0030] Icons: 1-Horizontal dipole antenna radiator, 2-Vertical dipole antenna radiator, 3-Horizontal polarization balanced feed network, 4-Vertical polarization balanced feed network, 311-Second upper layer, 312-Second middle layer, 313-Second lower layer, 314-Second microstrip line, 411-First upper layer, 412-First middle layer, 413-First lower layer, 414-First microstrip line, 31-Third upper layer rectangular metal sheet, 32-Third lower layer rectangular metal sheet, 33-Third metallized via, 34-Positive pole of balanced double-line structure, 41-First upper layer rectangular metal sheet, 42-Middle layer rectangular metal sheet, 43-First lower layer rectangular metal sheet, 44-First metallized via, 45-Second upper layer rectangular metal sheet, 46-Second lower layer rectangular metal sheet, 47-Second metallized via. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1 like Figures 1-5 As shown, this embodiment proposes a high-isolation parallel feed structure for a dual-polarized curved surface radiator, including a horizontally polarized balanced feed network 3 and a vertically polarized balanced feed network 4. The horizontally polarized balanced feed network 3 and the vertically polarized balanced feed network 4 are arranged in parallel to form a parallel feed structure, avoiding physical structural interference caused by orthogonal arrangement. The horizontal polarization balanced feed network 3 is used to connect with the horizontal dipole antenna radiator 1 by welding, and the vertical polarization balanced feed network 4 is used to connect with the vertical dipole antenna radiator 2 by welding. The horizontal dipole antenna radiator 1 and the vertical dipole antenna radiator 2 are curved antennas.

[0033] The vertical polarization balanced feed network 4 includes a first shielded gradient bilinear balun and a torsion structure; The first shielded gradient double-line balun adopts a double-layer balun reuse design. The first shielded gradient double-line balun includes a first upper layer 411, a first middle layer 412, and a first lower layer 413. The first middle layer 412 is disposed between two dielectric substrates, namely a first dielectric substrate and a second dielectric substrate. The first upper layer 411 is disposed on the upper surface of the first dielectric substrate, and the first lower layer 413 is disposed on the lower surface of the second dielectric substrate. Therefore, the first middle layer 412 is located between the first upper layer 411 and the first lower layer 413. The first upper layer 411, the first middle layer 412, and the first lower layer 413 are parallel to each other. The first upper layer 411 and the first lower layer 413 are both metal layers, and they are interconnected through metallized vias. The metal layers are etched onto the surface of the dielectric substrate, which is existing technology and will not be described in detail. The metal patterns of the first upper layer 411 and the first lower layer 413 are completely identical in size and shape. They are the shielding grounding layers of the first shielded gradient double-wire balun structure, used to optimize impedance matching effect; the first middle layer 412 is the transmission layer.

[0034] This invention forms a fully enclosed electromagnetic shield for the intermediate feeder (i.e., the first upper layer 411 and the first lower layer 413) through inner and outer shielding layers, giving the feeder network excellent electromagnetic shielding performance. This effectively prevents the feeder network from directly radiating or receiving interference signals, ensuring that the feeder network does not participate in antenna radiation and only undertakes signal transmission functions. At the same time, it improves the port isolation between the two sets of parallel feeder networks.

[0035] Both the horizontal dipole antenna radiator 1 and the vertical dipole antenna radiator 2 include two symmetrically arranged radiating arms, each radiating arm having a curved surface structure, and a feeding gap between the two radiating arms. The two radiating arms of the horizontal dipole antenna radiator 1 are respectively the left and right ends of its two radiating arms. The two radiating arms of the vertical dipole antenna radiator 2 are respectively located at their upper and lower ends.

[0036] The positive pole of the torsion structure is connected to the upper end of the vertical dipole antenna radiator 2, and the negative pole of the torsion structure is connected to the lower end of the vertical dipole antenna radiator 2. Specifically, the connection method is welding interconnection.

[0037] The positive pole of the torsion structure includes a first upper rectangular metal sheet 41, a middle rectangular metal sheet 42, and a first lower rectangular metal sheet 43 arranged at intervals in sequence. The first upper rectangular metal sheet 41, the middle rectangular metal sheet 42, and the first lower rectangular metal sheet 43 are interconnected through a first metallized through-hole 44. The exposed first upper rectangular metal sheet 41 and the first lower rectangular metal sheet 43 are connected to the upper end of the vertical dipole antenna radiator 2 by welding. The middle rectangular metal sheet 42 and the first middle layer 412 (i.e., the intermediate feed line) of the first shielded gradient dual-line balun are integrally formed continuous metal conductors. The first middle layer 412 includes a gradient line, a strip line, and a microstrip line. The line width of the first middle layer 412 gradually increases from the end connected to the middle rectangular metal sheet 42. This section is the gradient line, which is used to achieve broadband impedance matching. After the line width increases to a preset value, it enters a constant width section, which is the strip line. The end of the strip line extends to the RF connector and changes from a strip line to a microstrip line (the width of the microstrip line is greater than the width of the strip line, which is the first microstrip line 414 here) to achieve standard impedance matching connection with the RF connector. Therefore, the vertical polarization balanced feed network 4 adopts an integrated transmission transition structure of a shielded tapered dual-line balun, a tapered line, and a microstrip line. After passing through the torsion structure, the signal enters the tapered dual-line balun segment of the vertical polarization balanced feed network 4. The impedance is initially matched by the tapered line width. Then, the tapered dual-line balun smoothly transitions to a stripline, and finally transforms from a stripline to a microstrip line, achieving a standard impedance matching connection with the RF connector.

[0038] The negative electrode of the torsion structure includes a second upper rectangular metal sheet 45 and a second lower rectangular metal sheet 46 arranged at intervals. The second upper rectangular metal sheet 45 and the second lower rectangular metal sheet 46 are interconnected through a second metallized through hole 47. The exposed second upper rectangular metal sheet 45 and the second lower rectangular metal sheet 46 are connected to the lower end of the vertical dipole antenna radiator 2 by welding. The second upper rectangular metal sheet 45 and the first upper layer 411 of the first shielded gradient double-line balun are integrally formed continuous metal strips, and the second lower rectangular metal sheet 46 and the first lower layer 413 of the first shielded gradient double-line balun are integrally formed continuous metal strips.

[0039] The horizontally polarized balanced feed network 3 includes a second shielded tapered double-line balun and a balanced double-line structure. The structure of the second shielded tapered double-line balun is the same as that of the first shielded tapered double-line balun. The second shielded tapered double-line balun includes a second upper layer 311, a second middle layer 312, and a second lower layer 313. The second middle layer 312 is located between the second upper layer 311 and the second lower layer 313. The three layers are parallel to each other. Other details are not elaborated.

[0040] The positive pole of the balanced double-wire structure is connected to the left end of the horizontal dipole antenna radiator 1, and the negative pole of the balanced double-wire structure is connected to the right end of the horizontal dipole antenna radiator 1. Specifically, the connection method is welding interconnection.

[0041] The positive electrode 34 of the balanced dual-wire structure and the second middle layer 312 (i.e., the intermediate feed line) of the second shielded gradient dual-wire balun are integrally formed continuous metal strips. The line width of the second middle layer 312 gradually increases from the end connected to the positive electrode 34 of the balanced dual-wire structure. This section is a gradient line used to achieve broadband impedance matching. After the line width increases to a preset value, it enters a constant width section, which is a strip line. The end of the strip line extends to the RF connector and transforms from a strip line to a microstrip line (the width of the microstrip line is greater than that of the strip line, here it is the second microstrip line 314) to achieve standard impedance matching connection with the RF connector.

[0042] The negative electrode of the balanced double-wire structure includes a third upper rectangular metal sheet 31 and a third lower rectangular metal sheet 32 ​​arranged at intervals, and the third upper rectangular metal sheet 31 and the third lower rectangular metal sheet 32 ​​are interconnected through a third metallized through-hole 33. The third upper rectangular metal sheet 31 and the second upper layer 311 of the second shielded gradient double-line balun are integrally formed continuous metal strips, and the third lower rectangular metal sheet 32 ​​and the second lower layer 313 of the second shielded gradient double-line balun are integrally formed continuous metal strips.

[0043] Please see Figures 1-3 and combined Figure 4 and Figure 5 As shown, after passing through the torsion structure / balanced dual-line structure, the signal enters the shielded gradient dual-line balun segment (i.e., the first shielded gradient dual-line balun and the second shielded gradient dual-line balun). The impedance is initially matched by the gradual change in line width of the first middle layer 412 and the second middle layer 312. Subsequently, the gradient line smoothly transitions into a stripline, and finally transforms from a stripline into a microstrip line to achieve a standard impedance matching connection with the RF connector.

[0044] In this embodiment, the dielectric substrate of the high-isolation parallel-fed structure is polyimide (PI) with a dielectric constant of 3.2 and a dielectric loss tangent of 0.007. The thickness of both dielectric substrates is 0.3 mm, and there is a 0.025 mm thick adhesive film (BT25) in the middle. The total thickness of the dielectric substrate is 0.625 mm (excluding the copper layer) and the total width is 6 mm. The first shielded gradient double-line balun and the second shielded gradient double-line balun have a gradient segment length of 12mm, a strip length of 3mm and a line width of 0.3mm, and a microstrip length of 3mm and a line width of 0.7mm. The spacing between the horizontal polarization balanced feed network 3 and the vertical polarization balanced feed network 4 is 6.25 mm.

[0045] Full-wave simulation of the high-isolation parallel feed structure in this embodiment was performed using electromagnetic simulation software. The port matching characteristics, transmission characteristics, and isolation characteristics of the feed structure were obtained. The simulation results are as follows: Figure 6 and Figure 7 The voltage standing wave ratio (VSWR) and transmission coefficient of the vertically polarized balanced feed network are given respectively. It can be seen that the operating bandwidth of the vertically polarized feed structure of the present invention is 4GHz-12GHz when the VSWR is less than 1.5, the relative bandwidth is 100%, the transmission loss is less than 0.6dB, and it has good broadband impedance matching and low-loss transmission characteristics.

[0046] Figure 8 and Figure 9 The voltage standing wave ratio (VSWR) and transmission coefficient of the horizontally polarized balanced feed network are given respectively. It can be seen that the operating bandwidth of the horizontally polarized feed structure of the present invention is 4GHz-12GHz when the VSWR is less than 1.5, the relative bandwidth is 100%, the transmission loss is less than 0.5dB, and it has good broadband impedance matching and low-loss transmission characteristics.

[0047] Figure 10 The port isolation of the high-isolation parallel feed structure (including the horizontally polarized balanced feed network 3 and the vertically polarized balanced feed network 4) is given. It can be seen that the high-isolation parallel feed structure of the present invention has an isolation greater than 30dB between ports in the operating frequency range of 4GHz-12GHz, and the high-isolation parallel feed structure has excellent electromagnetic shielding performance.

[0048] In summary, this invention proposes a high-isolation parallel feed structure for dual-polarized curved radiators. Addressing the problems of complex structures, easy interference in layout, poor shielding performance, low isolation, large port coupling, and poor conformal adaptability of existing dual-polarized curved radiator feed structures, this invention achieves a breakthrough by adapting the feed port space to the differences in vertical and horizontal polarization antenna layouts (i.e., designing a torsional structure). It employs an integrated transition of a shielded tapered dual-line balun (tapered line + stripline + microstrip line) to achieve low-loss broadband impedance transformation, and uses a double-layer balun multiplexing to form a fully shielded cavity. This breakthrough achieves technical advancements in both the parallel layout of the feed structure and the shielding performance. This scheme enables two sets of polarization feed networks to be drawn out in a regular parallel manner, combining the advantages of wideband matching, high shielding, high isolation, and compact structure, effectively solving the engineering challenges of curved dual-polarized radiators.

[0049] The high-isolation parallel feeding structure of this invention employs two sets of balanced feeding networks: vertically polarized and horizontally polarized. The main structures, transmission paths, and electrical characteristics of these two networks are essentially identical. The core difference lies in the torsional structure of the feeding ports: this torsional structure twists the initially horizontally distributed balanced bi-line structure of the input, causing the feeding networks to be arranged vertically, thus precisely matching the feeding requirements of the two orthogonally polarized radiating units. While ensuring that the two sets of feeding networks are arranged in a parallel manner, differential balanced feeding can be achieved for vertically polarized radiating units arranged vertically and horizontally polarized radiating units arranged horizontally, simplifying the overall structural design and avoiding additional phase and amplitude errors introduced by the differences in the feeding networks.

[0050] The high-isolation parallel feed structure of the present invention is simple and compact, with no interference in layout, excellent shielding effect, good isolation, small port mutual coupling and easy assembly and interconnection. The curved antenna design ensures good conformal adaptability of the curved surface, which solves the problems of existing dual-polarized curved radiator feed structures, such as complex structure, easy interference in layout, poor shielding performance, low isolation, large port mutual coupling and poor conformal adaptability of curved surface.

[0051] This invention relates to dual-polarized dipole antennas and antenna arrays that require balanced feeding, and is particularly suitable for applications with high requirements for installation space, structural integration, shielding performance and system interconnectivity, such as aircraft surfaces, conformal cabins, and large curvature curved surfaces.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-isolation parallel feed structure for a dual-polarized curved surface radiator, characterized in that: It includes a horizontally polarized balanced feed network and a vertically polarized balanced feed network, wherein the horizontally polarized balanced feed network and the vertically polarized balanced feed network are arranged in parallel. The horizontal polarization balanced feed network is used to connect to the horizontal dipole antenna radiator, and the vertical polarization balanced feed network is used to connect to the vertical dipole antenna radiator. The horizontal dipole antenna radiator and the vertical dipole antenna radiator are curved antennas.

2. The high-isolation parallel feed structure for a dual-polarized curved surface radiator according to claim 1, characterized in that: The vertical polarization balanced feed network includes a first shielded graded double-line balun and a torsion structure; the first shielded graded double-line balun is connected to the torsion structure, and the torsion structure is connected to the vertical dipole antenna radiator; The horizontally polarized balanced feed network includes a second shielded tapered double-line balun and a balanced double-line structure; the second shielded tapered double-line balun is connected to the balanced double-line structure, and the balanced double-line structure is connected to the horizontal dipole antenna radiator.

3. The high-isolation parallel feed structure for a dual-polarized curved surface radiator according to claim 2, characterized in that: Both the horizontal dipole antenna radiator and the vertical dipole antenna radiator include two symmetrically arranged radiating arms, each radiating arm having a curved surface structure and a feeding gap between the two radiating arms. The two radiating arms of the horizontal dipole antenna radiator are respectively the left and right ends of its two radiating arms. The two radiating arms of the vertical dipole antenna radiator have their upper and lower ends facing each other, respectively.

4. The high-isolation parallel feed structure for a dual-polarized curved surface radiator according to claim 3, characterized in that: The first shielded gradient double-line balun includes a first upper layer, a first middle layer, and a first lower layer; The first middle layer is disposed between two dielectric substrates, namely a first dielectric substrate and a second dielectric substrate, the first upper layer is disposed on the upper surface of the first dielectric substrate, and the first lower layer is disposed on the lower surface of the second dielectric substrate. The first middle layer is located between the first upper layer and the first lower layer, and the first upper layer, the first middle layer, and the first lower layer are parallel to each other; The first upper layer and the first lower layer are shielding grounding layers, and the first middle layer is a transmission layer.

5. The high-isolation parallel feed structure for a dual-polarized curved surface radiator according to claim 4, characterized in that: Both the first upper layer and the first lower layer are metal layers, and they are interconnected by metallized vias.

6. The high-isolation parallel feed structure for a dual-polarized curved surface radiator according to claim 4, characterized in that: The positive pole of the torsion structure is connected to the upper end of the vertical dipole antenna radiator, and the negative pole of the torsion structure is connected to the lower end of the vertical dipole antenna radiator.

7. The high-isolation parallel feed structure for a dual-polarized curved surface radiator according to claim 6, characterized in that: The positive electrode of the torsion structure includes a first upper metal sheet, a middle metal sheet, and a first lower metal sheet arranged sequentially at intervals. The first upper metal sheet, the middle metal sheet, and the first lower metal sheet are interconnected through a first metallized through-hole. The exposed first upper metal sheet and the first lower metal sheet are connected to the upper end of the vertical dipole antenna radiator. The middle layer metal sheet and the first middle layer are integrally formed as a continuous metal conductor strip; The first middle layer includes gradient lines, strip lines, and microstrip lines; The first middle layer gradually increases in line width from the end connected to the middle layer metal sheet. This segment is the gradient line, used to achieve broadband impedance matching. After the line width increases to a preset value, it enters a constant width segment, which is the strip line. The end of the strip line extends to the RF connector, where it transforms from the strip line into the microstrip line. The negative electrode of the torsion structure includes a second upper metal sheet and a second lower metal sheet arranged at intervals, and the second upper metal sheet and the second lower metal sheet are interconnected through a second metallized through hole; the exposed second upper metal sheet and the second lower metal sheet are connected to the lower end of the vertical dipole antenna radiator; The second upper metal sheet and the first upper layer are integrally formed as a continuous metal strip, and the second lower metal sheet and the first lower layer are integrally formed as a continuous metal strip.

8. The high-isolation parallel feed structure for a dual-polarized curved surface radiator according to claim 4, characterized in that: The structure of the second shielded gradient double-line balun is the same as that of the first shielded gradient double-line balun; The second shielded gradient double-line balun includes a second upper layer, a second middle layer, and a second lower layer. The second middle layer is located between the second upper layer and the second lower layer, and the three layers are parallel to each other.

9. The high-isolation parallel feed structure for a dual-polarized curved surface radiator according to claim 8, characterized in that: The positive pole of the balanced bipolar structure is connected to the left end of the horizontal dipole antenna radiator, and the negative pole of the balanced bipolar structure is connected to the right end of the horizontal dipole antenna radiator.

10. The high-isolation parallel feed structure for a dual-polarized curved surface radiator according to claim 9, characterized in that: The positive electrode of the balanced double-wire structure and the second middle layer are integrally formed continuous metal conductive strips; The second middle layer includes gradient lines, strip lines, and microstrip lines; The second middle layer gradually increases in line width from the end connected to the positive electrode of the balanced bipolar structure. This section is the gradient line, used to achieve broadband impedance matching. After the line width increases to a preset value, it enters a constant width section, which is the stripline. The end of the stripline extends to the RF connector, where it transforms from the stripline into the microstrip line. The negative electrode of the balanced bilinear structure includes a third upper metal sheet and a third lower metal sheet arranged at intervals, and the third upper metal sheet and the third lower metal sheet are interconnected through a third metallized through-hole. The third upper metal sheet and the second upper layer are integrally formed as a continuous metal strip, and the third lower metal sheet and the second lower layer are integrally formed as a continuous metal strip.

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