Modular high-gain circularly polarized vivaldi array antenna

Abstract

The application discloses a modular high-gain circularly polarized Vivaldi array antenna, which comprises edge antennas, middle antennas and a mounting base; the mounting base comprises a square metal plate printed with a feeding layer, four edge antennas and / or middle antennas are inserted into the square metal plate, and two edge antennas and / or middle antennas form an X-direction plane and a Y-direction plane perpendicular to each other, and a feeding seat is arranged in the center of the square metal plate; the edge antennas and the middle antennas are in a sheet structure and are composed of a bottom insertion structure and a top antenna structure, the bottom insertion structure comprises an insertion column and a wiring passage; a feeding balun is connected to a feeding source, and then the edge antennas and / or middle antennas in the same plane are connected to each other through the wiring passage to form Vivaldi antennas; the mounting base arrays are arranged to mount the antennas to form a Vivaldi array antenna, and the edge antennas are all edge antennas, and the other antennas are all middle antennas. The application can realize a modular circularly polarized Vivaldi array antenna, has a compact structure, and has strong antenna gain and expansibility.

Description

Technical Field

[0001] This application relates to the field of satellite communication antenna technology, specifically to a modular high-gain circularly polarized Vivaldi array antenna. Background Technology

[0002] In recent years, with the rapid development of satellite communication technology, the performance requirements for antenna systems have become increasingly stringent. Satellite communication scenarios place numerous demands on antenna performance, including ultra-wideband characteristics for multi-band compatibility, high gain to compensate for long-distance transmission losses, wide-angle scanning capabilities for dynamic beam pointing adjustment, and miniaturization to adapt to space-constrained scenarios such as low-Earth orbit satellites and unmanned aerial vehicle platforms. Traditional parabolic antennas or microstrip arrays, due to their large size, narrow bandwidth, and limited scanning range, are unable to meet the needs of next-generation satellite communication systems. Meanwhile, Vivaldi antennas based on the gradient groove principle have become a research hotspot due to their unique structural advantages.

[0003] The Vivaldi antenna is an end-fire traveling-wave antenna whose exponentially tapered slot structure enables ultra-wideband operation and features low cross-polarization. Through array optimization design, the Vivaldi antenna can further extend its bandwidth and achieve beam scanning capabilities. However, in satellite communication applications, conventional Vivaldi array antennas face several challenges: First, during wide-angle scanning, mutual coupling between the array antennas leads to impedance mismatch, resulting in decreased gain and radiation efficiency; second, the circular design makes it difficult to balance miniaturization and structural reliability, resulting in complex array structure design and difficult maintenance; third, antenna products have limitations and are prone to performance bottlenecks. Summary of the Invention

[0004] The purpose of this application is to overcome the shortcomings of the prior art and provide a modular high-gain circularly polarized Vivaldi array antenna that can realize a compact circularly polarized Vivaldi array antenna structure design, and the Vivaldi array antenna has strong antenna gain and scalability.

[0005] Firstly, this application provides a modular high-gain circularly polarized Vivaldi array antenna, which adopts the following technical solution:

[0006] The Vivaldi array antenna includes edge antennas, a center antenna, and a mounting base;

[0007] The mounting base includes a square metal plate with a feed layer printed on it. Four edge antennas and / or central antennas are inserted along the center lines of the four sides of the square metal plate. The edge antennas and / or central antennas on opposite sides are located on the same plane, forming an X-plane and a Y-plane in pairs. The X-plane and Y-plane are perpendicular to each other. A feed seat is provided in the center of the square metal plate, and a feed source connecting the edge antennas or the central antenna is provided in the feed seat.

[0008] The edge antenna and the middle antenna are sheet-like structures, consisting of a bottom plug-in structure and a top antenna structure. The bottom plug-in structure includes plug-in posts for plugging into the mounting base and wiring paths. The feed balun is connected to the feed source, and then the edge antenna and / or the middle antenna, which are in the same X-plane or Y-plane, are interconnected through horizontally arranged wiring paths to form a Vivaldi antenna.

[0009] An array of mounting bases with edge antennas and center antennas is arranged to form a Vivaldi array antenna. For a Vivaldi array antenna, the antennas at the edges are all edge antennas, and the other antennas are all center antennas.

[0010] By adopting the above technical solution, two sets of mutually perpendicular dual-polarized Vivaldi antennas are formed by mounting the edge antennas and / or the central antennas on the mounting base, thereby achieving circular polarization of the transmitted signal. The edge antennas and / or the central antennas are located on the four sides of the mounting base. When forming a Vivaldi array antenna, adjacent Vivaldi antennas share a central antenna, resulting in a compact structure that facilitates antenna miniaturization. For any Vivaldi antenna, it shares a central antenna with at most one adjacent Vivaldi antenna, which reduces the mutual coupling between antennas, effectively enhancing the gain of the Vivaldi array antenna, while reducing the cross-polarization components in the dual-polarized array and improving polarization purity.

[0011] Preferably, the top antenna structure of the edge antenna includes a gradient groove line facing the vertical line of the center of the mounting base, and the top antenna structure of the middle antenna includes two gradient groove lines symmetrical about the center line of the middle antenna. The two oppositely arranged gradient groove lines on the same X-plane or Y-plane form a gradient groove.

[0012] Preferably, the top antenna structure of the edge antenna also includes an antenna modification structure facing outwards from the mounting base.

[0013] By adopting the above technical solution, any combination of the edge antenna and / or the top antenna of the middle antenna can form a gradient groove as the transmitting arm of the Vivaldi antenna, providing conditions for modular assembly; the modified antenna structure of the edge antenna can extend the current path of the edge element, improve the impedance matching of the antenna, and enhance the wide-angle scanning performance.

[0014] Preferably, the wiring path of the bottom plug-in structure is provided with a mating hole facing the vertical line of the center of the mounting base, and the mating holes in the X-plane or Y-plane are located at the same horizontal height, but the horizontal heights of the mating holes in the X-plane and the Y-plane are different.

[0015] The above technical solution ensures that when edge antennas and / or middle antennas on the same plane are connected through a feed balun, the circuit paths remain in a unified plane. The circuit paths in the X-plane and the Y-plane have a height difference and can intersect, so that Vivaldi antennas with mutually perpendicular X-plane and Y-plane do not interfere with each other.

[0016] Preferably, the bottom plug-in structure has a resonant cavity slot facing the feed seat, and the resonant cavity slots in the X-plane or Y-plane are arranged opposite each other to form a resonant cavity.

[0017] The above scheme provides a structural design for the resonant cavity of the Vivaldi antenna, which can improve the energy transmission efficiency in the high-frequency band and suppress surface waves and stray radiation.

[0018] Preferably, the mounting base includes a base sidewall, and a slot is provided in the middle of the base sidewall, and the bottom insertion structure is slidably inserted into the slot.

[0019] Preferably, the bottom of the central antenna is provided with a bridging groove along its centerline direction. For any one of the central antennas, its bottom insertion structure is respectively inserted into the slots on the sidewalls of the bases of two adjacent mounting bases, and is bridging the upper part of the sidewalls of the bases through the bridging groove.

[0020] The above technical solution, by setting up the base sidewalls and creating slots on them, provides guidance and support for the installation of the edge antennas and the central antenna, improving the ease of assembly and enhancing structural strength and reliability. The central antenna spans the base sidewalls of two adjacent mounting bases, enabling the construction of dual-sided Vivaldi antennas, improving space utilization, and making the Vivaldi array antenna structure compact.

[0021] Preferably, the base sidewall is provided with a metal coupling plate.

[0022] The above technical solution effectively extends the resonant current through the metal coupling plate, thereby removing the low-frequency resonance from the operating frequency and improving the low-frequency impedance matching.

[0023] Preferably, the outer surface of the base sidewall is provided with a connection structure for cooperating with the adjacent base sidewall.

[0024] The above technical solution enables the arraying of mounting bases and ensures a tight connection between each mounting base, preventing relative displacement.

[0025] Preferably, the feed base has a cross structure, and the feed base is divided into mutually perpendicular X-arms and Y-arms according to the direction of the X-plane and the direction of the Y-plane. One end of the X-arm and the Y-arm is provided with a feed connection structure for feed installation.

[0026] With the above structure, a cross-shaped feed seat is built on the mounting base using the space below the bottom insertion structure of the edge antenna and the middle antenna. This provides the mounting position for the Vivaldi antennas in the X-plane and Y-plane, respectively, and makes full use of the space as much as possible without affecting the construction of the resonant cavity, while providing support for the edge antenna and the middle antenna.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. This application realizes the construction of a dual-polarized Vivaldi array antenna, which is compact, makes full use of space, and can reduce the size of the array antenna;

[0029] 2. This application constructs a Vivaldi antenna using a sheet-like edge antenna and / or a central antenna, which can reduce mutual coupling between antennas, enhance antenna gain, and improve wide-angle scanning performance through edge modification structure;

[0030] 3. The Vivaldi array antenna of this application has a simple structure, is easy to assemble and maintain, and has high structural reliability. It can achieve efficient modular assembly and can be easily expanded according to performance requirements, providing scalability. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a Vivaldi antenna unit consisting of four edge antennas in an embodiment of this application;

[0032] Figure 2 This is a top view of the mounting base 100 in an embodiment of this application;

[0033] Figure 3 This is a schematic diagram of the edge antenna 200 in the embodiments of this application;

[0034] Figure 4 This is a schematic diagram of the structure of the central antenna 300 in the embodiments of this application;

[0035] Figure 5 This is a schematic diagram of the X-direction Vivaldi array antenna structure in the embodiments of this application;

[0036] Figure 6 This is a schematic diagram of the 4*4 Vivaldi array antenna structure in the embodiments of this application;

[0037] Figure 7 This is a high-frequency 10GHz scanning pattern curve of the Vivaldi array antenna in the embodiments of this application;

[0038] Figure 8 This is a high-frequency 12GHz scanning pattern curve of the Vivaldi array antenna in the embodiments of this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] 100. Mounting base; 101. Square metal plate; 102. Base sidewall; 103. Feed source holder; 1031. Feed source; 104. Slot;

[0041] 200. Edge antenna; 201. Bottom plug-in structure; 2011. Plug-in post 2011; 2012. Wiring path; 2013. Resonant cavity slot; 202. Top antenna structure; 2021. Gradient groove line; 2022. Antenna modification structure; 210. X-direction edge antenna; 220. Y-direction edge antenna; 230. Feed line;

[0042] 300, Center antenna; 301, Gradient slot; 302, Bridging slot; 303, Feed balun; 310, X-direction center antenna; 320, Y-direction center antenna. Detailed Implementation

[0043] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of this application.

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It should be noted that in the optional embodiments of this application, the object information and other related data involved require the permission or consent of the object when the embodiments of this application are applied to specific products or technologies, and the collection, use, and processing of related data must comply with the relevant laws, regulations, and standards of the relevant countries and regions. That is to say, if the embodiments of this application involve data related to the object, it needs to be obtained with the authorization and consent of the object, the authorization and consent of the relevant departments, and in compliance with the relevant laws, regulations, and standards of the country and region. If personal information is involved in the embodiments, the acquisition of all personal information requires the consent of the individual. If sensitive information is involved, the separate consent of the information subject is required, and the embodiments also need to be implemented with the authorization and consent of the object.

[0045] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0046] The embodiments of this application will now be described in further detail with reference to the accompanying drawings.

[0047] Example 1:

[0048] First, please refer to Figures 1 to 3 The technical solution of this application is illustrated by taking the example of setting four edge antennas on a mounting base to form a Vivaldi antenna element.

[0049] like Figure 1 The mounting base 100 consists of a square metal plate 101 and base sidewalls 102, forming a box with an open top surface. This box is the basic module for modularly mounting Vivaldi antennas to form a Vivaldi array antenna. A feed layer is printed on the square metal plate 101. Slots 104 are provided in the center of each base sidewall 102 for antenna insertion. It should be noted that the square metal plate also has pre-drilled interfaces for antenna insertion, facilitating antenna positioning and installation. A metal coupling plate is located inside the base sidewalls 102, which extends the resonant current and improves the low-frequency bandwidth.

[0050] like Figure 2 A feed base 103 is provided in the center of a square metal plate 101. A feed source for connecting an edge antenna or a center antenna is provided inside the feed base. The cross-section of the feed base in the top view direction is cross-shaped and consists of an X-arm and a Y-arm. The X-arm and the Y-arm are perpendicular to each other and are arranged along the center lines of each side of the square metal plate 101. One end of the X-arm and the Y-arm is provided with a feed connection structure for feed source installation. The feed source is connected to the antenna.

[0051] like Figure 3 The edge antenna 200 consists of a bottom insertion structure 201 and a top antenna structure 202. The bottom insertion structure 201 includes a vertically arranged insertion post 2011 and a horizontally arranged wiring path 2012. The insertion post 2011 is slidably snapped into the slot 104 and connected to a square metal plate through an insertion interface to achieve antenna installation and fixation. The wiring path 2012 is used to connect the feed line 230, set the feed balun, and connect to the feed source. The wiring path 2012 has mating holes facing the vertical line of the center of the mounting base. The mating holes of antennas on the same plane are located at the same horizontal height, while the mating holes of antennas on different planes are at different horizontal heights, allowing feed lines 230 of different directions to pass through alternately without interference. The insertion post 2011 and the wiring path 2012 form a resonant cavity slot 2013. The height of the resonant cavity slot 2013 is the same as the height of the feed source base 103, so that the feed source base 103 can support the antenna. The top antenna structure 202 includes a tapered groove line 2021 and an antenna modification structure 2022. The antenna modification structure 2022 alters the resonant current path at the antenna edge, thus extending the resonant current and improving the low-frequency bandwidth.

[0052] In this embodiment, two X-direction edge antennas 210 form an X-direction Vivaldi antenna, and two Y-direction edge antennas 220 form a Y-direction Vivaldi antenna. The gradient slot lines 2021 on both sides of the same Vivaldi antenna constitute the gradient slot of the Vivaldi antenna, and the resonant cavity slots 2013 on both sides of the same antenna constitute the resonant cavity of the Vivaldi antenna. The resonant cavity can improve impedance matching and enhance energy transmission efficiency. The X-direction Vivaldi antenna and the Y-direction Vivaldi antenna form a dual-polarized antenna composed of two orthogonal polarization units. When the electromagnetic wave electric field radiated by the dual-polarized antenna has equal feed amplitude and a feed phase difference of 90° (right-hand circular polarization) or 270° (left-hand circular polarization), the projection of the terminal trajectory of its composite electric field vector onto the plane perpendicular to the propagation direction is circular, forming a circularly polarized wave.

[0053] It should be noted that, in the embodiments, the metal coupling plate and the antenna modification structure 2022 serve to extend the resonant current and improve the low-frequency bandwidth; the resonant cavity formed by the resonant cavity slot 2013 can improve impedance matching. In the embodiments of this application, the antenna modification structure 2022 uses a second gradient line to form a second gradient line slot, and the resonant cavity slot 2013 is a Γ-shaped slot, thus forming a rectangular resonant slot. The above technical features are not intended to limit the technical solution of this application. Those skilled in the art can adjust the structure and size of the metal coupling plate, the shape of the antenna modification structure 2022, and the shape of the resonant cavity slot 2013 according to structural design requirements, antenna performance requirements, and experimental results. For example, the resonant cavity slot 2013 can form a circular or rhomboid resonant slot. Those skilled in the art should understand that modifications to the above technical features, or equivalent substitutions of the above technical features, do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solutions of the embodiments of this application.

[0054] More specifically, as one embodiment, a Vivaldi antenna element with its antenna installed has dimensions of 22mm*22mm*27.3mm and an antenna thickness of 1mm.

[0055] Example 2:

[0056] Based on Embodiment 1, this embodiment describes the technical solution of the Vivaldi array antenna of this application.

[0057] like Figure 4 and Figure 5 For two adjacent Vivaldi antenna elements, a central antenna 300 needs to be shared to make the array antenna structure compact, space utilization high, and achieve equipment miniaturization. Figure 5 The diagram shows the structure of the X-direction Vivaldi array antenna. The structure of the Y-direction Vivaldi array antenna is the same.

[0058] The top antenna structure of the central antenna 300 has gradient groove lines 2021 on both sides, identical to those of the edge antennas, forming gradient grooves 301 with adjacent edge antennas and / or central antennas. The feed balun 303 connects to the feed 1031 in the feed mount 103, and connects to adjacent edge antennas 200 and central antennas 300, or two central antennas 300, forming a Vivaldi antenna. The feed mount 103 simultaneously supports both the edge antennas 200 and the central antennas 300.

[0059] Since adjacent Vivaldi antenna elements share a central antenna 300, the bottom insertion structure of the central antenna 300 is inserted into the slots of the two adjacent base sidewalls 102 respectively. The bottom of the central antenna 300 is provided with a bridging slot 302 along its centerline direction, and is bridging the base sidewall 102 above through the bridging slot 302.

[0060] It should be noted that in this embodiment, adjacent Vivaldi antenna elements adopt a close-fitting structural design to compress the space of the array antenna as much as possible. In this case, the outer surface of the base sidewall 102 is provided with a connection structure to cooperate with the adjacent base sidewall, so as to realize the array arrangement of the mounting bases and ensure that the connection between each mounting base is tight, preventing relative displacement and improving the stability of the system. In other embodiments, based on the requirements of space utilization, antenna circuit design, and antenna performance parameters, the Vivaldi antenna elements are also spaced at certain intervals, and the width of the bridging slot 302 of the middle antenna 300 needs to be adjusted accordingly according to the actual design requirements. In the case of spaced arrangement, a corresponding connection structure can be designed on the outer wall of the base sidewall 102, or the connection structure can be omitted.

[0061] It should be noted that in conventional designs using a cross-shaped array antenna, each side shares a central antenna with three adjacent Vivaldi antennas. For the central antenna, both sides share a total of six Vivaldi antennas, resulting in severe mutual coupling. This leads to deteriorated cross-polarization and impedance mismatch, causing efficiency loss and gain reduction. In contrast, the technical solution of this application employs a sheet-like antenna design, ensuring that for any Vivaldi antenna element, each side shares a central antenna with at most one adjacent Vivaldi antenna. This minimizes mutual coupling between adjacent Vivaldi antennas, reducing impedance mismatch and reflection loss, thereby improving effective gain. Furthermore, in the embodiments of this application, when any Vivaldi antenna element fails and requires maintenance or replacement of the edge or central antennas, only the affected element and one adjacent Vivaldi antenna element are affected. The structural design is simple, and maintenance is convenient and efficient. When it is necessary to expand the Vivaldi array antenna based on performance requirements, the number of Vivaldi antenna elements can be easily increased, and then the various edge antennas and / or the central antenna can be plugged in, and the electrical connection of the feed line can be made.

[0062] Example 3:

[0063] like Figure 6In this embodiment, 16 Vivaldi antenna elements form a 4*4 Vivaldi array antenna, with a spacing of 13mm between the Vivaldi antenna elements. The X-direction edge antenna 210 and the X-direction center antenna 310, along with two X-direction center antennas 310, form the X-direction Vivaldi antenna; the Y-direction edge antenna 220 and the Y-direction center antenna 320, along with two Y-direction center antennas 320, form the Y-direction Vivaldi antenna.

[0064] The Vivaldi array antenna operates with a bandwidth of 2.5 GHz to 12 GHz.

[0065] Please see Figure 7 The high-frequency 10GHz scanning pattern curve of the Vivaldi array antenna in this embodiment clearly shows that when the scanning angle reaches 60°, the antenna gain is still higher than 10dB.

[0066] Please see Figure 8 The high-frequency 12GHz scanning pattern curve of the Vivaldi array antenna in this embodiment clearly shows that when the scanning angle reaches 60°, the antenna gain is still higher than 10dB.

[0067] As can be seen from the above embodiments, the technical solution of this application can ensure high antenna gain while performing wide-angle scanning. Furthermore, the technical solution of this application realizes modular assembly of circularly polarized Vivaldi array antennas, which has broad application prospects in the field of satellite antennas.

[0068] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0069] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A modular high-gain circularly polarized Vivaldi array antenna, characterized in that: Includes edge antennas, center antennas, and mounting base; The mounting base includes a square metal plate with a feed layer printed on it. Four edge antennas and / or central antennas are inserted along the center lines of the four sides of the square metal plate. The edge antennas and / or central antennas on opposite sides are located on the same plane, forming an X-plane and a Y-plane in pairs. The X-plane and Y-plane are perpendicular to each other. A feed seat is provided in the center of the square metal plate, and a feed source connecting the edge antennas or the central antenna is provided in the feed seat. The edge antenna and the middle antenna are sheet-like structures, consisting of a bottom plug-in structure and a top antenna structure. The bottom plug-in structure includes plug-in posts for insertion into the mounting base and wiring paths. A feed balun is connected to a feed source, and then the edge antenna and / or the middle antenna, which are located in the same X-plane or Y-plane, are interconnected through horizontally arranged wiring paths to form a Vivaldi antenna. The bottom plug-in structure has resonant cavity slots facing the feed source base, and the resonant cavity slots in the X-plane or Y-plane are arranged opposite each other to form a resonant cavity. The mounting base array, which is equipped with edge antennas and center antennas, is arranged to form a Vivaldi array antenna. For the Vivaldi array antenna, the antennas at the edges are all edge antennas, and the other antennas are all center antennas. The top antenna structure of the edge antenna includes a gradient groove line facing the vertical line of the center of the mounting base, and the top antenna structure of the middle antenna includes two gradient groove lines symmetrical about the center line of the middle antenna. Two oppositely arranged gradient groove lines on the same X-plane or Y-plane form a gradient groove. The feed base has a cross-shaped cross section when viewed from above. The feed base is divided into mutually perpendicular X-arms and Y-arms according to the X-plane and Y-plane directions. One end of the X-arm and Y-arm is provided with a feed connection structure for feed installation.

2. The modular high-gain circularly polarized Vivaldi array antenna according to claim 1, characterized in that: The top antenna structure of the edge antenna also includes an antenna modification structure facing outwards from the mounting base.

3. The modular high-gain circularly polarized Vivaldi array antenna according to claim 1, characterized in that: The wiring path of the bottom plug-in structure is provided with a docking hole facing the vertical line of the center of the mounting base. The docking holes in the X-plane or Y-plane are located at the same horizontal height, but the horizontal heights of the docking holes in the X-plane and the Y-plane are different.

4. The modular high-gain circularly polarized Vivaldi array antenna according to claim 1, characterized in that: The mounting base includes a base sidewall, and a slot is provided in the middle of the base sidewall. The bottom insertion structure is slidably inserted into the slot.

5. The modular high-gain circularly polarized Vivaldi array antenna according to claim 4, characterized in that: The bottom of the central antenna is provided with a bridging slot along its centerline direction. For any one of the central antennas, its bottom insertion structure is inserted into the slots on the side walls of the bases of two adjacent mounting bases, and is bridging the upper part of the base side walls through the bridging slot.

6. The modular high-gain circularly polarized Vivaldi array antenna according to claim 4, characterized in that: The base sidewall is provided with a metal coupling plate.

7. The modular high-gain circularly polarized Vivaldi array antenna according to claim 4, characterized in that: The outer side of the base sidewall is provided with a connection structure for cooperating with the adjacent base sidewall.

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