Modular high-gain circularly polarized Vivaldi array antenna

Abstract

The invention discloses a modular high-gain circularly polarized Vivaldi array antenna. The modular high-gain circularly polarized Vivaldi array antenna comprises an edge antenna, a middle antenna and a mounting base, the mounting base comprises a square metal plate printed with a feed layer, four edge antennas and / or middle antennas are inserted on the square metal plate, an X-direction plane and a Y-direction plane which are perpendicular to each other are formed in pairs, and a feed source seat is arranged in the center of the square metal plate; the edge antenna and the middle antenna are of a sheet-shaped structure and are composed of a bottom insertion structure and a top antenna structure, and the bottom insertion structure comprises an insertion column and a wiring path; the feed balun is connected with a feed source, and then the edge antennas and / or the middle antennas which are located on the same plane are connected with each other through a wiring path to form a Vivaldi antenna; the mounting bases for mounting the antennas are arranged in an array to form a Vivaldi array antenna, the antennas at the edges of the Vivaldi array antenna are edge antennas, and the other antennas are middle antennas. According to the invention, the modular circularly polarized Vivaldi array antenna can be realized, the structure is compact, and the antenna gain and expandability are relatively high.

Description

Technical Field

[0001] The present application relates to the technical field of satellite communication antennas, and in particular to a modular high-gain circularly polarized Vivaldi array antenna. Background Art

[0002] With the rapid development of satellite communication technology in recent years, 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 adjustments, and miniaturization to accommodate space-constrained scenarios such as low-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 requirements of the next generation of satellite communication systems. The Vivaldi antenna, based on the gradient slot principle, has become a research hotspot due to its unique structural advantages.

[0003] The Vivaldi antenna is an end-fire traveling-wave antenna whose exponentially tapered slotline structure enables ultra-wideband operation and low cross-polarization. Through array optimization design, the Vivaldi antenna can further expand bandwidth and achieve beam scanning capabilities. However, in satellite communication applications, the conventional Vivaldi array antenna faces multiple challenges: First, wide-angle scanning results in impedance mismatch due to mutual coupling between the array antennas, causing a decrease in gain and radiation efficiency; second, the circular design makes it difficult to balance the miniaturization and structural reliability of the array antenna, resulting in a relatively complex array structure design and difficult maintenance; third, the antenna product has limitations and is prone to performance bottlenecks. Summary of the Invention

[0004] The purpose of this application is to overcome the shortcomings of the existing technology and provide a modular high-gain circularly polarized Vivaldi array antenna that can achieve a compact circularly polarized Vivaldi array antenna structure design. The Vivaldi array antenna has strong antenna gain and is scalable.

[0005] In a first aspect, the present application provides a modular high-gain circularly polarized Vivaldi array antenna, which adopts the following technical solutions: The Vivaldi array antenna includes an edge antenna, a middle antenna, and a 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 respectively plugged in along the midline directions 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-direction plane and a Y-direction plane in pairs. The X-direction plane and the Y-direction plane are perpendicular to each other. A feed source seat is provided in the center of the square metal plate, and a feed source connected to the edge antenna or the central antenna is provided in the feed source 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 a plug-in post and a wiring path for plugging into the mounting base. The feed balun is connected to the feed source, and then the edge antenna and / or the middle antenna in the same X-direction plane or Y-direction plane are interconnected through horizontally arranged wiring paths to form a Vivaldi antenna. The mounting bases on which the edge antennas and the middle antennas are mounted are arranged in an array 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 middle antennas.

[0006] By adopting the above technical solution, sheet-shaped edge antennas and / or middle antennas are arranged on the mounting base, and are combined in pairs to form two groups of mutually perpendicular dual-polarized Vivaldi antennas, thereby realizing circular polarization of the radio wave signal; the edge antennas and / or middle antennas are located on the four sides of the mounting base. When forming a Vivaldi array antenna, adjacent Vivaldi antennas share a middle antenna, which has a compact structure and is conducive to the miniaturization of the antenna; for any Vivaldi antenna, it only shares a middle antenna with an adjacent Vivaldi antenna at most, which can reduce the mutual coupling between the antennas, so that the gain of the Vivaldi array antenna is effectively enhanced, while reducing the cross-polarization component in the dual-polarization array and improving the polarization purity.

[0007] Preferably, the top antenna structure of the edge antenna includes a gradient slot line toward the center vertical line of the mounting base, and the top antenna structure of the middle antenna includes two gradient slot lines symmetrical about the center line of the middle antenna, and the two oppositely arranged gradient slot lines in the same X-direction plane or Y-direction plane form a gradient slot.

[0008] Preferably, the top antenna structure of the edge antenna further includes an antenna modification structure facing the outside of the mounting base.

[0009] By adopting the above technical solution, any combination of edge antennas and / or top antennas of the middle antenna can form a gradient slot as a Vivaldi antenna transmitting arm, providing conditions for modular assembly; the antenna modification structure of the edge antenna can extend the edge unit current path, improve the impedance matching of the antenna, and enhance the wide-angle scanning performance.

[0010] Preferably, the wiring passage 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-direction plane or the Y-direction plane are located at the same horizontal height, and the docking holes in the X-direction plane and the docking holes in the Y-direction plane are at different horizontal heights.

[0011] Through the above technical solution, when the edge antennas and / or middle antennas in the same plane are connected through the feed balun, the line path maintains a unified plane, and the line path in the X-direction plane and the line path in the Y-direction plane have a height difference and can pass through each other, so that there is no interference between the Vivaldi antennas with mutually perpendicular X-direction planes and Y-direction planes.

[0012] Preferably, the bottom plug-in structure is provided with a resonant cavity slot facing the feed seat, and the resonant cavity slots in the X-direction plane or the Y-direction plane are arranged relative to each other to form a resonant cavity.

[0013] Through the above solution, a structural design of the resonant cavity of the Vivaldi antenna is provided, which can improve the energy transmission efficiency in the high-frequency band and suppress surface waves and stray radiation.

[0014] Preferably, the mounting base includes a base side wall, a card slot is provided in the middle of the base side wall, and the bottom plug-in structure can be slidably plugged into the card slot.

[0015] Preferably, a jumper groove is provided at the bottom of the middle antenna along its midline direction. For any one of the middle antennas, its bottom plug-in structure is respectively plugged into the slots of the base side walls of two adjacent installed bases, and is bridged above the base side walls through the jumper groove.

[0016] The above technical solution, through the provision of base sidewalls and slots therein, provides guidance and support for the installation of edge antennas and central antennas, improving assembly convenience and enhancing structural strength and reliability. The central antenna, which straddles the sidewalls of two adjacent bases, enables the construction of a dual-sided Vivaldi antenna, improving space utilization and making the Vivaldi array antenna compact.

[0017] Preferably, a metal coupling plate is provided inside the side wall of the base.

[0018] Through the above technical solution, the resonant current can be effectively extended through the metal coupling plate, thereby removing the low-frequency resonance from the operating frequency and improving the low-frequency impedance matching.

[0019] Preferably, the outer side surface of the base side wall is provided with a connection structure for cooperating with the adjacent base side wall.

[0020] Through the above technical solution, it is possible to achieve an array arrangement of the mounting bases, and ensure that the connections between the mounting bases are tight and no relative displacement occurs.

[0021] Preferably, the feed base is a cross structure, and the feed base is divided into mutually perpendicular X-axis arms and Y-axis arms according to the directions of the X-axis plane and the Y-axis plane, and one end of the X-axis arm and the Y-axis arm is provided with a feed connection structure for feed installation.

[0022] Through the above structure, a cross-shaped feed seat is established on the mounting base by utilizing the space below the bottom plug-in structure of the edge antenna and the middle antenna, providing installation positions for the feed sources of the Vivaldi antennas in the X-plane and the Y-plane respectively, and making full use of the space as much as possible without affecting the construction of the resonant cavity, and being able to provide support for the edge antenna and the middle antenna.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. This application realizes the construction of a dual-polarized Vivaldi array antenna with a compact structure, fully utilizing space and reducing the size of the array antenna; 2. This application constructs a Vivaldi antenna using sheet-like edge antennas and / or central antennas, which can reduce mutual coupling between antennas, enhance antenna gain, and enhance wide-angle scanning performance through edge modification structures. 3. The Vivaldi array antenna of the present application has a simple structure, is easy to assemble, easy to maintain, and has strong structural reliability. It can achieve efficient modular assembly and can conveniently expand the structure of the Vivaldi array antenna according to performance requirements, providing expandable space. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of a Vivaldi antenna unit composed of four edge antennas in an embodiment of the present application; Figure 2 Schematic top view of the mounting base 100 in the embodiment of the present application; Figure 3 This is a schematic structural diagram of an edge antenna 200 in an embodiment of the present application; Figure 4 Schematic diagram of the structure of the middle antenna 300 in the embodiment of the present application; Figure 5 Schematic diagram of the X-directional Vivaldi array antenna structure in an embodiment of the present application; Figure 6 This is a schematic diagram of the 4*4 Vivaldi array antenna structure in an embodiment of the present application; Figure 710 GHz high-frequency scanning pattern curve of the Vivaldi array antenna in the embodiment of the present application; Figure 8 This is a graph showing the scanning pattern of the Vivaldi array antenna at a high frequency of 12 GHz in an embodiment of the present application.

[0025] Description of reference numerals: 100, mounting base; 101, square metal plate; 102, base side wall; 103, feed base; 1031, feed; 104, slot; 200, edge antenna; 201, bottom plug-in structure; 2011, plug-in column 2011; 2012, wiring path; 2013, resonant cavity slot; 202, top antenna structure; 2021, gradient slot line; 2022, antenna modification structure; 210, X-direction edge antenna; 220, Y-direction edge antenna; 230, feeder circuit; 300, central antenna; 301, gradient slot; 302, jumper slot; 303, feeder balun; 310, X-direction central antenna; 320, Y-direction central antenna. DETAILED DESCRIPTION

[0026] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the present application, they are protected by patent law.

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. It should be noted that in the optional embodiments of the present application, when the embodiments in the present application are applied to specific products or technologies, the object information and other related data involved need to obtain the object's permission or consent, and the collection, use and processing of the relevant data need to comply with the relevant laws, regulations and standards of the relevant countries and regions. In other words, if the embodiments of the present application involve data related to the object, it needs to be obtained through 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 needs to be obtained. The embodiments also need to be implemented with the authorization and consent of the object.

[0028] In this document, the term "and / or" simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document, unless otherwise specified, generally indicates an "or" relationship between the related objects.

[0029] The embodiments of the present application are described in further detail below with reference to the accompanying drawings.

[0030] Example 1: First, see Figures 1 to 3 , taking the arrangement of four edge antennas on a mounting base to form a Vivaldi antenna unit as an example, the technical solution of the present application is explained.

[0031] like Figure 1 The mounting base 100 is composed of a square metal plate 101 and a base side wall 102, forming a box body with an open top surface. The box body is the basic module for installing a modular Vivaldi antenna to form a Vivaldi array antenna. A feeding layer is printed on the square metal plate 101. A card slot 104 is provided in the middle of each base side wall 102 for the antenna to be plugged in. It should be noted that a plug-in interface for the antenna to be plugged in is also reserved on the square metal plate, which facilitates the positioning and installation of the antenna. A metal coupling plate is provided inside the base side wall 102 to extend the resonant current and improve the low-frequency bandwidth.

[0032] like Figure 2 A feed base 103 is provided in the center of the square metal plate 101, and a feed connected to the edge antenna or the middle antenna is provided in the feed base; the cross-section of the feed base in the top view direction is a cross, and is composed of an X-direction arm and a Y-direction arm. The X-direction arm and the Y-direction arm are perpendicular to each other and are arranged along the center line of each side of the square metal plate 101. One end of the X-direction arm and the Y-direction arm is provided with a feed connection structure for feed installation, and the feed is connected to the antenna.

[0033] like Figure 3The edge antenna 200 consists of a bottom plug-in structure 201 and a top antenna structure 202. The bottom plug-in structure 201 includes a vertically arranged plug-in column 2011 and a horizontally arranged wiring path 2012. The plug-in column 2011 can be slidably engaged in the card slot 104 and connected to the square metal plate through the plug interface to achieve the installation and fixation of the antenna. 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 is provided with a docking hole facing the vertical line of the center of the mounting base. The docking holes of antennas in the same plane are at the same horizontal height, and the docking holes of antennas in different planes are at different horizontal heights, so that feed lines 230 in different directions can pass through each other without interference. The plug-in column 2011 and the wiring path 2012 form a resonant cavity slot 2013. The height of the resonant cavity slot 2013 is consistent with the height of the feed base 103, so that the feed base 103 can support the antenna. The top antenna structure 202 includes a tapered slot line 2021 and an antenna modification structure 2022. The antenna modification structure 2022 changes the resonant current path at the antenna edge, also extending the resonant current and improving the low-frequency bandwidth.

[0034] 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 tapered slot lines 2021 on either side of a Vivaldi antenna form the antenna's tapered slot, and the resonant cavity slots 2013 on either side of the same antenna form the antenna's resonant cavity. The resonant cavity improves impedance matching and enhances energy transmission efficiency. The X-direction Vivaldi antenna and the Y-direction Vivaldi antenna form a dual-polarization antenna composed of two orthogonal polarization units. When the electric field of the electromagnetic wave radiated by the dual-polarization antenna is fed with equal amplitudes and a feeding phase difference of 90° (right-hand circular polarization) or 270° (left-hand circular polarization), the projection of the terminal trajectory of the composite electric field vector onto a plane perpendicular to the propagation direction is circular, forming a circularly polarized wave.

[0035] It should be noted that in the embodiments, the metal coupling plate and antenna modification structure 2022 extend the resonant current and improve the low-frequency bandwidth; the resonant cavity formed by the resonant cavity slot 2013 improves impedance matching. In the embodiments of the present application, the antenna modification structure 2022 uses a second tapered line to form a second tapered slot, and the resonant cavity slot 2013 is a Γ-shaped slot, thus forming a rectangular resonant slot. The above technical features are not limitations of the technical solutions of this application. Those skilled in the art may adjust the structure and dimensions of the metal coupling plate, the shape of the antenna modification structure 2022, and the shape of the resonant cavity slot 2013 based on structural design requirements, antenna performance requirements, and experimental results. For example, the resonant cavity slot 2013 may be used to form a circular or diamond-shaped resonant slot. Those skilled in the art should understand that modifications to the above technical features, or equivalent replacements for the above technical features, do not deviate from the essence of the corresponding technical solutions within the scope of the various embodiments of this application.

[0036] More specifically, as an embodiment, for a Vivaldi antenna unit after the antenna is installed, its size is 22mm*22mm*27.3mm, and the thickness of the antenna is 1mm.

[0037] Example 2: Based on Example 1, in this example, the technical solution of the Vivaldi array antenna of the present application is described.

[0038] like Figure 4 and Figure 5 Two adjacent Vivaldi antenna units need to share a middle antenna 300, so that the array antenna has a compact structure, high space utilization, and miniaturization of the device. Figure 5 Schematic diagram of the structure of the X-direction Vivaldi array antenna. The structure of the Y-direction Vivaldi array antenna is the same.

[0039] The top antenna structure of the central antenna 300 is flanked by tapered slot lines 2021, similar to those used for the edge antennas, forming a tapered slot 301 with adjacent edge antennas and / or central antennas. A feed balun 303 connects to the feed 1031 in the feed base 103 and connects adjacent edge antennas 200 and central antennas 300, or two central antennas 300, to form a Vivaldi antenna. The feed base 103 supports both the edge antennas 200 and the central antenna 300.

[0040] Since adjacent Vivaldi antenna units share a central antenna 300, the bottom plug-in structure of the central antenna 300 is respectively plugged into the slots of two adjacent base side walls 102. A jumper slot 302 is opened at the bottom of the central antenna 300 along its midline direction, and the central antenna 300 is bridged to the top of the base side wall 102 through the jumper slot 302.

[0041] It should be noted that in this embodiment, adjacent Vivaldi antenna units adopt a close-fitting structural design to compress the space of the array antenna as much as possible. In this case, the outer side surface of the base side wall 102 is provided with a connecting structure for cooperating with the adjacent base side wall to realize the array arrangement of the mounting bases and ensure that the connection between each mounting base is tight and no relative displacement occurs, thereby improving the stability of the system. In other embodiments, based on the requirements of space use, antenna line design requirements and antenna performance parameter requirements, the Vivaldi antenna units are also spaced apart with a certain gap, and the width of the jumper slot 302 of the middle antenna 300 needs to be adjusted accordingly according to the actual design requirements. In the case of a spaced arrangement, a corresponding connecting structure can be designed on the outer wall of the base side wall 102, or the connecting structure can be cancelled.

[0042] It should be noted that in conventional designs, a cross-shaped array antenna is used, and one side of the array antenna shares a middle antenna with three adjacent Vivaldi antennas. For the middle antenna, both sides of the array antenna share the middle antenna with a total of six Vivaldi antennas, resulting in severe mutual coupling, which will worsen cross-polarization and cause impedance adaptation, resulting in efficiency loss and gain reduction. In the technical solution of the present application, a sheet-shaped antenna is used, so that for any Vivaldi antenna unit, it only shares one middle antenna with an adjacent Vivaldi antenna on one side at most, minimizing the mutual coupling between adjacent Vivaldi antennas, minimizing impedance mismatch and reflection loss, and thus improving the effective gain. At the same time, for the embodiments of the present application, when any Vivaldi antenna unit fails and the edge antenna or the middle antenna needs to be maintained or replaced, it will only affect itself and an adjacent Vivaldi antenna unit. The structural design is simple, and maintenance is convenient and efficient. When the Vivaldi array antenna needs to be expanded based on performance requirements, the number of Vivaldi antenna units can be easily expanded, and then the edge antennas and / or central antennas can be plugged in and the feed lines can be electrically connected.

[0043] Example 3: like Figure 6In this implementation, 16 Vivaldi antenna elements form a 4x4 Vivaldi array antenna, with a spacing of 13 mm between the Vivaldi antenna elements. The X-direction edge antenna 210, the X-direction center antenna 310, and two X-direction center antennas 310 form the X-direction Vivaldi antenna. The Y-direction edge antenna 220, the Y-direction center antenna 320, and two Y-direction center antennas 320 form the Y-direction Vivaldi antenna.

[0044] The operating bandwidth of the Vivaldi array antenna is 2.5GHz-12GHz.

[0045] See also Figure 7 The scanning pattern curve of the high frequency 10 GHz of the Vivaldi array antenna of this embodiment shows that when the scanning angle reaches 60°, the antenna gain is still higher than 10 dB.

[0046] See also Figure 8 The scanning pattern curve of the high frequency 12 GHz of the Vivaldi array antenna of this embodiment shows that when the scanning angle reaches 60°, the antenna gain is still higher than 10 dB.

[0047] The above embodiments demonstrate that the present invention's technical solution can achieve high antenna gain while maintaining wide-angle scanning. Furthermore, the present invention's technical solution implements modular circularly polarized Vivaldi array antenna assembly, which has broad application prospects in the field of satellite antennas.

[0048] Unless otherwise defined, the technical or scientific terms used in this application shall have the usual meanings understood by persons of ordinary skill in the field to which this application belongs. The words "first", "second", "third" and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprises" cover the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A modular high-gain circularly polarized Vivaldi array antenna, characterized by: Includes edge antenna, mid-range antenna 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 respectively plugged in along the midline directions 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-direction plane and a Y-direction plane in pairs. The X-direction plane and the Y-direction plane are perpendicular to each other. A feed source seat is provided in the center of the square metal plate, and a feed source connected to the edge antenna or the central antenna is provided in the feed source 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 a plug-in post and a wiring path for plugging into the mounting base. The feed balun is connected to the feed source, and then the edge antenna and / or the middle antenna in the same X-direction plane or Y-direction plane are interconnected through horizontally arranged wiring paths to form a Vivaldi antenna. The mounting bases on which the edge antennas and the middle antennas are mounted are arranged in an array 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 middle antennas.

2. The modular high-gain circularly polarized Vivaldi array antenna according to claim 1, wherein: The top antenna structure of the edge antenna includes a tapered slot line facing the center vertical line of the mounting base, and the top antenna structure of the middle antenna includes two tapered slot lines symmetrical about the midline of the middle antenna. The two oppositely arranged tapered slot lines in the same X-direction plane or Y-direction plane form a tapered slot.

3. The modular high-gain circularly polarized Vivaldi array antenna according to claim 2, wherein: The top antenna structure of the edge antenna further includes an antenna modification structure facing the outside of the mounting base.

4. The modular high-gain circularly polarized Vivaldi array antenna according to claim 1, wherein: The wiring passage 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-direction plane or the Y-direction plane are located at the same horizontal height, and the docking holes in the X-direction plane and the docking holes in the Y-direction plane are at different horizontal heights.

5. The modular high-gain circularly polarized Vivaldi array antenna according to claim 1, wherein: The bottom plug-in structure is provided with a resonant cavity slot facing the feed seat, and the resonant cavity slots in the X-direction plane or the Y-direction plane are arranged opposite to each other to form a resonant cavity.

6. The modular high-gain circularly polarized Vivaldi array antenna according to claim 1, wherein: The mounting base includes a base side wall, a card slot is provided in the middle of the base side wall, and the bottom plug-in structure can be slidably plugged into the card slot.

7. The modular high-gain circularly polarized Vivaldi array antenna according to claim 6, characterized in that: A jumper slot is provided at the bottom of the middle antenna along its midline. For any one of the middle antennas, its bottom plug-in structure is respectively plugged into the slots on the side walls of the base of two adjacent installed bases, and is bridged above the side walls of the base through the jumper slot.

8. The modular high-gain circularly polarized Vivaldi array antenna according to claim 6, characterized in that: A metal coupling plate is provided inside the side wall of the base.

9. The modular high-gain circularly polarized Vivaldi array antenna according to claim 6, characterized in that: The outer side surface of the base side wall is provided with a connection structure for cooperating with the adjacent base side wall.

10. The modular high-gain circularly polarized Vivaldi array antenna according to claim 1, characterized in that: The cross-section of the feed base in the top view direction is cross-shaped, and the feed base is divided into mutually perpendicular X-axis arms and Y-axis arms according to the directions of the X-axis plane and the Y-axis plane. One end of the X-axis arm and the Y-axis arm is provided with a feed connection structure for feed installation.

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