EP4618312A1

EP4618312A1 - Antenna element unit, antenna radiation unit, and antenna array

Info

Publication number: EP4618312A1
Application number: EP23893819.5A
Authority: EP
Inventors: Dingshu JIN; Suidao FU; Chuangxin WANG; Yonglei LIU; Liang Liu; Lei Sun
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2022-11-24
Filing date: 2023-11-21
Publication date: 2025-09-17
Also published as: CN118073844A; WO2024109729A1; EP4618312A4

Abstract

Disclosed in embodiments of the present application are an antenna element unit, an antenna radiation unit, and an antenna array. The antenna element unit comprises a radiator, a balun short double wire, and a resonant assembly. The radiator is connected to a balun short double wire; the resonant assembly is embedded into the balun short double wire to form at least one order of resonant circuit having low-frequency stop-band and high-frequency pass-band characteristics; and each order of resonant circuit includes an equivalent capacitor structure and an equivalent inductor structure.

Description

CROSS REFERENCE TO RELATED APPLICATION

This application claims priority to Chinese Patent Application No. 202211479991.7 filed on November 24, 2022 , entitled "ANTENNA ELEMENT UNIT, ANTENNA RADIATION UNIT, AND ANTENNA ARRAY", the entirety of which is incorporated herein by reference.

TECHNICAL FIELD

The present application relates to the field of communication, and in particular to an antenna element, an antenna radiator and an array.

BACKGROUND

Base station antennas serve as an intermediate assembly for signal transmitting and receiving, which can convert guided waves propagated online and electromagnetic waves radiated in the space into each other as a converter. With development of base station antennas, the speed of processing a large amount of information is increased while the amount of information of mobile communication is increased. With the advent of the 5G era, high-end, high-tech base station antennas are used to replace traditional antennas and more and more new technologies will be applied to base station antennas. A multi-frequency multi-array may be used as a 5G base station antenna, with each array consisting of two or more antenna elements which are fed and spatially arranged according to certain requirements, and the structure of the multi-frequency multi-array is shown in FIG. 1. In order to reduce the cost of base station construction and leasing, multi-frequency common-aperture antennas become the main solution for macro base stations. However, development of multi-frequency common-aperture antennas faces many challenges, in which common-mode coupling between high-frequency and low-frequency antennas is a primary one. As shown in FIG. 2, a subarray consists of one low-frequency array 201 and four high-frequency arrays 202, between which the problem of common-mode coupling between high-frequency and low-frequency antennas exists.
In the related art, there are two solutions to suppress common-mode resonance between high-frequency and low-frequency antennas.

1) Common-mode low-impedance filter circuit design, in which a high-frequency antenna element feeding structure is provided with a low-impedance high-pass filter circuit capable of suppressing common-mode current to suppress low-frequency current on the high-frequency antenna. However, the aperture of a radiator is relatively large in this solution.
2) Floating-ground design of high-frequency and low-frequency arrays, in which a high-frequency array is floated and the reflective floor is grooved, so as to cut off the current path of the high-frequency antenna. However, the common-mode suppression capability of this solution is relatively low, and this solution is not suitable for PCB (Printed Circuit board) elements.

SUMMARY

In a first aspect, the present application provides an antenna element , which includes a radiator, a balun short double wire, and a resonant assembly; wherein the radiator is electrically connected to the balun short double wire; the resonant assembly is embedded into the balun short double wire to form at least one order of resonant circuit having low-frequency stop-band and high-frequency pass-band characteristics; and each order of resonant circuit includes an equivalent capacitor structure and an equivalent inductor structure.
In a second aspect, the present application provides an antenna element, which includes a director, a support, and an antenna element according to the first aspect, wherein the support is configured to connect the director with the antenna element.
In a third aspect, the present application provides an array, which includes a feeding network, and at least two antenna radiator according to the second aspect, each of the antenna radiator is electrically connected to the feeding network according to a set array structure, and a dimension of a radiator in each of the antenna radiator is configured according to a set radiation frequency band.

BRIEF DESCRIPTION OF DRAWINGS

The drawings illustrated here are used to provide further understanding of the present application and constitute a part thereof, the illustrative embodiments and descriptions thereof in the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

FIG. 1 is a schematic structural diagram of a multi-frequency multi-array provided by the present application.
FIG. 2 is a schematic diagram of distribution of high-frequency and low-frequency antenna elements provided by the present application.
FIG. 3 is a schematic diagram of a principle of a problem of common-mode coupling problem between high-frequency and low-frequency antennas provided by one embodiment of the present application.
FIG. 4 is a schematic structural diagram of an antenna element provided by one embodiment of the present application.
FIG. 5 is a schematic structural diagram of a resonant assembly in an antenna element provided by one embodiment of the present application.
FIGS. 6a and 6b are a front side schematic structural diagram and a back side schematic structural diagram, respectively, of an antenna element provided by one embodiment of the present application.
FIG. 7 is a schematic structural diagram of a metal sheet in an EBG resonator provided by one embodiment of the present application.
FIG. 8 is a schematic structural diagram of a resonant assembly in an antenna element provided by one embodiment of the present application.
FIG. 9 is a schematic structural diagram of an antenna element provided by one embodiment of the present application.
FIG. 10 is a perspective schematic diagram of an antenna radiator provided by one embodiment of the present application.
FIG. 11 is a schematic structural diagram of an array provided by one embodiment of the present application.
FIG. 12 is a schematic diagram of a layout of an array provided by one embodiment of the present application.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the present application clearer, the technical solutions of the present application will be described clearly and thoroughly below with reference to the specific embodiments of the present application and the corresponding drawings. Obviously, the embodiments described herein are merely a part of the embodiments of the present application rather than all of them. All other embodiments obtained by a person skilled in the art without creative work based on embodiments in the present application shall fall within the scope of the present document.
The terms "first", "second", and the like in the description and in the claims of the application are used to distinguish between similar objects rather than describing a specific order or a sequence. It is to be understood that data used in such a way may be interchanged where appropriate, whereby embodiments of the application can be implemented in an order other than those illustrated or described herein. In addition, "and/or" in the description and claims indicates at least one of the objects connected therewith, and the character "/" generally indicates that the objects associated therewith are in an "or" relationship.
As mentioned above, there is a problem of common-mode coupling between high-frequency and low-frequency antennas in a multi-frequency common-aperture antenna. During the process of invention, the inventors find out the generation principle of the problem of common-mode coupling between high-frequency and low-frequency antennas, as shown in FIG. 3. Common-mode coupling between high-frequency and low-frequency antennas is caused by the fact that the balun assembly 302 and the radiator 301 of a high-frequency antenna constitute a low-frequency monopole antenna equivalently, which can be induced and excited by the low-frequency antenna 303, and the gain and bandwidth of the low-frequency antenna 303 are changed. Common-mode coupling is different from conventional differential-mode coupling and cannot be suppressed by simple filters or decoupling branches.
In view of this, the embodiments of the present application provide an antenna element, an antenna radiator and an array with common-mode current suppression, which can solve the problem of common-mode coupling between high-frequency and low-frequency antennas. The technical solution provided in the embodiments of the present application may be applied in 5G (5th Generation Mobile Communication Technology) communication systems, and may also be applied in 4/5G converged communication systems, specifically, in base station antenna systems.
The technical solutions provided in various embodiments of the present application will be described in detail below with reference to the accompanying drawings.
Referring to FIG. 4, which is a schematic structural diagram of an antenna element 400 provided by one embodiment of the present application, the antenna element includes a radiator 401, a balun short double wire 402, and a resonant assembly 403, wherein the radiator 401 is electrically connected to the balun short double wire 402; the resonant assembly 403 is embedded into the balun short double wire 402 to form at least one order of resonant circuit having low-frequency stop-band and high-frequency pass-band characteristics, and each order of resonant circuit includes an equivalent capacitor structure and an equivalent inductor structure.
Exemplarily, the antenna element generally includes two balun short double wires 402, each balun short double wire 402 is of an axisymmetric structure, these two balun short double wires are perpendicularly crossed to form a balun assembly, the radiator 401 is electrically connected to the balun assembly and fixed to an upper portion of the balun assembly. It can be understood that the three-dimensional structure of the balun assembly is similar to a structure consisting of four fan blades at an angle of 90 degrees, and in a top view the balun assembly, the four fan blades can be seen to be in a "cross" shape.
Since each balun short double wire 402 is of an axisymmetric structure, in one optional implementation, two resonant assemblies 403 may be respectively embedded into two sides, which can also be called the left and right sides, of the symmetry axis of each balun short double wire 402 in a mirror symmetry manner, and the structures of the two resonant assemblies 403 embedded into each balun short double wire 402 are exactly the same, that is, two resonant assemblies 403 may be embedded into the two sides of the symmetry axis of each balun short double wire 402 included in the balun assembly, and four resonant assemblies 403 may be embedded into the balun assembly. Optionally, two, three, or more resonant assemblies 403 may also be embedded into the two sides of the symmetry axis of each balun short double wire 402 included in the balun assembly, the number of embedded resonant assemblies may be flexibly set according to actual needs or the dimension of the balun short double wire, and is not specifically limited.
In order to improve the low-frequency stop-band and the high-frequency pass-band performance, at least one order of resonant circuit may be designed by using the resonant assembly 403, the resonant circuit may also be called an LC circuit, in which an inductor (represented by the letter L) and a capacitor (represented by the letter C) are connected with each other.
In one optional implementation, an EBG (Electromagnetic Band Gap) resonator is introduced. The EBG resonator may consist of two metal sheets and a metal guide column connected between the two metal sheets. The two metal sheets constitute a capacitor, the metal guide column constitutes an inductor, and the EBG resonator constitutes a first-order parallel resonator. The EBG resonator is embedded into the balun short double wire, a gap in a certain width is maintained between the EBG resonator and the balun short double wire, and the EBG resonator is coupled to the balun short double wire through the gap. The gap with capacitance characteristics and a thin metal strip wire with inductance characteristics form a second-order series resonator.
As shown in FIG. 5, one optional structure of the resonant assembly 403 may include an EBG resonator 501 and a metal double wire 502, wherein: the EBG resonator 501 and the metal double wire 502 are embedded into a surface of the balun short double wire 402; a gap in a set width is maintained between the EBG resonator 501 and the balun short double wire 402 , the EBG resonator 501 is coupled to the balun short double wire 402 through the gap, and a ratio of a width of the gap to a length of the gap is less than a set first ratio threshold, by way of example, the first ratio threshold may be set to 1/100, that is, the width of the gap is much smaller than the length of the gap; the metal double wire 502 is electrically connected to the balun short double wire 402, and a ratio of a length of the metal double wire 502 to a width of the metal double wire 502 is greater than a set second ratio threshold, by way of example, the second ratio threshold may be set to 50, that is, the length of the metal double wire is much smaller than the width of the metal double wire.
The balun short double wire 402 of an axisymmetric structure consists of 421 and 422 at the two sides of the symmetry axis, two resonant assemblies 403 of exactly the same structure may be embedded into the two sides of the symmetry axis of each balun short double wire 402 in a mirror symmetry manner, in embodiments of the present application, one resonant assembly is used as an example to illustrate the structure, referring to FIGS. 6a and 6b, which are a front side schematic structural diagram and a back side schematic structural diagram of the antenna element, respectively.
One optional structure of the EBG resonator 501 includes two metal sheets 601 and 601' of the same size. As shown in FIG. 6a, one metal sheet 601 is embedded into the front side of the balun short double wire 402; as shown in FIG. 6b, the other metal sheet 601' is embedded into a corresponding position at the back side of the balun short double wire 402.
Referring to FIG. 7, the middle of the metal sheet 601 has a metal strip wire 602 and a first metallized via hole 603 connected to the tail of the metal strip wire 602. Similarly, the middle of the metal sheet 601' has a metal strip wire 602' and a first metallized via hole 603' connected to the tail of the metal strip wire 602'. The first metallized via holes 603 and 603' in the two metal sheets 601 and 601' are electrically connected to form a metal guide column; and a gap in the set width is maintained between each of the two metal sheets 601 and 601' and the balun short double wire 402.
Since each balun short double wire 402 has a certain thickness, a distance corresponding to the thickness exists between the metal sheet 601 embedded into the front side of the balun short double wire 402 and the metal sheet 601' embedded into the back side of the balun short double wire 402, similarly, a distance corresponding to the thickness exists between the first metallized via holes 603 and 603', and electrical connection may be realized by coating space between the first metallized via holes 603 and 603' with metal (such as copper). It can be understood that in the square structure in the middle of the metal sheet embedded into the front side of the balun short double wire, a U-shaped structure except the metal strip wire and the exterior of the first metallized via hole is made of a non-metallic material, and the metal strip wire and the first metallized via hole structure connected to the tail of the metal strip wire in the middle of the metal sheet are made of a metal material. The metal double wire 502 includes two thin metal strip wires 604 and 604' of the same size. As shown in FIG. 6a, a thin metal strip wire 604 is embedded into the front side of the balun short double wire 402, and the tail of the thin metal strip wire 604 has a second metallized via hole 605; as shown in FIG. 6b, another thin metal strip wire 604' is embedded into a corresponding position at the back side of the balun short double wire 402, and the tail of the thin metal strip wire 604' has a second metallized via hole 605'. The second metallized via holes 605 and 605' in the two thin metal strip wires 604 and 604' are electrically connected, and electrical connection may be realized by coating space between the second metallized via holes 605 and 605' with metal (such as copper).
The EBG resonator 501 and the metal double wire 502 are embedded into the balun short double wire 401, so as to form a two-order resonator, which includes a first-order parallel resonator and a second-order series resonator. Compared with a first-order resonator, the two-order resonator has characteristics of wider low-frequency stop-band and high-frequency pass-band, wherein: the two metal sheets 601 and 601' in the EBG resonator 501 constitute an equivalent capacitor structure of the first-order parallel resonator, the metal strip wires 602 and 602' and the first metallized via holes 603 and 603' in the two metal sheets 601 and 601' in the EBG resonator 501 constitute an equivalent inductor structure of the first-order parallel resonator; a gap between the EBG resonator 501 and the balun short double wire 402 constitutes an equivalent capacitor structure of the second-order series resonator, and the metal double wire 502 constitutes an equivalent inductor structure of the second-order series resonator.
The resonance frequency of the first-order parallel resonator is related to the dimension of the EBG resonator, the larger the dimension of the EBG resonator, the lower the resonance frequency; the resonance frequency of the second-order series resonator is related to the gap between the EBG resonator and the balun short double wire as well as the length of the metal double wire. The parallel resonator and the series resonator both present a stop-band at a low-frequency resonance frequency, and capacitive and inductive characteristics presented by a high-frequency part cancel out each other, so that the high-frequency passband impedance characteristics remain unchanged, which finally presents low-frequency stop-band and high-frequency pass-band characteristics.
In the embodiments of the present application, the EBG resonator and the metal double wire are embedded into the balun short double wire to form the multi-order distributed series-parallel resonator, the order of the series-parallel resonator is controlled, and the low-frequency stop-band and high-frequency passband characteristics are adjusted, so that low-frequency common-mode induced current can be suppressed, and the problem of deterioration of a low-frequency antenna pattern in the multi-frequency common-aperture antenna can be overcome, and further the problem of common-mode coupling between high-frequency and low-frequency antennas in a multi-frequency common-aperture antenna is solved.
In one optional implementation, the resonant assembly may consist of a thin metal strip wire and a group of interwoven strip wires, the thin metal strip wire may be equivalent to an inductor, and the group of interwoven strip wires may be equivalent to a capacitor, the inductor and capacitor structures form a low-frequency resonant open circuit (also called a broken circuit) and a high-frequency resonant path state on the same surface of the balun short double wire.
As shown in FIG. 8, one optional structure of the resonant assembly 403 may include a thin metal strip wire 801 and a group of interwoven strip wires 802, wherein: the surface of the balun short double wire 402 has a gap in a set width; the thin metal strip wire 801 is electrically connected within the gap, and a ratio of a length of the thin metal strip wire 801 to a width of the thin metal strip wire 801 is greater than a set third ratio threshold, by way of example, the third ratio threshold may be set to 50, that is, the length of the thin metal strip wire is much greater than the width of the thin metal strip wire; the group of interwoven strip wires 802 includes at least two metal strip wires, the at least two metal strip wires are arranged in an up-and-down staggered manner within the gap, a ratio of a distance between adjacent metal strip wires to a width of the gap is less than a set fourth ratio threshold, by way of example, the fourth ratio threshold may be set to 1/10, that is, the distance between adjacent metal strip wires is much smaller than the width of the gap.
Exemplarily, as shown in FIG. 8, eight metal strips are arranged in an up-and-down staggered manner at the two sides of the symmetry axis of the balun short double wire 402, and the distance between adjacent metal strips is much smaller than the width of the gap.
In some cases, the thin metal strip wire 801 and the group of interwoven strip wires 802 may be embedded into the front side of the balun short double wire 402.
The thin metal strip wire 801 and the group of interwoven strip wires 802 are embedded into the balun short double wire 402, which may form a first-order parallel resonant circuit, wherein: the group of interwoven strip wires 802 constitutes an equivalent capacitor structure of the first-order parallel resonator, and the thin metal strip wire 801 constitutes an equivalent inductor structure of the first-order parallel resonator.
For the antenna element provided in the embodiments of the present application, a resonant assembly is embedded into the balun short double wire to form at least one order of resonant circuit, and each order resonant circuit includes an equivalent capacitance structure and an equivalent inductance structure, by the equivalent capacitance structure and the equivalent inductance structure in the resonant circuit, a stop-band can be presented at a low-frequency resonant frequency and a passband can be maintained at a high-frequency resonant frequency, thereby achieving the purpose of suppressing low-frequency common-mode induced current; and the antenna element may be applied to a multi-frequency common-aperture antenna, which can effectively solve the problem of common-mode coupling between high-frequency and low-frequency antennas in the multi-frequency common-aperture antenna.
As shown in FIG. 9, an embodiment of the present application further provides an antenna radiator 900, which includes a director 901, a support 902, and the above-mentioned antenna element 400, the support 902 is configured to connect the director 901 with the antenna element 400.
The antenna element 400 generally includes a radiator 401 and a balun assembly. The balun assembly is formed by two balun short double wires 402 that are perpendicularly crossed and combined, in one optional implementation, at least one group of resonant assemblies 403 provided in the embodiments of the present application may be embedded into the two sides of the symmetry axis of each balun short double wire in a mirror symmetry manner, referring to FIG. 10 for a perspective schematic diagram of the combined antenna radiator.
The antenna radiator provided in the embodiments of the present application applies the above-mentioned antenna element with low-frequency stop-band and high-frequency pass-band characteristics, which can present a stop-band at a low-frequency resonance frequency and maintain a pass-band at a high-frequency resonance frequency, thereby achieving the purpose of suppressing low-frequency common-mode induced current, the antenna radiator may be applied to a multi-frequency common-aperture antenna, which can effectively solve the problem of common-mode coupling between high-frequency and low-frequency antennas in the multi-frequency common-aperture antenna.
As shown in FIG. 11, an embodiment of the present application further provides an array, which includes a feeding network 1101 and at least two of the above-mentioned antenna radiator 900. Each antenna radiator 900 includes a director 901, a support 902, and the above-mentioned antenna element 400. Each of the antenna radiator 900 is electrically connected to the feeding network 1101 according to a set array structure.
The array may include at least one signal-transmitting channel and at least one signal-receiving channel, a signal enters an input port of the feeding network 1101, then the signal is fed into the balun assembly by the feeding network 1101, and finally the signal is transmitted to the outside world by the radiator 401 and the director 901; similarly, a signal may also be received by this path.
In order to realize the performance of the base station antenna, in an implementation, an array may be directly processed, and the unit capacity may be expanded according to actual antenna distribution, the array includes, but is not limited to, sub-array forms such as 1to2, 1to3, 1to4, 1to5, ..., 1toN, etc., "1" refers to a feeding network, and "2, 3, 4, 5, ..., N" refers to antenna elements. The 1to3 sub-array can obtain higher gain than the 1to2 sub-array, thereby achieving better network coverage.
The dimension of the radiator 401 in each antenna element 900 may be configured according to a set radiation frequency band, and the dimension of the radiator may be scaled at different proportions according to the shape of the radiator of the antenna radiator, so as to achieve radiation effects in different frequency bands, and based on the electromagnetic field theory, the smaller the dimension of the radiator, the higher the frequency band achieved.
For the array provided in the embodiments of the present application, the radiator dimension of each antenna radiator may be flexibly configured according to a set radiation frequency band, so as to form a multi-frequency common-aperture antenna; the above-mentioned antenna element with low-frequency stop-band and high-frequency pass-band characteristics is introduced into each antenna radiator, which can present a stop-band at a low-frequency resonance frequency and maintain a pass-band at a high-frequency resonance frequency, thereby achieving the purpose of suppressing low-frequency common-mode induced current and effectively solving the problem of common-mode coupling between high-frequency and low-frequency antennas in the array.
It should be noted that, as used herein, the terms "include", "comprise" or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a series of elements not only comprises those elements, but also comprises other elements that are not explicitly listed, or further comprises elements that are inherent to the process, method, article, or apparatus. Without further limitations, an element limited by "comprising a..." does not exclude the presence of other identical elements in the process, method, article, or device that comprises the element. In addition, it should be noted that the scope of the method and device in embodiments of this application is not limited to perform functions in the order shown or discussed, but may also include performing functions in a substantially simultaneous manner or in an opposite order according to the functions involved, for example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples can be combined in other examples.
The embodiments of the application are described above in conjunction with the accompanying drawings, but the application is not limited to the above-mentioned particular embodiments that are merely illustrative rather than limiting, a wide variety of forms can be made by a person skilled in the art under teachings of the application without departing from the spirit and scope of the application, and such forms all fall within the scope of the claims.

Claims

An antenna element, comprising a radiator, a balun short double wire, and a resonant assembly, wherein:
the radiator is electrically connected to the balun short double wire ;

the resonant assembly is embedded into the balun short double wire to form at least one order of resonant circuit having low-frequency stop-band and high-frequency pass-band characteristics, and each order of resonant circuit comprises an equivalent capacitor structure and an equivalent inductor structure.
The antenna element according to claim 1, wherein the resonant assembly comprises an electromagnetic band gap called EBG resonator and a metal double wire, wherein:
the EBG resonator and the metal double wire are embedded into a surface of the balun short double wire;

a gap in a set width is maintained between the EBG resonator and the balun short double wire, the EBG resonator is coupled to the balun short double wire through the gap, and a ratio of a width of the gap to a length of the gap is less than a set first ratio threshold; and

the metal double wire is electrically connected to the balun short double wire, and a ratio of a length of the metal double wire to a width of the metal double wire is greater than a set second ratio threshold.
The antenna element according to claim 2, wherein the EBG resonator comprises two metal sheets of the same size, a middle of each metal sheet has a metal strip wire and a first metallized via hole connected to a tail of the metal strip wire, one metal sheet is embedded into a front side of the balun short double wire, the other metal sheet is embedded into a corresponding position at a back side of the balun short double wire, the first metallized via holes in the two metal sheets are electrically connected, and the gap in the set width is maintained between each of the two metal sheets and the balun short double wire; and
the metal double wire comprises two thin metal strip wires of the same size, a tail of each thin metal strip wire has a second metallized via hole, one thin metal strip wire is embedded into a front side of the balun short double wire, the other thin metal strip wire is embedded into a corresponding position at a back side of the balun short double wire, and the second metallized via holes in the two thin metal strip wires are connected.
The antenna element according to claim 3, wherein the at least one order of resonant circuit comprises a first-order parallel resonator and a second-order series resonator, wherein:
the two metal sheets constitute an equivalent capacitor structure of the first-order parallel resonator, and the metal strip wires in the two metal sheets and the first metallized via holes constitute an equivalent inductor structure of the first-order parallel resonator; and

the gap between the EBG resonator and the balun short double wire constitute an equivalent capacitor structure of the second-order series resonator, and the metal double wire constitutes an equivalent inductor structure of the second-order series resonator.
The antenna element according to claim 1, wherein the resonant assembly comprises a thin metal strip wire and a group of interwoven strip wires, wherein:
a surface of the balun short double wire has a gap in a set width;

the thin metal strip wire is electrically connected within the gap, and a ratio of a length of the thin metal strip wire to a width of the thin metal strip wire is greater than a set third ratio threshold; and

the group of interwoven strip wires comprises at least two metal strip wires, the at least two metal strip wires are arranged in an up-and-down staggered manner within the gap, and a ratio of a distance between adjacent metal strip wires to a width of the gap is less than a set fourth ratio threshold.
The antenna element according to claim 5, wherein the thin metal strip wire and the group of interwoven strip wires are embedded into a front side of the balun short double wire.
The antenna element according to claim 6, wherein the at least one order of resonant circuit comprises a first-order parallel resonator circuit, wherein:
the group of interwoven strip wires constitutes an equivalent capacitor structure of the first-order parallel resonator, and the thin metal strip wire constitutes an equivalent inductor structure of the first-order parallel resonator.
The antenna element according to claim 1, wherein the antenna element comprises two balun short double wires of an axisymmetric structure, at least two the resonant assemblies are respectively embedded into two sides of a symmetry axis of each balun short double wire in a mirror symmetry manner, the two balun short double wires are perpendicularly crossed and combined to form a balun assembly; and the radiator is electrically connected to an upper portion of the balun assembly.
An antenna radiator, comprising a director, a support, and an antenna element according to any one of claims 1 to 8, wherein the support is configured to connect the director with the antenna element.
An array, comprising a feeding network, and at least two antenna radiators according to claim 9, each of the antenna radiators is electrically connected to the feeding network according to a set array structure, and a dimension of a radiator in each of the antenna radiator is configured according to a set radiation frequency band.