WO2023035390A1

WO2023035390A1 - Filtering antenna and wireless communication device

Info

Publication number: WO2023035390A1
Application number: PCT/CN2021/128537
Authority: WO
Inventors: 章秀银; 杨圣杰; 姚树锋; 薛泉
Original assignee: 华南理工大学
Priority date: 2021-09-07
Filing date: 2021-11-04
Publication date: 2023-03-16
Also published as: CN113497351B; CN113497351A

Abstract

The present application relates to a filtering antenna and a wireless communication device. The filtering antenna comprises a feed network, a metal ground, a feed patch, and a plurality of short-circuit patches coplanar with the feed patch; the short-circuit patches are connected to the metal ground by means of short-circuit columns; the feed patch is connected to the feed network by means of a feed column; the feed patch comprises first defect structure groups and second defect structure groups which are formed by a plurality of first defect structures; the first defect structure groups are symmetrically arranged at the two sides of a straight line where the feed column in a first polarization direction is located; the second defect structure groups are symmetrically arranged at the two sides of a straight line where the feed column in a second polarization direction is located; and the plurality of short-circuit patches are respectively provided in the first defect structures. According to the technical solution provided by embodiments of the present application, additional insertion loss caused by additional filters can be avoided, and the antenna performance is not reduced.

Description

Filter antenna and wireless communication equipment

technical field

The present application relates to the technical field of radio frequency communication, in particular to a filter antenna and wireless communication equipment.

Background technique

With the rapid development of wireless communication technology, the wireless communication system is also developing in the direction of miniaturization, integration and multi-function. In the radio frequency front-end of the wireless communication system, the filter is an indispensable device, and the antenna is an important device for transmitting and receiving wireless signals, and the setting of the filter and the antenna affects the integration degree and system index of the system.

Traditionally, in wireless communication systems, the antenna is used as a load of the filter and cascaded with the filter; or the antenna is used as the last resonator of the filter, and at the same time it is used as a feed patch to send or receive signals, so as to realize The two properties of radiation and filtering.

However, the above-mentioned antenna needs to be cascaded with an additional filter, and adding a filter will bring additional insertion loss and degrade the performance of the antenna.

Contents of the invention

Based on this, an embodiment of the present application provides a filter antenna and a wireless communication device, which can avoid additional insertion loss caused by additional filters without degrading antenna performance, and achieve high roll-off filter performance.

In the first aspect, a filter antenna is provided. The filter antenna includes a feed network arranged in layers, a metal ground and a feed patch, and a plurality of short-circuit patches coplanar with the feed patch; the short-circuit patch passes through The short-circuit column is connected to the metal ground; the feed patch is connected to the feed network through the feed column; wherein, the feed patch includes a first defect structure group and a second defect structure group composed of a plurality of first defect structures; A group of defective structures is arranged symmetrically on both sides of the straight line where the feeding columns in the first polarization direction are located; a second group of defective structures is symmetrically arranged on both sides of the straight line where the feeding columns in the second polarization direction are located; multiple short-circuit patches respectively arranged in each first defect structure.

In one embodiment, each first defect structure is disposed outside of the area surrounded by each feeding column.

In one of the embodiments, the first defect structure group includes four first defect structures, and each feeding column in the first polarization direction corresponds to two first defect structures; the second defect structure group includes four first defect structures structure, each feeding column in the second polarization direction corresponds to two first defect structures.

In one of the embodiments, the distance between the two first defect structures varies with the position of the first resonance point.

In one embodiment, the first defect structure is a rectangular structure.

In one embodiment, the feed patch is a rectangular patch, and the four corners of the rectangular patch are respectively provided with second defect structures; each of the second defect structures is provided with a short circuit patch.

In one embodiment, the filter antenna further includes a parasitic patch, and the parasitic patch is stacked with the feeding patch and is located on a side of the feeding patch away from the metal ground.

In one embodiment, the parasitic patch is provided with a plurality of third defect structures; the positions of the third defect structures correspond to the positions of the first defect structures.

In one of the embodiments, the size of the third defect structure varies with the position of the second resonance point.

In a second aspect, a wireless communication device is provided, and the wireless communication device includes the filter antenna in any embodiment of the first aspect above.

The above filter antenna and wireless communication equipment, the filter antenna includes a stacked feed network, a metal ground and a feed patch, and a plurality of short-circuit patches coplanar with the feed patch; the short-circuit patch is connected to the The metal ground is connected; the feed patch is connected to the feed network through the feed post; wherein, the feed patch includes a first defect structure group and a second defect structure group composed of a plurality of first defect structures; the first defect structure The group is symmetrically arranged on both sides of the line where the feed column in the first polarization direction is located; the second defect structure group is symmetrically arranged on both sides of the line where the feed column in the second polarization direction is located; multiple short-circuit patches are respectively arranged on within each first defect structure. In the technical solution provided by the embodiment of the present application, since there is no need to cascade additional filters, it will not bring additional insertion loss and will not reduce the performance of the antenna; and through the first defect structure set in the filter antenna and the The second defect structure group generates a radiation zero point on both sides of the passband, so that high roll-off filtering performance can be realized.

Description of drawings

FIG. 1 is a structural diagram of a filter antenna provided in an embodiment of the present application;

FIG. 2 is a structural diagram of a feed patch provided in an embodiment of the present application;

FIG. 3 is a structural diagram of another feed patch provided by the embodiment of the present application;

FIG. 4 is a structural diagram of a filter antenna provided in an embodiment of the present application;

FIG. 5 is a structural diagram of a parasitic patch provided by an embodiment of the present application;

FIG. 6 is an optimized schematic diagram of a parasitic patch and a feed patch provided in an embodiment of the present application;

FIG. 7 is an S-parameter diagram of a filter antenna provided in an embodiment of the present application;

FIG. 8 is a gain curve diagram of a filter antenna provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the embodiments of the present application. However, the embodiment of the present application can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without violating the connotation of the embodiment of the present application. EXAMPLE LIMITATIONS.

In the description of the embodiments of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front" , "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axis The azimuths or positional relationships indicated by "to", "radial", "circumferential", etc. are based on the azimuths or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying the The device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present application.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the embodiments of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this embodiment of the application, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense, for example, it can be a fixed connection or a fixed connection. Disconnected connection, or integrated; may be mechanically connected, may also be electrically connected; may be directly connected, may also be indirectly connected through an intermediary, may be an internal communication between two components or an interactive relationship between two components, unless otherwise There are clear limits. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific situations.

In the embodiment of the present application, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first feature and the second feature may pass through the middle of the second feature. Media indirect contact. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the embodiments of the present application are for the purpose of illustration only, and do not represent the only implementation Way.

A filter antenna provided in an embodiment of the present application has a structure as shown in FIG. 1 . Among them, the filter antenna 10 includes a stacked feed network 11, a metal ground 12 and a feed patch 13, and a plurality of short-circuit patches coplanar with the feed patch 13; The ground 12 is connected; the feed patch 13 is connected to the feed network 11 through the feed column; wherein, the feed patch 13 includes a first defect structure group and a second defect structure group composed of a plurality of first defect structures; A group of defective structures is arranged symmetrically on both sides of the straight line where the feeding columns in the first polarization direction are located; a second group of defective structures is symmetrically arranged on both sides of the straight line where the feeding columns in the second polarization direction are located; multiple short-circuit patches respectively arranged in each first defect structure.

Among them, the entire filter antenna is made of multi-layer pcb boards bonded together. The filter antenna can be processed by AIP technology, has strong stability and relatively low cost, and can also be processed by other technologies. The filter antenna may be a millimeter wave dual-polarized filter antenna, or may be another type of filter antenna, which is not specifically limited in this embodiment. The feed network 11 is used to feed the feed unit of the filter antenna, the feed patch 13 is a part of the feed unit, and the feed patch 13 is connected to the feed network 11 through a feed column. The feed network 11 is printed on the pcb board. The feed network 11 can be a dual-polarized differential feed network, or other types of feed networks. If the feed network 11 is a dual-polarized differential feed network, the feed network The electrical network 11 can introduce a phase difference of 180 degrees, and is composed of two orthogonal single-polarized differential feed structures. A plurality of short-circuit patches are arranged on the same plane of the feed patch 13, and the setting of parameters such as the number and position of the short-circuit patches can be determined according to actual needs. Each short-circuit patch is connected to the metal ground 12 through a short-circuit post, and the feed patch 13 forms a coupling with the set short-circuit patch, and the setting of parameters such as the shape and position of the feed patch 13 can also be determined according to actual needs. There is a certain gap between the short-circuiting patch and the feeding patch 13 , and local connections can also be made through thin wires, which is not specifically limited in this embodiment.

The feed patch 13 may include a first defect structure group and a second defect structure group composed of a plurality of first defect structures, and the first defect structure group may be symmetrically arranged on two sides of the line where the feed column in the first polarization direction is located. On the side, the second defect structure group can be symmetrically arranged on both sides of the line where the feeding column in the second polarization direction is located, and a plurality of short-circuit patches are respectively arranged in each first defect structure, and a short-circuit column is arranged in the short-circuit patch. The first polarization direction and the second polarization direction may be a 0 degree polarization direction or a 90 degree polarization direction, and the first polarization direction and the second polarization direction are different polarization directions. The first defect structure group and the second defect structure group are used to generate a radiation zero point, also called a resonance point, by setting the position, shape and number of the first defect structure in the first defect structure group and the second defect structure group and other parameters can make the filter antenna produce different filtering effects.

In this embodiment, the filter antenna includes a stacked feed network, a metal ground and a feed patch, and a plurality of short-circuit patches coplanar with the feed patch; the short-circuit patch is connected to the metal ground through a short-circuit column The feed patch is connected to the feed network through the feed post; wherein, the feed patch includes a first defect structure group and a second defect structure group composed of a plurality of first defect structures; the first defect structure group is arranged symmetrically On both sides of the straight line where the feed column is located in the first polarization direction; the second defect structure group is symmetrically arranged on both sides of the line where the feed column is located in the second polarization direction; a plurality of short-circuit patches are respectively arranged on each first within the defective structure. Since there is no need to cascade additional filters, there will be no additional insertion loss and no reduction in antenna performance; and through the first defect structure group and the second defect structure group set in the filter antenna, on both sides of the passband A radiation null is generated respectively, from which a filter performance with high roll-off can be achieved.

In one embodiment, the above-mentioned first defect structure is disposed outside the area surrounded by each feeding column. Wherein, the feeding posts of the filtering antenna may include four feeding posts, the four feeding posts may be arranged orthogonally, and the area surrounded by them may be a rectangle. The first defect structures may or may not be evenly distributed on the outside of each feeding column, which may be determined according to actual conditions.

In a possible embodiment, please refer to FIG. 2 , which shows a structural diagram of a feed patch provided by an embodiment of the present application. The first defect structure group includes four first defect structures, and each The feeding columns in one polarization direction correspond to two first defect structures; the second defect structure group includes four first defect structures, and each feeding column in a second polarization direction corresponds to two first defect structures.

Wherein, the feed columns in FIG. 2 are four independent dots that are not in the box, and the feed columns are connected to the feed network 11 . The first defect structure group includes four first defect structures 20, the second defect structure group includes four first defect structures 21, of course, the first defect structure group may also be four first defect structures 21, the second defect structure A group may be four first defect structures 20, which is not specifically limited in this embodiment.

The rectangular frames in the first defect structures 20 and 21 are short-circuit patches, and the dots in the short-circuit patches are short-circuit columns; the first defect structures 20 and 21 can be rectangular structures, U-shaped structures, or other structures. The shape and structure are not specifically limited in this embodiment. Each feeding column in the first polarization direction corresponds to two first defect structures, and each feeding column in the second polarization direction corresponds to two first defect structures, that is, the first defect structures are uniformly distributed in each feeding The outer sides of the columns, the outer sides of each feeding column correspond to two first defect structures. The feeding columns in the first polarization direction may be two horizontal feeding columns, or may be two vertical feeding columns. For example, when the antenna works in the 0 degree polarization direction, two pairs of short-circuit columns 21 coupled on the H surface introduce a radiation zero point, and two pairs of 20 short-circuit columns coupled on the E surface introduce another radiation zero point; similarly, the antenna works in an orthogonal When the polarization direction is 90 degrees, two pairs of short-circuit columns 20 coupled on the H-plane introduce a radiation zero point, and two pairs of short-circuit columns 21 coupled on the E-plane introduce another radiation zero point.

In addition, the distance between the two first defect structures can vary with the position of the first resonance point. The closer the distance between the two first defect structures, the lower the first resonance point moves to the low frequency, and the farther it is from the filter antenna. The passband of the filter antenna; the farther the distance between the two first defect structures, the first resonance point moves to the high frequency, and thus the closer to the passband of the filter antenna. Similarly, the thinner the short-circuit column in the first defect structure is, the larger the inductance component is, and the first resonance point moves to the low frequency, thus the farther away from the passband of the filter antenna; the thicker the short-circuit column in the first defect structure is equivalent to The smaller the inductance component is, the higher the first resonance point moves to the high frequency, and the closer it is to the passband of the filter antenna. In addition, the closer the short-circuit patch is to the feed patch, the first resonance point moves to low frequency, thereby moving away from the passband of the filter antenna; the farther the short-circuit patch is from the feed patch, the first resonance point moves to high frequency, thereby close to the passband of the filter antenna.

In this embodiment, by setting the first defect structure group and the second defect structure group in the feed patch, the H-plane coupling short-circuit column and the E-plane coupling short-circuit column respectively generate a radiation on both sides of the passband of the filter antenna. zero, to achieve filtering performance.

In one embodiment, please refer to FIG. 3 , which shows a structural diagram of another feed patch provided by the embodiment of the present application. The above-mentioned feed patch 13 can be a rectangular patch, and the four rectangular patches Second defect structures 22 may be provided at the corners, and each second defect structure 22 may be provided with a short-circuit patch 31 and a short-circuit post 32 . The second defect structure 22 may be rectangular or other shapes. The short-circuit patch and the short-circuit post in the second defect structure 22 can generate a radiation zero point outside the passband of the filter antenna, so that the filter antenna can achieve high roll-off filtering performance. And, similarly, the thinner the short-circuit column in the second defect structure is, the larger the inductance component is, and the radiation zero point moves to the low frequency, thus the farther away from the passband of the filter antenna; the thicker the short-circuit column in the second defect structure, it is equivalent to As the inductance component is smaller, the radiation zero point moves to high frequency, thus closer to the passband of the filter antenna. Moreover, the closer the short-circuit patch is to the feed patch, the radiation zero point moves to low frequency, thereby moving away from the passband of the filter antenna; the farther the short-circuit patch is from the feed patch, the radiation zero point moves to high frequency, thereby closer to the filter antenna the passband.

In one embodiment, please refer to FIG. 4 , which shows a structural diagram of a filter antenna provided by an embodiment of the present application. The above-mentioned filter antenna 10 also includes a parasitic patch 14, a parasitic patch 14 and a feed patch 13 The stacked arrangement is located on the side of the feed patch 13 away from the metal ground 12 . The parasitic patch 14 may be a complete rectangular structure, or may include a defect structure.

Among them, the parasitic patch 14 can generate another radiation zero point outside the passband of the filter antenna. In order to make the radiation zero point close to the passband to achieve high roll-off, if the parasitic patch 14 is not provided with a third defect structure, It is necessary to increase the area of the parasitic patch 14 so that the radiation zero generated by it can be outside the low frequency band and close to the passband of the filter antenna. Therefore, in order to optimize the parasitic patch 14, optionally, please refer to FIG. The position of the defect structure 141 and the third defect structure 141 correspond to the position of the first defect structure. The shape and number of the third defect structures 141 may also be set according to the first defect structures, and the shape and size of each third defect structure 141 may be the same.

The size of the third defect structure 141 changes with the position of the second resonance point. The larger the third defect structure 141 is, the second resonance point moves to low frequency, thus the farther away from the passband of the filter antenna; the more the third defect structure 141 Smaller, the second resonance point moves to the high frequency, so that it is closer to the passband of the filter antenna. The design optimization process of the parasitic patch 14 and the feeding patch 13 is shown in FIG. 6 , which is a schematic diagram of optimization of a parasitic patch and the feeding patch provided in the embodiment of the present application. Wherein, the first layer is the optimization process of the parasitic patch 14 , and the second layer is the optimization process of the feed patch 13 .

In this embodiment, by setting the parasitic patch and the third defect structure on the parasitic patch, a radiation zero point can be generated outside the passband of the filter antenna, so that the filter antenna has better filtering performance.

In one embodiment, the filter antenna includes a feed network, a metal ground, a feed patch, a parasitic patch, and a plurality of short-circuit patches coplanar with the feed patch; the short-circuit patch is connected to the metal ground through a short-circuit column Connection; the feed patch is connected to the feed network through the feed post; wherein, the feed patch includes a first defect structure group and a second defect structure group composed of a plurality of first defect structures; the first defect structure group is symmetrical It is arranged on both sides of the straight line where the feeding column is located in the first polarization direction; the second defect structure group is symmetrically arranged on both sides of the straight line where the feeding column is located in the second polarization direction; within a defective structure. Each first defect structure is arranged on the outside of the area surrounded by each feeding column. The first defect structure group includes four first defect structures, and each feeding column in the first polarization direction corresponds to two first defect structures. ; The second defect structure group includes four first defect structures, each feeding column in the second polarization direction corresponds to two first defect structures, and the distance between the two first defect structures varies with the position of the first resonance point changes; the first defect structure is a rectangular structure. The feeding patch is a rectangular patch, and the four corners of the rectangular patch are respectively provided with second defect structures; each of the second defect structures is provided with a short circuit patch. The parasitic patch and the feed patch are stacked and located on the side of the feed patch away from the metal ground; the parasitic patch is provided with multiple third defect structures; the position of the third defect structure corresponds to the position of the first defect structure; The size of the third defect structure varies with the position of the second resonance point.

The filter antenna designed according to the method provided in this embodiment can produce four radiation zero points on both sides of the passband of the filter antenna, which are respectively formed by the parasitic patch with a defective structure and the H-plane coupling short-circuit column in the middle of the feed patch. , E-plane coupling short-circuit post introduction, short-circuit patch and short-circuit post introduction in the defect structure placed at the four corners of the feed patch, so as to realize the filter characteristics of high roll-off at the edge of the passband.

In one embodiment, the wireless communication device includes the filter antenna as in any one of the above embodiments.

For the implementation principles and beneficial effects of the wireless communication device provided in this embodiment, reference may be made to the limitations of the embodiments of the filter antenna above, and details will not be repeated here.

In addition, the present application also conducted experiments on the filter antenna designed according to the method provided in the above-mentioned embodiments, as shown in Figure 7, which is an S-parameter diagram of a filter antenna provided in the embodiment of the present application, it can be seen that the filter antenna The working bandwidth of the antenna in both polarization directions includes 26.5-29.5GHz, the return loss S11 and S22 are both above 10dB, and the polarization isolation S12 of the antenna in the working frequency band is always kept above 40dB.

Fig. 8 is a gain curve diagram of a filter antenna provided by an embodiment of the present application, wherein the gain of the filter antenna is stable within the passband of 26.5-29.5 GHz, which remains above 7.87 dB, and the gain variation range is within 0.3 dB. There are four radiation nulls Null#1, Null#2, Null#3, and Null#4 on both sides of the passband, where Null#1 is introduced by a parasitic patch with a defect structure, and Null#2 and Null#4 are respectively introduced by the feeder The H-plane coupling short-circuit column and the E-plane coupling short-circuit column in the middle of the electric patch are introduced, and Null#3 is introduced by the short-circuit patch and the short-circuit column in the defect structure placed at the four corners of the feed patch, so as to achieve high roll-off at the edge of the passband filter characteristics. Moreover, the gain suppression of 20-25GHz outside the low frequency band exceeds 17.8dB, and the gain suppression of 30.5-60GHz outside the high frequency band exceeds 19dB.

The technical features of the above embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be It is considered to be within the range described in this specification.

The above examples only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of protection of the patent application should be based on the appended claims.

Claims

A filter antenna, characterized in that the filter antenna includes a stacked feed network, a metal ground and a feed patch, and a plurality of short-circuit patches coplanar with the feed patch; the The short-circuit patch is connected to the metal ground through a short-circuit post; the feed patch is connected to the feed network through a feed post;

Wherein, the feed patch includes a first defect structure group and a second defect structure group composed of a plurality of first defect structures; the first defect structure group is symmetrically arranged where the feed column in the first polarization direction is located. On both sides of the straight line; the second defect structure group is symmetrically arranged on both sides of the straight line where the feeding column in the second polarization direction is located;

The plurality of shorting patches are respectively disposed in each of the first defect structures.
The filter antenna according to claim 1, wherein each of the first defect structures is surrounded by an area surrounded by each of the feeding posts.
The filter antenna according to claim 2, wherein the first defect structure group includes four first defect structures, and each feeding column in the first polarization direction corresponds to two first defect structures; The second defect structure group includes four first defect structures, and each feeding column in the second polarization direction corresponds to two first defect structures.
The filter antenna according to claim 3, wherein the distance between the two first defect structures varies with the position of the first resonance point.
The filter antenna according to any one of claims 1-4, wherein the first defect structure is a rectangular structure.
The filter antenna according to any one of claims 1-4, wherein the feed patch is a rectangular patch, and the four corners of the rectangular patch are respectively provided with second defect structures; each second One short patch is provided in the defect structure.
The filter antenna according to any one of claims 1-4, characterized in that the filter antenna further comprises a parasitic patch, the parasitic patch is stacked with the feed patch, and is located on the feed patch The side of the patch away from the metal ground.
The filter antenna according to claim 7, wherein the parasitic patch is provided with a plurality of third defect structures; the positions of the third defect structures correspond to the positions of the first defect structures.
The filter antenna according to claim 8, wherein the size of the third defect structure varies with the position of the second resonance point.
A wireless communication device, characterized in that the wireless communication device comprises the filter antenna according to any one of claims 1-9.