WO2019242577A1

WO2019242577A1 - Multi-antenna structure and mobile communication device

Info

Publication number: WO2019242577A1
Application number: PCT/CN2019/091488
Authority: WO
Inventors: 李钦岗; 胡育根
Original assignee: 青岛海信移动通信技术股份有限公司
Priority date: 2018-06-20
Filing date: 2019-06-17
Publication date: 2019-12-26
Also published as: CN110620290A; CN110620290B

Abstract

Disclosed are a multi-antenna structure and a mobile communication device. The multi-antenna structure of the present application comprises a radiator, wherein the radiator comprises a first feed point, a second feed point, and a third feed point, and the second feed point is located between the first feed point and the third feed point; a first signal source that is electrically connected with the first feed point of the radiator by means of a first matching circuit; and a second signal source, wherein the second signal source comprises a first output end and a second output end, the first output end is connected with the third feed point of the radiator by means of a second matching circuit, and the second output end is connected with the second feed point of the radiator by means of a third matching circuit. A handover switch is further comprised; the fixing end of the handover switch is connected with the second feed point; the movable end of the handover switch is selectively connected to the ground or connected to the second output end; the third matching circuit is provided between the movable end and the second output end.

Description

Multi-antenna structure and mobile communication equipment

Cross-reference to related applications

This application claims priority from a Chinese patent application filed on June 20, 2018 with the Chinese Patent Office, application number 2018106406163, and application name "a multi-antenna structure and mobile communication device", the entire contents of which are incorporated herein by reference. Applying.

Technical field

The present application relates to the technical field of communication terminals, and in particular, to a multi-antenna structure and mobile communication equipment.

Background technique

With the deepening of 5G technology research, Multiple-Input Multiple-Output (MIMO) technology will become standard for 5G products. The MIMO technology refers to configuring multiple transmitting antennas and receiving antennas on the transmitting end and the receiving end respectively, so that signals are transmitted and received through multiple antennas on the transmitting end and the receiving end, thereby improving communication quality. MIMO technology can make full use of space resources and achieve multiple transmissions and multiple receptions through multiple antennas. Without increasing spectrum resources and antenna transmit power, it can double the system channel capacity and show obvious advantages, so it is considered as the next The core technology of next generation mobile communication.

Summary of the Invention

The embodiments of the present application provide a multi-antenna structure and a mobile communication device, which can be arranged in a small space.

In order to achieve the above object, an embodiment of the present application provides a multi-antenna structure including a radiator, the radiator includes a first feeding point, a second feeding point, and a third feeding point, and the second A feeding point is located between the first feeding point and a third feeding point; a first signal source, and the first signal source is electrically connected to a first feeding point of the radiator through a first matching circuit; A second signal source, the second signal source includes a first output terminal and a second output terminal, the first output terminal is connected to a third feeding point of the radiator through a second matching circuit, and the second The output end is connected to the second feeding point of the radiator through a third matching circuit, and further includes a switch. The fixed end of the switch is connected to the second feeding point. The active end of the switch is selected. A ground connection or the second output terminal, a third matching circuit is provided between the movable terminal and the second output terminal, and when the switch is switched to the first working position, the switch Communicating the second feeding point of the radiator with the ground, connecting the The second feed point of the radiator is disconnected from the third matching circuit; when the switch is switched to the second working position, the switch switches the second feed point of the radiator and the first matching point The three matching circuits are connected to disconnect the second feeding point of the radiator from the ground.

On the other hand, an embodiment of the present application further provides a mobile communication device, including the multi-antenna structure described in the above technical solution.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions in the embodiments of the present application or the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative work.

FIG. 1 is a schematic structural diagram of a multiple antenna structure according to an embodiment of the present application;

2 is a schematic structural diagram of a multi-antenna structure according to an embodiment of the present application when a switch is switched to a first working position;

3 is a schematic structural diagram of a multi-antenna structure according to an embodiment of the present application when a switch is switched to a second working position;

FIG. 4 is another schematic structural diagram of a multi-antenna structure according to an embodiment of the present application; and

FIG. 5 is a partial structural schematic diagram of a metal rear case in a mobile communication device according to an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

In the description of this application, it needs to be understood that the terms “center”, “up”, “down”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, The orientations or positional relationships indicated by "top", "bottom", "inner", "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended or implied The device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application.

In the description of this application, it should be noted that the terms "installation", "connected", and "connected" should be understood in a broad sense, unless explicitly stated and limited otherwise. For example, they can be fixed connections or removable. Connected, or integrally connected; for those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, "a plurality" means two or more.

Because mobile communication devices (such as mobile phones) need to be compatible with multi-standard and 5G multi-antenna designs, the number of antennas is relatively large. At the same time, consumers' preference for the appearance of mobile phones (such as screen ratio) and metal casings leads to more antenna design space. More and more narrow. Therefore, the multi-antenna design and the antenna design space environment become difficult points for the design of mobile communication equipment signals.

Referring to FIG. 1 and FIG. 4, a multi-antenna structure provided by an embodiment of the present application includes a radiator 1, and the radiator 1 includes a first feeding point 11, a second feeding point 12, and a third feeding point 13. The second feeding point 12 is located between the first feeding point 11 and the third feeding point 13; a first signal source 2; the first signal source 2 is connected to the first signal source 2 through a first matching circuit 21; The first feed point 11 of the radiator 1 is electrically connected; the second signal source 3 includes a first output terminal 31 and a second output terminal 32, and the first output terminal 31 is passed through a second matching The circuit 33 is connected to the third feeding point 13 of the radiator 1, and the second output terminal 32 is connected to the second feeding point 12 of the radiator 1 through a third matching circuit 34, and further includes a switch 4 The fixed end 41 of the changeover switch 4 is connected to the second feeding point 12, and the active end 42 of the changeover switch 4 is selectively connected to the ground GND or the second output end 32. The active end 42 is connected to the second output point 32. A third matching circuit 34 is disposed between the second output terminals 32. As shown in FIG. 2, when the changeover switch 4 is switched to the first working position, the changeover switch 4 communicates the second feeding point 12 of the radiator 1 with the ground, and connects the first The second feeding point 12 is disconnected from the third matching circuit 34. As shown in FIG. 3, when the changeover switch 4 is switched to the second working position, the changeover switch 4 communicates the second feeding point 12 of the radiator 1 with the third matching circuit 34, The second feed point 12 of the radiator 1 is disconnected from the ground. As shown in FIGS. 1 to 3, the switch 4 is a single-pole double-throw switch.

In the multi-antenna structure provided in the embodiment of the present application, when the first signal source 2 and the second signal source 3 are required to work simultaneously in a dual antenna scenario, the switch 4 can be switched to the first working position, so that the switch 4 will The second feeding point 12 of the radiator 1 is connected to the ground, and the second feeding point 12 of the radiator 1 is disconnected from the third matching circuit 34. As a result, antenna branches can be formed respectively from the first feeding point 11 to one end of the radiator 1 and from the third feeding point 13 to the other end of the radiator 1, and at the same time, the ground of the second feeding point 12 can make the two antennas more flexible. High isolation. When the first signal source 2 and the second signal source 3 are required to achieve dual-frequency operation, the switch 4 can be switched to the second working position, so that the switch 4 will switch the second feed point 12 of the radiator 1 to The third matching circuit 34 communicates and disconnects the second feeding point 12 of the radiator 1 from the ground, so that the first signal source 2 can be connected to an antenna branch supporting the first frequency band, and the second signal source 3 Connected to two ends of radiator 1 through two feed points and connected to antenna branches that support two different frequency bands. For example, the second signal source 3 is connected to one end of the radiator 1 through the third feeding point 13 to the radiator 1 and the second signal source 3 is connected to the other radiator 1 through the second feeding point 12. One end is connected to another antenna branch supporting the second frequency band, and the other antenna branch and the antenna branch supporting the first frequency band connected to the first signal source 2 are the same antenna branch, wherein the first frequency band is different from the second frequency band . At this time, the second signal source 3 has a multi-band working scenario. The switching between the two working positions by the switch 4 can achieve high isolation in the same frequency band and compatibility of multi-feed multi-band antennas, so that a multi-antenna structure can be arranged in a narrow space.

The function of the matching circuit (that is, the first matching circuit 21, the second matching circuit 33, and the third matching circuit 34) is to adjust the self impedance of the antenna to the same as the impedance of the signal source, so that the current energy can be passed through the antenna to the maximum extent. Converted into electromagnetic radiation energy. The configuration of the matching circuit may be a capacitor or an inductor. Those skilled in the art may select the matching of components and parameter values of the matching circuit according to different products and different design scenarios, which is not specifically limited herein.

As shown in FIG. 1, the radiator 1 may have a long structure, and the first feeding point 11, the second feeding point 12, and the third feeding point 13 are sequentially arranged along the same straight direction of the radiator 1. . The shape of the radiator 1 is not limited to a long shape, and may be any other shape.

As shown in FIG. 1, the first feeding point 11 may be disposed near the first end 14 of the radiator 1, and the third feeding point 13 may be disposed near the second end 15 of the radiator 1. The first end 14 and the second end 15 of the radiator are located on the same straight line as the first feeding point 11, the second feeding point 12 and the third feeding point 13. In order to make the dual antennas in the same frequency band work better at the same time, the distance from the first feeding point 11 to the first end 14 of the radiator 1 is equal to the third feeding point 13 to the first end of the radiator 1. A distance of 15 at both ends. Therefore, as shown in FIG. 2, when the switch 4 is switched to the first working position, the first feeding point 11 to the first end 14 of the radiator 1 and the third feeding point 13 to the second end of the radiator 1 can be made. The terminals 15 respectively form antenna branches of the first frequency band f1, and two ground antennas in the same frequency band can have higher isolation due to the grounding of the second feeding point 12. Therefore, when the switch 4 is switched to the first In the working position, the first signal source 2 and the second signal source 3 can make the dual antennas in the same frequency band work better simultaneously.

In order to achieve a multi-band working scenario, as shown in FIG. 3, the switch 4 can be switched from the first working position to the second working position, so that the first feeding point 11 to the first end 14 of the radiator 1 forms a first frequency band. The antenna branch of f1, the second feed point 12 to the first end 14 of the radiator 1 forms an antenna branch of the second frequency band f2, and the third feed point 13 to the second end 15 of the radiator 1 forms the first frequency band f1. Antenna branch. The second feed point 12 to the first end 14 of the radiator 1 forms an antenna branch of the second frequency band f2. This is because the section from the second feed point 12 to the first end 14 of the radiator 1 is generated in the second frequency band f2. Resonant part. At this time, since the first signal source 2 and the second signal source 3 are both connected to the antenna branch supporting the first frequency band f1, in order to prevent mutual interference, the first signal source 2 and the second signal source 3 can be transmitted in the same frequency band signal. When using time division multiplexing mode transmission. The first signal source 2 and the second signal source 3 can transmit simultaneously when transmitting signals in different frequency bands. For example, the first signal source 2 and the second signal source 3 are both connected to an antenna branch supporting the first frequency band f1, and the second signal source 3 is also connected to an antenna branch supporting at least one second frequency band f2 different from the first frequency band f1. connection. The second frequency band may be at least one frequency band corresponding to CDMA, GSM, wifi, and GPS. The first frequency band f1 signal and at least one second frequency band f2 signal are transmitted simultaneously.

The embodiment of the present application does not limit the form of the radiator 1. The radiator 1 may be a monopole antenna, a PIFA (Planar Inverted F-shaped Antenna) antenna, or a loop (LOOP) antenna, that is, the radiator 1 The ground point for changing the function of the antenna may be added, for example, a ground point is added at a predetermined position of the radiator 1. These ground points that change the function of the antenna have nothing to do with the effect of improving the isolation of the antenna.

Referring to FIG. 4, the switch 4 is a variable capacitor. One end of the variable capacitor is connected to the second feeding point 12 as a fixed end, and the other end is selectively connected to the ground GND or the third matching circuit 34 as a movable end. The variable capacitor is switched between a first working position and a second working position. In the first working position, the second feeding point 12 of the radiator 1 is connected to the ground, and the second feeding point 12 of the radiator 1 is disconnected from the third matching circuit 34. In the second working position, the second feeding point 12 of the radiator 1 is disconnected from the ground, and the second feeding point 12 of the radiator 1 is in communication with the third matching circuit 34.

On the other hand, an embodiment of the present application provides a mobile communication device including the multi-antenna structure described in any one of the foregoing embodiments.

Since the mobile communication device provided in the embodiment of the present application adopts the multi-antenna structure described in any of the above embodiments, when the mobile communication device requires the first signal source 2 and the second signal source 3 to be simultaneously in the scenario of dual antennas in the same frequency band During operation, the switch 4 can be switched to the first working position, so that the switch 4 can communicate the second feed point 12 of the radiator 1 with the ground, and connect the second feed point 12 of the radiator 1 with the ground. The third matching circuit 34 is turned off, so that the first feeding point 11 to one end of the radiator 1 and the third feeding point 13 to the other end of the radiator 1 may form antenna branches, respectively. The ground at point 12 can make the two antennas have higher isolation. When the mobile communication device needs the first signal source 2 and the second signal source 3 to achieve dual-frequency operation, the switch 4 can be switched to the second working position, so that The switch 4 communicates the second feeding point 12 of the radiator 1 with the third matching circuit 34, and disconnects the second feeding point 12 of the radiator 1 from the ground, so that the first A signal source 2 is connected to an antenna branch supporting the first frequency band, and a second signal source 3 Respectively through the two feeding points at both ends of the body 1 to the radiation, so that the second signal source 3 is connected to two distinct bands of antenna branches. At this time, the second signal source 3 has a multi-band working scenario. The switching between the two working positions by the switch 4 can achieve high isolation in the same frequency band and compatibility of multi-feed multi-band antennas, so that a multi-antenna structure can be arranged in a narrow space.

In order to save space, when the mobile communication device includes a metal shell, the radiator 1 can be formed by using the metal shell, that is, a part of the metal shell is used as the radiator 1 alone, and the part is insulated from the rest of the metal shell. This saves material and installation space. And because multiple antennas share a radiator 1, there is no need to cut the metal shell into multiple pieces, making the process simple and the structure neat.

As shown in FIG. 5, the metal case includes a metal back case 5 and a radiator 1, the metal back case 5 and the radiator 1 are insulated and connected, the metal back case 5 is a reference ground, and a ground point of the radiator 1 is connected to the ground The metal back shell 5 is connected. Therefore, the reference ground and the radiator 1 are formed at the same time by using the metal casing, thereby further saving installation space and material costs.

As shown in FIG. 5, the radiator 1 has a long structure and extends along the width direction of the mobile communication device, so that the radiator 1 can be designed to correspond to the width dimension of the metal back shell 5 to make the back structure of the mobile communication device. More compact and neat.

In order to make the connection between the metal back shell 5 and the radiator 1 more stable, as shown in FIG. 5, the first end 14 and the second end 15 of the radiator 1 can be formed into a bent portion, and the metal back shell 5 corresponds to the bent portion. A recessed portion is formed at a position, so that the bent portion is connected with the recessed portion to improve the stability of the connection.

It should be noted that the mobile communication device in the embodiment of the present application may be a communication device such as a mobile phone or a tablet computer capable of talking, which is not limited herein.

The above is only an implementation of this application, but the scope of protection of this application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application. Covered within the scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

A multi-antenna structure includes:

A radiator, the radiator including a first feeding point, a second feeding point, and a third feeding point, the second feeding point being located between the first feeding point and the third feeding point;

A first signal source electrically connected to a first feeding point of the radiator through a first matching circuit; and

A second signal source, the second signal source includes a first output terminal and a second output terminal, the first output terminal is connected to a third feeding point of the radiator through a second matching circuit, and the first The two signal sources further include a switch, the fixed end of the switch is connected to the second feeding point, and the active end of the switch is selectively connected to the ground or connected to the second output end. And a third matching circuit is provided between the second output terminal and the second output terminal,

When the changeover switch is switched to the first working position, the changeover switch communicates the second feed point of the radiator with the ground, and connects the second feed point of the radiator with the The third matching circuit is disconnected; when the changeover switch is switched to the second working position, the changeover switch communicates the second feeding point of the radiator with the third matching circuit and connects the radiation The second feed point of the body is disconnected from the ground.
The multi-antenna structure according to claim 1, wherein the first feeding point, the second feeding point, and the third feeding point are sequentially arranged along a same straight line direction.
The multi-antenna structure according to claim 2, wherein the radiator comprises a first end and a second end, the first end and the second end being connected to the first feed point and the second feed Point and the third feeding point are located on the same straight line, the first feeding point is disposed near the first end of the radiator, and the third feeding point is near the radiator. The second end is disposed, and a distance from the first feeding point to the first end of the radiator is equal to a distance from the third feeding point to the second end of the radiator.
The multi-antenna structure according to claim 2, wherein the radiator comprises a first end and a second end, the first end and the second end being connected to the first feed point and the second feed The point and the third feeding point are all located on the same straight line.
The multi-antenna structure according to claim 1, wherein:

The first signal source is connected to an antenna branch supporting a first frequency band,

The second signal source is connected to an antenna branch supporting the first frequency band,

The second signal source is connected to an antenna branch supporting a second frequency band, and the second frequency band is different from the first frequency band.
The multi-antenna structure according to claim 3, wherein when the switch is switched to the second working position, signals in the same frequency band of the first signal source and the second signal source pass through a time division multiplexing mode transmission.
The multi-antenna structure according to any one of claims 1 to 6, wherein the radiator is a monopole antenna, a PIFA antenna, or a LOOP antenna.
A mobile communication device includes the multi-antenna structure according to any one of claims 1 to 7.
The mobile communication device according to claim 8, wherein the mobile communication device comprises a metal case, and the radiator is a part of the metal case.
The mobile communication device according to claim 9, wherein the metal case comprises a metal back case and the radiator, the metal back case and the radiator are connected in an insulated manner, the metal back case is a reference ground, and the radiation The ground point of the body is connected to the metal back shell.
The mobile communication device according to claim 10, wherein the radiator is an elongated structure and extends along a width direction of the mobile communication device.
The mobile communication device according to claim 10, wherein two ends of the radiator form bent portions, and the metal back shell forms a recessed portion corresponding to the bent portion, and the bent portion and the recessed portion Mate connection.