WO2012122740A1

WO2012122740A1 - Terminal

Info

Publication number: WO2012122740A1
Application number: PCT/CN2011/074352
Authority: WO
Inventors: 刘建富
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-03-15
Filing date: 2011-05-19
Publication date: 2012-09-20
Also published as: CN202068419U

Abstract

A terminal is disclosed, which includes an antenna. The antenna is arranged on a Printed Circuit Board of said terminal. In the relative technique a steel sheet or a Flexible Printed Circuit Board(FPC) is used in the antenna for attaching to a bracket and the molds for the bracket and antenna need to be prepared, which lead to a problem of high cost. The problem is solved by the technical solution provided in present invention. Then the cost is saved, and the radiation efficiency of the antenna is improved.

Description

FIELD OF THE INVENTION The present invention relates to communication terminals or, in particular, to a terminal. BACKGROUND With the development of 3G and 4G technologies, high-speed Internet surfing through data cards has become an increasingly popular lifestyle for consumers. To ensure high download and upload rates, the USB modem must have good reception performance. The antenna is an interface for wireless data exchange between the mobile terminal and the base station, and its performance is especially important. In the 4G Worldwide Interoperability for Microwave Access (WIMAX) technology, the antenna used is usually a Multiple Input Multiple Output (MIMO) antenna. MIMO technology is an important breakthrough in next-generation communication technology. It uses MIMO multi-antenna technology to exchange electromagnetic wave energy into space to reduce multipath fading of signals. Among the built-in antennas used in current USB modem products, the antennas are mostly monopole antennas or IFA antennas. These antennas are easy to achieve wider bandwidth and better radiation performance, but most of them use bracket structures, antennas釆Attached to the bracket with a steel sheet or FPC. This requires mold opening for the bracket and antenna, which is costly. In addition, since the lumped components are lossy, increasing the matching circuit increases the loss, and the radiation efficiency of the descending antenna. The utility model relates to the antenna steel sheet or the flexible printed circuit board (FPC) attached to the bracket in the related art, and the mold and the antenna need to be opened, which causes a high cost problem. The new type provides a terminal to solve at least one of the above problems. According to the present invention, a terminal is provided. The terminal according to the present invention includes: a multiple input multiple output (MIMO) antenna, and the above MIMO antenna is disposed on a printed circuit board (PCB) in the terminal. The above terminal is one of the following: USB modem, mobile terminal device. The terminal is a USB modem, and the MIMO antenna includes: a main antenna and a diversity antenna; the main antenna is located at a clearance area of the PCB end of the USB modem; and the diversity antenna is located at the PCB side end of the USB modem. Clearance area. The above diversity antenna is located at the edge of the side end of the PCB. The feed points of the above main antenna and the above diversity antenna are placed diagonally on the PCB. The main antenna has a step-by-step widening structure along the RF test socket. The narrowest structure line width of the above main antenna is 0.31 mm. The above-mentioned main antenna and/or the above-mentioned diversity antenna adopt a single-stage sub-antenna wiring method. The above MIMO antenna has a meandering structure in the clearance area of the above PCB. The above MIMO antenna uses a single-stage sub-antenna routing method. Through the utility model, the antenna of the terminal is disposed on a printed circuit board (PCB) in the terminal, and the related art is that the antenna steel sheet or the FPC is attached to the bracket, and the bracket and the bracket are needed. The antenna opens the mold, which causes a high cost problem, which in turn can save costs and improve the radiation efficiency of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate, FIG. Improperly qualified. 1 is a schematic diagram of an antenna layout of a USB modem according to a preferred embodiment of the present invention; FIG. 2 is a schematic diagram of a main antenna according to a preferred embodiment of the present invention; FIG. 3 is a preferred embodiment of the present invention. 4 is a graph of return loss of a main antenna according to a preferred embodiment of the present invention; and FIG. 5 is an antenna layout diagram of a mobile terminal device according to a preferred embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. According to an embodiment of the present invention, a terminal is provided. The terminal according to the present invention includes: a MIMO antenna, wherein the MIMO antenna is disposed on a PCB of the terminal. In a preferred implementation, the MIMO antenna can be printed directly onto the PCB. The antenna of the terminal is disposed on the printed circuit board in the terminal (for example, directly printed on the circuit board), and the related art is that the antenna steel sheet or the FPC is attached to the bracket, and the bracket and the antenna need to be opened, resulting in The problem of high cost can save costs and increase the radiation efficiency of the antenna. The terminal may be not only a data card type terminal (for example, a USB modem) but also a mobile terminal device (for example, a mobile phone). The antenna layout of the USB modem is described below in conjunction with FIG. 1 is an antenna layout diagram of a USB modem in accordance with a preferred embodiment of the present invention. As shown in FIG. 1, the antenna of the USB modem includes: a main antenna 1 and a diversity antenna 2; wherein, the main antenna is located at a clearance area at the end of the PCB of the USB modem; and the diversity antenna is located at a clearance area of the PCB side of the USB modem. In the implementation process, in order to realize the functions of USB modem diversity transmission and reception, the efficiency of the primary and secondary antennas should be as close as possible. For example, the antenna efficiency values usually differ by no more than 10%. Preferably, as shown in FIG. 2, the main antenna 1 has a gradual structure which is gradually widened along the radio frequency test socket 3. The width from point A to point D is divided into two levels and gradually widened. Starting from point D, the main antenna radiator is gradually widened in a taper shape, and the current is more evenly distributed on the radiator. The main antenna forms a structure similar to a single-cone antenna, and the ideal single-cone antenna has ultra-wideband characteristics. The main antenna of the utility model inherits this feature and realizes broadband characteristics. In a preferred implementation, the narrowest structure (AB segment) line width of the main antenna 1 described above can generally be set to 0.31 mm. Preferably, due to the limitation of the external dimensions, the auxiliary antenna clearance area is narrow, and the main antenna and/or the diversity antenna may be in the form of an elongated monopole antenna. Since the main antenna is in the form of a monopole antenna with a gradual structure, the working bandwidth is broadened. Preferably, the diversity antenna is located at the edge of the side end of the PCB. As shown in FIG. 3, the diversity antenna 2 is placed on the edge of the PCB as much as possible, and the distance from the shield 4 can be increased to ensure the radiation performance of the antenna. Preferably, the feed points of the primary antenna 1 and the diversity antenna 2 are placed diagonally on the PCB. Through the above processing, the isolation between the main antenna and the diversity antenna can be increased, and the traces coming out from the RF test socket can be kept as short as possible to avoid introducing more losses. As shown in FIG. 4, the return loss of the main antenna 1 is less than -5 dB between 3G and 4G. Table 1 shows the results of the over-the-air (Over the Air, OTA for short) radiation performance of the main antenna (Antl) and the diversity antenna (Ant2) of the USB modem. As shown in Table 1, both the main antenna and the diversity antenna have higher radiation. effectiveness. Table 1

Through the above embodiment, the main antenna and the diversity antenna are directly printed on the circuit board, and the main antenna adopts a gradation structure, which increases the bandwidth of the antenna, does not need to increase the matching circuit, and greatly improves the radiation efficiency of the antenna. In addition, since the distance of the PCB antenna from the housing is farther than that of the bracket antenna, it is also advantageous to reduce the electromagnetic absorption ratio (SAR) of the antenna. The antenna layout of a mobile terminal type device (e.g., a mobile phone) will be described below with reference to FIG. As shown in Fig. 5, the antenna 5 of the mobile phone has a serpentine structure in the clearance area of the printed circuit board (PCB). Preferably, the antenna 5 is wired with a single-stage sub-antenna. In a preferred implementation, the PCB antenna is located at the bottom of the handset and printed directly to the handset motherboard 6. For the convenience of debugging, the position of the matching circuit 7 can be increased near the antenna feeding point. The antenna uses the monopole antenna in the form of a trace. Because the antenna clearance area is narrow, the antenna can be routed on the main board, and the space of the clearance area can be utilized as much as possible. When the model simulation is established, the liquid crystal panel 8, the battery 9 and the main board 6 which have an influence on the antenna performance are considered. After simulation, the antenna can cover the bandwidth of the GSM900 band very well. In summary, with the above embodiments provided by the present invention, the antenna is disposed on the printed circuit board (PCB) along with the PCB line, and the antenna bracket is not needed, thereby saving processing costs. In addition, since the PCB antenna is used, the distance between the antenna and the outer casing is smaller than that in the case of the bracket, so the SAR value of the terminal is lowered, and the damage to the human body is weakened. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed among multiple computing devices. On the network, optionally, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from The steps shown or described are performed sequentially, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. For those skilled in the art, various modifications and changes can be made in the present invention. Any modifications, equivalent substitutions, improvements, etc. within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

1. A terminal comprising: a multiple input multiple output MIMO antenna,

The MIMO antenna is disposed on a printed circuit board PCB in the terminal.

The terminal according to claim 1, wherein the terminal is one of the following: a USB modem, a mobile terminal device.

The terminal according to claim 2, wherein the terminal is a USB modem, and the MIMO antenna comprises: a primary antenna and a diversity antenna;

The main antenna is located at a clearance area of the PCB end of the USB modem; the diversity antenna is located at a clearance area of the PCB side end of the USB modem.

The terminal according to claim 3, wherein the diversity antenna is located at an edge of the side end of the PCB.

The terminal according to claim 3, wherein feed points of the main antenna and the diversity antenna are diagonally placed on the PCB.

The terminal according to claim 3, wherein the main antenna has a step-by-step widening structure along the radio frequency test socket.

7. The terminal according to claim 6, wherein the narrowest structure line width of the main antenna is 0.31 mm.

The terminal according to any one of claims 3 to 7, wherein the main antenna and/or the diversity antenna are wired in a single-stage sub-antenna.

9. The terminal according to claim 2, wherein the terminal is a mobile terminal device, and the MIMO antenna has a meandering structure in a clearance area of the PCB.

10. The terminal according to claim 9, wherein the MIMO antenna adopts a single-stage sub-antenna routing mode.