WO2014161331A1

WO2014161331A1 - Antenna apparatus for terminal device

Info

Publication number: WO2014161331A1
Application number: PCT/CN2013/087982
Authority: WO
Inventors: 王小明; 谢一泓; 李龙; 史琰; 刑珺; 张璐; 孙浩
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-07-23
Filing date: 2013-11-27
Publication date: 2014-10-09
Also published as: CN104347925A; CN104347925B

Abstract

Disclosed is an antenna apparatus for a terminal device, comprising an antenna support and an antenna topology unit. The antenna support is located at a surface of a non-metal region of a terminal device motherboard. The antenna topology unit is arranged surrounding the non-metal region of the terminal device motherboard and the antenna support. A feeder port of the antenna topology unit is connected to a radio frequency signal output port provided by the terminal device motherboard. A grounding port of the antenna topology unit is metallically connected to the terminal device motherboard. The apparatus of the present invention implements work performance of high gain and high efficiency of the LTE band in the premise of only occupying an area of a small part of a non-metal region at the top of a terminal device motherboard, breaks a limit that the size of a conventional antenna has to reach a half of the work wavelength to perform resonance work, meets requirements of miniaturization and high performance of a resonant antenna, and is applicable to a variety of terminal type products.

Description

Antenna device for terminal equipment

The present invention relates to the field of wireless communication and telecommunications technologies, and in particular, to an antenna device for a terminal device. Background technique

With the rapid development of wireless communication and telecommunications technologies, wireless terminal devices such as mobile phones and tablets, and wireless data cards as wireless data transceivers between terminal devices and networks require high-speed data transmission and better portability. . At the same time, with the continuous evolution of communication systems,

Since the formal introduction of the LTE (Long Term Evolution) system, the degree of development from a theoretical concept to a certain mature scale has been realized. As an evolution scheme of the next generation communication system, the LTE system satisfies people's requirements for high communication rate and low delay. Therefore, it is necessary to cover the working band of the new LTE system for the antenna of the terminal device to be wirelessly communicated. The focus of research in this field.

Most of the existing wireless mobile terminals use antennas such as a monopole antenna, a PIFA (Planar Inverted-F Antenna), and a loop antenna. If these antennas are to work in the frequency band to be covered, the physical size will be large, and the bandwidth of a single type of antenna cannot meet the working requirements of wireless mobile terminal communication. At present, for the design of the antenna to cover the LTE frequency band, not only the return loss of the antenna, but also the antenna performance such as gain and efficiency are good, and the size of the antenna is required to be as small as possible. According to the antenna principle, the conventional antenna size needs to reach one-half or one-quarter of the working wavelength to work resonantly. This is difficult for a wireless mobile terminal that is originally small in size to find a suitable space for placing these antennas. The use of conventional antenna forms does not meet the antenna requirements for wireless data transmission. Therefore, how to ensure that the antenna has a miniaturized and high-performance working state in a small-sized wireless mobile terminal is an urgent problem to be solved. Summary of the invention

The technical problem to be solved by the embodiments of the present invention is to provide an antenna device for a terminal device, which can meet the requirements of the terminal device for miniaturization and high performance of the antenna.

The technical solution adopted by the embodiment of the present invention is an antenna device of a terminal device, including an antenna bracket and an antenna topology unit. The antenna bracket is located on one side of the non-metal area of the terminal device main board, and the antenna topology unit surrounds the terminal device main board. Non-metallic areas and antenna brackets are laid.

The feed port of the antenna topology unit is connected to the radio frequency signal output port provided by the terminal device main board, and the ground port of the antenna topology unit is connected to the metal ground of the terminal device main board.

The antenna topology unit comprises: a plane bending line, a three-dimensional bending line, a patch and a conductive connecting component, wherein the patch and the plane bending line are respectively located on two different printed circuit layers on the terminal device main board, and the plane bending line passes through the conductive The connecting member is connected to the patch, and either end of the plane bending line is connected to the metal ground of any printed circuit layer in the terminal device motherboard;

The three-dimensional bending line is located on any printed circuit layer of the main board of the terminal device, and one end of the three-dimensional bending line is connected as a feeding port to the RF signal output port provided on the printed circuit layer, and the plane is bent around the shape of the patch and left. There is a gap, and after the three-dimensional bending around the antenna bracket, the other end is suspended.

Wherein, the patch and the planar bending line are separately disposed, and are respectively located on the top layer printed circuit layer and the bottom printed circuit layer on the main board of the terminal device.

In the process of transmitting, the radio frequency signal on the main board of the terminal device is fed from the feeding port to the three-dimensional bending line, so that the three-dimensional bending line excites the working current, and the working current is coupled through the gap between the three-dimensional bending line and the patch. In the patch, a part of the working current in the patch flows into the plane bending line through the conductive connecting member, and another working current is coupled into the plane bending line through the gap between the patch and the plane bending line, and the current in the plane bending line Go back to the metal ground of the terminal board.

Wherein, the conductive connecting member is a metalized via. The antenna holder is a cube having at least one side aligned with a side of the non-metallic area of the terminal device main board. The material of the antenna bracket is propylene-butadiene-benzenediene copolymer ABS plastic; the plane bending line, the three-dimensional bending line and the patch are all made of a metal material. Adjust the frequency.

With the above technical solution, the embodiment of the present invention has at least the following advantages:

The antenna device of the terminal device in the embodiment of the present invention implements LTE band 12 (698MHz-746MHz), LTE band 13 (746MHz-787MHz), and GSM 850 under the premise that only a small portion of the non-metal area on the top of the terminal board is occupied. The high-gain and high-efficiency performance of the /900 (824MHz-960MHz) band breaks the limitation that the traditional antenna size must reach one-half of the working wavelength to achieve resonance operation, which meets the requirements of miniaturization and high performance of the resonant antenna. Applicable to a variety of terminal products. DRAWINGS

1 is a schematic structural diagram of an antenna apparatus of a terminal device according to an embodiment of the present invention;

2 is a schematic structural diagram of an antenna device of a terminal device according to an embodiment of the present invention; FIG. 3 is an equivalent circuit diagram of an antenna device of a terminal device according to an embodiment of the present invention;

4 is a S11 parameter diagram of an antenna device according to an embodiment of the present invention when applied to a smart phone; FIG. 5 is a schematic structural view of an antenna device applied to a main board of a wireless data card according to an embodiment of the present invention;

6 is a schematic structural diagram of an antenna device applied to a main board of a wireless data card according to an embodiment of the present invention;

7 is a S11 parameter diagram when the antenna device is applied to a wireless data card according to an embodiment of the present invention; FIG. 8 is a radiation efficiency of the antenna device applied to a wireless data card according to an embodiment of the present invention; Peak gain curve. DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.

An antenna device of a terminal device, as shown in FIG. 1, includes an antenna support 1 and an antenna topology unit. The antenna support 1 is a cube located on one side of the non-metal area 2 of the terminal device main board, such as the terminal device in FIG. Below the non-metal area 2 of the main board, or below the non-metal area 2 of the terminal board, at least one side of the antenna holder 1 is aligned with the side of the non-metal area 2 of the terminal board. The material of the antenna holder 1 can be ABS plastic. The metal area 3 of the terminal board contains a plurality of printed circuit layers.

2 is a detailed structural diagram of an antenna device of a terminal device. As shown in FIG. 2, the antenna topology unit is disposed around the non-metal area 2 of the terminal device board and the antenna bracket 1 , and the feeding port 3 of the antenna topology unit is connected to the RF signal output port provided by the terminal board, and the antenna topology is The ground port 4 of the unit is connected to the metal ground of the terminal board.

The antenna topology unit comprises: a plane bending line 5, a three-dimensional bending line 6, a patch 7 and a conductive connecting member 8, the patch 7 and the plane bending line 5 are respectively located on two different printed circuit layers on the terminal device main board, the plane bending line 5 is connected to the patch 7 through the conductive connecting member 8, and either end of the plane bending line 5 is connected to the metal ground of any printed circuit layer in the terminal board; the conductive connecting member 8 may be a metalized via. The plane bending line 5, the three-dimensional bending line 6 and the patch 7 are all made of a metal material.

The three-dimensional bending line 6 is located on any printed circuit layer of the main board of the terminal device, and one end of the three-dimensional bending line 6 is connected as a feeding port 3 to the RF signal output port provided on the printed circuit layer, and is planarly curved around the shape of the patch. Folding and leaving a gap, while the side of the antenna holder 1 aligned with the side of the non-metallic area 2 of the terminal board is three-dimensionally bent around the antenna holder 1, the other end is suspended. The size, length, height and height of the antenna holder 1 can be adjusted according to the area occupied by the three-dimensional bending line 6. The length of the three-dimensional bending line 6 and the plane bending line 5 can be based on the day The operating frequency of the line device is adjusted.

For ease of processing, preferably, the patch 7 and the planar bending line 5 are respectively located on the top printed circuit layer and the lower printed circuit layer of the terminal device main board. Alternatively, the patch 7 and the planar bend line 5 are respectively located on the lower printed circuit layer and the top printed circuit layer on the terminal device main board.

Based on the antenna device of the terminal device of the embodiment of the present invention described above, during the transmitting process, the radio frequency signal on the main board of the terminal device is fed from the feeding port 3 to the three-dimensional bending line 6, so that the three-dimensional bending line 6 excites the working current. The working current is coupled into the patch 7 through a gap between the three-dimensional bending line 6 and the patch 7. A part of the operating current in the patch 7 flows into the plane bending line 5 through the conductive connecting member 8, and another working current passes through the patch. The gap between the plane 7 and the plane bending line 5 is coupled into the plane bending line 5, and the current in the plane bending line 5 flows back to the metal ground of the terminal board to form a complete resonant circuit.

3 is an equivalent circuit diagram of the antenna device of the terminal device according to the embodiment. As shown in FIG. 3, the three-dimensional bending line 6 can be equivalent to the first distributed inductance L1 and the radiation resistance Rrad, and the three-dimensional bending line 6 and the patch 7 The first coupling capacitor C12 is generated; the conductive connecting member 8 and the plane bending line 5 can be equivalent to the second distributed inductor L23; the patch 7 and the plane bending line 5 generate the first equivalent capacitance C23 and the radiation admittance Grad, while bending The interline gap of the planar fold line 5 may form a second equivalent capacitance C3. The resonance state of the entire antenna device can be controlled by appropriately adjusting the sizes of L1, C12, L23, C23, and C3. In the implementation, by optimizing the shape and size of the three-dimensional bending line 6 in the antenna device structure, the size of the coupling gap between the three-dimensional bending line 6 and the patch 7 is optimized, the shape and size of the patch 7 are optimized, and the length of the plane bending line 5 is optimized. The width and the position and diameter of the metallized vias allow adjustment of the resonant characteristics and matching state of the antenna device and ultimately reach the full coverage target bandwidth.

Two applications of the antenna device of the embodiment of the present invention are listed below.

1) The antenna device of the embodiment of the present invention is applied to a motherboard of a smart phone, as shown in FIG. 4 is a S11 parameter diagram of an antenna device according to an embodiment of the present invention applied to a smart phone. It can be seen that the smart phone antenna in this embodiment covers the required LTE band 12 (698 MHz-746 MHz) and LTE band 13 ( 746MHz-787MHz) and GSM 850/900 (824MHz-960MHz) band, and can work normally.

2) The antenna device of the embodiment of the present invention is applied to the main board of the wireless data card, as shown in Figs.

The wireless data card includes a motherboard and a USB connector 11, and is connected to a device such as a PC through a USB connector 11 at the end. The motherboard of the wireless data card is a double-layer copper-clad dielectric board made of FR4 (glass fiber epoxy resin copper clad). The top of the motherboard of the wireless data card has a non-metallic area 2 left to the antenna topology unit and the antenna bracket 1 The remaining area of the main board on which the non-metal area 2 is removed is a metal ground, and the top layer of the wireless data card main board and the metal ground of the bottom layer are co-located. The antenna bracket 1 is placed under the non-metallic area 2 at the top of the wireless data card motherboard. The antenna bracket 1 is made of ABS plastic with a relative dielectric constant of 3.5. The size of the antenna bracket 1 is 11.5mmx20mmx5mm.

In order to meet the requirements of miniaturization of wireless data card products, the antenna is designed in the form of a local resonant structure. The antenna topology unit is divided into three parts, wherein the first part is a three-dimensional bending line with a total length of 67 mm, printed on the top surface of the double-layer copper-clad dielectric board and the antenna holder 1; the second part of the antenna topology unit is a size A rectangular patch 7 of 17.5 mm x 6 mm is printed on the top surface of the double-layer copper-clad dielectric board; the third part of the antenna topology unit is a plane bending line 5 with a line width of 0.7 mm and a total length of 56 mm, printed on the double-layer copper-clad dielectric board. On the bottom surface; the patch 7 and the plane bending line 5 are connected by a conductive connecting member 8, and the conductive connecting member 8 is penetrated through the double-layer copper-clad dielectric plate. The shape of the three-dimensional bending line 6 may also be other than the shape shown in FIG. 6 or FIG. 2, and all of them are metal strips or strips, and the specific shape thereof may be adjusted according to the result of actual debugging. The shape of the top patch 7 of the cell unit may be any shape such as a rectangle, a diamond, a trapezoid, a triangle, a polygon, or the like, and is not limited to the shape shown in FIG. 6 or 2. Flat in the antenna topology unit The width, length and spacing of the surface bending lines 5 can be appropriately adjusted, and the position of the conductive connecting member 8 can be changed as long as the patch 7 and the plane bending line 5 are electrically connected, and the diameter of the conductive connecting member 8 can also be Change according to requirements. The length, width and height of the antenna holder 1 can be adjusted according to the area occupied by the three-dimensional bending line 6, and are not limited to the size in this embodiment.

7 is a S11 parameter diagram of an antenna device according to an embodiment of the present invention applied to a wireless data card. It can be seen that the wireless data card antenna covers the required LTE band 12 (698 MHz-746 MHz) and LTE band 13 (746 MHz- 787MHz) and GSM 850/900 (824MHz-960MHz) bands.

8 is a radiation efficiency and peak gain curve of an antenna device according to an embodiment of the present invention applied to a wireless data card. As shown in FIG. 8, the wireless data card antenna in the embodiment of the present invention has a working bandwidth of 684 MHz to 960 MHz. The radiation efficiency is greater than 40%, and the peak gain is greater than 0dBi, so it has the characteristics of high efficiency and high gain, and meets the requirements of high performance of the antenna.

The antenna device of the terminal device in the embodiment of the present invention implements LTE band 12 (698MHz-746MHz), LTE band 13 (746MHz-787MHz), and GSM under the premise of occupying a part of the non-metal area at the top of the terminal board. The high-gain and high-efficiency performance of the 850/900 (824MHz-960MHz) band breaks the limitation that the traditional antenna size must reach one-half of the working wavelength to achieve resonance operation, meeting the requirements of miniaturization and high performance of the resonant antenna. , Suitable for all kinds of terminal products.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

claims

1. An antenna device for terminal equipment, including an antenna bracket and an antenna topology unit. The antenna bracket is located on one side of the non-metallic area of the terminal equipment mainboard. The antenna topology unit is arranged around the non-metallic area of the terminal equipment mainboard and the antenna bracket.

2. The antenna device of terminal equipment according to claim 1, wherein the feed port of the antenna topology unit is connected to the radio frequency signal output port provided by the terminal equipment mainboard, and the grounding port of the antenna topology unit is connected to the terminal equipment mainboard. The metal ground is connected.

3. The antenna device of terminal equipment according to claim 2, wherein the antenna topology unit includes: a planar bending line, a three-dimensional bending line, a patch and a conductive connection component, and the patch and the planar bending line are respectively located on the terminal equipment There are two different printed circuit layers on the motherboard. The planar bending line is connected to the patch through a conductive connecting component. Either end of the planar bending line is connected to the metal ground of any printed circuit layer on the terminal equipment motherboard;

The three-dimensional bending line is located on any printed circuit layer of the terminal equipment motherboard. One end of the three-dimensional bending line serves as a feed port and is connected to the RF signal output port provided on the printed circuit layer. It is bent flat around the shape of the patch and remains. There is a gap, and after three-dimensional bending around the antenna bracket, the other end is suspended in the air.

4. The antenna device of the terminal equipment according to claim 3, wherein the patch and the plane bending line are arranged separately, and are respectively located on the top printed circuit layer and the bottom printed circuit layer on the main board of the terminal equipment.

5. The antenna device of the terminal equipment according to claim 3, wherein during the transmission process, the radio frequency signal on the main board of the terminal equipment is fed into the three-dimensional bending line from the feed port, so that the three-dimensional bending line excites the operating current, The working current is coupled into the patch through the gap between the three-dimensional bending line and the patch. Part of the working current in the patch flows into the plane bending line through the conductive connecting component, and the other part of the working current passes through the gap between the patch and the plane bending line. The gap couples into the planar bend line, and the current in the planar bend line returns to the metal ground of the terminal device motherboard.

6. The antenna device of the terminal equipment according to claim 3, wherein the conductive connection component is a metallized via hole.

7. The antenna device of terminal equipment according to claim 1, wherein the antenna bracket is a cube, at least one side of which is aligned with the side of the non-metallic area of the main board of the terminal equipment.

8. The antenna device for terminal equipment according to claim 1, wherein the size of the antenna bracket is adjusted according to the area occupied by the three-dimensional bending line.

9. The antenna device of the terminal equipment according to claim 1, wherein the material of the antenna bracket is propylene-butadiene-styrene copolymer ABS plastic;

The plane bending lines, three-dimensional bending lines and patches are all made of metal materials.

10. The antenna device of the terminal equipment according to any one of claims 1 to 9, wherein: is adjusted.