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CN100356629C - Mobile-terminal multi-antenna system - Google Patents

Mobile-terminal multi-antenna system Download PDF

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Publication number
CN100356629C
CN100356629C CNB2005100120729A CN200510012072A CN100356629C CN 100356629 C CN100356629 C CN 100356629C CN B2005100120729 A CNB2005100120729 A CN B2005100120729A CN 200510012072 A CN200510012072 A CN 200510012072A CN 100356629 C CN100356629 C CN 100356629C
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antenna
antennas
plane
shaped
ground plane
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CN1710749A (en
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王非凡
杜正伟
王蔷
龚克
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Tsinghua University
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Tsinghua University
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Abstract

The present invention relates to a mobile terminal multi-antenna system which belongs to the field of mobile terminal multi-antenna design. The present invention is characterized in that the multi-antenna system is composed of two plane monopole antennas and two plane inversed F-shaped antennas, wherein the plane inversed F-shaped antennas are vertical to the plane monopole antennas; the vertical distance between two feed lines of the two plane monopole antennas is 15mm; the distance of a feed point of each plane inversed F-shaped antenna to a center line of a Z-axis direction of the dielectric plate of the two monopole antennas and the two plane inversed F-shaped antennas is 4mm; the distance of the upper edge of the plane inversed F-shaped antennas to the upper edge of a T-shaped ground plane is 26mm; the position of the plane inversed F-shaped antennas on the dielectric plate exists in the vertical upper part of the plane monopole antennas; a radiation unit in the plane inversed F-shaped antennas is adjacent to the tail ends of both sides of the dielectric plate and can be folded to the T-shaped ground plane. The present invention has the advantages of small dimension and large gain, and the correlation among antennas is small. The present invention accords with the requirements of mobile communication.

Description

Mobile-terminal multi-antenna system
Technical field
The invention belongs to the mobile terminal antenna design field, particularly a kind of mobile-terminal multi-antenna system structural design that is used at the complex communication environment.
Background technology
Antenna is the important component part of communication system, and its performance is to the function important influence of whole communication system.In existing mobile communication terminal, adopt an antenna usually as transmitting and receiving antenna.Mobile communication system is upgrading constantly on function, capacity, quality and service business, and mobile terminal antenna has been proposed more and more higher performance index requirement; Simultaneously, antenna system is usually operated under the complicated mobile communication environments, will be subjected to many-sided decline when electric wave is propagated aloft, and channel is subjected to Effect of Environmental such as landform, temperature, humidity.These aspects all can produce adverse influence to communication quality.Only adopt individual antenna to be difficult in and keep good performance in the complicated communication environments.Need to reach the requirement of higher transmission rate, limited frequency spectrum resources, abominable transmission environment, low transmitting power with multiple-input, multiple-output (MIMO) technology.
The structure of mimo systems as shown in Figure 1, this system adopts a plurality of antennas to be used for transmitting-receiving respectively at transmitting terminal and receiving terminal, can think further expanding of dual-antenna diversity.The principle that its is handled is that the data flow with serial is mapped as parallel convey, and correspondingly parallel signal stream synthetic serial data stream, by different antennae signal irrelevance in wireless channel distinguish again by received signal for receiving terminal.Receive the realization optimization process by many antenna emission multiple data streams and by many antennas, can realize very high capacity.This optimization process realizes by Space Time Coding and decoding.The Space Time Coding technology is to consider from the room and time territory that simultaneously design code word, its basic principle are the vectors that sends message bit stream simultaneously produced on a plurality of antennas, utilize the orthogonality of sequence that transmitting antenna sends to obtain to gain.
The advantage of mimo systems is under the mobile communication environments of complexity, can obtain transmission rate faster, higher channel capacity and the lower error rate.
The hardware supports of mimo systems is exactly a multiaerial system.The multiaerial system an urgent demand antenna that is used for portable terminal has low characteristics such as correlation between small size, broadband, high radiation efficiency, the easy of integration and antenna element.
Summary of the invention
The objective of the invention is to adopt the weak point of individual antenna performance in the existing mobile communication equipment, a kind of multiaerial system that is used for portable terminal is provided in order to overcome under the mobile communication environments of complexity.
The invention is characterized in:
Described multiaerial system contains:
Dielectric-slab, described dielectric-slab is rectangular;
T type ground level is made by the Copper Foil that is printed on described rectangle dielectric-slab lower surface;
The unit antenna of two planes, all constitute by the tortuous metal wire that is printed on described rectangle dielectric-slab upper surface, the Z direction that is distributed in described rectangle dielectric-slab upper surface respectively is the and arranged on left and right sides of y direction center line, the feeder line of described two unipole antennas is made of the metal micro-strip line that is printed on the same plane of described rectangle dielectric-slab, vertical range between the feed line of described two unipole antennas is 15mm, is positioned at the both sides of the center line of described rectangle dielectric-slab Z direction;
Two planar inverted-F antennas, each is made up of near an end and the road section surface of described rectangle dielectric-slab, the feeder pillar that is connected between described radiating element and the described rectangle dielectric-slab of described T type ground level Z direction center line radiating element, the described radiating element of connection; The radiating element of described each planar inverted-F antenna separately respectively with described two unipole antennas in corresponding one vertical, the distributing point of described each planar inverted-F antenna is apart from described rectangle dielectric-slab Z direction center line 4mm, the top edge of this planar inverted-F antenna is apart from the top edge 26mm of described T type ground level, this planar inverted-F antenna adopts coaxial feed, links to each other with described T type ground level with 50 ohm of coaxial fittings at the distributing point place.
Described mobile terminal antenna system, it is characterized in that: described planar inverted-F antenna is folded to ground level away from an end of described T type ground level Z direction center line.
In sum, basic characteristics of the present invention are: size is little, can be used for portable terminal; Correlation is little between the antenna element, satisfies the instructions for use of mimo system; Antenna gain is bigger, meets the mobile communication requirement; It is low to make simple cost.
Description of drawings
Fig. 1, the structure chart of mimo systems.
The structure of the multiaerial system of forming by four antenna elements that Fig. 2, the present invention propose.
The vertical view of the multiaerial system of forming by four antenna elements that Fig. 3, the present invention propose.
The vertical view of T type ground level in the multiaerial system of forming by four antenna elements that Fig. 4, the present invention propose.
The structure chart of the multiaerial system midplane type unipole antenna of forming by four antenna elements that Fig. 5, the present invention propose.
The structure chart of the multiaerial system midplane inverse-F antenna of forming by four antenna elements that Fig. 6, the present invention propose.
Fig. 7, the vertical view of Fig. 6 midplane inverse-F antenna.
Fig. 8, the modified model multiaerial system structure chart that the present invention proposes.
Fig. 9, the structure chart of the modified model planar inverted-F antenna that the present invention proposes.
Figure 10, the front view of the modified model planar inverted-F antenna that the present invention proposes.
Figure 11, the x-z plane H face directional diagram of four antenna elements among the present invention.Among the figure,------represents unipole antenna 1,---represent unipole antenna 2,---represent planar inverted-F antenna 1,---represent planar inverted-F antenna 2.
Embodiment
The present invention proposes a kind of multiaerial system of being made up of four antenna elements, and structural representation comprises unipole antenna, two planar inverted-F antennas (PIFA), a dielectric-slab and T type ground level of two planes as shown in Figure 2.Among Fig. 2, the 1st, T type ground level, the 2nd, dielectric-slab, the 3rd, first plane one pole antenna, 4 is second plane one pole antenna, the 5th, first planar inverted-F antenna, 6 is second planar inverted-F antenna, 7 is distributing points of 5, and 8 is distributing points of 6, and 9 is distributing points of 3,10 is distributing points of 4,11 is little bands of feed of 3, and 12 is little bands of feed of 4, and the overall size of four antennas is 68 * 30 * 6 (mm 3), the annexation of each several part is as follows: T shape ground level is that the Copper Foil that is printed on rectangle dielectric-slab lower surface is made.The unipole antenna of two planes is the tortuous metal wires that are printed on the dielectric-slab upper surface, and their feeder line is that the metal micro-strip line of printing at grade constitutes.Two unipole antenna feed line places are positioned at the both sides of dielectric-slab z direction center line at a distance of 15mm.Two PIFA directions are vertical with unipole antenna, be positioned in the both sides 4mm of unipole antenna top, dielectric-slab z direction center line, top edge is apart from T type ground level top edge 26mm, adopt coaxial feed, be connected with T type ground level with 50 ohm of coaxial connectors at the distributing point place, the short circuit face of PIFA links to each other with T shape ground level by the fluting on the dielectric-slab.
Ground level vertical view such as Fig. 4, size L g* W g=95 * 65 (mm 2), ground level is made up of the metal that is printed on the dielectric surface.
Structure such as Fig. 5 of plane one pole antenna form by being printed on the lip-deep zigzag Microstrip line of dielectric-slab, adopt microstrip-fed.
The structure of planar inverted-F antenna such as Fig. 6, this antenna adopt existing PIFA form, and the 13rd, coaxial feed, the 14th, short circuit face links to each other with T shape ground level; The 15th, radiating element links to each other with short circuit face; The 2nd, dielectric-slab; 13 are connected by 50 ohm of coaxial connectors with 2.
Among the present invention, two plane one pole antennas adopt the space diversity mode to reduce correlation, also adopt space diversity between two PIFA.Between plane one pole antenna and the PIFA, existing space diversity also has polarization diversity, makes full use of the space and polarization reduces correlation between the antenna element.Relative position between four antennas has guaranteed the performance of antenna system of the present invention.
The invention allows for the improving one's methods of structure shown in Figure 2, see Fig. 8.Comprise two plane one pole antennas, two improved PIFA, a dielectric-slab and a T type ground level.Two plane one pole antennas and T type ground level improve PIFA with identical shown in Fig. 2, and the radiating element end is folded to ground level.Among Fig. 8, the 1st, T type ground level, the 2nd, dielectric-slab, the 3rd, first plane one pole antenna, 4 is second plane one pole antenna, the 5th, first improved planar inverted-F antenna, 6 are second improves planar inverted-F antenna, and 7 is distributing points of 5, and 8 is distributing points of 6,9 is distributing points of 3, and 10 is distributing points of 4.The overall size of four antennas is 65 * 30 * 6 (mm 3).Lacked 3mm than structure width shown in Fig. 2, identical with the ground level width, be more suitable for being integrated in the portable terminal.The structure of this system and connected mode are with identical shown in Fig. 2: T shape ground level is that the Copper Foil that is printed on rectangle dielectric-slab lower surface is made.The unipole antenna of two planes is the tortuous metal wires that are printed on the dielectric-slab upper surface, and their feeder line is that the metal micro-strip line of printing at grade constitutes.Two unipole antenna feed line places are positioned at the both sides of dielectric-slab z direction center line at a distance of 15mm.Two PIFA directions are vertical with unipole antenna, being positioned in unipole antenna vertical direction, dielectric-slab z direction is the both sides 4mm of y direction center line, top edge adopts coaxial feed apart from T type ground level top edge 26mm, is connected with T type ground level with 50 ohm of coaxial connectors at the distributing point place.The short circuit face of PIFA links to each other with T shape ground level by the fluting on the dielectric-slab.
The structure of improved planar inverted-F antenna such as Fig. 9, the 18th, coaxial feed, the 19th, short circuit face links to each other with T shape ground level; The 20th, radiating element links to each other with short circuit face, is made up of with vertical two planes level; The 2nd, dielectric-slab; 18 are connected by 50 ohm of coaxial connectors with 2.
The present invention has following characteristics:
The first, in the present invention, multiaerial system is made up of four antennas, and is of a size of 65 * 30 * 6 (mm 3), meet the requirement of portable terminal miniaturization.
The second, in the present invention, the correlation between four antennas is less, meets the instructions for use of MIMO.
The 3rd, in the present invention, the unipole antenna of two planes and T type ground level all are printed on the pcb board, and PIFA makes with copper sheet, and it is low to make simple cost.
The present invention has designed a multiaerial system of being made up of four antennas that is used for portable terminal, comprises unipole antenna, two planar inverted-F antennas (PIFA), a dielectric-slab and T type ground level of two planes.And a kind of improvement to this system proposed, the structure that changes PIFA under the constant situation of other parts reaches better effect.The concrete structure of each several part is described below respectively:
T type ground level among the present invention is that to be printed on thickness be that 0.8mm, relative dielectric constant are 3.8, are of a size of L g* W g=95 * 65 (mm 2) the rectangle dielectric-slab on Copper Foil, the size of T type ground level is: W=4mm, W t=1mm, L Gt=23mm.
Plane one pole antenna among the present invention is that to be printed on thickness be that 0.8mm, relative dielectric constant are 3.8, are of a size of L g* W g=95 * 65 (mm 2) the rectangle dielectric-slab on the zigzag Microstrip line, adopt microstrip-fed.Antenna size: H=19mm, W m=10mm, L=17mm, W s=1mm, D=3mm, d=1mm, W At=2mm, W Feed=1.7mm.The distance D at two unipole antenna distributing point places mBe 15mm.
Planar inverted-F antenna among the present invention is by a rectangular radiation unit, and a short circuit plane and a coaxial feeder are formed the size of antenna: L Pifa=30mm, h Pifa=6mm, W Pifa=4mm, d=2mm.Two PIFA are at a distance of D f=8mm, this distance can be adjusted according to the size of portable terminal, and the isolation between big more two PIFA of distance is good more.PIFA is vertical with unipole antenna to be placed, apart from dielectric-slab edge H f=26mm.The relative position of these four antennas is to the very important effect that has of systematic function.
Also proposed the improvement to above-mentioned PIFA among the present invention, the end of PIFA vertically is folded to ground, PIFA is of a size of: L Pifa=27.5mm, h Pifa=6mm, h Pifal=4mm, W Pifa=4mm, d=2mm.The relative position of four antennas is constant.
Unipole antenna among the present invention can be replaced with the plane one pole antenna of other shapes.
Four antennas among the present invention all are operated in the 2GHz frequency range, and the size that changes unipole antenna and PIFA can change operating frequency.At the 2.03GHz frequency, the coefficient correlation of the multiaerial system after the improvement sees the following form:
Antenna Unipole antenna 1 Unipole antenna 2 Plane inverse-F antenna 1 Plane inverse-F antenna 2
Unipole antenna 1 unipole antenna 2 planar inverted-F antennas 1 - 0.001 - 0.001 0.04 - 0.036 0.03 0.007
Four antenna gains among the present invention meet the portable terminal instructions for use all greater than 1dB, and the gain of measuring at the 2.03GHz frequency sees the following form:
Antenna Unipole antenna 1 Unipole antenna 2 Plane inverse-F antenna 1 Plane inverse-F antenna 2
Gain 1.0175dB 1.423dB 1.5600dB 1.6785dB
The directional diagram of four antennas among the present invention is seen Figure 11, and the directional diagram of four antenna elements has complementary characteristic, can receive the incoming wave of different directions in the space, is applicable to mimo system.

Claims (2)

1、移动终端多天线系统，其特征在于，所述多天线系统含有：1. A mobile terminal multi-antenna system, characterized in that the multi-antenna system includes: 介质板，所述介质板呈矩形；a medium plate, the medium plate is rectangular; T型地平面，由印刷在所述矩形介质板下表面的铜箔制成；T-shaped ground plane, made of copper foil printed on the lower surface of the rectangular dielectric board; 两个平面型的单机天线，都由印刷在所述矩形介质板上表面的曲折金属线构成，分别分布在所述矩形介质板上表面的Z方向即纵轴方向中心线的左、右两侧，所述两单极天线的馈线由印刷在所述矩形介质板同一平面上的金属微带线构成，所述两个单极天线的馈电线间的垂直距离为15mm，位于所述矩形介质板Z方向的中心线的两边；Two planar stand-alone antennas are composed of meandering metal wires printed on the upper surface of the rectangular dielectric board, and are respectively distributed on the left and right sides of the Z direction on the upper surface of the rectangular dielectric board, that is, the center line in the longitudinal axis direction , the feeders of the two monopole antennas are composed of metal microstrip lines printed on the same plane of the rectangular dielectric plate, the vertical distance between the feeders of the two monopole antennas is 15mm, and they are located on the rectangular dielectric plate Both sides of the center line in the Z direction; 两个平面倒F天线，各由辐射单元、连接所述辐射单元靠近所述T型地平面Z方向中心线的一端与所述矩形介质板的短路面、连接于所述辐射单元与所述矩形介质板之间的馈线柱组成；所述各平面倒F天线的辐射单元各自分别与所述两个单极天线中相对应的一个垂直，所述各平面倒F天线的馈电点距所述矩形介质板Z方向中心线4mm，该平面倒F天线的上边缘距所述T型地平面的上边缘26mm，该平面倒F天线采用同轴馈电，在馈电点处用50欧姆同轴接头与所述T型地平面相连。Two planar inverted F antennas, each consisting of a radiating unit, connecting one end of the radiating unit close to the Z-direction center line of the T-shaped ground plane and the short-circuit surface of the rectangular dielectric plate, and connecting the radiating unit and the rectangular The feeder column between the dielectric plates is composed; the radiating elements of each of the planar inverted F antennas are respectively perpendicular to the corresponding one of the two monopole antennas, and the feeding point of each of the planar inverted F antennas is separated from the The Z-direction centerline of the rectangular dielectric plate is 4 mm, and the upper edge of the plane inverted F antenna is 26 mm from the upper edge of the T-shaped ground plane. The plane inverted F antenna adopts coaxial feeding, and a 50 ohm coaxial The header is connected to the T-shaped ground plane. 2、根据权利要求1所述的移动终端多天线系统，其特征在于：所述平面倒F天线远离所述T型地平面Z方向中心线的一端折向地平面。2. The mobile terminal multi-antenna system according to claim 1, characterized in that: the end of the planar inverted-F antenna away from the Z-direction center line of the T-shaped ground plane is bent towards the ground plane.
CNB2005100120729A 2005-07-01 2005-07-01 Mobile-terminal multi-antenna system Expired - Fee Related CN100356629C (en)

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Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7408511B2 (en) * 2006-01-31 2008-08-05 Accton Technology Corporation MIMO antenna configuration
CN101005291B (en) * 2007-01-19 2010-05-19 清华大学 Dual-frequency planar two-antenna system for mobile terminals
CN101030672B (en) * 2007-03-09 2014-09-24 清华大学 Mobile Terminal Four Antenna System
CN101471490B (en) * 2007-12-27 2013-04-24 宏达国际电子股份有限公司 Planar inverted F/monopole hybrid antenna and mobile communication device equipped with the antenna
CN101656346B (en) * 2009-07-23 2013-01-30 清华大学 Planar two-antenna system for mobile terminals
CN101640306B (en) * 2009-09-07 2013-03-06 清华大学 Antenna structure for mobile terminal
JP5323271B2 (en) * 2011-04-11 2013-10-23 パナソニック株式会社 ANTENNA DEVICE AND WIRELESS COMMUNICATION DEVICE
CN103187634B (en) * 2013-03-27 2016-06-22 华南理工大学 A MIMO antenna composed of multiple directional antennas
CN103441326B (en) * 2013-06-17 2015-10-28 清华大学 For the Plane-type broadband double-antenna system of mobile terminal
CN104733857A (en) * 2015-03-26 2015-06-24 电子科技大学 Miniaturized high-isolation dual-band MOMO antenna

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