如何設(shè)計一個好的內(nèi)置天線

1、Done by/Filtronic LK OyDateCONFIDENTIALHow to design a GOOD internal antenna?如何設(shè)計一個好的內(nèi)置天線Done by/Filtronic LK OyDateCONFIDENTIALPIFA short circuited /4 resonator compact structure （短接電路 /4 諧振片緊湊的結(jié)構(gòu)） omnidirectional in horizontal plane （水平面的全方向性） co- and crosspolarisations （同向和交叉極化） Multiresonant （多諧

2、的）Done by/Filtronic LK OyDateCONFIDENTIALNumber ONE rule (首要規(guī)則) When designing any kind of small antenna for the mobile phone, its important to start designing the antenna TOGETHER with the antenna manufacturer in very early state to achieve the best possible performance, and when concerning interna

3、l antennas this is even MORE important （在設(shè)計任何種類的移動電話天線時，為了得到盡可能最好的性能，和天線制造商在最初階段一起開始設(shè)計天線是很重要的，這對于內(nèi)置天線來說尤為重要。）Done by/Filtronic LK OyDateCONFIDENTIALRule No. 2 （規(guī)則 2） Use all space you have: BIG size is beautiful when concerning antennas performance （使用盡可能多的空間： 對于天線的性能來講， 尺寸越大越好。）Done by/Filtronic LK

4、 OyDateCONFIDENTIALRule No. 3 （規(guī)則 3） Pay special attention to antennas height (distance between radiator and ground) BANDWIDTH! （請密切注意天線的高度（發(fā)射片和接地片的距離） 帶寬）Done by/Filtronic LK OyDateCONFIDENTIALRule No. 4 （規(guī)則 4） Also the length of the chassis has a remarkable effect on the performance of the antenna

5、 手機的長度對于天線的性能有著顯著的影響Vertically polarised gain dBi-9-8-7-6-5-4-3-2-1095908580757065605550454035302520gainchassis length mmDone by/Filtronic LK OyDateCONFIDENTIALRule No. 5 （規(guī)則 5） Keep ALL metals as far as possible from the antenna, at least as far as ground plane is （所有的金屬應(yīng)盡可能的遠離天線，至少象接地片一樣遠。）Done by

6、/Filtronic LK OyDateCONFIDENTIALRule No. 6 （規(guī)則 6） Locate feeding and short circuiting pads near the edge of the ground plane (phones PCB). For spring contacts the distance between bending point and PCB-pad should be 45 mm. （把饋點和短接電路點接近于接地片的邊緣（手機的PCB板），對于彈簧片接觸來說，彎折點和PCB焊點的距離應(yīng)為45毫米）Done by/Filtronic L

7、K OyDateCONFIDENTIALRule No. 7 （規(guī)則 7） Dont “shield” pads or try to minimize shielding （不要屏蔽焊點或是試圖減少遮護板）Done by/Filtronic LK OyDateCONFIDENTIALRule No. 8 （規(guī)則 8） Let the radiators edges “see” free edge of ground plane as much as possible, maybe even reach over the ground planes edge （發(fā)射片的邊緣盡可能接近接地片的邊緣

8、，甚至發(fā)射片可以超出接地片的邊緣）Done by/Filtronic LK OyDateCONFIDENTIALRule No. 9 （規(guī)則 9） All metals of the chassis have to be properly grounded to avoid power losses and additional non-radiating resonances. Pay special attention to RF-gaskets. （手機的所有金屬必須正確的接地，避免能量損失，和附加的不輻射的諧振。關(guān)注射頻墊圈。）Done by/Filtronic LK OyDateCONFIDENTIALRule No. 10 (規(guī)則 10) Let the space between radiator and ground plane be fil