How to design a GOOD internal antenna? 如何设计一个好的内置天线 CONFIDENTIAL

PIFA short circuited <=> /4 resonator <=> compact structure （短接电路 <=> /4 谐振片<=>紧凑的结构） omnidirectional in horizontal plane （水平面的全方向性） co- and crosspolarisations （同向和交叉极化） Multiresonant （多谐的） CONFIDENTIAL

Number ONE rule (首要规则) When designing any kind of small antenna for the mobile phone, it’s important to start designing the antenna TOGETHER with the antenna manufacturer in very early state to achieve the best possible performance, and when concerning internal antennas this is even MORE important （在设计任何种类的移动电话天线时，为了得到尽可能最好的性能，和天线制造商在最初阶段一起开始设计天线是很重要的，这对于内置天线来说尤为重要。） CONFIDENTIAL

Rule No. 2 （规则 2） Use all space you have: BIG size is beautiful when concerning antenna’s performance （使用尽可能多的空间： 对于天线的性能来讲， 尺寸越大越好。） CONFIDENTIAL

Rule No. 3 （规则 3） Pay special attention to antenna’s height (distance between radiator and ground) <=> BANDWIDTH! （请密切注意天线的高度（发射片和接地片的距离） <=> 带宽） CONFIDENTIAL

Rule No. 4 （规则 4） Also the length of the chassis has a remarkable effect on the performance of the antenna 手机的长度对于天线的性能有着显著的影响 Vertically polarised gain [dBi] chassis' length [mm] -1 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 -2 -3 -4 gain -5 -6 -7 -8 -9 CONFIDENTIAL

Rule No. 5 （规则 5） Keep ALL metals as far as possible from the antenna, at least as far as ground plane is （所有的金属应尽可能的远离天线，至少象接地片一样远。） CONFIDENTIAL

Rule No. 6 （规则 6） Locate feeding and short circuiting pads near the edge of the ground plane (phone’s PCB). For spring contacts the distance between bending point and PCB-pad should be 4…5 mm. （把馈点和短接电路点接近于接地片的边缘（手机的PCB板），对于弹簧片接触来说，弯折点和PCB焊点的距离应为4…5毫米） CONFIDENTIAL

Rule No. 7 （规则 7） Don’t “shield” pads or try to minimize shielding （不要屏蔽焊点或是试图减少遮护板） CONFIDENTIAL

Rule No. 8 （规则 8） Let the radiator’s edges “see” free edge of ground plane as much as possible, maybe even reach over the ground plane’s edge （发射片的边缘尽可能接近接地片的边缘，甚至发射片可以超出接地片的边缘） CONFIDENTIAL

Rule No. 9 （规则 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. （手机的所有金属必须正确的接地，避免能量损失，和附加的不辐射的谐振。关注射频垫圈。） CONFIDENTIAL

Rule No. 10 (规则 10) Let the space between radiator and ground plane be filled with air as much as possible, in other words use as little support material as possible （使发射片和接地片之间的空间尽可能多地被空气填充，即使用尽可能少的支撑物。） CONFIDENTIAL