手机内置天线

CONFIDENTIAL HowtodesignaGOODinternalantenna 如何设计一个好的内置天线 CONFIDENTIAL PIFA shortcircuited 4resonatorcompactstructure 短接电路 4谐振片紧凑的结构 omnidirectionalinhorizontalplane 水平面的全方向性 co andcrosspolarisations 同向和交叉极化 Multiresonant 多谐的 CONFIDENTIAL NumberONErule 首要规则 Whendesigninganykindofsmallantennaforthemobilephone it simportanttostartdesigningtheantennaTOGETHERwiththeantennamanufacturerinveryearlystatetoachievethebestpossibleperformance andwhenconcerninginternalantennasthisisevenMOREimportant 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 RuleNo 2 规则2 Useallspaceyouhave BIGsizeisbeautifulwhenconcerningantenna sperformance 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 RuleNo 3 规则3 Payspecialattentiontoantenna sheight distancebetweenradiatorandground BANDWIDTH 请密切注意天线的高度 发射片和接地片的距离 带宽 CONFIDENTIAL RuleNo 4 规则4 Alsothelengthofthechassishasaremarkableeffectontheperformanceoftheantenna手机的长度对于天线的性能有着显著的影响 Verticallypolarisedgain dBi 9 8 7 6 5 4 3 2 1 0 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 gain chassis length mm CONFIDENTIAL RuleNo 5 规则5 KeepALLmetalsasfaraspossiblefromtheantenna atleastasfarasgroundplaneis 所有的金属应尽可能的远离天线 至少象接地片一样远 CONFIDENTIAL RuleNo 6 规则6 Locatefeedingandshortcircuitingpadsneartheedgeofthegroundplane phone sPCB ForspringcontactsthedistancebetweenbendingpointandPCB padshouldbe4 5mm 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 RuleNo 7 规则7 Don t shield padsortrytominimizeshielding 不要屏蔽焊点或是试图减少遮护板 CONFIDENTIAL RuleNo 8 规则8 Lettheradiator sedges see freeedgeofgroundplaneasmuchaspossible maybeevenreachoverthegroundplane sedge 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 RuleNo 9 规则9 Allmetalsofthechassishavetobeproperlygroundedtoavoidpowerlossesandadditionalnon radiatingresonances PayspecialattentiontoRF 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 RuleNo 10 规则10 Letthespacebetweenradiatorandgroundplanebefilledwithair