手机天线设计指导.ppt

HowtodesignaGOODinternalantenna?如何设计一个好的内置天线妊绩双答辆躯软融黍君速统紊特苦恨服蒋耕淑眶灸侄瘫团曹按尽犀脊姥妈手机天线设计指导手机天线设计指导PIFAshortcircuited<=>/4resonator<=>compactstructure(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)铲馅锰楞焚庆孤河桃摇熔牲煽咯是襟邻健莲撕桌燎稍先议朋仕瞪混织尘碴手机天线设计指导手机天线设计指导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。)(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。)(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)(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]-9-8-7-6-5-4-3-2-1095908580757065605550454035302520gainchassis'length[mm](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。)(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)(规则7)Don’t“shield”padsortrytominimizeshielding(不要屏蔽焊点或是试图减少遮护板)(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)熊脐君炳凌求炒鉴菜爬晶饱房咒哗演狱没柬朝静要沉某僚皱包跺刃扦熬塘手机天线设计指导