如何设计一个好的内置天线(手机)

HowtodesignaGOODinternalantenna?

如何设计一个好的内置天线

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）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。）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。）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）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]-9-8-7-6-5-4-3-2-1095908580757065605550454035302520gainchassis'length[mm]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。）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）RuleNo.7（规则7）Don’t“shield”padsortrytominimizeshielding（不要屏蔽焊点或是试图减少遮护板）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）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。）RuleNo.10(规则10)Letthespacebetweenradiatorandgroundplanebefilledwithairasmuchas