如何設(shè)計(jì)一個(gè)好的內(nèi)置天線(xiàn)(手機(jī))

HowtodesignaGOODinternalantenna?

如何設(shè)計(jì)一個(gè)好的內(nèi)置天線(xiàn)

PIFAshortcircuited<=>

/4resonator<=>compactstructure（短接電路<=>

/4諧振片<=>緊湊的結(jié)構(gòu)）omnidirectionalinhorizontalplane（水平面的全方向性）co-andcrosspolarisations（同向和交叉極化）Multiresonant（多諧的）NumberONErule(首要規(guī)則)Whendesigninganykindofsmallantennaforthemobilephone,it’simportanttostartdesigningtheantennaTOGETHERwiththeantennamanufacturerinveryearlystatetoachievethebestpossibleperformance,andwhenconcerninginternalantennasthisisevenMOREimportant（在設(shè)計(jì)任何種類(lèi)的移動(dòng)電話(huà)天線(xiàn)時(shí)，為了得到盡可能最好的性能，和天線(xiàn)制造商在最初階段一起開(kāi)始設(shè)計(jì)天線(xiàn)是很重要的，這對(duì)于內(nèi)置天線(xiàn)來(lái)說(shuō)尤為重要。）RuleNo.2（規(guī)則2）Useallspaceyouhave:BIGsizeisbeautifulwhenconcerningantenna’sperformance（使用盡可能多的空間：對(duì)于天線(xiàn)的性能來(lái)講，尺寸越大越好。）RuleNo.3（規(guī)則3）Payspecialattentiontoantenna’sheight(distancebetweenradiatorandground)<=>BANDWIDTH!（請(qǐng)密切注意天線(xiàn)的高度（發(fā)射片和接地片的距離）<=>帶寬）RuleNo.4（規(guī)則4）Alsothelengthofthechassishasaremarkableeffectontheperformanceoftheantenna手機(jī)的長(zhǎng)度對(duì)于天線(xiàn)的性能有著顯著的影響Verticallypolarisedgain[dBi]-9-8-7-6-5-4-3-2-1095908580757065605550454035302520gainchassis'length[mm]RuleNo.5（規(guī)則5）KeepALLmetalsasfaraspossiblefromtheantenna,atleastasfarasgroundplaneis（所有的金屬應(yīng)盡可能的遠(yuǎn)離天線(xiàn)，至少象接地片一樣遠(yuǎn)。）RuleNo.6（規(guī)則6）Locatefeedingandshortcircuitingpadsneartheedgeofthegroundplane(phone’sPCB).ForspringcontactsthedistancebetweenbendingpointandPCB-padshouldbe4…5mm.（把饋點(diǎn)和短接電路點(diǎn)接近于接地片的邊緣（手機(jī)的PCB板），對(duì)于彈簧片接觸來(lái)說(shuō)，彎折點(diǎn)和PCB焊點(diǎn)的距離應(yīng)為4…5毫米）RuleNo.7（規(guī)則7）Don’t“shield”padsortrytominimizeshielding（不要屏蔽焊點(diǎn)或是試圖減少遮護(hù)板）RuleNo.8（規(guī)則8）Lettheradiator’sedges“see”freeedgeofgroundplaneasmuchaspossible,maybeevenreachoverthegroundplane’sedge（發(fā)射片的邊緣盡可能接近接地片的邊緣，甚至發(fā)射片可以超出接地片的邊緣）RuleNo.9（規(guī)則9）Allmetalsofthechassishavetobeproperlygroundedtoavoidpowerlossesandadditionalnon-radiatingresonances.PayspecialattentiontoRF-gaskets.（手機(jī)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。）RuleNo.10(規(guī)則10)Letthespacebetweenradiatorandgroundplanebefilledwithairasmuchas