對印刷線路板進行適當的線路布局是解決輻射電磁幹擾(EMI)問(wen)題(ti)最(zui)省(sheng)錢(qian)的(de)方(fang)法(fa)。目(mu)前(qian)有(you)幾(ji)種(zhong)商(shang)業(ye)軟(ruan)件(jian)可(ke)以(yi)分(fen)析(xi)潛(qian)在(zai)的(de)板(ban)級(ji)電(dian)磁(ci)幹(gan)擾(rao)問(wen)題(ti)。不(bu)過(guo)，用(yong)軟(ruan)件(jian)並(bing)不(bu)一(yi)定(ding)可(ke)靠(kao)
，為(wei)優(you)化(hua)設(she)計(ji)，需(xu)要(yao)對(dui)樣(yang)品(pin)進(jin)行(xing)板(ban)級(ji)測(ce)試(shi)和(he)反(fan)複(fu)的(de)布(bu)線(xian)。

gengzhongyaodeshi，zaishuzizhuangzhidedianzidianlujiaoduo，shizhongsudujiaogaodeqingkuangxia，ruguobucaiqumouzhongxingshideyizhi，shiyongjiandandexianlubanbujuhennanjiejuedianciganraopingbiwenti。zaiyinshuaxianlubanshangzengjiaguolvqiheshuaijianqi

，yijicaiyongdaidulijiedicengdeduocengban，keyiyizhiyixiediancifushe。

圖題：多層電路板層麵剖視圖

不過，由於目前許多係統工作在800MHz以yi上shang，波bo長chang如ru此ci之zhi短duan，以yi致zhi許xu多duo線xian路lu板ban上shang的de電dian路lu走zou線xian恰qia好hao成cheng為wei四si分fen之zhi一yi或huo二er分fen之zhi一yi波bo長chang的de天tian線xian。因yin此ci大da多duo數shu高gao頻pin係xi統tong需xu要yao某mou種zhong形xing式shi的de板ban級ji電dian磁ci幹gan擾rao屏ping蔽bi（或封裝起來）。

板(ban)極(ji)屏(ping)蔽(bi)的(de)一(yi)般(ban)做(zuo)法(fa)是(shi)在(zai)印(yin)刷(shua)線(xian)路(lu)板(ban)的(de)輻(fu)射(she)元(yuan)件(jian)或(huo)敏(min)感(gan)元(yuan)件(jian)上(shang)安(an)裝(zhuang)金(jin)屬(shu)罩(zhao)。把(ba)金(jin)屬(shu)罩(zhao)焊(han)在(zai)線(xian)路(lu)板(ban)上(shang)是(shi)一(yi)個(ge)常(chang)用(yong)且(qie)有(you)效(xiao)的(de)屏(ping)蔽(bi)方(fang)法(fa)，而(er)且(qie)可(ke)以(yi)用(yong)插(cha)件(jian)機(ji)自(zi)動(dong)安(an)裝(zhuang)。不(bu)過(guo)焊(han)上(shang)金(jin)屬(shu)罩(zhao)後(hou)就(jiu)很(hen)難(nan)看(kan)到(dao)被(bei)屏(ping)蔽(bi)的(de)元(yuan)件(jian)了(le)。

一種新的屏蔽技術采用了薄金屬或金屬化塑料底板，它們的底板邊緣有一層直接模壓上去的低扣合力導電橡膠層。通過針、孔等定位裝置可以使它們精確地安裝在印刷線路板上。 xiangjiaocengyuxianlubanjinmikouhe，zaijiashangyinshuaxianlubandibanceng，keyiquanfangweipingbidianciganrao。weipingbineibuchuanrao，keyibajinshuhuasuliaozhaohuojinshuzhaofengekai。

haiyouyizhongleisidediancipingbifangfacaiyongledaidaodianxiangjiaocengdesuliaozhao。xiangjiaobeimoyazaisuliaozhaodeneibiaomianhecebi。xiangjiaohaikeyizuochengneibi
，zaiyikuaihuoduokuaiyinshuaxianlubandeganraodianluzhijianxingchengdiancigelikongjian。

有限元分析等工具keyiyouhuadaodianxiangjiaozaiyinshuaxianlubanpingbixitongzhongdeyingyong。youxianyuanfenxikeyiyouxiaodishejixiangjiaocengpoumian，yimanzuyinshuaxianlubansuoxudedikouheliyaoqiu。youxianyuanfenxikeyiduihoubeishejigainiantigongzhunquedeyuce，buxuyaotongguofanfushiyanlaijinxingyangpinpinggu。