qishishebeichuxianganraodewenti，shiyinweiwomenhushilelianggeyuanyin，yigeshidianlanshangxuyaolvbodedianciganraowangwangdoushipinlvhengaodediancixinhao，wulunshijieshoudaodekongjianganrao，haishishebeineichuandaodaodianlanshangdeganrao，erwomensuozuodedabufenlvbodianluduigaopinganraodelvboxiaoguodoushihenchade
，youyudianrongdeyinxiandiangan、空間的寄生參數等。另一個原因是，濾波器的安裝方式有問題，濾波器接地不良，濾波器的輸入輸出端有耦合、空間耦合將濾波器旁路掉等，進一步降低了濾波器的高頻濾波性能。

要獲得預期的效果，需要注意以下幾點：

一、高頻特性較好的濾波器件：sanduandianrongdejiegoufeichangteshu，yuqitadianrongqixiangbi
，zuidazuimingxiandequbieshitayousangenyinxian
，qizhongyigedianjishangyoulianggenyinxian。zheyangyigeweixiaodegaibian，queshidianrongqidelvboxiaoguofashenglehendadegaishan。putongdianrongdeyinxiandianganduiyudianrongdegaopinlvbodezuoyongshiyouhaide，ersanduandianrongqueqiaomiaodiliyongleyinxiandiangan
，gouchengleyigeTxingditonglvboqi。sanduandianrongdegaopinlvboxiaoguobiputongdianronggaishanlehenduo。ruguozaisanduandianrongdelianggenlianzaiyiqideyinxianshangfenbieanzhuangyigetieyangticizhu，zehuidadazengjiaT型濾波器的濾波效果。這就是我們常說的片狀濾波器。

二、濾波器良好的接地：buguanyongshenmeyangdeqijian，lvboqinenglianghaodejiedizheyidiandoushiyouqizhongyaode。jibianshisanduandianrongqi，ruguojiediyinxianguochang，yinxiandedianganyeshishifenyouhaide，huishilvboxingnengdadazhekou。duiyulvchuchamoganraodelvboqi
，zhiyaozaibuxianshibaozhengdengxiaochengdianrongdeyinxiandezouxianjinliangduanjiukeyile
，duiyulvchugongmoganraodelvboqi，haiyaobaozhengxianlubanyujixiangzhijiandejiedilianghao。yibankeyitongguodaodianbuchendianjiedi。lingwai，yongyuI/O接口濾波接地目的的地線要單獨安排，並且僅與線路板的其它地線在一點連接。當使用π型濾波電路時，這一點更重要。

三
、濾(lv)波(bo)器(qi)要(yao)並(bing)排(pai)安(an)裝(zhuang)
，不(bu)然(ran)已(yi)經(jing)濾(lv)波(bo)的(de)和(he)沒(mei)有(you)濾(lv)波(bo)的(de)，兩(liang)者(zhe)信(xin)號(hao)之(zhi)間(jian)極(ji)易(yi)發(fa)生(sheng)串(chuan)擾(rao)
，致(zhi)使(shi)總(zong)體(ti)濾(lv)波(bo)失(shi)效(xiao)。當(dang)需(xu)要(yao)濾(lv)波(bo)的(de)引(yin)線(xian)較(jiao)多(duo)時(shi)，使(shi)用(yong)多(duo)路(lu)濾(lv)波(bo)器(qi)。

四、濾波器與機箱上電纜接口之間的引線要盡可能短
，或者可以加一個隔擋層。