同軸電纜屏蔽層的作用
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來源:金環宇電線發布日期(qi):2020-03-20 11:36
屏蔽層的(de)作用為(wei)防干擾,防電磁。
同(tong)(tong)軸(zhou)(zhou)(zhou)電(dian)(dian)纜(lan)(lan)(lan)從用(yong)(yong)途(tu)上分(fen)(fen)(fen)可分(fen)(fen)(fen)為基(ji)(ji)帶(dai)同(tong)(tong)軸(zhou)(zhou)(zhou)電(dian)(dian)纜(lan)(lan)(lan)和(he)(he)寬帶(dai)同(tong)(tong)軸(zhou)(zhou)(zhou)電(dian)(dian)纜(lan)(lan)(lan)(即(ji)網(wang)絡(luo)同(tong)(tong)軸(zhou)(zhou)(zhou)電(dian)(dian)纜(lan)(lan)(lan)和(he)(he)視頻同(tong)(tong)軸(zhou)(zhou)(zhou)電(dian)(dian)纜(lan)(lan)(lan))。同(tong)(tong)軸(zhou)(zhou)(zhou)電(dian)(dian)纜(lan)(lan)(lan)分(fen)(fen)(fen)50Ω 基(ji)(ji)帶(dai)電(dian)(dian)纜(lan)(lan)(lan)和(he)(he)75Ω寬帶(dai)電(dian)(dian)纜(lan)(lan)(lan)兩類。基(ji)(ji)帶(dai)電(dian)(dian)纜(lan)(lan)(lan)又分(fen)(fen)(fen)細同(tong)(tong)軸(zhou)(zhou)(zhou)電(dian)(dian)纜(lan)(lan)(lan)和(he)(he)粗同(tong)(tong)軸(zhou)(zhou)(zhou)電(dian)(dian)纜(lan)(lan)(lan)。基(ji)(ji)帶(dai)電(dian)(dian)纜(lan)(lan)(lan)僅(jin)僅(jin)用(yong)(yong)于數字傳輸,數據(ju)率可達10Mbps。
同(tong)軸電(dian)(dian)(dian)纜(lan)(Coaxial Cable)是(shi)指有(you)兩(liang)個(ge)同(tong)心導(dao)體(ti),而導(dao)體(ti)和屏蔽層(ceng)又(you)共(gong)用同(tong)一(yi)軸心的電(dian)(dian)(dian)纜(lan)。最常(chang)見的同(tong)軸電(dian)(dian)(dian)纜(lan)由絕緣(yuan)材(cai)(cai)料隔離的銅線導(dao)體(ti)組成,在里層(ceng)絕緣(yuan)材(cai)(cai)料的外部是(shi)另(ling)一(yi)層(ceng)環形導(dao)體(ti)及其絕緣(yuan)體(ti),然后整個(ge)電(dian)(dian)(dian)纜(lan)由聚氯乙烯或特(te)氟綸材(cai)(cai)料的護套包住。
同軸(zhou)電(dian)纜主(zhu)要(yao)(yao)(yao)用在微波(bo)傳輸(shu)中,這是(shi)一種很高(gao)速的(de)(de)一種數據(ju),民用較常見主(zhu)要(yao)(yao)(yao)用于(yu)有線電(dian)視和(he)網(wang)絡連(lian)接(jie)中,其最(zui)主(zhu)要(yao)(yao)(yao)作用是(shi)內(nei)導體(ti)與外導體(ti)的(de)(de)尺(chi)寸配(pei)合(he),以實現(xian)準確地阻(zu)抗匹配(pei),使功率(lv)的(de)(de)傳輸(shu)效(xiao)率(lv)達到(dao)較高(gao)的(de)(de)水平,這通(tong)常是(shi)針(zhen)對(dui)頻(pin)率(lv)高(gao)于(yu)10MHz的(de)(de)信號而言。
還有一個顯然的作(zuo)用,就(jiu)是屏(ping)蔽外界的干擾,使(shi)外界空間(jian)的各種雜散信號被隔(ge)離在(zai)屏(ping)蔽層(ceng)外,使(shi)信號完整無失真,使(shi)數據無錯誤。
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