泄(xie)漏(lou)同(tong)軸電(dian)(dian)纜(lan)(Leaky Coaxial Cable)通(tong)常(chang)簡稱為泄(xie)漏(lou)電(dian)(dian)纜(lan)或漏(lou)泄(xie)電(dian)(dian)纜(lan),其主要(yao)工作原理是電(dian)(dian)磁波(bo)在(zai)泄(xie)漏(lou)電(dian)(dian)纜(lan)中(zhong)縱向(xiang)傳輸(shu)的同(tong)時通(tong)過槽孔(kong)向(xiang)外(wai)界輻射電(dian)(dian)磁波(bo);外(wai)界的電(dian)(dian)磁場也可通(tong)過槽孔(kong)感應到泄(xie)漏(lou)電(dian)(dian)纜(lan)內部并(bing)傳送到接收端。
漏(lou)泄同(tong)軸(zhou)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan),是(shi)一種特殊(shu)的(de)(de)(de)(de)同(tong)軸(zhou)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan),與(yu)普通同(tong)軸(zhou)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)的(de)(de)(de)(de)區(qu)別在于(yu):其外導體上開有用作輻(fu)射的(de)(de)(de)(de)周期性(xing)槽(cao)孔(kong)。普通同(tong)軸(zhou)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)的(de)(de)(de)(de)功(gong)能,是(shi)將(jiang)射頻能量從電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)的(de)(de)(de)(de)一端傳輸(shu)到電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)的(de)(de)(de)(de)另一端,并且希(xi)望有最大的(de)(de)(de)(de)橫(heng)向屏蔽,使信號能量不能穿透電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)以避免傳輸(shu)過(guo)程中(zhong)的(de)(de)(de)(de)損耗。但是(shi),漏(lou)泄電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)的(de)(de)(de)(de)設計(ji)目的(de)(de)(de)(de)則是(shi)特意減小橫(heng)向屏蔽,使得電(dian)(dian)(dian)(dian)(dian)(dian)磁能量可以部分地(di)從電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)內穿透到電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)外。當(dang)然,電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)外的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)磁能量也將(jiang)感應到電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)內。
泄露電纜主要(yao)適用(yong)于銀(yin)行(xing)、金庫、高(gao)級住宅、監(jian)獄、倉庫、博(bo)物館、電站(包(bao)括核電站)、軍事(shi)機關及設(she)施、基地、油田、文物保護和其它需要(yao)室外周邊防(fang)護的報警(jing)場所,也可作(zuo)為室內各種防(fang)護報警(jing)使用(yong)。
測試方案(an):fieldfox—ERTA
ERTA 可以用于測量射頻系統的標量傳輸增益或損耗。它對于測量兩端很難放置到一處的長有損電纜非常有用,例如固定在船舶或航空器上的電纜。它還適合測量波導系統的插入損耗,或使用頻偏功能測量混頻器和轉換器等器件。ERTA 測量需要使用兩臺 FieldFox 分析儀;它們分別布置在被測器件的兩端,一臺作為信號源和基準接收機(R),另一臺作為測量接收機(B)。這兩臺 FieldFox 通過硬件觸發同步。借助 FieldFox 分析儀所應用的 InstAlign 技術,您可以使用 ERTA 實施精確的增益或損耗測量。
主要特性與技術指標
長(chang)有(you)損電纜的標量測量。
使用頻偏功能(neng)的(de)轉換(huan)器(qi)標(biao)量(liang)測量(liang)。
測量:增益/損耗(hao)(B/R)、輸入功率(lv)(R)、輸出功率(lv)(B)。
需要兩臺(tai)FieldFox分析儀,每臺(tai)都配有ERTA選件(jian)和(he)附件(jian)。
ERTA系統頻(pin)率(lv)受(shou)每臺分析儀的頻(pin)率(lv)范(fan)圍的限制(zhi)(兩臺 N9918A 的頻(pin)率(lv)范(fan)圍為26.5GHz)。
典(dian)型的增(zeng)益/損耗(B/R)測量不確定度:± 0.7dB(f≤ 26.5GHz,頻(pin)率基準鎖定至GPS)。
典(dian)型動(dong)態范圍:86dB(f≤22GHz,頻(pin)率基準鎖定至GPS)。
典型最大可測量(liang)衰減:91dB(f≤22GHz,頻率基準(zhun)鎖(suo)定至GPS)。