看作集中参数电路,用一个?型网络来等效。于是整个传输线可等效成无穷多个?型网络的级联. Sch.EIE Hefei Normal UniversitySch.EIE Hefei Normal University11/21/20169sR导体表面电阻复介电常数1( / )L H m1( / )C F m1( / )R m?1( / )G S mln2ba??2 / lnba???2 / lnba?????1 12sRa b?? ??? ?? ?2 2lnD D dd??? ?2 2/ lnD D dd??? ??2 2/ lnD D dd???? ???2sRd?dW?Wd??2sRWWd????j? ??? ??? ?双导线、同轴线和平行线传输线的分布参数Sch.EIE Hefei Normal UniversitySch.EIE Hefei Normal University11/21/201610二、传输线方程??????,, ,z tz z t z t zz?? ???? ??????????,, ,i z ti z z t i z t zz??? ????1)一般传输线方程或电报方程Sch.EIE Hefei Normal UniversitySch.EIE Hefei Normal University按泰勒级数展开,忽略高次项200000)(!2)())(()()(xxxfxxxfxfxf????????( )00( )( ) ( )!nnnf xx x R xn? ? ???