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Transmission Line Input Impedance - ITTC

1/26/2005 Transmission line Input 1/9 Jim Stiles The Univ. of Kansas Dept. of EECS Transmission line Input Impedance Consider a lossless line , length A, terminated with a load ZL. Let s determine the Input Impedance of this line ! Q: Just what do you mean by Input Impedance ? A: The Input Impedance is simply the line Impedance seen at the beginning (z= A) of the Transmission line , : ()()()inVzZZzIz= == == AAA Note Zin equal to neither the load Impedance ZL nor the characteristic Impedance Z0 ! 0 and ininLZZZZ I(z) 0,Z + V (z) - + VL - A ZL IL z= A0z=1/26/2005 Transmission line Input 2/9 Jim Stiles The Univ.

1/26/2005 Transmission Line Input Impedance.doc 2/9 Jim Stiles The Univ. of Kansas Dept. of EECS To determine exactly what Z in is, we first must determine the voltage and current at the beginning of the transmission line (z=−A).

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