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Transmission Lines & E M. Waves Prof. R. K. Shevgaonkar Department of Electrical Engineering Inian Instit!te of Technolog"# $om%a" Lect!re '( In this lecture, we solve few more problems of transmission lines but this time we are going to make use of the switch chart to solve this transmission line problems. Let us take a  problem of impedance measurement using the transmission line. (Refer Slide Time 0!"#$ %s we have seen earlier, the measurement of comple& impedance is ver' tedious at higher freuencies because the measurement of phase is unreliable. So the measurement of unknown impedance at higher freuencies is carried out b' measuring the standing wave ratio and the location of the standing wave pattern ma&imum or minimum, we calculate the unknown impedanc e. So here a set up we ar e ha vi ng a tr ansmiss ion li ne to which the unknown impedance is connected and b' using what is called a slotted transmission line to measure the standing wave pattern on the transmission line. So this is a variation of the voltage as a function of length on the transmission line. So we measure the parameters let us sa' the ma&imum voltage which we see on the transmission line is ) volts, the minimum voltage is which we see is ) volts the location of the first ma&imum is *# centimeters from the load end of the line and the distance between the *

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