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// Chapter 3 example 7
//------------------------------------------------------------------------------
clc;
clear;
// in the first case when the line is lamda/2 long, the i/p impedance is same as the load resistance
Zl = 300; // load resistance in ohm
Zo = 75; // charecteristic impedance in ohm
// calculations
//Zi = Zo*((Zl + iZotanβl)/(Zo + iZltanβl))
// = Zo*(((Zl/tanβl) + iZo))/((Zl/tanβl) + iZo)))
// for l = lamda/2 βl = (2* π/lamda)*(lamda/2) = π
// therefore tanβl = 0 which gives Zi = Zl
// in the second case when the operating frequency is halved, the wavelength is douβled which means the same line is now lamda/4 long
// for l = lamda/4 ,βl = (2* π/lamda)*(lamda/4) = π/2
// therefore tanβl = ∞
Zi = (Zo^2)/Zl; // input impedance
mprintf('Input impedance = %3.2f ohm',Zi);
//------------------------------------------------------------------------------
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