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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);
+//------------------------------------------------------------------------------
+