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+// chapter 7 example 12
+//-----------------------------------------------------------------------------
+clc;
+clear;
+// given data
+Zi      = 72;       // input impedance in ohms
+// A    = 1.5a      // area of cross section in sq.cm
+// Zif  = Zi*[(sum of areas of cross section of various components)/(Area of cross section of the driven element )]^2
+// Zif  = 72*((a + 1.5a)/a)^2;
+// Zif  = 72*(2.5*a/a)^2;
+Zif     = 72*(2.5)^2;
+mprintf('Input impedance for a folded dipole = %d Ω',Zif);
+//------------------------------------------------------------------------------