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+//Chapter-9 example 24
+//=============================================================================
+clc;
+clear;
+//input data
+F     = 600*10^6;//radar operating frequency in hz
+Vo    = 3*10^8;//velocity of EM wave in m/s
+D     = 1.644;//Directivity of the half wave dipole
+//Calculations
+lamda = Vo/F;//wavelength
+Ae    = (lamda^2*D)/(4*%pi);//effective area of antenna
+//Output
+mprintf('Effective Area of the antenna is %3.4f m^2',Ae);
+
+//=============end of the program==============================================