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+//Chapter-9 example 12
+//=============================================================================
+clc;
+clear;
+//input data
+
+F     = 4*10^9;//radar operating frequency in hz
+Vo    = 3*10^8;//velocity of EM wave in m/s
+NNBW  = 8;//Null to Null beamwidth in degrees 
+//Calculations
+lamda = Vo/F;//wavelength
+Da    = (140*lamda)/NNBW;
+A     = (%pi*Da*Da)/4;//Area of antenna
+Ac    = 0.65*A;//capture area
+
+//Output
+mprintf('\n Mouth diameter of parabolic reflector is %3.3f m \n Capture area is %3.2f m^2',Da,Ac);
+
+//=============end of the program==============================================