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+//Chapter-9 example 6
+//=============================================================================
+clc;
+clear;
+//input data
+F     = 9*10^9;//radar operating frequency in hz
+Vo    = 3*10^8;//velocity of EM wave in m/s
+NNBW  = 5;//Null to Null beamwidth
+Da    = 5;//diameter of antenna in m
+
+//Calculations
+lamda = Vo/F;//wavelength
+A     = (%pi*Da*Da)/4;//actural area of antenna
+Ac    = 0.65*A;//Capture Area
+
+D     = 6.4*(Da/lamda)^2;//directivity of antenna
+D1     = 10*log10(D)//gain in dB
+HPBW  = 70*(lamda/Da);//half power beamwidth in deg
+NNBW  = 2*HPBW;//null to null beamwidth 
+
+//Output
+mprintf('HPBW of parabolic reflector is %g degrees\n NNBW of parabolic reflector is %g degrees\n Directivity is %g dB\n Capture area is %g m^2',HPBW,NNBW,D1,Ac);
+
+
+//=============end of the program==============================================