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+//Chapter-9 example 8
+//=============================================================================
+clc;
+clear;
+//input data
+
+F = 4*10^9;//radar operating frequency in hz
+Vo = 3*10^8;//velocity of EM wave in m/s
+Gp = 500;//power gain of antenna
+//Calculations
+lamda = Vo/F;//wavelength
+Da = lamda*(Gp/6.4)^0.5//diameter of parabolic antenna in m
+
+NNBW = 140*(lamda/Da);//beamwidth b/w null to null
+HPBW = 70*(lamda/Da);//half power beamwidth in deg
+
+//Output
+mprintf('NNBW of parabolic reflector is %3.2f degrees\n HPBW of parabolic reflector is %3.2fdegrees\n',NNBW,HPBW);
+
+mprintf(' Mouth diameter of parabolic reflector is %3.2f m',Da);
+
+//=============end of the program==============================================