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+//Chapter-9 example 3
+//=============================================================================
+clc;
+clear;
+//input data
+Da    = 0.15;//diameter of parabolic antenna in m
+F     = 9*10^9;//radar operating frequency in hz
+Vo    = 3*10^8;//velocity of EM wave in m/s
+
+//Calculations
+lamda = Vo/F;//wavelength
+Gp    = 6.4*(Da/lamda)^2//gain of parabolic reflector
+G     = 10*log10(Gp)//gain in dB
+NNBW  = 140*(lamda/Da);
+HPBW  = 70*(lamda/Da);//half power bandwidth in deg
+
+//Output
+mprintf('NNBW of parabolic reflector is %3.2f degrees\n HPBW of parabolic reflector is %3.2f degrees\n',NNBW,HPBW);
+
+mprintf(' Gain of parabolic reflector is %3.2f dB',G);
+
+//=============end of the program==============================================