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+//Chapter-9 example 5
+//=============================================================================
+clc;
+clear;
+//input data
+F     = 6*10^9;//radar operating frequency in hz
+Vo    = 3*10^8;//velocity of EM wave in m/s
+NNBW  = 5;//Null to Null beamwidth
+
+//Calculations
+lamda = Vo/F;//wavelength
+
+Da  = 140*(lamda/NNBW);
+HPBW  = 70*(lamda/Da);//half power beamwidth in deg
+Gp    = 6.4*(Da/lamda)^2//gain of parabolic reflector
+G     = 10*log10(Gp)//gain in dB
+
+//Output
+mprintf('Mouth Diameter of paraboloid is %g m\n HPBW of parabolic reflector is %g degrees\n',Da,HPBW);
+
+mprintf(' Gain of parabolic reflector is %g dB\n Gain of parabolic reflector is %g ',G,Gp);
+
+//=============end of the program==============================================