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+//Chapter-9 example 14
+//=============================================================================
+clc;
+clear;
+//input data
+
+HPBW  = 6;//Half power Beamwidth in degrees
+
+//Calculations
+NNBW  = 2*HPBW;//Null to Null beamwidth in degrees
+//HPBW = 70*(lamda/Da);
+//(70/HPBW)= (Da/lamda);
+Gp    = 6.4*(70/HPBW)^2//gain of parabolic reflector
+G     = 10*log10(Gp)//gain in dB
+
+
+//Output
+mprintf('Gain of parabolic reflector is %3.2f dB\n NNBW of the antenna is %g degrees',G,NNBW);
+
+//=============end of the program==============================================