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+//Chapter-9 example 1
+//=============================================================================
+clc;
+clear;
+//input data
+Da    = 2.5;//diameter of parabolic antenna in m
+F     = 5*10^9;//radar operating frequency in hz
+Vo    = 3*10^8;//velocity of EM wave in m/s
+
+//Calculations
+lamda = Vo/F;//wavelength
+NNBW  = 140*(lamda/Da);
+HPBW  = 70*(lamda/Da);//half power beamwidth in deg
+
+//Output
+mprintf('NNBW of parabolic reflector is %g degrees\n HPBW of parabolic reflector is %g degrees',NNBW,HPBW);
+
+//=============end of the program==============================================