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+//chapter-10 page 489 example 10.10
+//==============================================================================
+clc;
+clear;
+
+//For a parabolic antenna
+Gp=1500;//Power gain
+w=0.1;//wavelength in m
+
+//CALCULATION
+D=sqrt(Gp)*(w/(%pi));//Diameter of the circular mouth of a parabolic antenna in m
+HPBW=58*(w/D);//Half Power BeamWidth of the antenna in deg
+
+//OUTPUT
+mprintf('\nDiameter of the circular mouth of a parabolic antenna is D=%1.4f m \nHalf Power BeamWidth of the antenna is HPBW=%1.3f deg',D,HPBW);
+
+//=========================END OF PROGRAM===============================