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+//Chapter-9 example 7
+//=============================================================================
+clc;
+clear;
+//input data
+Da    = 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
+R     = (2*Da*Da)/lamda;//min distance b/w antennas
+//Output
+mprintf('Minimum distance Required is %g m',R);
+
+//=============end of the program==============================================