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+// chapter 7 example 16
+//-----------------------------------------------------------------------------
+clc;
+clear;
+// given data
+D       = 3;        // Mouth diameter in m
+//f       = 2;        // focal length in m
+bw3db   = 63;      // 3dB beam width
+k       = 0.9;      // beam width is k times subtended angle
+
+// Calculations
+theta   = bw3db/k;  // subtended angle
+theta_r = theta
+//theta   = 4*atan(1/(4*f/D));
+f       = D/(4*tan((theta_r/4)*(%pi/180)));
+
+// Output
+mprintf('Distance of feed from the point of intersection of antenna axis and the reflector surface = %3.2f m',f);
+//------------------------------------------------------------------------------