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+// chapter 7 example 6
+//-----------------------------------------------------------------------------
+clc;
+clear;
+// given data
+D       = 3;        // diameter of the antenna in m
+n_l     = 0.7;      // length efficiency
+nr      = 0.9;      // radiation efficiency
+f       = 10*10^9;  // antenna operating freq.
+c       = 3*10^8;   // vel of EM waves in m/s
+
+// calculations
+def     = D*n_l    // Effective diameter
+lamda   = c/f      // wavelength in m
+Beam_w  = lamda/def // beamwidth in radian
+Beam_w_d= Beam_w*180/%pi;       // beam width in degree;
+n_a     = n_l * n_l;    // Aperture efficiency
+AA      = (%pi*D*D)/4;  // actual area in sq m
+Ae      = AA*n_a;       // Effective aperture
+G       = (4*%pi*Ae)/(lamda^2); // Gain
+G_db    = 10*log10(G);
+
+// Output
+mprintf('Beam Width = %3.2f degrees\n Effective Aperture = %3.2fsq m\n Gain = %3.1f dB',Beam_w_d,Ae,G_db);
+//-------------------------------------------------------------------------------