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+//Chapter 3: The Antenna Family
+//Example 3-11.1
+clc;
+
+//Variable Initialization
+n = 4               //Number of patch antennas (lambda)
+diameter = 0.5      //Diameter of patch antennas (lambda)
+
+//Calculation
+A_e = n*diameter            //Effective aperture (lambda^2)
+D = (4*%pi*A_e)         //Directivity (unitless)
+D_dbi = 10*log10(D)    //Directivity (dBi)
+ohm_a = (4*%pi)/D       //Beam area (steradians)
+
+//Result
+mprintf("The directivity is %d or %d dBi",D,D_dbi)
+mprintf("\nThe beam area is %.1f sr", ohm_a)