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+//Chapter 2: Antenna Basics
+//Example 2-10.2
+clc;
+
+//Variable Initialization
+R_r = 73                            //Radiation resistance (ohm)
+
+//Calculation
+eff_aper = 30/(R_r*%pi)         //Effective aperture (lambda squared)
+directivity = 4*%pi*eff_aper    //Directivity (unitless)
+
+//Result
+mprintf("The effective aperture is %.2f lambda square",eff_aper)
+mprintf("\nThe directivity is %.2f",directivity)