//Ex:4.9
clc;
clear;
close;
printf("Aperture=10y*10y");
printf("\n then, G=(4.5*10y*10y)/(y^2)");
printf("\n and finally, G=4.5*100");
G=4.5*100;// power gain of optimum horn antenna
printf("\n The power gain of optimum horn antenna = %d", G);