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//chapter 2
//may june 2013
//Aem=Gdmax*lamda^2/4*pi;
printf("\n");
Gdmax=1.5;//for half wave dipole
f=10^9;
c=3*10^8;
lamda=c/f;
Aem=(Gdmax*(lamda)^2)/(4*(%pi));
printf("the effective aperture is %gm^2",Aem);