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+//chapter 2
+//part a
+printf("\n");
+c=3*10^8;
+f=10^9;
+lamda=c/f;
+printf("the wavelength is %gm",lamda);
+//part b
+dl=3*10^-2;
+Rrad=80*(%pi)^2*(dl/lamda)^2;
+printf("\nthe radiation resistance is %gohm",Rrad);
+//part c
+Gdmax=1.5//Gd=1.5sin^2(theta),where theta=90 for short dipole
+n=0.6;
+Gp=n*Gdmax;
+printf("\nthe antenna gain is given by %g",Gp);
+//part d
+Ae=1.5*(lamda)^2/(4*(%pi));
+printf("\nthe effective aperture is %gm^2",Ae);