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+clc
+thetaH=17.3;..//beamwidth in E plane
+thetaE=17.3;..//beamwidth in H plane
+eta=0.5;..//antenna's efficiency
+c=3*10^8;
+f=4.5*10^9;
+lambda=c/f;
+A=(78*lambda/thetaH);..//aperture dimension in H plane
+B=(54*lambda/thetaE);..//aperture dimension in E plane
+G=10*log10(eta*4*%pi*A*B/lambda^2);
+disp("m",A,"Aperture dimension in H plane");
+disp("m",B,"Aperture dimension in E plane");
+disp("dB",G,"Gain"); \ No newline at end of file