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clc;
close();
clear();
//page no 552
//prob no. 17.3
c=3*10^8; //speed of light in m/s
f=3.7*10^9; //Hz
lembda=c/f; //m
mprintf('The wave length is %.4f cm \n',lembda*100)
theta_3dB=8; //degree
D=70*lembda/theta_3dB //m
mprintf('The diameter is, D= %.4f m \n',D);
eta_1=.6; //illumination efficiency
G=eta_1*(%pi*D/lembda)^2; //gain calculation
mprintf('The Gain is G= %.2f \n',G)
G_dB=10*log10(G); //dB gain
mprintf('The Gain in dB is G(dB)= %.3f dB \n',G_dB)
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