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// chapter 7 example 6
//-----------------------------------------------------------------------------
clc;
clear;
// given data
D = 3; // diameter of the antenna in m
n_l = 0.7; // length efficiency
nr = 0.9; // radiation efficiency
f = 10*10^9; // antenna operating freq.
c = 3*10^8; // vel of EM waves in m/s
// calculations
def = D*n_l // Effective diameter
lamda = c/f // wavelength in m
Beam_w = lamda/def // beamwidth in radian
Beam_w_d= Beam_w*180/%pi; // beam width in degree;
n_a = n_l * n_l; // Aperture efficiency
AA = (%pi*D*D)/4; // actual area in sq m
Ae = AA*n_a; // Effective aperture
G = (4*%pi*Ae)/(lamda^2); // Gain
G_db = 10*log10(G);
// Output
mprintf('Beam Width = %3.2f degrees\n Effective Aperture = %3.2fsq m\n Gain = %3.1f dB',Beam_w_d,Ae,G_db);
//-------------------------------------------------------------------------------
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