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// chapter 7 example 16
//-----------------------------------------------------------------------------
clc;
clear;
// given data
D = 3; // Mouth diameter in m
//f = 2; // focal length in m
bw3db = 63; // 3dB beam width
k = 0.9; // beam width is k times subtended angle
// Calculations
theta = bw3db/k; // subtended angle
theta_r = theta
//theta = 4*atan(1/(4*f/D));
f = D/(4*tan((theta_r/4)*(%pi/180)));
// Output
mprintf('Distance of feed from the point of intersection of antenna axis and the reflector surface = %3.2f m',f);
//------------------------------------------------------------------------------
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