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// Chapter 3 example 20
//------------------------------------------------------------------------------
clc;
clear;
// Given data
a = 4*10^-2; // width of waveguide
b = 2*10^-2; // narrow dimension of waveguide
c = 3*10^8; // velocity of EM wave in m/s
d = 4*10^-2; // distance b/w field maxima and minima
// Calculations
lamda_c = 2*a; // cut-off wavelength in dominant mode
lamda_g = 4*d; // guide wavelength
// lamda_g = lamda0/(sqrt(1 - (lamda0/lamda_c)^2))
lamda0 = sqrt((lamda_c * lamda_g)^2 / (lamda_c^2 + lamda_g^2));
f0 = c/lamda0; // frequency of the wave
// Output
mprintf('Frequency of the wave = %3.3f Ghz',f0/10^9);
//------------------------------------------------------------------------------
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