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// Chapter 3 example 19
//------------------------------------------------------------------------------
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
f = 5*10^9 // operating frequency in Hz
m0 = 0; // for TE01
m1 = 1; // for TE10 / TE11 /TM11
n0 = 0; // for TE10
n1 = 1; // for TE11 or TM11
// Calculations
lamda = c/f; // operating wavelength
lamda_TE01 = 2/sqrt((m0/a)^2 + (n1/b)^2) // cutoff wavelength for TE01
lamda_TE10 = 2/sqrt((m1/a)^2 + (n0/b)^2) // cutoff wavelength for TE10
lamda_TE11 = 2/sqrt((m1/a)^2 + (n1/b)^2) // cutoff wavelength for TE11 or TM11
if lamda_TE01 >lamda then
mprintf('TE01 propagates in the given guide at the given operating frequency');
elseif lamda_TE10 >lamda then
mprintf('TE10 propagates in the given guide at the given operating frequency');
elseif lamda_TE11 >lamda then
mprintf('TE11 propagates in the given guide at the given operating frequency');
end
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