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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);
+//------------------------------------------------------------------------------