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+// Chapter 3 example 14
+//------------------------------------------------------------------------------
+clc;
+clear;
+// Given data
+a   = 30;            // width of waveguide
+b   = 20;           // narrow dimension of waveguide
+c   = 3*10^8;       // velocity of EM wave in m/s
+m   = 1;            // for TE10
+n   = 0;            // for TE10
+
+// Calculations
+// lamda0   = 2/sqrt((m/a)^2 + (n/b)^2)
+lamda0      = (2*a)/m;      // longest cut-off wavelength in dominant mode TE10
+
+// Output
+mprintf('longest cut-off wavelength = %d mm',lamda0 );
+//-------------------------------------------------------------------------------