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+// Chapter 3 example 11
+//------------------------------------------------------------------------------
+clc;
+clear;
+// Given data
+a   = 1.5*10^-2;        // width of waveguide 
+b   = 1*10^-2           // narrow dimension of waveguide
+er  = 4;                // dielectric constant
+f   = 8*10^9;           // frequency in Hz
+c   = 3*10^8            // velocity in m/s
+
+// calculations
+lamda_c     = 2*a;      // cut-off wavelength for TE10 mode
+lamda       = c/f       // wavelength corresponding to given freq.
+lamda_d     = lamda/sqrt(er);   // wavelength when waveguide filled with dielectric
+if lamda_d < lamda_c then
+    mprintf('8 Ghz frequency will pass through the guide');
+end