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+// chapter 4 example 9
+//-----------------------------------------------------------------------------
+// Note : some data from is problem is taken from Ex4.8 
+clc;
+clear;
+// given data
+a       = 4;        // width in cm
+b       = 2;        // Height in cm
+c       = 3*10^10;   // vel in free space in cm/s
+fo      = 6*10^9;    // resonator frequency in Ghz
+d       = 3.2;       // length of cavity resonator in cm
+// For TE101 mode
+m       = 1
+n       = 0;
+
+// Calculations
+lamda_c = 2/sqrt((m/a)^2 + (n/b)^2);        // cut-off wavelength in m
+lamda   = c/fo;                             // operating wavelength in m
+lamda_g = lamda/sqrt(1 - (lamda/lamda_c)^2) // guide wavelength in m
+
+mprintf('Length of resonator is %3.1f cm and  guide wavelength is %3.1f cm',d,lamda_g);
+mprintf('\n length of resonator is half of guide wavelength');
+//------------------------------------------------------------------------------