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+// chapter 4 example 11
+//-----------------------------------------------------------------------------
+clc;
+clear;
+// given data
+di       = 6;        // internal diameter in cms
+d        = 5;        // length in cm
+a        = 4;        // internal radius in cms
+fo      = 10*10^9;  // operating frequency in Ghz
+ha01    = 2.405;    // Eigen value of bessel function
+ha11    = 1.841;    // Eigen value of bessel function
+c       = 3*10^10   // velocity of EM wave in cm/sec
+// For TM011 mode and TE111 mode
+m0       = 0
+m1       = 1
+n1       = 1
+p1       = 1
+p2       = 2
+
+// Calcultions
+f0  = (c/(2*%pi))*sqrt((ha01/a)^2 + (p2*%pi/d)^2)           //resonant frequency for TM012 mode 
+f01  = (c/(2*%pi))*sqrt((ha11/a)^2 + (p1*%pi/d)^2)           //resonant frequency for TE111 mode 
+
+// Output
+mprintf('Resonant frequency for TM012 mode = %3.3f Ghz\n Resonant frequency for TM111 mode = %3.3f Ghz\n',f0/10^9,f01/10^9 );
+//------------------------------------------------------------------------------