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+//Chapter-6, Example 6.9, Page 241

+//=============================================================================

+clc;

+//Input parameters

+ins=0.5;//insertion loss in db

+iso=20;//isolation loss in db

+S=2;//VSWR 

+//Calculations

+S21=10^-(ins/20);//insertion loss=0.5=-20*log[S21]

+S13=S21;

+S32=S13;

+S12=10^-(iso/20);//isolation loss=30=-20*log[s12]

+S23=S12;

+S31=S23;

+p=(S-1)/(S+1);

+S11=p;

+S22=p;

+S33=p;

+[S]=[S11,S12,S13;S21,S22,S23;S31,S32,S33];

+disp(S);

+//for a perfectly matched,non-reciprocal,lossless 3-port circulator,[S] is given by

+//[S]=[0,0,S13;S21,0,0;,0,S32,0]

+//i.e.,S13=S21=S32=1

+//[S]=[0,0,1;1,0,0;0,1,0]

+//=================================END OF PROGRAM==============================