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+//Example 3.8.a // Excess loss
+clc;
+clear;
+close;
+//given data :
+P1=60;// in micro-W
+P3=26;// in micro-W
+P4=27.5;// in micro-W
+P2=0.004;// in micro-W
+E_loss=10*log10((P1/(P3+P4)));
+disp(E_loss,"(a). The excess loss,(dB) = ")
+I_loss=10*log10(P1/P4);
+disp(I_loss,"(b).i. insertion loss port 1 to port 4,(dB) = ")
+I_loss1=10*log10(P1/P3);
+disp(I_loss1,"(b).ii. insertion loss port 1 to port 3,(dB) = ")
+C_talk=10*log10(P2/P1);
+disp(C_talk,"Cross talk,(db) = ")
+sr=(P3/(P3+P4))*100;
+disp(sr,"Split ratio,(%) = ")