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+//example:11.10,page no.-637.
+// program to design a transistor oscillator at 4 GHZ using a GaAs FET in common gate configuration.
+s11=2.18*expm(%i*(-35)*%pi/180);
+s21=2.75*expm(%i*(96)*%pi/180);
+s12=1.26*expm(%i*(18)*%pi/180);
+s22=0.52*expm(%i*(155)*%pi/180);// all are s parameter that are applicable for transistor in common gate configuration with aseries inductor.
+delta=s12*s21-s11*s22;
+Ct=conj(s22-delta*conj(s11));
+Rt=abs((s12*s21)/(abs(s22)^2-abs(delta)^2))
+taot=0.59*expm(%i*(-104)*%pi/180);
+taoin=s11+(s12*s21*taot)/(1-s22*taot);
+[mag_taoin,theta_taoin]=polar(taoin)
+Zin=((1+taoin)/(1-taoin))*Zo;
+Zl=-(real(Zin)/3)-(%i*imag(Zin));
+disp([mag_taoin,theta_taoin])
+disp(Zl,'the load impedence will be = ')
+\ No newline at end of file