Znf = 35.4+i*48.7;

Z0 = 50;

Gamnfin = (Z0-Znf)/(Z0+Znf);

S11 = 0.15 + i*0.56;
S21 = 2 + i*4.1;
S12 = 0.09 + i*0.04;
S22 = -0.12 + i*0.37;

Gamnfout = (S22 + (S21*Gamnfin*S12)/(1-S11-Gamnfin));

Zout = -50*((Gamnfout-1)/(Gamnfout+1));