OK. It appears that you are simulating a lumped-element 180-degree power splitter to feed a dipole antenna. You might want to do a time domain (transient) simulation to be sure you are seeing what you expect. I don’t know if uSimmics will accept .S1P file in a time domain simulation. If not, substitute resistors that are close to the real part. Look at the Port 2 and Port 3 waveforms on the same graph at a few frequencies. I think you want outputs of equal amplitude and 180 degrees out of phase.
