So, I’ve designed and simulated 5-pole Chebyshev BP filters in LTSpice VII and also in QSpice 2 weeks ago. In LTSpice, I used the .net directive to obtain S11 for the filter’s Return Loss. I spoke with Mike Englehardt about QSpice not supporting the .net directive yet. He recommended I read an ar…

How to extract S-parameters (S11, S21, S21, and S22) from passive network?

KSKelvin March 21, 2026, 1:54am 11

.net directive is now support in Qspice.