A gradient is only as useful as the simulation it differentiates. These two
boards are solved by rfx and by openEMS, and each comparison is a test in the
repository (tests/crossval/rt5880_patch/ and tests/crossval/msl_notch_filter/).
Pending for 2.0 (tracker 1471). The curves on this page were computed with rfx 1.8.0 (commit
b46a8220), before the settling check judged each frequency bin a result reads. Both cases are
being re-measured under the current check, so this page quotes no agreement figure until that run is in
the repository. The notch filter’s uniform-mesh ladder is not yet shown to converge on the drawn
600 µm line.
Probe-fed patch on RT/Duroid 5880
The figure shows the real and imaginary parts of the input impedance from both
solvers. Neither model declares a probe radius, so each feed cell sets the
probe’s series reactance; the two solvers’ reactance curves differ for that
reason, and the case judges the resonance and the input resistance, not the
|S11| dip.
Microstrip open-stub notch filter
A 12 mm open stub on a 50 Ω microstrip line (254 µm, εr 3.66) is a quarter wave near 3.7 GHz, where it shorts the line. The figure shows |S21| and |S11| from both solvers.
Each comparison holds for its board, mesh, band and observable.