[IDF01]Interdigital Bandpass Filter (~2.4 GHz)
Four-pole interdigital bandpass filter. Individual pole frequencies match within 1% across the band.
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Measured on a real VNA.
Compared against the RayRF prediction.
We measured 9 real structures on a calibrated LiteVNA64 and compared them to the RayRF simulation results. RayRF shows excellent frequency accuracy with a converged mesh, and generally predicts a less lossy depth than reality, which is consistent with solver idealization of real-world material properties.
Per-DUT comparison
How the measurements were taken.
Measurements were taken using a LiteVNA64 warmed up for 24 hours to limit thermal drift during measurement. Short Open Load Through (SOLT) calibration was performed against high quality references, and redone five times at even intervals through the 10-hour session to characterize drift. Each device-under-test (DUT) was measured from 1 MHz to 8 GHz at 12,276 points with 5-trace averaging. The calibrations were applied by taking the median of all SOLT recordings.
S11 on 2-port systems was always measured with a precision 50 ohm load on the second port, which limits cable mismatch on the S21 side from corrupting S11. S21 is the VNA's direct through-measurement with no de-embedding, so the curve published here is what the same board gives you on your own bench.
Note: the LiteVNA64 is officially specified to 6.3 GHz, and although we believe our methodology of heavy averaging, multiple calibrations, and median processing greatly improves the reliability of the high-frequency results, treat anything above 6.3 GHz as reference only.