Via Stub & Backdrill Screener
Screen residual via stub resonance and quarter-wave length before backdrill review.
Live results
| Measurement | Result |
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Formula and worked example
Method. First quarter-wave resonance = velocity / (4 × stub length). Quarter-wave length at a given frequency = velocity / (4 × frequency).
Assumptions. This treats the stub as a uniform open transmission line. Via loading, return geometry and material loss can shift the resonance. Use fabricator backdrill tolerances.
Example. A 2 mm residual stub at 160 mm/ns has a first quarter-wave estimate of 20 GHz.