Spoiler summary: The quarter-wave stub resonant frequency, when built in FR4, is about: f[GHz] = 1.5/Len[inches] or f[GHz] = 3.8/Len[cm]. Remember: before you start using rules of thumb, be sure to ...
In every measurement of the single ended insertion loss of a microstrip differential pair, there is a sharp dip. This is a natural feature of all microstrips. It is not a resonance, but related to far ...
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