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Vector network analysis question
You haven't fully described your setup, so it's hard to tell. What are
you using for a bridge? If I recall correctly, your VNA is an HP8754A, which won't do S-parameter measurements by itself; it requires an external bridge (an S-parameter test set, or a reflection-transmission test set, for example). The fact that you see an arc on the outermost circle, assuming that you have it set as a unit circle on the linear reflection coefficient plane (the Smith Chart outer circle), implies that you have a (nearly) unity reflection coefficient. Is something almost disconnected so it looks like a tiny series capacitance? |
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