From: Barry Ma (email@example.com)
Date: Fri Jun 09 2000 - 16:33:23 PDT
Thanks for your instructive input.
Our simple task is to know what is the upper limit of operating frequency for the planecap. In S11 measurement, when the measuring point in the Smith chart moves from outside circle (nearly "short circuit") toward the center, indicating the impedance of planecap gets higher than 1 ohm, we can know that is the upper limit.
The price for the simple S11 measurement is inaccuracy. But it still gives us a rough approximation.
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