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Determination parasite capacities of resistance?

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nassim1

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In hybrid microwave cicruit when resistance has been used so how can we determine its parasite capacities ? (attached figure....)
many thanks
N
 

radiohead

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C2 and C3 will be dominated by the pads of your test fixture - normally these can be deembedded if calibrated in TRL. If not you can estimate them from the C=epsilon*surface/thickness formula. Then what remains is C1, this can be extracted from the zero in your S21 measurement. This simple model will be adequate for most applications.
 

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