Conformal mapping of S-parameters of a three-terminal network from its feedback impedance admittance

Feedback in high-frequency networks always takes the form of simple series and/or shunt applied to a single stage. Application of feedback changes the scattering parameters of the network considerably. A mapping relationship for the S-parameters directly from the feedback impedance and admittance is presented. This is a conformal Mobius transformation and, on a Smith chart, maps disks of impedance or admittance to disks of the new S-parameters.<
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