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Directivity And VSWR Measurements: Understanding Return Loss Measurements By Doug Jorgesen and Christopher Marki, Marki Microwave, Inc.
The characterization of microwave networks requires discriminating between forward and backward traveling waves. Unfortunately no directional device is perfect, leading to potentially dramatic measurement errors. In this note we show that return loss and VSWR measurements are greatly complicated by the finite performance of the directional device used to measure the reflected power.