Two part cavity Q measurement using scattering parameters

Abstract

A method of measuring Q of a two port cavity by scattering parameters is described. The scattering parameters of a two port cavity resonator are derived by a lumped equivalent circuit model as a function of cavity parameters, including the cavity Q. These can be also obtained by direct measurement with a modern network analyzer. The results agree well with those from other well-known methods. This two port measurement can provide additional information such as the coupled power ratio, which is one of the important parameters for the beam-accelerating cavities. (C) 1996 American Institute of Physics.