An automatic standing-wave indicator for the 3-cm waveband

The equipment is based on the rotary type of standing-wave indicator, the mechanical rotation of the detector being replaced by a ferrite polarization-rotating section and a fixed detector. The v.s.w.r. information is extracted from the output signal and fed to a meter calibrated directly in v.s.w.r. and/or reflection coefficient. Advantages over other similar equipment are that there are no rapidly moving parts liable to wear, it does not rely on similarity of crystal characteristics, and the response at any one frequency is effectively instantaneous. The indicator can be used as a second grade microwave bench, for testing microwave systems and as production testing equipment for microwave components.