A Technique for Determination of Loss, Reflection, and Repeatability in Waveguide Flanged Couplings

A method of relating the properties of flanged waveguide couplings to the Q-factor, attenuation and resonant frequency of a waveguide cavity, of which they form a part, is discussed. The theory of the technique is developed and results of measurements, at 7.3 GHz, on cavities fabricated from sections of WG15 (WR112) are presented. Comparing these results with theory, the technique appears capable of detecting flange losses of less than 0.0005 dB and phase changes across the flange of less than 0.05 degrees.