Modeling of coupling by probes in dual mode cavities

An accurate model of coaxial probes used as input and output ports in dual-mode cavities (either air-filled or dielectric-loaded) is presented. The model precisely predicts such empirically observed phenomena as limited out-of-band isolation, generation of extra transmission zeros, and asymmetric responses. The model parameters can be determined from simple measured data. Experimental verification of the model is carried out and the measurements also provide useful data for the design and prediction of canonical data mode filters responses.<>