MIXED-MODES DIELECTRIC RESONATOR FILTERS

A new configuration of dielectric loaded cavity filters is presented. The filter combines the superior spurious free performance of TE(01) m ode ring dielectric resonators with the advantage of HE(11) dual-mode dielectric loading. Resonant frequency, field distributions and unload ed Q of each cavity are computed by rigorous mode-matching technique. The fields are used to compute the coupling between two similar caviti es by small aperture approximation based on formulae modified by Levy, which are extended to the cases of dissimilar cavities. Design aspect s of the filter are discussed. This filter is used to construct an L-b and triplexer, Excellent experimental results verify the theory and sh ow the advantage of this type of filter.