Composite dielectric-loaded resonators for highly-stable bandstop and bandpass filters

Use of composite-dielectric resonators, in both direct coupled and capacitively-coupled implementations, enables realization of both bandstop and bandpass filters, with similar construction, high power capability and unique, temperaturestable properties. Improving temperature stability allows for reduction in filter order by elimination of tunikng guardband, while lumped element substation for transmission line lengths provides suppression of periodic distributed element responses and thus wide stopbands for bandpass filters.