Dielektrische Filter mit Koppelelektroden um Resonatoren oder Elektroden zu Verbinden, und Verfahren zur Einstellung der Frequenzcharakteristik des Filters

摘要

A tri-plate type dielectric filter having a dielectric substrate (24, 30, 32), a plurality of resonator electrodes (18) embedded in the substrate, and coupling electrodes (22, 26) formed within the dielectric substrate, for electrically connecting the resonator electrodes, so as to provide capacitors (36, 38) each between adjacent ones of the resonator electrodes. The resonator electrodes may take the form of parallel elongate strips each providing a stripline type lambda /4 or lambda /2 TEM mode resonance circuit. One end of each strip is exposed on an outer surface of the substrate (30, 32). This end of each strip is trimmed to adjust the resonance frequency of the resonance circuit.