Dielectric filter having coupling windows between resonators, and transceiver using the dielectric filter

摘要

A dielectric filter in which both the resonant frequency of each resonator and the degree of coupling between resonators can be adjusted independently. The dielectric filter includes first and second dielectric blocks, each having a through bore which defines a dielectric resonator whose electric energy component varies along the through bore. An isolated first coupling electrode is formed on a first side surface of the first dielectric block for coupling an input signal to the first dielectric resonator. An isolated second coupling electrode is formed on a second side surface of the first dielectric block where the electric energy component is relatively high so that electric energy in the first dielectric block exits the first dielectric block via the second coupling electrode. A third coupling electrode is formed on the first side surface of the second dielectric block corresponding to the second coupling electrode such that electric energy leaving the first dielectric block enters the second dielectric block via the third coupling electrode and sets up an electromagnetic field in the second dielectric block whose electric energy component varies along the through bore. A fourth coupling electrode is formed on a second side surface of the second dielectric block where the resonant electric energy component in the second dielectric block is relatively high such that electric energy leaves the second dielectric block via the fourth coupling electrode.