Patent ID: 6094113
Filing Date: 2000-07-25
Classification: H01P

Abstract:
A dielectric resonator filter having an input port which receives an electromagnetic signal and an output port at which is provided a filtered electromagnetic signal, the filter operating in a magnetic dipole mode and comprising:a multi-cavity housing having a plurality of vertical walls disposed at least partially between a base of the dielectric resonator filter and a cover of the dielectric resonator filter, defining a plurality of sequential dielectric resonator cavities that are sequentially oriented in first and second side-by-side rows;a plurality of cylindrically shaped dielectric resonators, each cylindrically shaped dielectric resonator respectively disposed in a corresponding one of the plurality of sequential dielectric resonator cavities;at least one coupling device respectively disposed in a corresponding first wall of each of the plurality of sequential dielectric resonator cavities, the at least one coupling device providing coupling of the electromagnetic signal between the respective dielectric resonators of the corresponding sequential dielectric resonator cavities;a cross-coupling device disposed through a second wall of a first resonator cavity and a second resonator cavity of the plurality of sequential dielectric resonator cavities, wherein the first resonator cavity and the second resonator cavity are non-sequential, the cross-coupling device providing cross coupling of the electromagnetic signal between the respective dielectric resonators of the first and second resonator cavities;wherein the plurality of vertical walls of the dielectric resonator filter are provided with a plurality of protrusions disposed along a top surface of the plurality of vertical walls, and wherein the cover is provided with a plurality of through-holes aligned to mate with the protrusions along the plurality of vertical walls; andwherein the at least one coupling device is a respective iris having a width that provides a desired inter-resonator positive coupling factor between the respective resonators of the corresponding sequential dielectric resonator cavities, wherein the respective iris includes a corresponding high-order mode suppression bar, vertically disposed substantially in a middle of the respective iris, so as to provide a first iris and a second iris, and wherein the respective high-order mode suppression bar suppresses high-order electromagnetic field modes without substantially changing the corresponding inter-resonator positive coupling factor.