A dielectric resonator filter having at least two poles for filtering a frequency band from an input frequency spectrum, which filter comprises (i) a body (2a, 2b) formed of electrically conductive material, which body (2a, 2b) defines a cavity (13) therein; (ii) a dielectric resonator element (1) enclosed...http://www.google.ca/patents/US20080129422?utm_source=gb-gplus-sharePatent US20080129422 - Tunable or Re-Configurable Dielectric Resonator Filter
