Dielectric resonator, filter, duplexer, and communication device

Abstract

A dielectric resonator includes a cavity member formed of an electrically conductive material and a dielectric core disposed in the cavity member. The resistance against heat cycle fatigue in bonding portions between the dielectric core and the cavity member is enhanced without causing increases in material cost and production cost. An electrode is formed on each end face of the dielectric case, or on the end face of each flange portion of the dielectric core. A metal foil having a cover portion for covering each end face, and having a spring portion which may be bent along the outer edge of the flange portion is connected to the dielectric core by bonding the cover portion of the metal foil to the end face using an electrically conductive adhesive. Thereafter, the spring portion of the metal foil is soldered to the inner surface of the cavity wall. The metal foil has a portion raised toward the inner surface of the cavity wall, and the inside of the raised portion is filled with an adhesive. A filter, a duplexer, and an communication device are also formed using the above-described dielectric resonator.

Dependencies are inferred from the claim text.