Dielectric filter, dielectric duplexer, and communications equipment

摘要

A dielectric block has opposing open and closed end faces extending between opposing top and bottom surfaces thereof. An outer conductor is formed on an outer surface of the dielectric block including the top and bottom surfaces and the closed end face thereof. A plurality of plated through holes extend from the front to the rear face of the dielectric block, the plated through holes having respective internal conductors formed thereon. The internal conductors are conductively coupled to the outer conductor at the closed end face of the dielectric block. An excitation hole extends from the open to the closed end face of the dielectric block and has an inside electrode formed thereon. The inside electrode is conductively coupled to the outer conductor at the open end face thereof. An input-output electrode extends over the open end face of the dielectric block and the mounting surface and is conductively coupled to the inside electrode. Various structures are built into the dielectric block to the ground current flowing through the outer conductor located on the open end surface of the dielectric block from the inside electrode of the excitation hole to the top and mounting surfaces of the dielectric block.