Dielectric resonator, dielectric filter, dielectric duplexer, and communication device

摘要

A small-sized low-loss dielectric resonator, dielectric filter, and dielectric duplexer, and a communication device using such an element are disclosed. Through-holes (2) are formed in a dielectric block (1). The inner surface of each through-hole (2) is covered with a thin-film multilayer electrode (3) consisting of an outermost conductive layer (33) and a multilayer region including thin-film conductive layers (31) and thin-film dielectric layers (32). An outer conductor (4) having a similar thin-film multilayer electrode structure (43, 41, 42) is formed on the outer surface of the dielectric block (1). An outer conductor (4') in the form of a single-layer electrode is formed on a short-circuited end face of the dielectric block (1) thereby connecting together the thin-film conductive layers (31, 33, 41, 43) of the inner (3) and outer (4) conductors.