Dielectric filter, dielectric duplexer, and communication device

摘要

In a dielectric block (1), an array of three excitation holes (2a-2c), in each of which one opening is a short-circuited end and the other opening is an open-circuited end, are disposed so as to be interdigitally coupled and balanced input-output terminals (4a-4c) are provided at the opening of the excitation holes (2a,2c) at both ends of the array. A resonator hole (3b) is provided so as to be coupled to one excitation hole of the excitation (2a) holes at either end of the array. Thus, a compact dielectric filter with balanced input-output terminals is constructed. <IMAGE> <IMAGE> <IMAGE> <IMAGE>