MULTIMODE RESONATOR DEVICE, FILTER, COMPOSITE FILTER DEVICE, DUPLEXER AND COMMUNICATION EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To make a resonator smaller even though the number of steps of the resonator is increased while adopting the structure of a semi-coaxial cavity resonator by respectively constructing resonators that resonate in a semi-TE mode with a plurality of pairs of conductor projections formed on the inner faces of a cavity as central conductors. SOLUTION: The respective open faces of an almost rectangular parallelepiped-shaped cavity main body 1 with the two faces opened are covered with cavity lids 2 and 3. The body 1 is molded and formed with aluminum or copper, and the lids 2 and 3 are made of a metal plate. Conductor projections 4a to 4d are provided at the center part of each of the inner faces of the body 1, screw holes are formed on the end faces of the open faces of the body 1, and the lids 2 and 3 are screwed down to form a cavity space surrounded by the body 1 and the lids 2 and 3. Both a coaxial cavity resonator formed by the projections 4a and 4b and a cavity inner space and a coaxial cavity resonator formed by the projections 4c and 4d and the cavity inner space resonate in a semi-TE mode.