| 摘要 |
PROBLEM TO BE SOLVED: To provide a dielectric filter, a dielectric duplexer, and communication equipment provided with the same, with which prescribed external coupling can be obtained independently of the resonance frequency of resonators configured in a dielectric block while ensuring great external coupling. SOLUTION: The dielectric filter whose outer shape forms almost a hexahedron employs a dielectric block 1 having holes 2a, 2b, 2c penetrated through two opposed faces among six faces of the hexahedron, inner conductors are formed on inner surfaces of the holes 2a, 2b, 2c, and an outer conductor 4 and input output electrodes 5a, 5c are formed on the outer surface of the dielectric block 1. An inner conductor non-forming part g is provided from one open end of the holes 2a, 2c to the inside of the hole by a prescribed depth, the input/output electrodes 5a, 5c are formed from the mount face of the dielectric block 1 to the open surfaces of the holes 2a, 2b, 2c, and the input/output electrodes 5a, 5c are placed so that part of the end edges faces the opening ends of the holes 2a, 2c over a prescribed circumferential length. COPYRIGHT: (C)2004,JPO
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