| 摘要 |
PCT No. PCT/JP92/00060 Sec. 371 Date Sep. 25, 1992 Sec. 102(e) Date Sep. 25, 1992 PCT Filed Jan. 24, 1992 PCT Pub. No. WO92/14275 PCT Pub. Date Aug. 20, 1992.In a filter having a plurality of resonators (31, 32) electromagnetically coupled with each other, a multi-layer circuit board (33) is attached to one end in the longitudinal direction of the resonators (31, 32). Interstage circuit elements constituting a part of the filter components along with input and output terminals of the filter are formed in the multi-layer circuit board, and the elements of the multi-layer circuit board are connected with the resonators. The main surface of the multi-layer circuit board is located in a plane perpendicular to the longitudinal axis of the resonators so that the longitudinal length of the filter including the resonators and the multi-layer circuit board is made short. The multi-layer circuit board has trimming electrodes of the capacitors provided on the surface thereof and a coil pattern provided in the inside thereof.
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