| 摘要 |
PROBLEM TO BE SOLVED: To weaken inductive coupling between a first resonator and a third resonator, and to readily adjust the inductive coupling between two optional resonators, in a laminated band-pass filter where a second resonator is inductively coupled with each of the first resonator and the third resonator. SOLUTION: The band-pass filter 1 includes the first-third resonators integrated with a laminate 20, an external surface conductor part 24 arranged on the bottom surface 20B of the laminate 20 and connected to the ground, and an external surface conductor portion 25, arranged on the upper surface 20A of the laminated body 20. The first resonator has a first inductor, the second resonator has a second inductor, and the third resonator has a third inductor. The second inductor has two internal conductor layers 341 and 441 for electrically connecting the external surface conductor portions 24 and 25. The conductor layer 341 is inductively coupled with the first inductor, and the conductor layer 441 is inductively coupled with the third inductor. COPYRIGHT: (C)2011,JPO&INPIT
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