| 摘要 |
PROBLEM TO BE SOLVED: To provide a filtering apparatus which can be downsized while strengthening coupling between strip lines to reduce an insertion loss. SOLUTION: A band-pass filter configured by electromagnetically coupling at least two strip lines is characterized in disposing a parasitic element via an insulating layer in the vicinity of an electromagnetic coupling section between the strip lines. Namely, the present band-pass filtering apparatus comprises: a multilayered substrate (40) composed of a plurality of laminated dielectric substrates; strip lines (10, 11, 12, 13, 14) disposed between first layers of the multilayered substrate and electromagnetically coupled; parasitic elements (21, 22, 23, 24) disposed in the vicinity of the electromagnetic coupling section between the strip lines; and ground plates (31, 32) disposed on an upper surface and/or a lower surface of the multilayered substrate. COPYRIGHT: (C)2008,JPO&INPIT
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