Filter and antenna duplexer

Wave transmission lines and networks – Plural channel systems – Having branched circuits

Reexamination Certificate

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Reexamination Certificate

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07741930

ABSTRACT:
There is provided a filter including a first resonator, a second resonator in which an excitation efficiency is reduced more than the first resonator, and an inductor connected in parallel with the second resonator.

REFERENCES:
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patent: 6469598 (2002-10-01), Tsuzuki et al.
patent: 6522219 (2003-02-01), Takamiya et al.
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patent: 2002/0153969 (2002-10-01), Inoue et al.
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patent: 2005/0035831 (2005-02-01), Kawachi et al.
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patent: WO-2005-060094 (2005-06-01), None
Japanese Office Action dated Dec. 1, 2009, 9 pages.

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