Title: Filter and antenna duplexer
Application Number: 200610126551 Application Date: 2006.08.25
Publication Number: 1921304 Publication Date: 2007.02.28
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03H9/64;H03H9/54
Applicant(s) Name: Fujitsu Ltd. Address:
Inventor(s) Name: Inoue Shogo;Nishihara Tokihiro;Matsuda Takashi;Ued
Attorney & Agent: huang lunwei
Abstract:
    The invention provides a filter and an antenna branching filter which can be made compact or improved in degree of freedom of design. The filter is equipped with a first resonator, a second resonator (S31) which is made less in excitation efficiency than the first resonator, and an inductor (L31) connected to the second resonator (S31) in parallel, and the antenna branching filter and a branching filter. Inductance added to the resonators to improve attenuation characteristics can be made small and the mount area is reducible. Alternatively, two antiresonance points can optionally be set.
Time: 8
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