Title: Duplexer and ladder type filter
Application Number: 200610115410 Application Date: 2006.08.08
Publication Number: 1913348 Publication Date: 2007.02.14
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03H9/54
Applicant(s) Name: Fujitsu Media Devices Ltd. Address:
Inventor(s) Name: Nishihara Tokihiro;Inoue Shogo;Matsuda Takashi;Ued
Attorney & Agent: huang lunwei
Abstract:
    The invention provides a duplexer and ladder type filter capable of reducing a loss, increasing an attenuation amount and being small-sized. A duplexer includes an antenna terminal, a first filter connected to the antenna terminal, and a second filter connected to the antenna terminal. At least one of the first filter and the second filter is a ladder type filter in which a parallel resonator and multiple series resonators are included, one or more first inductors are respectively connected in parallel with one or more series resonators out of the multiple series resonators, and one of the one or more first inductors is connected in parallel with one of the multiple series resonators that is arranged closest to the antenna terminal.
Time: 9
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