Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Tokihiro Nishihara0
Go Endo0
Masafumi Iwaki0
Masanori Ueda0
Date of Patent
July 13, 2010
0Patent Application Number
118125140
Date Filed
June 19, 2007
0Patent Primary Examiner
Patent abstract
A duplexer includes an antenna terminal, a first filter connected to the antenna terminal, a second filter that has a passband at a high-frequency side of the first filter and is connected to the antenna terminal, and a resonance circuit that is connected between the second filter and the antenna terminal and includes a first inductor and a first capacitor connected in parallel. Assuming that a passband frequency of the first filter ranges from f1Low to f1High (f1Low˜f1High) and a passband frequency ranges from f2Low to f2High (f2Low˜f2High), the resonator has a resonance frequency fr satisfying:fr=(f2Low˜f2High)±(f1Low˜f1High),orfr=2(f1Low˜f1High)±(f2Low˜f2High).
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