Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate
2005-03-01
2005-03-01
Trinh, Sonny (Department: 2687)
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
C455S249100, C455S296000, C455S063100, C455S067130, C455S114200
Reexamination Certificate
active
06862441
ABSTRACT:
A filter arrangement for use in a multiband dual-mode mobile phone. In particular, the mobile phone is operable in a W-CDMA mode and a band-reject filter comprising at least a series and a shunt acoustic-wave resonators is used to create a deep notch at the receive frequency band. The band-reject filter further includes a plurality of inductive elements for matching static capacitance of the resonators at the passband frequency. The mobile phone is also operable in 1800 and 1900 GSM bands. The band-reject filter is operatively connected to a harmonic trap in order to eliminate the third harmonic of these GSM bands. The mobile phone is also operable in the lower GSM band, for which a harmonic filter can share an antenna path with the band-reject filter.
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Nokia Corporation
Phan Huy
Trinh Sonny
Ware Fressola Van Der Sluys & Adolphson LLP
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