Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Reexamination Certificate
2006-12-28
2010-12-14
Phu, Sanh D (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
C455S296000, C455S341000, C455S307000, C343S7000MS
Reexamination Certificate
active
07853232
ABSTRACT:
To provide an antenna device adapted to interrupt jamming waves and enable cost reduction, a high-pass filter (HPF) adapted to interrupt general-use frequencies at least near a low-frequency side of a pass band intended for use is provided as a frequency selection circuit11A on the antenna1side in an initial-stage LNA2A. By setting a low-side cutoff frequency to 900 MHz, it is possible to prevent reception of frequencies in a general-use frequency band with a high frequency of use as jamming waves. That is, for example, it is possible to prevent reception of frequencies in 800 to 900 MHz band for mobile cellular telephones and higher harmonics thereof as jamming waves. Further, since an additional filter is not required in the antenna device, the circuit structure can be simplified.
REFERENCES:
patent: 4282547 (1981-08-01), Morishita
patent: 7109925 (2006-09-01), Noro et al.
patent: 2002-237764 (2002-08-01), None
patent: 2004-015096 (2004-01-01), None
patent: 2004-032674 (2004-01-01), None
patent: 2004-260555 (2004-09-01), None
patent: 2005-109602 (2005-04-01), None
patent: WO 00/19621 (2000-04-01), None
Japanese Office Action dated Jul. 14, 2010 and English translation thereof in counterpart Japanese Application No. 2005-377680.
Holtz Holtz Goodman & Chick PC
Mitsumi Electric Co. Ltd.
Phu Sanh D
LandOfFree
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