Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2005-07-12
2005-07-12
Vuong, Quochien B. (Department: 2685)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S067130, C455S311000, C455S323000
Reexamination Certificate
active
06917803
ABSTRACT:
Wireless communications equipment that wirelessly communicates signals on a plurality of communication frequencies includes: a baseband frequency-side frequency conversion means that performs conversion between baseband signals on the baseband frequency and signals on a stipulated frequency higher than the baseband frequency and different from the intermediate frequency, an intermediate frequency-side frequency conversion means that performs conversion between the signals on said stipulated frequency and intermediate frequency signals on a plurality of intermediate frequencies corresponding to a plurality of communication frequencies, and an unwanted frequency signal component removal means that removes signal components of unwanted frequencies from the signals on said stipulated frequency. Thus, it is possible to share the components used for the removal of unwanted frequency signal components for the intermediate frequency signals of a plurality of intermediate frequencies, and thus the cost and unit size can be reduced.
REFERENCES:
patent: 5507017 (1996-04-01), Whitmarsh et al.
patent: 5724380 (1998-03-01), Ritter
patent: 6032032 (2000-02-01), Kato et al.
patent: 6728321 (2004-04-01), Neubauer et al.
Hitachi Kokusai Electric Inc.
Vuong Quochien B.
Wenderoth , Lind & Ponack, L.L.P.
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