Radiofrequency transmitter and/or receiver

Details Radiofrequency transmitter and/or receiver Radiofrequency transmitter and/or receiver

2007-09-25

2007-09-25

Al-Aubaidi, Rasha S. (Department: 2614)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S189100, C455S261000, C455S266000

Reexamination Certificate

active

09874341

ABSTRACT:
The invention provides a simple solution for a broadband transmitter/receiver for which the working bandwidth is split into at least two non-contiguous sub-bands. The invention uses a filtering means50which comprises at least two band-pass filters51and52provided with switching means53and54.The use of two switched filters51and52makes it possible to use a single synthesizer6to scan two sub-bands of the working bandwidth. The frequency synthesizer6operates for one sub-band in supradyne mode and for the other sub-band in infradyne mode. In a variant, the invention uses a third filter and divides the bandwidth into three sub-bands.

REFERENCES:
patent: 3414821 (1968-12-01), Bickers et al.
patent: 5483209 (1996-01-01), Takayama
patent: 5731699 (1998-03-01), O'Byrne
patent: 5790959 (1998-08-01), Scherer
patent: 19731480 (1998-05-01), None
patent: 401932 (1990-12-01), None
patent: 771069 (1997-05-01), None
patent: 4208723 (1992-07-01), None
patent: 95/19074 (1995-07-01), None
Patent Abstracts of Japan, vol. 016, No. 550, Nov. 19, 1992 & JP 4208723.
French Search Report citing the above-listed documents: AA, AB, AC, AD, AE, AF, AG, AH, and AI.

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