Highly selective filtering device and corresponding...

Details Highly selective filtering device and corresponding... Highly selective filtering device and corresponding...

2003-12-17

2008-10-14

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S552000

Reexamination Certificate

active

07436250

ABSTRACT:
The invention proposes a filtering device having a frequency response which is symmetrical, using asymmetrical filters coupled by transposition means. The advantageous characteristics of the asymmetrical filters are retained and the faults associated with the asymmetry are eliminated. The asymmetrical filters are, for example, quartz filters. The invention also proposes an external transmission and reception unit, using the filtering device with the application of the filtering method.

REFERENCES:
patent: 4174489 (1979-11-01), Guidoux et al.
patent: 4310803 (1982-01-01), Kurihara et al.
patent: 4860321 (1989-08-01), von der Embse
patent: 5097221 (1992-03-01), Miller
patent: 5844939 (1998-12-01), Scherer et al.
patent: 2002/0044021 (2002-04-01), Van Der Woude et al.
patent: 2282286 (1995-03-01), None
Copy of Search Report dated May 7, 2004.

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