Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2005-01-11
2005-01-11
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S196000, C310S31300R
Reexamination Certificate
active
06842091
ABSTRACT:
A reflective grating (36) for a SAW filter (10) or resonator. The reflective grating (36) is formed by selectively dithering grating grid lines (38) with respect to a uniform spaced grid of M number of grid lines (38) per each N wavelength (λ) of the grating (36) (Nλ/M), where λ is the wavelength of the center of the frequency band of interest, M and N are integers and M>N. M and N are selected so that the grating (36) does not have a net reflection when all of the grid lines (38) are uniformly spaced. By controlling the dithering pattern of the grid line in each sampling period of Nλ, any desired net distributed reflectivity from the grating can be implemented in both magnitude and phase.
REFERENCES:
patent: 4281301 (1981-07-01), Stevens et al.
patent: 4484160 (1984-11-01), Riha
patent: 5289073 (1994-02-01), Mariani
patent: 5365206 (1994-11-01), Machui et al.
patent: 5475348 (1995-12-01), Hode et al.
patent: 5661444 (1997-08-01), Dill et al.
patent: 5896072 (1999-04-01), Bergmann et al.
patent: 6104260 (2000-08-01), Yamada et al.
patent: 42 13 117 (1993-10-01), None
patent: 0 614 272 (1994-09-01), None
patent: 1 003 286 (2000-05-01), None
Dill, R. et al., A Novel SAW Filter for IF-Filtering in DECT Systems:, Ultrasonics Symposium, 1995 IEEE Proceedings., 1995 IEEE, Seattle, WA, USA, Nov. 7-10, 1995, New York, NY, USA, IEEE, US, Nov. 7, 1995, pp. 51-54.
Woods, R.C., “Dispersive Delay Lines Using 180 degrees Reflecting Metal Dot Arrays”, Ultrasonics Symposium Proceedings, San Diego, CA, USA, vol. 1, Oct. 29, 1982, pp. 88-91, New York, NY.
Riha, G., et al., “RAC-Filters with Position Weighted Metallic Strip Arrays”, Proceedings of the Ultrasonics Symposium, San Diego, CA, USA, Oct. 27-19, 1982, vol. 1, Oct. 29, 1982, pp. 83-87.
Miller John A.
Northrop Grumman Corporation
Summons Barbara
Warn, Hoffmann, Miller & LaLone, P.C.
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