Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2005-01-25
2005-01-25
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C310S31300R
Reexamination Certificate
active
06847272
ABSTRACT:
A reflective grating (18) having spaced grid lines (36) patterned on a piezoelectric substrate (12) for controlling the magnitude and phase of surface acoustic waves (28) in a reflective filter (10) or resonator. The magnitude and phase of the surface acoustic wave (28) are controlled by a sampling period (34) of the reflective grating (18) and the density and sequence of distributed acoustic reflective dots (42). The reflective dots (42) are randomly distributed within gaps (40) between adjacent grid lines (36) or on top of the grid lines (36) of the reflective grating (18). The pattern of the reflective dots distributed within the gaps (40) or on the grid lines (36) is determined by the dot density, where the dot density varies from a lowest density of 0 to a maximum density of 1.
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Garber Edward M.
Kong Alvin M.
Yip Davis S.
Miller John A.
Northrop Grumman Corporation
Summons Barbara
Warn, Hoffmann, Miller & LaLone, P.C.
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