Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1988-11-16
1990-11-27
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313B, 333153, 333195, H01L 4108
Patent
active
049738755
ABSTRACT:
A surface elastic wave filter for processing a supplied signal into a signal with nonlinear-phase frequency characteristics has a piezoelectric substrate for propagating a surface elastic wave through a surface layer thereof and spaced input and output electrodes disposed on the surface layer for sending and receiving the surface elastic wave. Each of the input and output electrodes has a pair of common electrodes having comb-shaped interdigitating electrode fingers extending therebetween. The central electrode fingers of the input and output electrodes have central axes across the direction of propagation of the surface elastic wave. The distance along the direction of propagation between the central axes is varied in the direction substantially normal to the direction of propagation. The surface elastic wave filter may include an electric conductor disposed on the piezoelectric substrate between the input and output electrodes and having a dimension in the direction of propagation, the dimension being varied in the direction substantially normal to the direction of propagation. A medium for varying the speed of propagation of the surface elastic wave may be positioned in place of the electric conductor.
REFERENCES:
patent: 3818379 (1974-06-01), Wauk, II
patent: 3845420 (1974-10-01), Holland et al.
patent: 3883831 (1975-05-01), Williamson et al.
patent: 4203082 (1980-05-01), Tsukamoto et al.
patent: 4600905 (1986-07-01), Fredricksen
Budd Mark O.
Nihon Musen Kabushiki Kaisha
LandOfFree
Surface elastic wave device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Surface elastic wave device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface elastic wave device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1033832