Surface acoustic wave device

Details Surface acoustic wave device Surface acoustic wave device

2007-04-24

2007-04-24

Budd, Mark (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

11268274

ABSTRACT:
A surface acoustic wave device has a high electromechanical coefficient and reflection coefficient, and also has an improved frequency-temperature characteristic that is achieved by forming a SiO2film on an IDT so as to prevent cracking from occurring on a surface of the SiO2film so that desired properties can be reliably obtained. The surface acoustic wave device includes at least one IDT, which is composed of a metal or an alloy having a density higher than that of Al and is formed on a 25° to 55° rotation-Y plate X propagation LiTaO3substrate, and a SiO2film disposed on the LiTaO3substrate so as to cover the at least one IDT for improving the frequency-temperature characteristic.

REFERENCES:
patent: 3965444 (1976-06-01), Willingham et al.
patent: 4978879 (1990-12-01), Satoh et al.
patent: 5818146 (1998-10-01), Kurahashi et al.
patent: 5838089 (1998-11-01), Dreifus et al.
patent: 6429569 (2002-08-01), Kadota
patent: 6580198 (2003-06-01), Nakano et al.
patent: 6677696 (2004-01-01), Ruile
patent: 61-136312 (1986-06-01), None
patent: 02-295212 (1990-12-01), None
patent: 06-164306 (1994-06-01), None
patent: 11-186866 (1999-07-01), None
Campbell et al., “A Method for Estimating Optimal Crystal Cuts and Propagation Directions for Excitation of Piezoelectric Surface Waves”; IEEE Transactions on Sonics and Ultrasonics, vol. SU-15, No. 4, Oct. 1968, pp. 209-217.
Kawachi et al., “Optimum Cut of LiTaO3 for High Performance Leaky Surface Acoustic Wave Filters”; 1996 IEEE Ultrasonics Symposium, pp. 71-76.
Kadota et al.; Currently pending U.S. Appl. No. 10/270,207, filed Oct. 12, 2002; Mikio Kadota et al.; “Surface Acoustic Wave Device”.

Affiliated with

Also associated with

Rating

Surface acoustic 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 acoustic wave device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface acoustic wave device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3755008