SAW filter operable in a piston mode

Details SAW filter operable in a piston mode SAW filter operable in a piston mode

2007-09-28

2009-08-18

Leung, Quyen (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

07576471

ABSTRACT:
A SAW transducer includes a pair of opposing bus bars formed on a surface of a piezoelectric substrate with a plurality of interdigital electrodes extending from each of the opposing bus bars. A center region and opposing edge regions are formed, wherein each edge region is proximate each bus bar and includes free end portions of the electrodes such that a wave velocity in each edge region is substantially lower than a wave velocity in the bus bars and in the center region, and wherein electro-acoustic sources extend into the edge regions for providing a SAW transducer having the piezoelectrically excited strongest mode is a piston mode with an amplitude distribution generally flat across most of the resonator area.

REFERENCES:
patent: 5831492 (1998-11-01), Solie
patent: 6121860 (2000-09-01), Tsutsumi et al.
patent: 6841918 (2005-01-01), Kando
patent: 6960866 (2005-11-01), Kando
patent: 7075390 (2006-07-01), Bungo et al.
patent: 7170376 (2007-01-01), Mills et al.
patent: 7187101 (2007-03-01), Kidoh
patent: 2007/0018755 (2007-01-01), Mayer et al.
Markus Mayer, Andreas Bergmann, Gunter Kovacs and Karl Wagner; “Low Loss Recursive Filters for Basestation Applications Without Spurious Modes”; 2005 IEEE Ultrasonics Symposium; pp. 1061-1064.

Affiliated with

Also associated with

Rating

SAW filter operable in a piston mode does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with SAW filter operable in a piston mode, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and SAW filter operable in a piston mode will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4116088