Lamb-wave resonator and oscillator

Details Lamb-wave resonator and oscillator Lamb-wave resonator and oscillator

2009-03-02

2011-10-11

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C310S361000, C310S31300R, C310S31300R, C333S195000

Reexamination Certificate

active

08035463

ABSTRACT:
A Lamb-wave resonator includes: a piezoelectric substrate; an interdigital transducer electrode formed on a main surface of the piezoelectric substrate, the interdigital transducer electrode including a plurality of electrode finger elements being interdigitated, and a bus bar electrode coupling the plurality of electrode finger elements; and a pair of reflectors disposed on opposite sides of the interdigital transducer electrode in a propagation direction of a Lamb wave. A thickness t of the piezoelectric substrate is in a range expressed by 0<t/λ≦3 where a wavelength of the Lamb wave to be excited is represented as λ. If a width of the bus bar electrode is Wb, a distance from the electrode finger elements to the bus bar electrode is Wg, in an orthogonal coordinate with an x axis indicating the distance Wg and a y axis indicating the width Wb, both the distance Wg and the width Wb are in one of a first range and a second range. The first range is surrounded by a circular arc expressed by an equation of a circle (x−10)2+(y+12.7)2=192, and Wg≧1λ and Wb≧1λ, and the second range is surrounded by a straight line connecting coordinates of (1.0, 7.0), (1.0, 20.0), (2.0, 21.0), (4.5, 22.5), (7.5, 25.0), (12.0, 23.0), (15.5, 20.8), (18.0, 14.0), (20.0, 7.0), (16.0, 10.0), (15.0, 9.0), (12.5, 8.0), (10.0, 8.0), (8.0, 9.0), (7.0, 8.0), (5.0, 8.0), (3.5, 10.0), (2.0, 10.0), (1.0, 7.0) in this order if the coordinates are represented as (Wg, Wb).

REFERENCES:
patent: 6005326 (1999-12-01), Yoshimoto et al.
patent: 6040651 (2000-03-01), Yoshimoto et al.
patent: 7327070 (2008-02-01), Tanaka
patent: 2006/0152107 (2006-07-01), Tanaka
patent: 2006/0255884 (2006-11-01), Tanaka
patent: 2007/0188047 (2007-08-01), Tanaka
patent: 09-275326 (1997-10-01), None
patent: A-10-126211 (1998-05-01), None
patent: A-2003-188676 (2003-07-01), None
patent: A-2003-258596 (2003-09-01), None
patent: A-2008-54163 (2008-03-01), None
V. Yantchev et al.; “Design and Fabrication of Thin Film Lamb Wave Resonators Utilizing Longitudinal Wave and Interdigital Transducers”; 2005 IEEE Ultrasonics Symposium, vol. 3, pp. 1580-1583, Sep. 18-21, 2005.
J. Bjurstrom et al.; “Lateral-Field-Excited Thin-Film Lamb Wave Resonator”; Applied Physics Letters 86, Apr. 5, 2005, pp. 154103-1 to 154103-3.
Ultrasound Handbook Editorial Committee;Choonpa Binran(Ultrasound Handbook); 1999; pp. 62-71.
150thCommittee of the Nippon Academy Promotion Association Acoustic Wave Element Technique; Acoustic Wave Element Technical Handbook; 1991; pp. 148-158.
Nakagawa et al; Temperature Characteristics of the Substrate for Lamb Wave Type Elastic Wave Devices; IEICE Transactions On Electronics; 2006; pp. 34-39; vol. J-89C, No. 1.

Affiliated with

Also associated with

Rating

Lamb-wave resonator and oscillator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Lamb-wave resonator and oscillator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lamb-wave resonator and oscillator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4295828