Surface acoustic wave element

Details Surface acoustic wave element Surface acoustic wave element

1998-03-23

2000-11-28

Ramirez, Nestor

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310360, H01L 4104

Patent

active

061539619

ABSTRACT:
A surface acoustic wave element having a cut-out angle from a langasite single crystal and a direction of propagating a surface acoustic wave of (180.degree.+.alpha., 40.degree.+.beta., 20.degree.+.gamma.) in Eulerian angles where .alpha.=-2.degree. to +6.degree., .beta.=-4.degree. to +9.degree., and .gamma.=-1.degree. to +9.degree.; of (0.degree.+.alpha., 140.degree.+.beta., 24.degree.+.gamma.) where .alpha.=-6.degree. to +6.degree., .beta.=-5.degree. to +5.degree., and .gamma.=-5.degree. to +5.degree.; or of (9.degree.+.alpha., 150.degree.+.beta., 37.degree.+.gamma.) where .alpha.=-5.degree. to +5.degree., .beta.=-5.degree. to +5.degree., and .gamma.=-5.degree. to +5.degree.. The element may be used in a filter that selects the frequency used in a communication device or a resonator that is used in a highly stabilized oscillator. The surface acoustic wave element has a chemically stable substrate material, a small temperature coefficient of delay, and a comparatively large electromechanical coupling coefficient.

REFERENCES:
patent: 5731748 (1998-03-01), Tada
patent: 5917265 (1999-06-01), Naumenko et al.
patent: 6005325 (1999-12-01), Inoue et al.
"Temperature Stability of SAW on Langasite Single Crystals", Inoue et al, Advanced Products Development Center, TDK Corp. Jul. 1998 IEEE Ultasonics Symposium. pp. 301-306.
"Numerical and Experimental Investigation SAW in Langasite", Yakovkin et al, Jun. 1995 Ultrasonics Symposium. pp. 389-392.
M. F. Dubovnik, et al, 1994 IEEE International Frequency Control Symposium, vol. 48, pp. 43-47, "Langasite (La.sub.3 Ga.sub.5 SiO.sub.14), An Optical Piezoelectric: Grouwth and Properties", Jan. 1994.
N. F. Naumenko, National Conference on Acoustoelectronics, 1 page, "Saw and Leaky Waves in a New Piezoelectric Crystal of Langasite", May 23, 1994 (English Abstract only).
S. Sakharov, et al., 1995 IEEE International Frequency Control Symposium, pp. 647-652, "New Data on Temperature Stabilyty and Acoustical Losses of Langasite Crystals", May 1995.

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