Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1997-03-25
1999-12-21
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310360, H01L 4108
Patent
active
060053259
ABSTRACT:
In a surface acoustic wave device comprising an inter-digital electrode on a surface of a substrate wherein said substrate is a langasite single crystal belonging to a point group 32, a combination of a cut angle of the substrate out of the single crystal and-a propagation direction of surface acoustic waves is optimized. This makes it possible to achieve a surface acoustic wave device comprising a substrate having a temperature coefficient of SAW velocity, TCV, the absolute value of which is small, a large electromechanical coupling factor k.sup.2, and low SAW velocity. It is thus possible to achieve a filter device which is improved in terms of temperature stability, has a wide passband, and is reduced in size, especially an intermediate-frequency surface acoustic wave filter having improved characteristics best-fitted for mobile communication terminal equipment.
REFERENCES:
patent: 5557968 (1996-09-01), Krempl et al.
patent: 5821673 (1998-10-01), Pisareusky et al.
patent: 5917265 (1999-06-01), Naumenko et al.
1995 IEEE Ultrasonics Symposium, pp. 389-392, 1995, I. B. Yakovkin, et al., "Numerical and Experimental Investigation Saw in Langasite".
1993 IEEE International Frequency Control Symposium, pp. 348-350, 1993, I. N. Silvestrova, et al., "Present State of La.sub.3 Ga.sub.5 SiO.sub.14 -Research".
1992 IEEE Ultrasonics Symposium, pp. 403-412, 1992, J. G. Gualtieri, et al., "Piezoelectoric Materials for Saw Applications".
1994 IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 41, No. 1, pp. 53-59, Jan. 1, 1994, John G. Gualtieri, et al., "Piezoelectric Materials for Acoustic Wave Applications".
1994 IEEE International Frequency Control Symposium, pp. 48-57, 1994, B. Capelle, et al., "Study of Gallium Phosphate and Langasite Crystals and Resonators by X Ray Topography".
1994 IEEE International Frequency Control Symposium, pp. 58-71, 1994, J. Detaint, et al., "Bulk Wave Propagation and Energy Trapping in the New Thermally Compensated Materials with Trigonal Symmetry".
1994 IEEE International Frequency Control Symposium, pp. 43-47, 1994, M. F. Dubovik, et al., "Langasite (La.sub.3 Ga.sub.5 SiO.sub.14) an Optical Piezoelectric: Growth and Properties".
1995 IEEE Ultrasonics Symposium, pp. 409-412, 1995, K. S. Aleksandrov, et al., "Effects of Static Electric Field and of Mechanical Pressure on Surface Acoustic Waves Propagation in La.sub.3 Ga.sub.5 SiO.sub.14 Piezolectric Single Crystals".
The 17.sup.th Symposium Preprint on the Fundamentals and Applications of Ultrasonic Electronics, pp. 307-308, "A Study on Saw Propagation Characteristics on a Langasite Crystal Plate".
The 51th Study Meeting in the 150.sup.th Committee of Surface Acoustic Wave Device Technology, The Japan Society for the Promotion of Science, pp. 21-27, Hiroaki Satoh, et al., "Propagation Direction Dependence of Rayleigh Waves on a Langasite Crystal Plate".
The 17.sup.th Symposium Preprint on the Fundamentals and Applications of Ultrasonic Electronics, pp. 305-306, Takashi Sato, et al., "Propagation Characteristics of Surface Acoustic Waves on La.sub.3 Ga.sub.5 SiO.sub.14 ".
Inoue Kenji
Sato Katsuo
Budd Mark O.
TDK Corporation
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