Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1999-05-18
2000-06-06
Ramirez, Nestor
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
H01L 4108
Patent
active
060722649
ABSTRACT:
A lanthanum gallium silicate single crystal substrate, referred to as langasite, has a prescribed range of Euler angles for substrate and crystal orientation for improving signal processing for a surface acoustic wave (SAW) device. When a voltage is applied to an input interdigital transducer (IDT) of the SAW device, a surface acoustic wave is generated in the langasite piezoelectric substrate. The surface acoustic wave propagates in a direction generally perpendicular to electrodes of the IDT. The langasite crystal cut and wave propagation directions are defined which reduce insertion loss due to SAW transduction, diffraction, and beam steering. As a result, temperature stability for the SAW device is improved. A low power flow angle and reduced level of diffraction is also achieved.
REFERENCES:
patent: Re35204 (1996-04-01), Lewis
patent: 4159435 (1979-06-01), Lewis
patent: 4672255 (1987-06-01), Suzuki et al.
patent: 5130681 (1992-07-01), Ohnuki et al.
patent: 5565724 (1996-10-01), Hachigo et al.
patent: 5646468 (1997-07-01), Nakahata et al.
patent: 5821673 (1998-10-01), Pisarevsky et al.
patent: 5905325 (1999-05-01), Naumenko et al.
patent: 5917265 (1999-06-01), Naumenko et al.
"Numerical and Experimental Investigation SAW in Langasite", Yakovkin et al. 1995 IEEE Ultrasonics Symposium, pp. 389-392.
"Effects of Static Electric Field and of Mechanical Pressure on Surface Acoustic Waves Propagation in La3Ga5SiO14 Piezoelectric Single Crystals", Aleksandrov et al, 1995 IEEE Ultrasonics Symposium, p. 409-412.
"Optimal Cuts of Langasite for SAW Devices", N.F. Naumenko, Materials of Conference--"Acoustoelectronic STW Devices for Signal Processing", Sep. 6-8, 1990, Cherkassy (USSR), pp. 18-19 (Translation of attached Russian excerpt).
"Numerical Data and Plots into Depth" A.J. Slobodnik, Jr., E.D. Conway, Microwave Acoustics Handbook--vol. 1. Surface Wave Velocities, Office of Aerospace Research, United States Air Force, Microwave Physics Laboratory--Project 5635, Air Force Cambridge Research Laboratories, L.G. Hanscom Field, Bedford, Massachusetts, Physical Sciences Research Papers, No. 414, Mar. 1970, pp. 83 & 85.
"Langasite (La.sub.3 Ga.sub.5 SiO.sub.14)--An Optical Piezoelectric: Growth and Properties:", M.F. Dubovik, I.A. Andreyev, Yu.S. Shmaly, Institute for Single Crystals of Academic Science of Ukraine, Kharkov, 1994 IEEE International Frequency Control Symposium, pp. 43, 45-47.
"Quasilongitudinal Pseudosurface Acoustic Waves in Trigonal Crystals", A.I. Kozlov, Institute of Radioengineering and Electronics of Russian Academy of Sciences, Moscow, 1995 IEEE Ultrasonics Symposium, pp. 197-200.
"Temperature Characteristics of Langanite Bulk Wave Vibrations," P.A. Senjushenkov et al, 1996 IEEE International Frequency Control Symposium, pp. 137-140.
"Elastic, Piezoelectric, Dielectric Properties of La.sub.3 Ga.sub.5.5 Ta.sub.0.5 O.sub.14 Single Crystals," Yu V. Pisarevsky et al, 1998 IEEE International Frequency Control Symposium, pp. 742-747.
"Material and Resonator Properties of Langasite and Langatate: A Progress Report," R. C. Smythe, 1998 IEEE International Frequency Control Symposium, pp. 761-765.
Naumenko Natalya F.
Orlov Victor S.
Medley Peter
Ramirez Nestor
Sawtek Inc.
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