Optimal cut for wave propagation surface on langanite substrate

Details Optimal cut for wave propagation surface on langanite substrate Optimal cut for wave propagation surface on langanite substrate

1999-05-18

2000-04-25

Ramirez, Nestor

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310360, H01L 4108

Patent

active

060547944

ABSTRACT:
A lanthanum gallium niobate single crystal substrate, referred to as langanite, 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 langanite piezoelectric substrate. The surface acoustic wave propagates in a direction generally perpendicular to electrodes of the IDT. The langanite crystal cut and wave propagation directions are defined which reduce insertion loss and frequency response distortion due to SAW transduction, diffraction, and beam steering, while achieving improved temperature stability SAW device as compared to other commonly used crystal substrates. A low power flow angle and reduced level of diffraction is also achieved.

REFERENCES:
patent: 4672255 (1987-06-01), Suzuki et al.
patent: 5905325 (1999-05-01), Naumenko et al.
"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.

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