Surface acoustic wave device

Details Surface acoustic wave device Surface acoustic wave device

2006-07-11

2006-07-11

Wambley, Patrick (Department: 2819)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C310S31300R

Reexamination Certificate

active

07075390

ABSTRACT:
The surface acoustic wave device has the surface acoustic wave transducer, which consists of the positive electrode finger102, the negative electrode finger204, and the floating electrode300, which are formed on the surface of the langasite single crystal substrate, where the substrate orientation and the surface acoustic wave propagation direction are chosen so that it may have the natural unidirectional property. When the wavelength of the surface acoustic wave is λ, each above-mentioned electrode is formed along the surface acoustic wave propagation direction, so that the width of above-mentioned positive electrode finger and the negative electrode finger may be about λ/8, the distance g between each center of the positive electrode finger and the floating electrode may be 13/40λ≦g≦14/40λ, and the width W of the floating electrode may be 11/40λ≦W≦13/40λ.

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Koji Hasegawa et al.; Kiban no ihosel wo mochila 1 houkousei dansei hyoumenha sudare jou denkyoku no mode ketsugou riron ni motozuku 1 kaiseki hou Transactions of the Electronics, Information and Communication Engineers, vol. J77-C-1, No. 6, pp. 398-404 May 25, 1994.
Koji Hasegawa et al.; “Coefficients of coupled-mode equations for a natural-single phase undirectional transducer and an electrode-width-difference-reversal-of-directivity transducer on a 50oY-24oX La3Ga5SiO14 substrate”Japanese Journal of Applied Physics, vol. 39, No. 5B, pp. 3020-3023, May 30, 2000.
Koji Hasegawa et al.: “Kiban no thousei wo mochilla 1 houkou sei dansel hyoumenha sudare jou denkyoku no mode ketsugou houteishiki no shoteisu no hybrid yugen youso hoyu nl yoru ketel hou” Transactions of the Instisute of Electronics, Information and Communicaitons Engineers, vol. J82-C-1, No. 13, pp. 735-743, Dec. 25, 1999.
V. B. Chvets. et al., “Design of Sawfilters on Langasite,” 1999 IEEE Ultrasonics Symposium, pp. 295-299.

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