Conjugately matched acoustic wave transducers and method

Details Conjugately matched acoustic wave transducers and method Conjugately matched acoustic wave transducers and method

1993-02-16

1994-08-02

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 310313R, 310313D, H03H 964

Patent

active

053349601

ABSTRACT:
A filter device comprises an acoustic wave propagating substrate having an effective coupling coefficient k.sup.2 and having a first filter and a second filter disposed on the acoustic wave propagating substrate. The first filter comprises a first electro-acoustic transducer and a first acousto-electric transducer, both disposed on the acoustic wave propagating substrate. The first acousto-electric transducer comprises N.sub.1 many electrode pairs, wherein N.sub.1 .gtoreq.C/k.sup.2. C is a constant having a value in the range from 1 to 2. The first acousto-electric transducer is acoustically coupled to the first electro-acoustic transducer. The second filter comprises a second electro-acoustic transducer and a second acousto-electric transducer, both disposed on the acoustic wave propagating substrate. The second electro-acoustic transducer is electrically coupled to the first acousto-electric transducer. The second electro-acoustic transducer comprises N.sub.2 many electrode pairs, wherein N.sub.2 <C/k.sup.2. The second acousto-electric transducer is acoustically coupled to the second electro-acoustic transducer.

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An article entitled "Propagation and Amplification of Rayleigh Waves and Piezoelectric Leaky Surface Waves in LiNbO3", K. Yananouchi et al., Journal of Applied Physics vol. 43, No. 3, Mar. 1972, pp. 856-862.
An article entitled "Sh-type and Rayleigh-Type Surface Waves on Rotated Y-Cut LiTaO3" K. Nakamura et al., 1977 IEEE Ultrasonics Symposium Proceedings, pp. 819-822.

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