Acoustic surface wave device

Details Acoustic surface wave device Acoustic surface wave device

1983-07-06

1985-07-23

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333149, 333196, H03H 9145, H03H 964

Patent

active

045311072

ABSTRACT:
Acoustic surface wave device comprising a lower electrode disposed on an elastic substrate and an upper electrode consisting of two comb-shaped electrodes disposed apart from each other, opposite to said lower electrode through a piezoelectric film covering said lower electrode, at least one of said lower and upper electrodes being constructed as an apodized electrode.

REFERENCES:
patent: 3750027 (1973-07-01), Hartmann
patent: 3828283 (1974-08-01), Daniel
patent: 4363990 (1982-12-01), Yamazaki et al.
Matthews--"Surface Wave Filters", John Wiley and Sons, New York, 1977; pp. 120-123, 350-353.
Shimizu et al.--"Unidirectional Surface-Acoustic-Wave Transducers with AznO Film on a Glass Substrate", Electronics Letters, Jun. 23, 1977, vol. 13, No. 13, p. 384.
Claiborne et al.--"Low Loss Filters Using Unidirectional Transducer Technology", Conference: Proceedings of the 1979 International Symposium on Circuits and Systems, Tokyo, Japan, Jul. 17-19, 1979; pp. 609-612.
Toda et al.--"Lamb-Wave Device with Three Operation Modes", Electronics Letters, Nov. 23, 1978, vol. 14, No. 24; pp. 747-748.

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