Surface acoustic wave device

Details Surface acoustic wave device Surface acoustic wave device

1982-08-05

1984-07-31

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333196, 310313C, H03H 925, H03H 964

Patent

active

044633270

ABSTRACT:
This Surface Acoustic Wave (SAW) filter has a tilted, interdigital transducer and a normal interdigital transducer separated from each other on a piezoelectric substrate. An input signal with a large bandwidth is applied to the tilted transducer, while an output signal is obtained from the normal transducer. Guaranteed attenuation can be greatly improved, and ripple in the pass band markedly reduced, by grounding one of the electrodes of the tilted transducer. This electrode is the one containing the longer of the two electrode fingers closest to the normal transducer.

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patent: 4066985 (1978-01-01), Kuny
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patent: 4203082 (1980-05-01), Tsukamoto et al.
patent: 4206380 (1980-06-01), Hazama et al.
patent: 4298849 (1981-11-01), Arneson
Meyer, P. C., "Low Shape Factor Filter Design Considerations," 1975, Ultrasonics Symposium Proceedings, IEEE, Cat. No. 75, CHO 994-4SU, p. 334.
Japan Electrocommunication Society, "17 MHZ Bandwidth SAW VSB Filter," Preliminary Report for the National Convention of the Electrocommunication Society in 1981, p. 1-68.

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