Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
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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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.
Kodama Toshikazu
Suzuki Hitoshi
Nussbaum Marvin L.
Tokyo Shibaura Denki Kabushiki Kaisha
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