Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1997-06-04
1999-06-22
Pascal, Robert
Wave transmission lines and networks
Coupling networks
Electromechanical filter
310313A, 310313B, H03H 964, H03H 9145
Patent
active
059146451
ABSTRACT:
In a surface acoustic wave device comprising a substrate of lithium tantalate or lithium niobate, and interdigital electrodes formed on the substrate and made of a thin film consisting primarily of aluminum, the interdigital electrodes are optimized in the ratio of the thickness of the film to the period of a plurality of electrode digits connected to a common terminal with propagation loss taken as an objective function. The ratio is set in the range of 0.03 to 0.10 to ensure a lower propagation loss than in the prior art.
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Japanese Journal of Applied Physics, vol. 29, (1990) Supplement 29-1, pp. 119-121, "Characteristic of Leaky Surface Waves Propagating on Li.sub.2 B.sub.4 O.sub.7 Substrate with a Thin Aluminum Plate," by Masao Murota and Yasutaka Shimizu.
Japanese Journal of Applied Physics, vol. 30, (1991) Supplement 30-1, pp. 143-145, "Effects of aluminum Thickness on the Temperature Characteristics of Leaky Surface Wave Filters on LST-cut Quartz Substrate," by Masao Murota, Tetsuya Hirano, C.S. Lam, D.E. Holt and Yasutaka Shimizu.
Kobayashi Yasumi
Matsui Kuniyuki
Okano Hiroshi
Shibata Kenichi
Tanaka Naoki
Pascal Robert
Sanyo Electric Co,. Ltd.
Summons Barbara
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