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US 6,278,219 B1Granted
Surface acoustic wave reflecting device having reflectance similar to the hamming function
AssigneeFujitsu Limited
InventorsYasufumi Kaneda, Jun Tsutsumi, Kenya Hashimoto, Tatsuya Omori, Motoyuki Tajima, Masatsune Yamaguchi
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Abstract
A surface acoustic wave device which reflects a surface acoustic wave is provided. The reflector of the surface acoustic wave device includes electrode fingers. The electrode fingers are disposed at predetermined intervals d, and are divided into five groups by the width. The widths w of the electrode fingers are varied between widths w1, w2, and w3, so that the reflectance becomes similar to the Hamming function.
Claims7
A surface acoustic wave device comprising:
- a piezoelectric substrate which transmits a surface acoustic wave;
- and
- a plurality of reflection portions formed on the piezoelectric substrate,
- wherein the plurality of reflection portions are divided into groups, each of the groups includes electrode fingers, the groups have particular widths of the electrode fingers,
- an electrode finger width is set for each of the groups so that a stepwise change of reflectivity depending on the number of electrode fingers approximates the Hamming function, and
- the electrode fingers in an identical group have an identical width and are spaced apart from each other at an identical interval.
3 more elements
Dependencies are inferred from the claim text.