Principle and application of ball SAW devices |
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| Authors: | Kazushi Yamanaka Noritaka Nakaso Takeshi Fukiura Dong Youn Sim |
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| Affiliation: | 1. Tohoku University, Japan;2. JST, CREST, Japan;3. Toppan Printing, Japan;4. Yamatake Corporation, Japan;5. Ball Semiconductor Inc., Japan |
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| Abstract: | A thin beam of waves usually diverges due to diffraction, which is a limitation of any device using such waves. However, a surface acoustic wave (SAW) on a sphere with an appropriate aperture does not diverge but is collimated, realizing ultra‐multiple roundtrips along an equator of the sphere. This effect is caused by the balance between diffraction and focusing on a spherical surface, and it enables realization of high‐performance ball SAW sensors. © 2009 Wiley Periodicals, Inc. Electr Eng Jpn, 168(1): 41–51, 2009; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20817 |
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| Keywords: | surface acoustic wave naturally collimated beam sphere multiple roundtrips |
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