Principle and application of ball SAW devices

Kazushi Yamanaka, Noritaka Nakaso, Takeshi Fukiura, Dong Youn Sim

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)41-51
Number of pages11
JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
Issue number1
Publication statusPublished - 2009 Jul 15


  • Multiple roundtrips
  • Naturally collimated beam
  • Sphere
  • Surface acoustic wave

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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