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 wave 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 ultramultiple 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)1177-1185+7
JournalIEEJ Transactions on Electronics, Information and Systems
Issue number8
Publication statusPublished - 2007
Externally publishedYes


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

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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