Effects of electrode materials on natural unidirectionality of langasite

Shou Qi Wang, Ryouhei Kimura, Kunio Yamaguchi, Jiro Harada, Satoshi Uda, Koji Hasegawa

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


In this study, we carried out experimental research on the directivity of surface acoustic wave (SAW) filters with Al, W and Ta electrodes formed on langasite single-crystal wafers, in order to find electrode materials that make the natural unidirectionality disappear. The results proved that by using W and Ta, the natural unidirectionality disappears at the normalized thickness (h/λ) of 0.033-0.037. This suggests a potential application of these metals as electrode materials for langasite-based SAW filters so that the design process of the single-phase unidirectional transducer (SPUDT) filter can be simplified by using tools for conventional SPUDT filters.

Original languageEnglish
Pages (from-to)5710-5714
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number9 B
Publication statusPublished - 2001 Sep
Externally publishedYes


  • Electrode material
  • Langasite
  • SAW filter

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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