Effects of electrode materials on natural unidirectionality of langasite

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

doi:10.1143/jjap.40.5710

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 journal › Article › peer-review

1 Citation (Scopus)

Abstract

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 language	English
Pages (from-to)	5710-5714
Number of pages	5
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	40
Issue number	9 B
DOIs	https://doi.org/10.1143/jjap.40.5710
Publication status	Published - 2001 Sep
Externally published	Yes

Keywords

Electrode material
Langasite
NSPUDT
SAW filter

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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Effects of electrode materials on natural unidirectionality of langasite. / Wang, Shou Qi; Kimura, Ryouhei; Yamaguchi, Kunio; Harada, Jiro; Uda, Satoshi; Hasegawa, Koji.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 40, No. 9 B, 09.2001, p. 5710-5714.

Research output: Contribution to journal › Article › peer-review

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