Small surface acoustic wave duplexer for wide-band code-division multiple access full-band system having good temperature characteristics

Michio Kadota; Takeshi Nakao; Kenji Nishiyama; Shunsuke Kido; Masanori Kato; Ryoichi Omote; Hiroshi Yonekura; Norihiko Takada; Ryoichi Kita

doi:10.1143/JJAP.46.4714

Small surface acoustic wave duplexer for wide-band code-division multiple access full-band system having good temperature characteristics

Michio Kadota, Takeshi Nakao, Kenji Nishiyama, Shunsuke Kido, Masanori Kato, Ryoichi Omote, Hiroshi Yonekura, Norihiko Takada, Ryoichi Kita

ENG - Robotics

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

73 Citations (Scopus)

Abstract

A small surface acoustic wave (SAW) duplexer for a wide-band code-division multiple access (W-CDMA) system with a good temperature coefficient of frequency (TCF) has been required. However, the conventional SAW duplexer for W-CDMA using Al electrode/50-70° YX-LiNbO₃ is large (3.8 x 3.8 mm ²) and its TCF is not good (-80ppm/°C). When a SiO₂ film is deposited on this substrate to improve its TCF, good frequency characteristics cannot be realized. Thus, by using a new structure such as a flattened SiO₂ film/Cu electrode/substrate structure to improve the TCF, YX-LiNbO₃ substrate to obtain a large coupling factor, and flip-chip bonding to miniaturize the duplexer, a small (3 x 2.5 mm²) SAW duplexer having a low insertion loss and a good TCF has been realized for the first time.

Original language	English
Pages (from-to)	4714-4717
Number of pages	4
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	46
Issue number	7 B
DOIs	https://doi.org/10.1143/JJAP.46.4714
Publication status	Published - 2007 Jul 26

Keywords

Duplexer
Excellent TCF
Love wave
W-CDMA

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.1143/JJAP.46.4714

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Cite this

Kadota, M., Nakao, T., Nishiyama, K., Kido, S., Kato, M., Omote, R., Yonekura, H., Takada, N., & Kita, R. (2007). Small surface acoustic wave duplexer for wide-band code-division multiple access full-band system having good temperature characteristics. Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, 46(7 B), 4714-4717. https://doi.org/10.1143/JJAP.46.4714

Small surface acoustic wave duplexer for wide-band code-division multiple access full-band system having good temperature characteristics. / Kadota, Michio; Nakao, Takeshi; Nishiyama, Kenji; Kido, Shunsuke; Kato, Masanori; Omote, Ryoichi; Yonekura, Hiroshi; Takada, Norihiko; Kita, Ryoichi.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 46, No. 7 B, 26.07.2007, p. 4714-4717.

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

Kadota, M, Nakao, T, Nishiyama, K, Kido, S, Kato, M, Omote, R, Yonekura, H, Takada, N & Kita, R 2007, 'Small surface acoustic wave duplexer for wide-band code-division multiple access full-band system having good temperature characteristics', Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, vol. 46, no. 7 B, pp. 4714-4717. https://doi.org/10.1143/JJAP.46.4714

Kadota, Michio ; Nakao, Takeshi ; Nishiyama, Kenji ; Kido, Shunsuke ; Kato, Masanori ; Omote, Ryoichi ; Yonekura, Hiroshi ; Takada, Norihiko ; Kita, Ryoichi. / Small surface acoustic wave duplexer for wide-band code-division multiple access full-band system having good temperature characteristics. In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers. 2007 ; Vol. 46, No. 7 B. pp. 4714-4717.

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