RF filter using boundary acoustic wave

Hajime Kando; Daisuke Yamamoto; Masakazu Mimura; Tetsuya Oda; Atushi Shimizu; Kazunori Shimoda; Eiichi Takata; Toshiyuki Fuyutsume; Ryuichi Kubo; Michio Kadota

doi:10.1109/ULTSYM.2006.59

RF filter using boundary acoustic wave

Hajime Kando, Daisuke Yamamoto, Masakazu Mimura, Tetsuya Oda, Atushi Shimizu, Kazunori Shimoda, Eiichi Takata, Toshiyuki Fuyutsume, Ryuichi Kubo, Michio Kadota

ENG - Robotics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

32 Citations (Scopus)

Abstract

Authors report a new structure of a shear horizontal (SH) type boundary acoustic wave for cellular phone applications. Such a structure composed of electrodes with a low shear wave velocity between two materials, namely, the SiO₂ film/high density electrode/LiNbO₃ substrate, is proposed. The unique feature of this structure is that it does not require a cavity on the substrate surface. The ladder filter and the longitudinal coupled multiple mode filter composed of this structure is reported. By changing the propagation angle of the acoustic wave, the electromechanical coupling factor k² ranged from 0 to 16% as well as a normalized bandwidth of 0.67 to 1.85 fold as large as that of a 36-46° Y-X LiTaO₃ leaky surface acoustic wave (LT-LSAW) filter. In addition, an excellent temperature coefficient of delay time (TCD=25 ppm/°C) and a large mutual coupling coefficient κ₁₂ (=0.15) were also obtained. The newly developed RF filter using this structure was very small and thin.

Original language	English
Title of host publication	2006 IEEE International Ultrasonics Symposium, IUS
Pages	188-191
Number of pages	4
DOIs	https://doi.org/10.1109/ULTSYM.2006.59
Publication status	Published - 2006 Dec 1
Event	2006 IEEE International Ultrasonics Symposium, IUS - Vancouver, BC, Canada Duration: 2006 Oct 3 → 2006 Oct 6

Publication series

Name	Proceedings - IEEE Ultrasonics Symposium
Volume	1
ISSN (Print)	1051-0117

Other

Other	2006 IEEE International Ultrasonics Symposium, IUS
Country	Canada
City	Vancouver, BC
Period	06/10/3 → 06/10/6

Keywords

Boundary acoustic wave
Electromechanical coupling factor adjustment
Power flow angle
RF filter
SH wave

ASJC Scopus subject areas

Acoustics and Ultrasonics

Access to Document

10.1109/ULTSYM.2006.59

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Kando, H., Yamamoto, D., Mimura, M., Oda, T., Shimizu, A., Shimoda, K., Takata, E., Fuyutsume, T., Kubo, R., & Kadota, M. (2006). RF filter using boundary acoustic wave. In 2006 IEEE International Ultrasonics Symposium, IUS (pp. 188-191). [4151915] (Proceedings - IEEE Ultrasonics Symposium; Vol. 1). https://doi.org/10.1109/ULTSYM.2006.59

RF filter using boundary acoustic wave. / Kando, Hajime; Yamamoto, Daisuke; Mimura, Masakazu; Oda, Tetsuya; Shimizu, Atushi; Shimoda, Kazunori; Takata, Eiichi; Fuyutsume, Toshiyuki; Kubo, Ryuichi; Kadota, Michio.

2006 IEEE International Ultrasonics Symposium, IUS. 2006. p. 188-191 4151915 (Proceedings - IEEE Ultrasonics Symposium; Vol. 1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Kando, H, Yamamoto, D, Mimura, M, Oda, T, Shimizu, A, Shimoda, K, Takata, E, Fuyutsume, T, Kubo, R & Kadota, M 2006, RF filter using boundary acoustic wave. in 2006 IEEE International Ultrasonics Symposium, IUS., 4151915, Proceedings - IEEE Ultrasonics Symposium, vol. 1, pp. 188-191, 2006 IEEE International Ultrasonics Symposium, IUS, Vancouver, BC, Canada, 06/10/3. https://doi.org/10.1109/ULTSYM.2006.59

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abstract = "Authors report a new structure of a shear horizontal (SH) type boundary acoustic wave for cellular phone applications. Such a structure composed of electrodes with a low shear wave velocity between two materials, namely, the SiO2 film/high density electrode/LiNbO3 substrate, is proposed. The unique feature of this structure is that it does not require a cavity on the substrate surface. The ladder filter and the longitudinal coupled multiple mode filter composed of this structure is reported. By changing the propagation angle of the acoustic wave, the electromechanical coupling factor k2 ranged from 0 to 16% as well as a normalized bandwidth of 0.67 to 1.85 fold as large as that of a 36-46° Y-X LiTaO3 leaky surface acoustic wave (LT-LSAW) filter. In addition, an excellent temperature coefficient of delay time (TCD=25 ppm/°C) and a large mutual coupling coefficient κ12 (=0.15) were also obtained. The newly developed RF filter using this structure was very small and thin.",

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author = "Hajime Kando and Daisuke Yamamoto and Masakazu Mimura and Tetsuya Oda and Atushi Shimizu and Kazunori Shimoda and Eiichi Takata and Toshiyuki Fuyutsume and Ryuichi Kubo and Michio Kadota",

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AU - Takata, Eiichi

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AU - Kadota, Michio

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AB - Authors report a new structure of a shear horizontal (SH) type boundary acoustic wave for cellular phone applications. Such a structure composed of electrodes with a low shear wave velocity between two materials, namely, the SiO2 film/high density electrode/LiNbO3 substrate, is proposed. The unique feature of this structure is that it does not require a cavity on the substrate surface. The ladder filter and the longitudinal coupled multiple mode filter composed of this structure is reported. By changing the propagation angle of the acoustic wave, the electromechanical coupling factor k2 ranged from 0 to 16% as well as a normalized bandwidth of 0.67 to 1.85 fold as large as that of a 36-46° Y-X LiTaO3 leaky surface acoustic wave (LT-LSAW) filter. In addition, an excellent temperature coefficient of delay time (TCD=25 ppm/°C) and a large mutual coupling coefficient κ12 (=0.15) were also obtained. The newly developed RF filter using this structure was very small and thin.

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