RF filter using boundary acoustic wave

Hajime Kando; Daisuke Yamamoto; Hikari Tochishita; Michio Kadota

doi:10.1143/JJAP.45.4651

RF filter using boundary acoustic wave

Hajime Kando, Daisuke Yamamoto, Hikari Tochishita, Michio Kadota

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

28 Citations (Scopus)

Abstract

In this paper, we 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/Au-electrode/LiNbO₃ substrate, is proposed. The ladder filter used in this paper had this structure. By changing the propagation angle of the acoustic wave, the electromechanical coupling factor k² range from 0 to 16% was obtained, as well as a normalized bandwidth range 0.67 to 1.85 fold as large as that of a 36-46°Y-X LiTaO ₃ leaky surface acoustic wave (LT-LSAW) filter. In addition, an excellent temperature coefficient of delay time (TCP = 25 ppm/°C) and a large mutual coupling coefficient κ₁₂ (= 0.15) were also obtained.

Original language	English
Pages (from-to)	4651-4654
Number of pages	4
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	45
Issue number	5 B
DOIs	https://doi.org/10.1143/JJAP.45.4651
Publication status	Published - 2006 May 25
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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10.1143/JJAP.45.4651

Cite this

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title = "RF filter using boundary acoustic wave",

abstract = "In this paper, we 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/Au-electrode/LiNbO3 substrate, is proposed. The ladder filter used in this paper had this structure. By changing the propagation angle of the acoustic wave, the electromechanical coupling factor k2 range from 0 to 16% was obtained, as well as a normalized bandwidth range 0.67 to 1.85 fold as large as that of a 36-46°Y-X LiTaO 3 leaky surface acoustic wave (LT-LSAW) filter. In addition, an excellent temperature coefficient of delay time (TCP = 25 ppm/°C) and a large mutual coupling coefficient κ12 (= 0.15) were also obtained.",

keywords = "Boundary acoustic wave, Electromechanical coupling factor adustment, Power flow angle, RF filter, SH wave",

author = "Hajime Kando and Daisuke Yamamoto and Hikari Tochishita and Michio Kadota",

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T1 - RF filter using boundary acoustic wave

AU - Kando, Hajime

AU - Yamamoto, Daisuke

AU - Tochishita, Hikari

AU - Kadota, Michio

PY - 2006/5/25

Y1 - 2006/5/25

N2 - In this paper, we 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/Au-electrode/LiNbO3 substrate, is proposed. The ladder filter used in this paper had this structure. By changing the propagation angle of the acoustic wave, the electromechanical coupling factor k2 range from 0 to 16% was obtained, as well as a normalized bandwidth range 0.67 to 1.85 fold as large as that of a 36-46°Y-X LiTaO 3 leaky surface acoustic wave (LT-LSAW) filter. In addition, an excellent temperature coefficient of delay time (TCP = 25 ppm/°C) and a large mutual coupling coefficient κ12 (= 0.15) were also obtained.

AB - In this paper, we 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/Au-electrode/LiNbO3 substrate, is proposed. The ladder filter used in this paper had this structure. By changing the propagation angle of the acoustic wave, the electromechanical coupling factor k2 range from 0 to 16% was obtained, as well as a normalized bandwidth range 0.67 to 1.85 fold as large as that of a 36-46°Y-X LiTaO 3 leaky surface acoustic wave (LT-LSAW) filter. In addition, an excellent temperature coefficient of delay time (TCP = 25 ppm/°C) and a large mutual coupling coefficient κ12 (= 0.15) were also obtained.

KW - Boundary acoustic wave

KW - Electromechanical coupling factor adustment

KW - Power flow angle

KW - RF filter

KW - SH wave

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IS - 5 B

ER -

RF filter using boundary acoustic wave

Abstract

Keywords

ASJC Scopus subject areas

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