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High temperature stable GHz-range low-loss wide band transducers and filter using SiO2/LiNbO3,LiTaO3

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4 Author(s)
Yamanouchi, K. ; Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan ; Meguro, T. ; Wagatsuma, Yasuo ; Satoh, H.

SAW substrates with high coupling coefficients, low propagation attenuations, and small temperature coefficients in the GHz frequency range are theoretically and experimentally investigated. The experimental results show a very low propagation loss of 0.02 dB/λ0 and larger K2 than those of the substrates of LiNbO3 and LiTaO3 at temperature coefficients of the frequency (TCFs) of below -5 p.p.m./°C at the 1~2-GHz range. The low-loss filter results using internal reflection types of IDT show an insertion loss of about 2.9 dB at 1 GHz and 4.9 dB at 2 GHz under TCFs of 0 and +20 p.p.m./°C. These materials are applicable for devices at GHz range because SiO2 thickness is very thin and the center frequency shift of the filter vs. SiO2 thickness is very small

Published in:

Ultrasonics Symposium, 1991. Proceedings., IEEE 1991

Date of Conference:

8-11 Dec 1991

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