基于KNbO/sub - 3/衬底的高效弹性卷积器

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI:10.1109/ULTSYM.1997.663034

K. Yamanouchi, H. Odagawa, K. Morozumi, Y. Cho

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引用次数: 4

摘要

弹性卷积器是扩频通信系统中信号处理器件的重要组成部分。在扩频和下一阶段通信系统中，需要更高效的卷积器。高耦合系数对于声表面波卷积器等宽带高效声表面波器件是非常重要的。铌酸钾(KNbO/sub 3/)对表面声波具有较大的压电常数和非常大的机电耦合系数(K/sup 2/)，为0.53，约为LiNbO/sub 3/的10倍。因此，基于KNbO/sub - 3/衬底的高效弹性SAW卷积器被寄予厚望。本文采用旋转60/spl度/ y切割，x传播的KNbO/sub /基片作为卷积器。实验结果表明，采用60 /spl度/Y-X KNbO/sub - 3/的卷积器的效率比采用Y-Z LiNbO/sub - 3/的卷积器高15 dB。

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High efficiency elastic convolver using KNbO/sub 3/ substrate

Elastic convolvers are very important for signal processing devices of the spread spectrum communication (SSC) systems. The better efficient convolvers are required for the application for the spread spectrum and next stage communication systems. A high value of coupling coefficient is very important for wideband and high efficiency SAW devices such as SAW convolvers. Potassium niobate (KNbO/sub 3/) has large piezoelectric constants and very large electromechanical coupling coefficient (K/sup 2/) of 0.53 for the surface acoustic waves which is about 10 times larger than that of LiNbO/sub 3/. Therefore the high efficient elastic SAW convolvers using KNbO/sub 3/ substrates are expected. In this paper, the rotated 60/spl deg/ Y-cut, X-propagating KNbO/sub 3/ substrates are used for a convolver. The experimental results show that the efficiency of the convolver using 60 /spl deg/Y-X KNbO/sub 3/ is 15 dB higher than of he convolver using Y-Z LiNbO/sub 3/.

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来源期刊

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)

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