KNbO/sub 3/的超高机电耦合和零温度特性及其在低损耗宽带滤波器中的应用

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI:10.1109/ULTSYM.1997.663017

H. Odagawa, Takeshi Matsumura, K. Yamanouchi

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引用次数: 5

摘要

本文介绍了一种在铌酸钾(KNbO/sub 3/)衬底上传播的超高机电耦合声表面波及其在低损耗、宽带和温度稳定声表面波滤波器中的应用。KNbO/sub 3/具有较大的压电常数。从理论和实验上得到了y切割x传播衬底中SAW的机电耦合系数(K/sup 2/)为0.53。它大约是LiNbO/ sub3 /的10倍。此外，我们还获得了旋转Y型切割基板在室温附近的零温度特性。实验结果表明，宽带SAW滤波器具有低损耗和温度稳定的特点。带宽约为20%，插入损耗小于2/spl sim/ 6db。采用Y-cut KNbO/sub / 3的梯形滤波器的仿真结果表明，该滤波器的带宽为40%。

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Super high electromechanical coupling and zero-temperature characteristics of KNbO/sub 3/ and its applications for low-loss wide band filters

This paper describes a super high electromechanical coupling SAW propagating on potassium niobate (KNbO/sub 3/) substrate and its applications for low-loss, wide band and temperature stable SAW filters. KNbO/sub 3/ has large piezoelectric constants. We obtained the electromechanical coupling coefficient (K/sup 2/) of 0.53 for SAW in Y-cut X-propagating substrate theoretically and experimentally. It is about 10 times as large as that in LiNbO/sub 3/. Moreover, we obtained the zero temperature characteristics around room temperature in rotated Y cut substrate. Experimental results of wide band SAW filters show low loss and temperature stable characteristics. The bandwidth is about 20% and insertion losses are less than 2/spl sim/6 dB. Simulation result of ladder type filter using Y-cut KNbO/sub 3/, shows the bandwidth of 40%.

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来源期刊

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

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