强压电基板上的低通带阶梯型SAW阻抗元件滤波器

1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI:10.1109/ULTSYM.1996.583770

V. Plessky, S. Kondratiev, C. Lambert

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引用次数: 4

摘要

讨论了降低36-LiTaO/sub - 3/衬底耦合系数的两种方法:(1)假电极换能器和(2)电极与衬底之间的SiO/sub - 2/子层。采用理论模态耦合(COM)模型寻找耦合降低两倍的条件。利用测试谐振式结构进行了COM参数提取实验，所得数据用于声表面波双工器的设计。

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Reduced passband ladder type SAW impedance element filters on strong piezoelectric substrates

Two ways of reducing coupling coefficient for 36-LiTaO/sub 3/ substrates are discussed: (1) a transducer with dummy electrodes and (2) an SiO/sub 2/ sublayer between the electrodes and the substrate. A theoretical coupling of modes (COM) model is used to find conditions for a twofold decrease of coupling. Experiments are made with test resonator-type structures for extraction of COM parameters and the obtained data are used for SAW duplexer design.

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1996 IEEE Ultrasonics Symposium. Proceedings

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