平衡型SAW滤波器的分析与改进

2002 IEEE Ultrasonics Symposium, 2002. Proceedings. Pub Date : 2002-10-08 DOI:10.1109/ULTSYM.2002.1193376

H. Nakamura, S. Tsuzuki, T. Yamada, T. Ishizaki

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引用次数: 4

摘要

分析了平衡型SAW滤波器平衡性能的退化机理。作者已经证实，输入和输出idt之间的寄生耦合使平衡特性下降。通过对寄生电容的假设，测量结果与仿真结果吻合较好。通过减小寄生电容可以改善其平衡特性。此外，通过在输入和输出idt之间连接电感器可以获得更好的性能。采用附加电感和寄生电容并联谐振电路可以很好地解决这一问题。实验结果表明，平衡型声呐滤波器具有良好的性能。这些值满足系统要求。

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An analysis and improvement of balanced-type SAW filters

The degradation mechanism of balance performance for balanced-type SAW filters was analyzed. The authors have confirmed that the parasitic coupling between input and output IDTs makes the balance characteristics degrade. The measurement results show good agreement with simulations by assuming the parasitic capacitances. The balance characteristics can be improved by decreasing the parasitic capacitances. Further, the much better performance can be obtained by connecting inductors between input and output IDTs. Parallel resonance circuit with additional inductor and the parasitic capacitance can solve the problem successfully. The experimental balanced-type SAW filter shows an excellent performance. These values satisfy the system requirements.

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2002 IEEE Ultrasonics Symposium, 2002. Proceedings.

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