An analysis and improvement of balanced-type SAW filters

被引：5

作者：

Nakamura, H ^{[1
]}

Tsuzuki, S ^{[1
]}

Yamada, T ^{[1
]}

Ishizaki, T ^{[1
]}

机构：

[1] Matsushita Elect Ind Co Ltd, Kadoma, Osaka 5718501, Japan

来源：

2002 IEEE ULTRASONICS SYMPOSIUM PROCEEDINGS, VOLS 1 AND 2 | 2002年

关键词：

D O I：

10.1109/ULTSYM.2002.1193376

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

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.

引用

页码：163 / 166

页数：4