一种非对称频响声表面波滤波器
By designing an asymmetric frequency response surface acoustic wave filter, employing an input interdigital transducer with non-uniform finger width and finger strip length envelope apodization, and an output interdigital transducer with uniform finger width, combined with a shielding strip structure, the problem of insufficient asymmetric frequency response performance in the prior art is solved. This achieves asymmetry in the frequency response curve and reduction in chip size, thereby improving the mass production yield.
CN115913168BActive Publication Date: 2026-07-17CHENGDU LIAOYUAN XINGGUANG ELECTROICS LLC
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHENGDU LIAOYUAN XINGGUANG ELECTROICS LLC
- Filing Date
- 2022-11-28
- Publication Date
- 2026-07-17
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Figure CN115913168B_ABST
Abstract
本发明公开了一种非对称频响声表面波滤波器，其包括输入叉指换能器、输出叉指换能器，以及设置在输入叉指换能器与输出叉指换能器之间的屏蔽条；屏蔽条与输入叉指换能器的接地端相连；输入叉指换能器的指条为非均匀指宽及指条长度包络变迹且包络倾斜结构；输出叉指换能器的指条为均匀指宽及指条长度包络不变迹空心指结构。本发明实现了频响曲线非对称，与传统的奇偶函数分解积木组合均匀分裂指结构声表面波滤波器芯片结构相比，本发明可优化滤波器插入损耗2～4dB。
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