| 利用锥型换能器的宽带低损耗声表面波滤波器设计 |
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| 引用本文： | 秦廷辉,黄广伦,曹亮,朱勇.利用锥型换能器的宽带低损耗声表面波滤波器设计[J].应用声学,2000,19(4):18-21,17. |
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| 作者姓名： | 秦廷辉 黄广伦 曹亮 朱勇 |
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| 作者单位： | 信息产业部第26研究所重庆 400060 |
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| 摘 要： | 分析锥型换能器的基本原则是把换能器沿孔径方向划分成足够多的通道来进行近似，设计制作的关键是加权技术和数据处理技巧。由于SPUDT的特性，把EWC型的SPUDT引入到锥型换能器对制作宽带、低损耗器件是十分有用的；我们在Y128°LN基片上采用一般型和SPUDT型锥型换能器制作了相对带宽约15%的声表面波滤波器，一个换能器采用“块加权”，另一个换能器采用抽指加权。文中给出了两种器件的实验结果，SPUDT型声表面波滤波器的插损仅7.5dB。
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| 关 键 词： | 声表面波滤器 锥型换能器 加权 设计 |
Design of wide-band low-loss SAW filter using tapered transducer |
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| Qin Tinghui,Huang Guanglun,Cao Liang and Zhu Yong.Design of wide-band low-loss SAW filter using tapered transducer[J].Applied Acoustics,2000,19(4):18-21,17. |
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| Authors: | Qin Tinghui Huang Guanglun Cao Liang and Zhu Yong |
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| Institution: | Sichuan Institute of Piezoelectric and Acoustic Technology, ChongQing 400060;Sichuan Institute of Piezoelectric and Acoustic Technology, ChongQing 400060;Sichuan Institute of Piezoelectric and Acoustic Technology, ChongQing 400060;Sichuan Institute of Piezoelectric and Acoustic Technology, ChongQing 400060 |
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| Abstract: | The method for analyzing tapered transducer to divide the transducers into a large number of channels parallel to the propagation direction of the SAW.The key of design is the technology of weighting and photo masking and that of data processing.Because of SPUDT's characteristic. It is very useful to design wide-band low loss SAWF using tapered EWC- SPUDT transducer; Two kinds of SAWF using respectively usual and SPUDT tapered transducers with 15% fractional bandwidth are designed on Y128 'LN.One transducer is block weighted, and the other one withdrawal- weighted. The experimental results are presented in this paper, The loss of SAWF using tapered SPUDT transducer is only 7.5dB. |
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| Keywords: | SAW filter Wide band-low loss tapered transducer Weighting |
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