摘要
分析锥型技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。
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.
出处
《应用声学》
CSCD
北大核心
2000年第4期18-21,17,共5页
Journal of Applied Acoustics
关键词
声表面波滤器
锥型换能器
加权
设计
SAW filter, Wide band-low loss tapered transducer, Weighting
