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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Design techniques for SAW filters using slanted finger interdigital transducers
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Design techniques for SAW filters using slanted finger interdigital transducers

机译：使用倾斜手指叉指换能器的SAW滤波器的设计技术

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摘要

This paper describes useful design techniques for wide-band linear phase SAW filters using slanted finger interdigital transducers (SFITs): to increase stop band attenuation, to flatten the pass band response, and to draw SFIT patterns for photo-masks. In order to increase stop band attenuation, a withdrawal-weighted SFIT is employed. A combination of a withdrawal-weighted SFIT and an unweighted SFIT provides good stop band responses, even though the number of finger pairs is small. In order to achieve a desired amplitude response in the pass band, an aperture-weighting technique for divided channels of SFITs is presented. A design method for drawing SFIT patterns for photo-masks is also described. A linear-phase SAW filter using SFITs with a 50% fractional bandwidth is designed and fabricated on 128/spl deg/ y-x LiNbO/sub 3/. A sidelobe suppression of 40 dB and a 3 dB to 40 dB shape factor of 1.12 were realized. Good agreement between theoretical and experimental results is obtained.
机译：本文介绍了用于使用倾斜手指叉指换能器（SFIT）的宽带线性相位SAW滤波器的有用设计技术：增加阻带衰减，展平通带响应以及绘制光掩模的SFIT模式。为了增加阻带衰减，采用撤回加权的SFIT。即使手指对的数量很小，撤回加权SFIT和未加权SFIT的组合也可以提供良好的阻带响应。为了在通带中获得期望的幅度响应，提出了用于SFIT的划分通道的孔径加权技术。还描述了用于绘制用于光掩模的SFIT图案的设计方法。设计和制造使用分数带宽为50％的SFIT的线性相位SAW滤波器，并在128 / spl deg / y-x LiNbO / sub 3 /上制造。实现了40 dB的旁瓣抑制和1.12的3 dB至40 dB形状因数。理论和实验结果之间取得了良好的一致性。

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