Design technique for nonlinear phase SAW filters using slanted finger interdigital transducers
Design technique for nonlinear phase SAW filters using slanted finger interdigital transducers
复制标题
使用斜指叉指换能器的非线性相位SAW滤波器的设计技术
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
H. Yatsuda
中科院分区：
文献类型：
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作者：
H. Yatsuda
介绍了一种适用于中频级宽带滤波器的斜指叉指换能器(SFIT)或锥形叉指换能器(SFIT)实现非线性相位SAW滤波器的设计方法。通过沿垂直于声表面波传播轴的轴改变输入和输出SFIT之间的中心到中心的距离，可以获得通带中所需的非线性相位响应。该设计基于频域中的积木式方法。本文介绍了一种中心频率为70 MHz，分数带宽约为10%的非线性相位声表面波滤波器，它已在x-Cut 112.2/spl deg/y-spao/sub3/上实现。由于基板的功率流角为1.55度，因此SFIT图案沿该角度倾斜。理论结果与实验结果吻合较好。
This paper describes a useful design technique to achieve a nonlinear phase SAW filter using slanted finger interdigital transducers (SFITs) or tapered interdigital transducers which are suitable for wide-band filters in intermediate frequency stages. A required nonlinear phase response in the passband can be obtained by changing center-to-center distances between input and output SFITs along an axis perpendicular to the SAW propagation axis. The design is based on a building-block approach in the frequency domain. A nonlinear phase SAW filter with a center frequency of 70 MHz and a fractional bandwidth of about 10% is demonstrated on x-cut 112.2/spl deg/ y-propagating LiTaO/sub 3/. Because the substrate has a power flow angle of 1.55 degrees, the SFIT pattern is tilted along that angle. Good agreement between theoretical and experimental results is obtained.