窄孔径声表面波滤波器的衍射计算和校正

本文利用了Ｆｒｅｓｎｅｌ积分的快速算法，对具有抛物线近似的各向异性基片材料计算了叉指换能的衍射频率响应。计算中考虑了收、发叉指换能器之间的距离，声也径比值和抽样频率改变对衍射的影响。由此，可以决定滤波器的最佳设计参数。同时提出了采用校正函数补偿衍射影响的方法。

Diffraction Calculation and Correction of SAW Filters with Narrow Aperture

n this paper,the diffraction frequency response of interdigital transducer(IDT) have been computed for substrates with anisotropic parabolic approximation, usnig Fresnel integration fast numerical methed. The distance between receiving and transmitting transducers.aperture ratio and sample frequency change have been considered in the computation. Hence,the optimal design parameters can be determined. At the same time, the method with corrective function is proposed to compensate the influence of diffraction.