声表面波非线性相位叉指换能器的设计

Design of Interdigital Transducers with Non-linear Phase Response

论述用“积木式”方法,采用均匀条宽和间隔的叉指结构,实现对群时延有特殊要求的声表面波叉指换能器的设计原理和方法.在时域上引入了不同群时延的窄带校正函数.对幅频特性和群时延特性进行精细调整.研究了机辅设计程序.实验表明,该程序对设计各种幅频和相频特性的IDT是行之有效的.

This paper discusses the principle and method of designing SAW IDT with specific group delay response, using a 'buildingblock' approach and homogeneous fingers. Narrow band corrective functions with various group delay are introduced into the time domain. The amplitude and group delay characteristics can be controlled exactly. A CAD program has been developed. and the experiments show that the program is useful for designing IDT with various amplitude and group delay response.