【摘要】 叉指换能器精确的频率响应是由它的表面电荷分布所决定的，所以．计算换能器的表面电荷受到越来越多的关注。文章推导了二维格林函数的表达式，使用二维格林函数计算了叉指换能器的静态电荷分布，最后指出为什么在表面波设计中对于切趾加权换能器的理论设计总与实验有差别，需要辅以大量的实验来修正指条的加权系数的原因。更多还原

【Abstract】 The accurate frequency response of interdigital transducer is determined by itscharge distribution.So the calculation of the charge distribution is being highly focused.In thispaper, first we derive the general two-dimensional Green Function.Then we calculate the chargedistribution for a simple structure of interdigital transducer.At last we explain why there are always differences between theoretical and experimental results of a opodised IDT, and why lots ofexperiments are needed to modify the weighting factor of the finger.更多还原