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一般的声表面波器件是由与外电路相联接的两个叉指换能器组成，其中所要处理的信号都要经受电 － 声和声 － 电两次转换。又指换能器的结构和外电路的特性对这些转换的效率和相位变化有着密切的联系。本文从声表面波又指换能器交叉场等效电路模型出发，较详细地讨论了声表面波器件中输入、输出又指换能器的设计参数（中心频率和叉指电极对数等）及外电路负载和匹配网络对信号的转换效率和相移（或延迟时间）的影响。本文还针对某些又指换能器的实际例子，给出了详细的计算数据。文中所给出的公式和计算结果，可作为设计声表面波延迟线和振荡器的参考。
The general surface acoustic wave device is composed of two interdigital transducers connected with an external circuit, in which signals to be processed are subjected to two conversions of electro-acoustic and acoustic-electric. Also refers to the structure of the transducer and the characteristics of the external circuit on these conversion efficiency and phase changes are closely linked. In this paper, SAW is also referred to as the equivalent circuit model of the crossover field of the transducer. In this paper, the input and output of the SAW device are discussed in detail. The design parameters of the transducer (the center frequency and the number of pairs of interdigitated electrodes) And external circuit load and matching network on the signal conversion efficiency and phase shift (or delay time) impact. This article also gives some detailed calculation data for some practical examples of transducer. The formulas and calculation results given in this paper can be used as references for designing SAW delay lines and oscillators.