中文摘要：

给出了一个新的关于声表面波反射延迟线理论分析方法，基于波动方程和Chen-Haus理论、利用变分方法研究了压电基底上金属短路栅阵中声表面波传输特性，得到其精确反射系数．之后，实验研制了一个用41°YXLiNbO3、单相单向换能器和三个短路反射栅构成的434MHz声表面波反射延迟线，测量值与理论分析基本一致，器件具有尖锐反射峰、高信噪比等特性．

英文摘要：

This paper presents a theoretical analysis and design on surface acoustic wave reflective delay line. Based on the wave equation and Chen-Haus theory, a variational principle is used to investigate surface acoustic waves passing through shorted-circuited gratings on a piezoelectric crystal. The reflection coefficient of the granting is deduced to evaluate the device performance. After obtaining these parameters, a 434 MHz SAW reflective delay line with single phase unidirectional transducers and three shorted grating reflectors is fabricated on 41°YX LiNbO3. The measured reflective coefficients agree well with the simulated one. Sharp reflection peaks, high signal noise ratio（S/N）and low spurious noise between the reflection peaks are observed.