本文介绍了由一多条耦合器和两加权换能器组成,而且长度很小的 SAW 滤波器的改进设计。用 FIR 滤波器逼近所要求的频率响应。用线性规划方法获得平滑的通带。这种频率响应通过零点分离法被分配到两个换能器上。允许具有不对称时间函数,可使两换能器间的响应差极小。最后,提出了对电路和衍射效应补偿的方法。测得设计在 yz—LiNbo_3基片上的带通滤波器的波形系数为1.08。 This article presents an improved design of a SAW filter consisting of more than one coupler and two weighted transducers, and a very small length. The FIR filter is used to approximate the desired frequency response. Obtain a smooth passband using linear programming. This frequency response is distributed to the two transducers by the zero point separation method. Allowing for asymmetric time functions minimizes the difference between the two transducers. Finally, a method of compensating the circuit and diffraction effects is proposed. Measured designed yz-LiNbo_3 substrate on the band-pass filter waveform coefficient of 1.08.