一、引言一个横向的声表面波滤波器(SAWF)的频率响应可以通过它的脉冲响应的付氏逆变换来求得。通过控制滤波器的叉指换能器(IDT)的指条位置和重叠长度即可控制IDT的脉冲响应,从而控制IDT的频率响应。关于对称频响的SAWF的设计,已有许多文献作了详细的报道。对于象电视中频SAWF这样既非偶对称,亦非奇对称的频响,其脉冲响应是一个复数, I. INTRODUCTION The frequency response of a transverse SAW filter (SAWF) can be found by the inverse Fourier transform of its impulse response. The frequency response of the IDT can be controlled by controlling the IDT impulse response by controlling the finger position and overlap length of the IDT of the filter. The design of SAWF with symmetrical frequency response has been reported in detail in many literatures. For such as television frequency SAWF this is not even symmetry, nor odd-symmetric frequency response, the impulse response is a complex number,