四、带通滤波器由本文第二部分可知,SAW带通滤波器设计的主要问题是推导合适的脉冲函数h(t),h(t)通过傅里叶变换与滤波器频率响应H(f)联系起来.通常,h(t)为无限值,所以必须对它截断,带通滤波器的实现.有限脉冲响应函数(其傅里叶变换给所需的“理想”频率响应以最佳近似值)的推导过程曾经是七十年代的主要研究课题.根据研究,几种非常有用的计算机辅助设计程序在目前已普遍采 Bandpass filter As we can see from the second part of this paper, the main problem of SAW bandpass filter design is to derive the appropriate impulse function h (t), h (t) by Fourier transform and filter frequency response H (f In general, h (t) is an infinite number, so it must be truncated, the implementation of the band-pass filter.The finite impulse response function whose Fourier transform gives the desired “ideal” frequency response with the best approximation ) Was a major research topic of the 1970s.According to the research, several very useful computer aided design programs have been widely adopted