一、引言随着无线电通信的飞速发展,石英晶体滤波器的应用范围越来越广,不仅要求滤波器失真小,有较高的稳定性和防卫能力,而且对其相位特性也提出了较苛刻的要求,这就使得设计制造者必须从幅频、相频特性两个方面考虑问题。遵照毛主席“抓革命、促生产、促工作、促战备”的指示,我们边学习,边实践,群策群力,克服重重困难,第一次初步试制成功稳 I. INTRODUCTION With the rapid development of radio communication, the application scope of quartz crystal filter is more and more widely. It not only requires less distortion of filter, higher stability and defense ability, but also poses more harshness to phase characteristics This makes the design and manufacture must consider the two aspects of amplitude-frequency and phase-frequency characteristics. Following the instructions given by Chairman Mao for grasping the revolution, promoting production, promoting work, and preparing for war preparations, we learned from our experience while working together to overcome difficulties, and the first preliminary trial was successfully established