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一、前言在试制晶体滤波器的工作中,由于滤波晶体主谐频率的高端存在一系列寄生谐振峰,它对晶体滤波器的性能造成严重影响。在窄通带晶体滤波器中,若寄生落在阻带内、将使阻带特性遭到显著破坏。在加感拉宽的带通晶体滤波器中,若寄生落在通带内,将使通带出现中断现象,给制造晶体滤波器带来很大麻烦。为了抑制这种不需要的寄生模式,许多晶体滤波器工作者曾作了很多努力,寻找抑制寄生的途径。早期抑制寄生的方法除了稜边倒角
First, the preamble In the work of the trial crystal filter, the filter crystal main harmonic frequency of the existence of a series of parasitic resonance peak, which has a serious impact on the performance of the crystal filter. In narrow passband crystal filters, if the parasitics fall within the stopband, the stopband characteristics are significantly degraded. In the sense of widened band-pass crystal filter, if the parasitic fall in the passband, the passband will appear interrupted, to create a crystal filter a lot of trouble. In order to suppress this unwanted parasitic mode, many crystal filter workers have made a lot of efforts to find ways to suppress parasitism. Early suppression of parasitic methods except edge chamfering