提高级联滤波模块带外抑制的方法

摘要

级联滤波器模块在短波通信中起到至关重要的作用.为了提高带外抑制这一重要指标,通过研究级联网络的带外抑制跟前后级网络反射系数的关系,给出了级联网络失配损耗的公式,分析比较了衰减网络、隔离器等改善带外抑制的手段,进而提出了插入一般性网络以提高带外抑制的可能性,证实了这一方法是高效可行的.%Cascade filter plays an important role in short-wave communication. To improve out-band rejection, through studying the relationship between the out-band rejection and the reflection coefficient, the mismatch loss formula of cascaded network is proposed. The means of using attenuation network and isolator to improve the out-band rejection are analyzed. The possibility of inserting a general network to improve the out-band rejection is proposed, and the method is proved to be efficient and feasible.