在采用计算机辅助设计的年代,列线图几乎被人们所遗忘,但是它仍然可以帮助滤波器设计师快速地完成滤波器原型的变换。本文所介绍的列线图,可以帮助带阻和带通滤波器的设计。用电感和电容构成的谐振回路代替低通滤波器的串联电感和并联电容,便可把低通滤波器变换成带通滤波器。在微波频段,电感和电 Almost forgotten in the age of computer-aided design, but it can still help filter designers to quickly complete the transformation of the filter prototype. The nomogram introduced in this article can help design with band-stop and band-pass filters. The low-pass filter can be transformed into a band-pass filter by replacing the series inductance and the shunt capacitance of the low-pass filter with a resonant circuit consisting of an inductor and a capacitor. In the microwave frequency band, inductors and electricity