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非等波纹低通滤波器具有较好的过渡带特性。它的衰减零极点很容易确定。本文提出利用输入阻抗及其导数进行综合的方法。这一方法不必运用零点移位技术，因而综合过程比较简单。
Unequal ripple low-pass filter has good transition band characteristics. Its attenuation pole is easy to determine. In this paper, a method of synthesizing using input impedance and its derivative is proposed. This method does not need to use the zero point shift technology, so the synthesis process is relatively simple.