基于ADS的微带线阶梯阻抗低通滤波器设计

Design of Low Pass Filter Using Step-Impedance Microstrip Line Based on ADS

滤波器在通信系统中可以让所需信号顺利通过,从而有效滤除不需要的频率信号。利用微带线高阻抗线近似等效于一串联电感,低阻抗线近似等效于一并联电容,把相应的高阻抗线和低阻抗线相互级联起来,这就构成了微带低通滤波器,其具有结构简单,容易加工等优点。文章进行了理论计算,并用ADS进行了优化仿真,仿真结果显示其具有良好的频带响应特性。

In the communication system,the filter can make the required signal pass smoothly,so that the unnecessary frequency signal can be filtered effectively.The high impedance line of microstrip line is approximately equivalent to a series inductance and the low impedance line is approximately equivalent to a parallel capacitor.The corresponding high impedance line and the low impedance line are cascaded alternately.This constitutes a microstrip low-pass filter,which has the advantages of simple structure and easy processing.In this paper,theoretical calculation is carried out,and optimization simulation is carried out with ADS.The simulation results show that it has good frequency band response characteristics.