基于改进遗传算法的双波带阻抗变换器设计

摘要

阻抗匹配技术在微波工程中十分重要。提出了一种基于改进遗传算法的双频带阻抗匹配的设计方法，该阻抗变换器能在2个频率点对任意电阻性负载实现理想的阻抗匹配。通过对多节传输线匹配方程的严格解，得到了双频阻抗变换器的精确设计公式，对用该方法设计的阻抗变换器性能进行了仿真分析，结果显示了该方法的有效性，可用于实际的设计。%The impedance matching technique is very important in microwave engineering. This paper proposes a dual-band impedance matching design method based on a variant of canonical Genetic Algorithm. The impedance transformer can realize ideal im-pedance matching in two frequency points in any resistive load. Based on the exact solution of multi-section transmission line matching equation, the precise design formula of dual band impedance transformer is obtained. The simulation analysis on impedance transforma-tion performances designed by the method is implemented, and the results show that the proposed method is effective and can be used in practical design.