非均匀宽带阻抗变换器优化设计

当对阻抗变换器总长度有一定限制时 ,传统的均匀宽带阻抗变换器中的特性阻抗可能超出实际能实现的范围 ;对于非均匀宽带阻抗变换器 ,由于取消了对每段传输线长度的限制 ,设计时有了更大的自由度 ;为了得到最佳的传输线网络参数 ,采用了混合遗传算法进行优化设计 ,引入了动态惩罚函数对适应度函数进行处理 ;数值仿真表明 :用该方法设计的宽带匹配变换器的性能优于现有的其它设计方法

Optimized Design of the Noncommensurate Broadband Matching Networks

When there is a certain restriction to the total length of impedance transformer, the characteristic impedance of conventional commensurate broadband matching networks would exceed feasible range. For nonuniform broadband impedance transformers, the design has greater flexibility because the constraint that all elements have the same electrical length is removed. In order to obtain optimal parameters of the transmission line networks, improved genetic algorithm has been adopted to optimize design, and dynamic penalty function is introduced to deal with the fitness function. The simulation result shows that impedance transformers designed by this method have better performance than those designed by conventional methods in most cases.