复合左右手传输线平衡点的三点快速优化方法  

Three-Point Fast Optimization Algorithm to Balance Composite Right/Left-Handed Transmission Line

作　　者：陈小舟[1] 尹成友[1] 关闯[1] 

机构地区：[1]解放军电子工程学院脉冲功率激光国家重点实验室,合肥230037

出　　处：《微波学报》2010年第6期22-27,41,共7页Journal of Microwaves

基　　金：国家自然科学基金项目(60671057)

摘　　要：提出了一种基于遗传算法的快速优化算法,使复合左右手传输线达到平衡状态且拥有较低的回损值。算法使用商用软件分析出两个级联单元在3个邻近频率点的转移矩阵。利用Bloch方法计算出传输线的衰减系数和相移系数,据此提出一种适应度函数,并利用其进行优化。优化过程中采用自适应变异率和移民策略避免了早熟收敛与随机搜索问题;所分析的模型与原模型相比,减少了传输线单元,且无须大规模扫频,从而提高了优化速度。通过比较发现,该算法有更广阔的适用范围和更好的优化效果。To optimize composite right/left-handed transmission line（CRLH TL） to balanced state and minimize the return loss at balanced frequency,a fast algorithm based on genetic algorithm（GA） is presented.Firstly,the transmission matrix of two cascaded cells at three frequency points is computed by commercial software,then by means of Bloch method,the attenuation and phase constants of the whole CRLH TL are solved,from which a novel fitness function is presented to accomplish the optimization.Adaptive mutation rate and immigration are adopted to avoid the premature convergence and random searching.The procedure is accelerated due to the absence of frequency-sweeping and analysis of the whole TL.Compared to present other ones,this algorithm can be used in a wider range and produce better results.

关 键 词：复合左右手传输线(CRLH) 遗传算法(GA) 漏波天线 超宽带滤波器 

分 类 号：TN811[电子电信—信息与通信工程]