一种基于差分进化理论优化的隐式空间映射算法及其应用

AN IMPLICIT SPACE MAPPING ALGORITHM OPTIMISED WITH DIFFERENTIAL EVOLUTION THEORY AND ITS APPLICATION

标准隐式空间映射算法在优化滤波器的过程中可能会出现假收敛现象,从而导致模型之间建立的映射关系偏弱,使得整体的优化效率降低。介绍一种改进算法,通过引入差分进化算法(DE)搜索目标函数的全局最优解,避免优化过程出现假收敛。最后应用该算法优化一种多层结构的LTCC微带滤波器。实验结果表明,旨在获取更好映射关系的新算法在同样满足设计指标的条件下,所用迭代次数少,用时也更短,具备良好的可行性和高效性。

False convergence may exists in filte r op tim isa tio n process o f standard im p lic it space m apping a lg o rith m ,it leads to the m appingre la tio n sh ip between coarse-m odel and fin e -m o d e l becom ing w eak and makes the e n tire o p tim isa tio n e ffic ie n c y be low. W e propose an im proveda lg o rith m ,b y in tro d u cin g d iffe re n tia l evo lu tion theory it searches the o p tim al global solutio n o f ob je ctive fu n c tio n ,a n d prevents false convergencein o p tim isa tio n process. A t la s t,w e a p p ly this a lgo rithm to optim ise an LTCC filte r w ith m u lti-le v e l structure. E xperim enta l results dem onstratethat the new m ethod aim ed at achieving be tter m a pping re la tio n sh ip has less ite ra tio n tim es and costs shorter tim e u n der the co n d itio no f satisfying the design specifications s im ila rly . I t has good fe a s ib ility and e fficie n cy.