Abstract
Hybridization of Genetic Programming and global low-level optimizer, namely Genetic Algorithm was previously developed. With the aim of improving computational efficiency, conjugate direction search method is modified and proposed as a new low-level optimizer for upper level Genetic Programming. In order to demonstrate computational efficiency, Genetic Programming and two low-level optimizers are employed to design broadband, low frequency ground plane (225 MHz–450 MHz). When applying optimizers on a single processor, preliminary results show that optimized unit cell found by new low level optimizer has a better reflection magnitude (at least 0.8 over the frequency range) than the one found by Genetic Algorithm (as low as 0.25 over the frequency band). Details of proposed method will be presented and discussed in the paper.
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