A Compact Band-Notched UWB Antenna Optimized by a Novel Self-Adaptive Differential Evolution Algorithm

Abstract

In this paper, a compact ultra-wideband (UWB) antenna with a WLAN band-notched characteristic is presented. The design technique is based on a novel self-adaptive Differential Evolution (DE) algorithm namely ISADE (improved self-adaptive Differential Evolution algorithm). In order to evaluate the algorithm's performance, we tested it on nine most commonly used benchmark functions. Experimental results have shown that the proposed algorithm outperforms the classical DE and at least is comparable to some other adaptive DE algorithms. The optimized UWB antenna has a compact size of 14 mm × 30 mm and is fabricated and measured. Measured results have shown that the antenna has approximately omnidirectional radiation patterns with a good band-notched performance in the WLAN band. Therefore, the results indicate the advantages of this approach and the applicability of the proposed algorithm to other optimization problems in electromagnetics.