Fragment-Type Structure Designs by Using A Novel Optimization Method

Fragment-type structures are potential for acquiring higher performances in microwave component designs than regular structures. In this paper, a novel boundary-based weighted sum filtering operator is proposed to increase the number of candidates during the optimization of fragment-type structures. As an example, fragment-type isolation structures of a compact MIMO (multiple-input and multiple-output) PIFAs (planar inverted-F antennas) system operating at 2.345GHz-2.36GHz and having a center-to-center interval of 15mm are designed. Comparison results show that more alternative designs could be found at small expense of searching speed.