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Boundary‐based optimization strategies for design of fragment‐type isolation structure in compact MIMO systems
Author(s) -
Ding Dawei,
Yang Lixia,
Shi Lijuan,
Li Dawei
Publication year - 2019
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21531
Subject(s) - mimo , boundary (topology) , isolation (microbiology) , fragment (logic) , operator (biology) , bandwidth (computing) , type (biology) , planar , computer science , mathematics , algorithm , mathematical optimization , mathematical analysis , telecommunications , channel (broadcasting) , biochemistry , chemistry , ecology , computer graphics (images) , repressor , transcription factor , gene , microbiology and biotechnology , biology
Fragment‐type structures have been used to acquire high isolation in compact multiple‐input and multiple‐output (MIMO) systems. In this paper, two novel optimization strategies, boundary‐based two‐dimensional (2D) median filtering operator and boundary‐based 2D weighted sum filtering operator, are proposed to design fragment‐type isolation structures first when specific boundary conditions are considered in engineering designs. Second, two computer aided optimization techniques are proposed through combining these two operators with MOEA/D‐GO (multi‐objective evolutionary algorithm based on decomposition combined with enhanced genetic operators), respectively. Finally, fragment‐type isolation structures of a compact MIMO PIFAs (planar inverted‐F antennas) system operating at 2.345‐2.36 GHz are designed. Comparison results show that more alternative designs could be found at the expense of searching speed, and both better front‐back‐ratio and wider impedance bandwidth are observed.