Novel optimization strategies for isolation structure design in MIMO systems

Abstract

Isolation is one of the most important electric characteristics in a compact MIMO (multiple-input and multiple-output) system. Fragment-type structure receives much attention for acquiring high isolation due to its novel topology structure. In this paper, several novel boundary-based weighted sum filtering operators are proposed to obtain fragment-type isolation structure designs. Experiments on the isolation structure design of a compact MIMO PIFAs (planar inverted-F antennas) system are investigated. Comparison results show that the proposed hybrid filtering matrices could generate smoother structure, thus obtain wider impedance bandwidth and better radiation efficiency.