A Novel Isolation Structure Design for Compact MIMO Antenna System

Abstract

Fragment-type structure has been used to acquire high isolation for compact multiple-input and multiple-output (MIMO) antenna systems. In this paper, through multiobjective optimization, fragment-type isolation structure etched on the front of substrate is designed for a compact MIMO planar inverted-F antennas (PIFAs) systems operating at 3.71-3.79GHz. Compared with other fragment-type isolation structures, both steady main-beam direction and better front-to-back-ratio are observed.