Abstract
A broadband and high isolation MIMO antenna using the theory of characteristic modes (TCM) is proposed in this paper. A ground plate with slots, expanding the operating bandwidth, is printed in the bottom of dielectric substrate. And the feeding structure was located in the top of dielectric structure, which connected with the ground plate by a metal via. After studying performance of the structure by using eigenvalue, characteristic angle (CA), characteristic current and modal significance (MS), we used the feeding structure in the suitable location to achieve the wide operating band. Antenna has an operating band of 4.62 GHz from 2.53 GHz to 7.15 GHz, a relative band of 95.5%. In order to increase the isolation of the MIMO antenna, we have made slits in the ground plate combined two antenna units. It has the good isolation achieved −18 dB in the operating band.
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