A mimo antenna design challenges for UWB application

This paper proposes a compact printed ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna with a dimension of 38 £ 91mm 2 . The presented UWB-MIMO antenna comprises two identical patch elements with D separation distance on the same substrate. The basic single antenna structure has a novel design comprising seven circles surrounding a center circle with partial ground plane implementation. Furthermore, the experimental antenna has peak gain of 5.3dBi between an operating frequency of 2.8GHz and 8.0GHz under a minimum re∞ection coe-cient of less than i10dB (S11 < i10dB). Moreover, the antenna successfully achieved mutual coupling minimization of < i17dB, eventually resulting in enhancement of radiation e-ciency. Besides, the UWB- MIMO's correlation coe-cient was efiectively reduced to less than i22dB, which re∞ected an improvement in the antenna's diversity. In this paper, the proposed antenna is examined both numerically and experimentally.

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