A Mimo Antenna Design Challenges for Uwb Application

Abstract—This paper proposes a compact printed ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna with a dimension of 38 × 91 mm2. 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 5.3 dBi between an operating frequency of 2.8GHz and 8.0 GHz under a minimum reflection coefficient of less than −10 dB (S11 < −10 dB). Moreover, the antenna successfully achieved mutual coupling minimization of < −17 dB, eventually resulting in enhancement of radiation efficiency. Besides, the UWBMIMO’s correlation coefficient was effectively reduced to less than −22 dB, which reflected an improvement in the antenna’s diversity. In this paper, the proposed antenna is examined both numerically and experimentally.