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In this paper, a simple and compact tri-band multiple-input-multiple-output (MIMO) antenna for wireless applications is proposed. The antenna is composed of two symmetric monopoles placed a distance of 0.106λ0 and occupies 0.26λ0 × 0.25λ0 board area. The tri-arm monopole offers operation over 2.1–2.7 GHz, 3.3–3.7 GHz and 4.9–5.35 GHz with percentage impedance bandwidth of 25%, 11.4% and 8.7%, respectively. An isolation greater than 20 dB is achieved by integrating a stub in the ground plane and adding a stub in the feed line. The structure exhibits stable gain and radiation patterns. Various performance metrics including envelope correlation coefficient (ECC), diversity gain (DG) and mean effective gain (MEG) are measured.

A SIMPLE TRI-BAND MIMO ANTENNA USING A SINGLE GROUND STUB