Abstract
A 2-element MIMO antenna is presented for 5G standards covering both the sub-6 GHz and millimeter-wave (mm-wave) bands using the same radiating structure. The antenna consists of a five concentric pentagonal slots. For the sub-6 GHz band, the antenna is excited by a single open-end microstrip transmission-line, while eight transmission-lines, connected through T-junction excites the mm-wave band. Designed on a substrate of of size 120×60 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , the antenna covers 1.4-1.58 GHz, 1.82-2.14 GHz, 2.48-2.9 GHz, 3.1-3.8 GHz, 4-4.5 GHz and 27.8-28.3 GHz. The antenna not only provides backward compatibility with 4G bands, it also covers the sub-6 GHz 5G bands and 28 GHz bands.
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