Abstract
In this article, a square concentric slot-based antenna is presented for sub-6-GHz and millimeter-wave (mm-wave) 5G-enabled Internet of Things (IoT) devices. The proposed antenna design exhibits an octaband operation for the sub-6-GHz spectrum while resonates at 28 GHz as well. The unique feature of the proposed design is the shared radiating aperture for both sub-6-GHz as well as mm-wave bands. The antenna consists of three concentric square slots etched out from a ground (GND) plane dimensions of 50 × 50 × 0.508 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> . For the sub-6-GHz band, the antenna is excited by a single open-ended microstrip transmission line, while 1 × 8 power divider (PD) is used to excite the planar connected antenna arrays at the mm-wave band. The proposed antenna covers the following eight bands for sub-6-GHz operation: 1.05-1.23 GHz, 1.4-1.55 GHz, 1.9-2.3 GHz, 2.3-2.7 GHz, 3.1-3.7 GHz, 4.04-4.511 GHz, 4.83-5.2 GHz, and 5.66-6.151 GHz. The mm-wave band covers 27.4-28.4 GHz with the minimum bandwidth (BW) of 1 GHz. The proposed antenna covers most of the IoT bands, thus, it is a potential candidate for next-generation 5G-enabled IoT devices.
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