Co-Aperture Concentric Square Slots-Based Sub-6 GHz and mm-Wave 5G Antenna Design

In this paper, a square concentric slots-based antenna is presented for sub-6 GHz and millimeter wave (mm-wave) bands for Internet of Things (IoT) applications. The proposed antenna design exhibits an octa-band operation for sub-6GHz spectrum while it is resonating at 28 GHz for mm-wave band. The unique features of the proposed design are using the same radiating structure for both sub-6 GHz and mm-wave bands. The antenna consists of a three concentric square slots with ground (GND) plane dimensions of 50×50×0.508 mm
³
. For the sub-6 GHz band, the antenna is excited by a single open-end microstrip transmission-line, while eight transmission lines are used to excite the slots array at mm-wave band. The antenna covers most of 5G bands at sub-6 GHz as well as at mm-wave band at 28 GHz. Thus, the proposed antenna is a potential candidate for 5G enabled IoT applications.