Sheriff Nathirulla, Kamal Sharul, Tariq Chattha Hassan, Kim Geok Tan, Khawaja Bilal A
Wireless Communication Center, School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia.
Advanced Cyclotron Systems Inc. (ACSI), Richmond, BC V6X 1X5, Canada.
Micromachines (Basel). 2022 Dec 12;13(12):2202. doi: 10.3390/mi13122202.
A compact four-port multi-input, multi-output (MIMO) antenna with good isolation is proposed for sub-6 GHz and Internet of Things (IoT) applications. Four similar L-shaped antennae are placed orthogonally at 7.6 mm distance from the corner of the FR4 substrate. The wideband characteristics and the required frequency band are achieved through the L-shaped structure and with proper placement of the slots on the substrate. To obtain good isolation between the ports, rectangular slots are etched in the bottom layer and are interconnected. The proposed antenna has total dimensions of 40 mm × 40 mm × 1.6 mm. The interconnected ground plane provides good isolation of less than -17 dB between the ports, and the impedance bandwidth obtained by the proposed four-port antenna is about 54% between the frequency range of 3.2 GHz to 5.6 GHz, thus providing a wideband antenna characteristic covering sub-6 GHz 5G bands (from 3.4 to 3.6 GHz and 4.8 to 5 GHz) and the WLAN band (5.2 GHz). The proposed design antenna is fabricated and tested. Good experimental results are achieved when compared with the simulation results. As the proposed design is compact and low profile, this antenna could be a suitable candidate for 5G and IoT devices.
本文提出了一种适用于6GHz以下频段和物联网（IoT）应用的紧凑型四端口多输入多输出（MIMO）天线，该天线具有良好的隔离性能。四个相似的L形天线正交放置在距FR4基板角落7.6mm处。通过L形结构以及在基板上合理设置缝隙来实现宽带特性和所需频段。为了在端口之间获得良好的隔离，在底层蚀刻矩形缝隙并使其相互连接。所提出的天线总尺寸为40mm×40mm×1.6mm。相互连接的接地平面在端口之间提供了小于-17dB的良好隔离，所提出的四端口天线在3.2GHz至5.6GHz频率范围内获得的阻抗带宽约为54%，从而提供了覆盖6GHz以下5G频段（3.4至3.6GHz和4.8至5GHz）以及WLAN频段（5.2GHz）的宽带天线特性。所提出的设计天线已制作并测试。与仿真结果相比，取得了良好的实验结果。由于所提出的设计紧凑且外形低矮，该天线可能是5G和物联网设备的合适候选方案。
