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Wideband MIMO Antenna System Employing Slot and Via Loading Technique for 5G Terminals
Xin-Hao Ding1, Liang-Jun Zhan1, Zhen Tan1
1School of Information Science and Technology, Nantong University, Nantong 226019, China.
Abstract:
This work introduces a wideband four-element multiple-input multiple-output (MIMO) antenna system with four rectangular patches arranged in a sequentially rotated configuration. Wideband frequency operation is realized by exploiting the TM10, TM01 and TM11δ modes through the utilization of a slot and metallized vias in the patch design. Another group of metallized vias are used to control coupling between the antenna elements, achieving an isolation level of over 17 dB. A prototype is fabricated and measured, demonstrating -6 dB impedance bandwidth ranging from 4.23 GHz to 5.96 GHz, enabling coverage of the N79 (4.4-5 GHz), V2X (5.905-5.925 GHz) and Wi-Fi 5/6 (5.150-5.850 GHz) frequency bands. The MIMO antenna features an efficiency of over 45% and a low envelope correlation coefficient (ECC) lower than 0.25. Owing to its broad bandwidth, compact geometry, and good isolation, the proposed MIMO antenna provides an efficient and practical solution for 5G MIMO applications integrated within mobile terminal back covers.
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