Compact Wideband MIMO Diversity Antenna for Mobile Applications Using Multi-Layered Structure

Electronics

Nazar Ali¹  PeterS. Excell²  Omer Arabi²  Atta Ullah³  Raed Abd-Alhameed³  NeilJ. McEwan³  Bo Liu⁴  ChanHwang See⁵ 

[1] Department of Electrical and Electronics Engineering, Khalifa University, Abu Dhabi P.O. Box 573, UAE;Faculty of Arts, Science and Technology, Glyndwr University, Wrexham LL11 2AW, UK;Faculty of Engineering & Informatics, University of Bradford, Bradford BD7 1DP, UK;James Watt School of Engineering, University of Glasgow, Glasgow G12 8QQ, Scotland, UK;School of Engineering and the Built Environment, Edinburgh Napier University, Edinburgh EH10 5DT, Scotland, UK;

关键词: multiple-input multiple-output (MIMO);    mutual coupling;    polarization diversity;    Nelder–Mead method (NM);    surrogate-assisted differential evolution algorithm (SADEA);   

DOI  :  10.3390/electronics9081307

来源: DOAJ

【 摘 要 】

A closely packed wideband multiple-input multiple-output (MIMO)/diversity antenna (of two ports) with a small size of less than 18.5 mm by 18.5 mm is proposed for mobile communication applications. The antenna can be orthogonally configured for corner installation or by placing it on a back-to-back structure for compact modules. To enhance the isolation and widen the bandwidth, the antenna is structured with multiple layers having differing dielectric constants. The feeding through a via significantly reduces the ground waves. A multi-fidelity surrogate model-assisted design exploration method is employed to obtain the optimized antenna geometric parameters efficiently. The antenna design was investigated using electromagnetic simulation and a physical realization of the optimal design was then created and subjected to a range of tests. The specific parameters investigated included reflection coefficients, mutual coupling between the input ports, radiation patterns, efficiency and parameters specific to MIMO behavior: envelope correlation coefficient and pattern diversity multiplexing coefficient. It was found that the antenna has an impedance bandwidth of approximately 4 GHz, mutual coupling between input ports of better than −18 dB and an envelope correlation coefficient of less than 0.002 across the operating band. This makes it a good candidate design for many mobile MIMO applications.

【 授权许可】

Unknown