Self-Decoupled MIMO Antenna Pair With Shared Radiator for 5G Smartphones

In this article, a novel self-decoupled multiple-input multiple-output (MIMO) antenna pair with a shared radiator is proposed for fifth-generation (5G) smartphones. In our approach, a radiator is directly excited by two feeding ports, and interestingly, the two ports are naturally isolated across a...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation Vol. 68; no. 5; pp. 3423 - 3432
Main Authors: Sun, Libin, Li, Yue, Zhang, Zhijun, Wang, Hanyang
Format: Journal Article
Language:English
Published: New York IEEE 01.05.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
5G mobile communication
Antenna measurements
Antenna pair
Antenna radiation patterns
Antennas
Bandwidths
Broadband antennas
Decoupling
fifth-generation (5G)
Impedance
MIMO (control systems)
MIMO communication
mode-cancellation method (MCM)
multiple-input multiple-output (MIMO)
Ports
Radiators
self-decoupled
Smart phones
smartphone antenna
Smartphones
ISSN:0018-926X, 1558-2221
Online Access:Get full text
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Summary:In this article, a novel self-decoupled multiple-input multiple-output (MIMO) antenna pair with a shared radiator is proposed for fifth-generation (5G) smartphones. In our approach, a radiator is directly excited by two feeding ports, and interestingly, the two ports are naturally isolated across a wide bandwidth without using any extra decoupling structures. To offer a deep physical insight of the self-decoupling mechanism, a mode-cancellation method based on the synthesis of common and differential modes is developed for the first time. The proposed self-decoupled antenna pair shows a good isolation of better than 11.5 dB across the 5G N77 band (3.3-4.2 GHz) with a radiation pattern diversity property. Based on the self-decoupled antenna pair, an <inline-formula> <tex-math notation="LaTeX">8 \times 8 </tex-math></inline-formula> MIMO antenna system, constituted by four sets of antenna pairs, is simulated, fabricated, and measured to validate the concept. The experimental results demonstrate that the proposed <inline-formula> <tex-math notation="LaTeX">8 \times 8 </tex-math></inline-formula> MIMO system can offer an isolation of better than 10.5 dB between all ports and a high total efficiency of 63.1%-85.1% across 3.3-4.2 GHz. With the advantages of self-decoupling, shared radiator, simple structure, wide bandwidth, and high efficiency, the proposed design scheme exhibits promising potential for the future highly integrated MIMO antennas for 5G smartphones.
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ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2019.2963664