Design of high-diversity gain MIMO antenna arrays through surface current optimization

With the development of 5G, Internet of Things, and smart home technologies, miniaturized and compact multi-antenna systems and multiple-input multiple-output (MIMO) antenna arrays have attracted increasing attention. Reducing the coupling between antenna elements is essential to improving the performance of such MIMO antenna system. In this work, we proposed a graphene-assembled, as an alternative material rather than metal, film-based MIMO antenna array with high isolation for 5G application. The isolation of the antenna element is improved by a graphene assembly film (GAF) frequency selective surface and isolation strip. It is shown that the GAF antenna element operated at 3.5 GHz has the realized gain of 2.87 dBi. The addition of the decoupling structure improves the isolation of the MIMO antenna array to more than 10 dB and corrects the antenna radiation pattern and operating frequency. The isolation between antenna elements with an interval of 0.4λ is above 25 dB. All experimental results show that the GAF antenna and decoupling structure are efficient devices for 5G mobile communication.

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A Novel Calculation-based Parasitic Decoupling Technique for Increasing Isolation in Multiple-element MIMO Antenna Arrays

IEEE Transactions on Vehicular Technology ◽

10.1109/tvt.2020.3045231 ◽

2020 ◽

pp. 1-1

Author(s):

Min Li ◽

S.W. Cheung

Keyword(s):

Antenna Arrays ◽

Mimo Antenna

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A printed multiband MIMO antenna with decoupling element

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078719000096 ◽

2019 ◽

Vol 11 (4) ◽

pp. 413-419 ◽

Cited By ~ 1

Author(s):

Ziyu Xu ◽

Qisheng Zhang ◽

Linyan Guo

Keyword(s):

Mutual Coupling ◽

Surface Current ◽

Antenna System ◽

Antenna Element ◽

Coupling Mechanism ◽

Mimo Antenna ◽

Resonant Modes ◽

Monopole Antennas ◽

Input Multiple Output ◽

Ground Plate

AbstractA printed multiband Multi-Input Multiple-Output (MIMO) antenna is proposed in this paper. This MIMO antenna system comprises two symmetric printed monopole antennas. Each antenna element consists of multiple bend lines, producing four resonant modes and covering the GSM900, PCS, LTE2300, and 5G bands. Simulated and measured results prove that the proposed MIMO antenna can be applied to traditional 2G, 3G, 4G, and present 5G mobile communication. By etching four inverted L-shaped grooves on its ground plate, mutual coupling between the adjacent antenna elements has been suppressed. This makes the |S21| at all four resonant modes is lower than −40 dB. In addition, its low coupling mechanism has been analyzed by surface current distribution. The designed multiband MIMO antenna provides an idea of reference to realize low mutual coupling between antenna elements, which is also realizable in infrared or optical regimes with appropriate designs.

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