Embeddable Structure for Reducing Mutual Coupling in Massive MIMO Antennas

Qin, Yue; Li, RongLin; Cui, Yuehui

doi:10.1109/access.2020.3033717

Cited by 20 publications

(10 citation statements)

References 25 publications

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“…In addition, on the basis of ensuring the requirements of the wideband operating band, the array in our work has relatively high total efficiency. The gain of our work is comparable with that in [14] and higher than [16], [17], and [18]. The cross-polarization level in our work is higher than the rest arrays, but it is caused by the inherent defects of the antenna unit itself.…”

Section: Comparisonsupporting

confidence: 55%

“…Furthermore, the isolation of these arrays does not have a prominent increment. In addition, though the decoupling structure proposed in [14] and [18] has a rather wide bandwidth, they have high design and fabrication complexity. The near-field resonator is a novel decoupling concept, but it has a narrow working band, and its isolation can only be enhanced to 20 dB.…”

Section: Comparisonmentioning

confidence: 99%

“…However, the distance between the array elements is around 0.62λ. Reference [18] proposed an embeddable structure for reducing mutual coupling in a 3 × 3 MIMO array, but the worst co-polarized mutual isolation is only 20 dB. Reference [19] proposed a decoupling method of dielectric superstrate.…”

Section: Introductionmentioning

confidence: 99%

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Massive MIMO Array Design With High Isolation by Using Decoupling Cavity

Luo

Pedersen

Zhang

2023

IEEE Trans. Circuits Syst. II

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This letter proposes an isolation enhancement method for massive multiple-input multiple-output arrays using decoupling cavities (DC). The proposed DC is made of a pure Polypropylene (PP) board, and an air cavity is engraved on it. The DC has high transmission in the normal direction and a high insertion loss in the tangential direction of the arrays, respectively. The DC operates with a broadband response due to the low dielectric constant of the substrate. An example of a 4×4 array with an inter-element distance around half wavelength is designed to verify the proposed isolation enhancement method. The triplelayers stacked DC are employed seamlessly above the array. The isolation of the array was enhanced to 24 dB within the bandwidth of 4.21-4.79 GHz. At the same time, the radiation characteristics of the arrays before and after loading the DC basically keep consistent.

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Section: Comparisonsupporting

confidence: 55%

Section: Comparisonmentioning

confidence: 99%

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Massive MIMO Array Design With High Isolation by Using Decoupling Cavity

Luo

Pedersen

Zhang

2023

IEEE Trans. Circuits Syst. II

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“…As a conclusion, higherorder aperiodic arrays have been shown efficient for mitigating inter-user interference by reducing channel correlation. Table I compiles the main contributions and applications from the references [9][10][11][12][13][14][15][16][17][18][19], which also includes the previously discussed papers from the Introduction.…”

Section: Related Workmentioning

confidence: 99%

Antenna Array Diversity Evaluation Under Multipath Environments With Digital Beamforming

Filgueiras

Brandão

Pereira

et al. 2023

IEEE Open J. Antennas Propag.

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This work proposes a methodology for evaluating the antenna array diversity and resultant radiation pattern from digitally-processed-based beamforming systems. Our approach enables to interpret the advanced antenna systems (AAS) coverage and massive multiple-input multiple output (mMIMO) spatial resolution, by the inspection of the array resultant multiple beams. Particularly, the impact on the mMIMO spatial resolution is conducted as a function of the channel correlation, by means of an exclusively radiofrequency (RF) approach, with the advantage of not considering the system-level features, and using a new figure of merit (Λ factor). The new figure of merit enables to evaluate the antenna array diversity from two-and three-dimensional (2D and 3D) beamforming, by computing the number of lobes with gain higher than a unique element. In the 3D case, the figure of merit is based on a differential calculation, which enables performing an infinitesimal counting of lobes per antenna element beamwidth. Such parameter is initially applied to a theoretical dipole-based array, with the purpose of quantifying the created multiple beams by the overlapped radiation patterns from mMIMO systems. Furthermore, the Λ factor is exploited for analyzing the performance of a 64-element and dual-polarized SICL-based slot antenna array and a 64-element dipole-based antenna prototypes, both previously developed by our research group. Finally, it is demonstrated that the Λ factor increases as diversity increases and dipole-based antenna array could be used as an upper limit, attaining 11.46 lobes/rad.INDEX TERMS 5G, AAS, antenna array, digital beamforming, figure of merit, massive MIMO and TDD.

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“…To achieve in-band decoupling (IBD), it is intuitive to insert a band-stop FSS wall between antennas, 16,17 or arrange a single-negative metasurface above antennas. [18][19][20][21] Besides, over-the-air coupling can be canceled out by loading antenna decoupling surface (ADS), 22,23 dielectric superstrate [24][25][26][27][28] or parasitic structures, 29 since they introduce an additional coupling path with equal magnitude and opposite phase.…”

Section: Introductionmentioning

confidence: 99%

Dual‐band stacked base station antenna array with high isolation

Chu

2022

Int J RF Mic Comp-Aid Eng

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A high‐isolation dual‐band base station antenna array is proposed. At first, a 5‐element high‐band (HB) dipole antenna array with inter‐element distance of 0.4 λH0 (the free‐space wavelength at the center frequency of the HB) is decoupled. With the main antenna decoupling surface (ADS), metal baffles and auxiliary ADS, the E‐plane and H‐plane couplings can be reduced to <−23.1 dB (<−11.4 dB without decoupling) and <−22.6 dB (<−14.8 dB without decoupling), respectively. The dual‐layer ADS design successfully resolves the contradiction between decoupling performance and matching. The ground plane of the 5‐element array is then exploited as the low‐band patch radiator, forming the proposed dual‐band antenna array. Measured results show that satisfactory cross‐band isolation (>33.1 dB), in‐band isolation (>22.2 dB) and polarization isolation (>30 dB) are obtained. Stable unidirectional radiation patterns are also acquired.

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Embeddable Structure for Reducing Mutual Coupling in Massive MIMO Antennas

Cited by 20 publications

References 25 publications

Massive MIMO Array Design With High Isolation by Using Decoupling Cavity

Massive MIMO Array Design With High Isolation by Using Decoupling Cavity

Antenna Array Diversity Evaluation Under Multipath Environments With Digital Beamforming

Dual‐band stacked base station antenna array with high isolation

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