Wideband Decoupled 8-Element MIMO Antenna for 5G Mobile Terminal Applications

Hei, Yongqiang; He, Jiageng; Li, Wentao

doi:10.1109/lawp.2021.3086261

Cited by 75 publications

(64 citation statements)

References 23 publications

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“…In recent years, various types of MIMO antennas for 5G smartphones have been reported [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ], which fully demonstrate their superiority in the channel capacity, transmission rate, and throughput. Some of these reported can cover a single-frequency narrowband band (about 200 MHz) in the Sub-6 GHz spectrum [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

“…Some of these reported can cover a single-frequency narrowband band (about 200 MHz) in the Sub-6 GHz spectrum [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. The other designs have shifted to the dual-band, tri-band, wideband, and ultra-wideband to improve throughput [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ]. These MIMO antenna systems in smartphones with metal frames have been proposed among [ 14 , 17 , 25 , 30 , 34 , 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

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Miniaturized MIMO Antenna Array with High Isolation for 5G Metal-Frame Smartphone Application

Gao

Wang

et al. 2022

Micromachines

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In this paper, a highly isolated multiple-input multiple-output (MIMO) antenna array is proposed for fifth-generation (5G) metal frame smartphones. The eight identical small-sized inverted F-shaped folded slots are etched on the metal frame as a MIMO antenna. The bandwidth of the antenna can be adjusted by changing one of the short branches of the antenna. The bandwidth of the antenna can reach the N79 band (4.4~5.0 GHz). By carefully arranging the positions of the eight antenna elements, ideal spatial diversity can be successfully achieved to mitigate the coupling between the antenna elements effectively. What is more, a small combination slot of C-shape (0.0078 × 0.047λ2) and vertical I-shape (0.12 × 0.004λ2) between each antenna element is introduced to improve the element isolation of the MIMO antenna system. The proposed MIMO array has been simulated, fabricated, and measured. The results show good impedance matching (return loss > 6 dB) and high isolation (>22 dB). Due to the decent element isolation, the envelope correlation coefficient (ECC) between each antenna element is below 0.049. It can provide a reliable anti-interference performance for the MIMO antenna system. In addition, the measured radiation efficiencies of the MIMO antenna system are higher than 50%. The interaction of the hand model with the MIMO antenna system is also investigated, including the specific absorption rate (SAR).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Miniaturized MIMO Antenna Array with High Isolation for 5G Metal-Frame Smartphone Application

Gao

Wang

et al. 2022

Micromachines

View full text Add to dashboard Cite

show abstract

“…For this reason, large-scale sub-6 GHz mMIMO antennas are now increasingly adopted in 5G terminal devices. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Antenna design for handheld terminal devices is especially complicated and challenging compared to those operating in free-space conditions for other 5G systems, for example, base stations. The reason behind this fact is that the terminal antennas operate under the worst implementation circumstances and the harsh requirements, for example, size limitation, placement restrictions, hand effects, user scenarios, and ease of installation.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4] However, increasing the mutual distance among the antennas requires more volume. By introducing additional decoupling structures, [5][6][7][8][9] decoupling networks, 10,11 and neutralization lines, 12 the antenna spacing can be significantly reduced. Nevertheless, the accompanying disadvantages are the increased footprint and complex tuning mechanism, which are unattractive in practical scenarios.…”

Section: Introductionmentioning

confidence: 99%

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Colocated MIMO antenna pair based on modal orthogonality for 5G terminal applications

Zahid

2022

Micro & Optical Tech Letters

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In this letter, a novel colocated 2 × 2 multiple‐input multiple‐output (MIMO) antenna pair has been proposed. The pair consists of a monopole antenna (J‐source) and a slot antenna (M‐source) integrated at the same location on the terminal ground plane. The inherent orthogonality between the electric source (J) and magnetic source (M) has been exploited to isolate the antenna elements from each other without deploying any additional decoupling component. The proposed 2 × 2 MIMO antenna pair is extended to an 8 × 8 MIMO antenna design for terminal applications. The measured peak isolation between the antenna elements is 25 dB and the impedance bandwidth of the antennas is above 200 MHz with a 3 dBi peak gain, and the envelope correlation coefficient is less than 0.1. The design is proposed for 5G applications operating at the 3.5 GHz band and is a strong candidate for modern smartphone applications.

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Integrated dual‐band multiple‐input multiple‐output antenna module using higher mode control for 5G applications

Piao²

2022

Int J RF Mic Comp-Aid Eng

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This study presents a self-decoupled and highly integrated multiple-input multiple-output (MIMO) antenna pair for the 3.5 GHz (3.4-3.6 GHz) and 5 GHz (4.8-5 GHz) frequency bands, where a loop-type antenna and a dipoletype antenna are assembled into the front and backside of a compact modular board. A tuning inductor and a tuning capacitor are employed in the loop-type antenna and the dipole-type antenna, respectively, for higher mode resonance control, such that the dominant mode and higher mode of each antenna element are excited to achieve dual-band operation. Herein, the dominant modes of the loop-type antenna and the dipole-type antenna are orthogonal to each other, contributing to the self-decoupling effect in the lower band. Otherwise, the modal orthogonality of the higher modes of the two antennas is responsible for the high-isolated performance of the higher band. In this way, the proposed dual-band MIMO antenna module obtains a high spatial utilization ratio, even though they are disposed of in the same volume. The MIMO antenna module can produce impedance bandwidths above 200 MHz at both frequency bands, and the isolation within the lower and higher bands is above 16.5 and 13.5 dB, respectively. Additionally, an 8 Â 8 MIMO antenna array is further constructed and measured. In measurement, the total efficiencies are higher than 60%, and the envelope correlation coefficient values are all below 0.1. Therefore, it is demonstrated that the proposed technique can be promisingly applied in large-scale MIMO antenna systems for current and future terminal devices, having advantages in multiband operation, high integration, and inherent isolation.

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Wideband Decoupled 8-Element MIMO Antenna for 5G Mobile Terminal Applications

Cited by 75 publications

References 23 publications

Miniaturized MIMO Antenna Array with High Isolation for 5G Metal-Frame Smartphone Application

Miniaturized MIMO Antenna Array with High Isolation for 5G Metal-Frame Smartphone Application

Colocated MIMO antenna pair based on modal orthogonality for 5G terminal applications

Integrated dual‐band multiple‐input multiple‐output antenna module using higher mode control for 5G applications

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