Wideband MIMO Antenna Systems Based on Coupled-Loop Antenna for 5G N77/N78/N79 Applications in Mobile Terminals

Zhao, Anping; Ren, Zhouyou

doi:10.1109/access.2019.2913466

Cited by 101 publications

(89 citation statements)

References 29 publications

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“…As seen, the design has less than − 20 dB TARC values at different frequencies. The fundamental properties of the proposed MIMO diversity antenna system are compared with the recently reported MIMO antenna designs and are listed in Table 3 [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. As clearly seen, in contrast to the recently proposed designs, the designed MIMO antenna offers ultra- Another important function is the channel capacity loss (CCL) of the MIMO system [43], which mainly depends on the S-parameters of the MIMO system with the accepted limit of ≤0.4 bps/Hz and can be calculated while using the below formulas:…”

Section: The Proposed Uwb Diversity Antenna Systemmentioning

confidence: 99%

“…Several MIMO 5G smartphone antennas have been recently proposed [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. However, these smartphone antennas either suffer from narrow impedance-bandwidth (either single-band or dual/multi-band) or use single-polarized uniplanar antenna resonators occupying large spaces of the mainboard, which leads to increasing the complexity of the mobile phone system.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the proposed smartphone antenna array in [35] with wide impedance bandwidth employing only two radiators, which is not sufficient for 5G MIMO operation. Moreover, broadband MIMO arrays with 2 GHz bandwidths are reported in [36,37]. The employed radiators are not planar and careful consideration is required in the fabrication process.…”

Section: Introductionmentioning

confidence: 99%

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Ultra-Wideband Diversity MIMO Antenna System for Future Mobile Handsets

Parchin

Basherlou

Al‐Yasir

et al. 2020

Sensors

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A new ultra-wideband (UWB) multiple-input/multiple-output (MIMO) antenna system is proposed for future smartphones. The structure of the design comprises four identical pairs of compact microstrip-fed slot antennas with polarization diversity function that are placed symmetrically at different edge corners of the smartphone mainboard. Each antenna pair consists of an open-ended circular-ring slot radiator fed by two independently semi-arc-shaped microstrip-feeding lines exhibiting the polarization diversity characteristic. Therefore, in total, the proposed smartphone antenna design contains four horizontally-polarized and four vertically-polarized elements. The characteristics of the single-element dual-polarized UWB antenna and the proposed UWB-MIMO smartphone antenna are examined while using both experimental and simulated results. An impedance bandwidth of 2.5–10.2 GHz with 121% fractional bandwidth (FBW) is achieved for each element. However, for S11 ≤ −6 dB, this value is more than 130% (2.2–11 GHz). The proposed UWB-MIMO smartphone antenna system offers good isolation, dual-polarized function, full radiation coverage, and sufficient efficiency. Besides, the calculated diversity performances of the design in terms of the envelope correlation coefficient (ECC) and total active reflection coefficient (TARC) are very low over the entire operating band.

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Section: The Proposed Uwb Diversity Antenna Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ultra-Wideband Diversity MIMO Antenna System for Future Mobile Handsets

Parchin

Basherlou

Al‐Yasir

et al. 2020

Sensors

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show abstract

“…In this study, a self-decoupled MIMO antenna set [31] is accomplished by merely integrating a popularly used loop antenna [32][33][34] with a conventional ground-radiation antenna. It is revealed that the loop is equivalent to an array of two parallel electric-current sources, and the groundradiation antenna is equivalent to a magnetic-current source; this orthogonality contributes to the high isolation property with no need for any additional structural support or tuning efforts.…”

Section: Introductionmentioning

confidence: 99%

A Compact and Straightforward Self-Decoupled MIMO Antenna System for 5G Applications

Piao

Jin

2020

IEEE Access

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This study investigates a compact and straightforward self-decoupled 2 × 2 multiple-input multiple-output (MIMO) antenna set and its applications for current and future 5G terminal devices. The proposed self-decoupled MIMO antennas include a popularly used loop antenna and a compact loop-type ground-radiation antenna without utilizing any supplementary decoupling structures or undergoing complex tuning process. It is revealed that the loop antenna and the ground-radiation antenna can be modeled as an electric-current element and a magnetic-current element, respectively. This orthogonality allows the selfdecoupled characteristic of the proposed MIMO antennas even though the antenna elements are tightly arranged and collocated together. An 8 × 8 MIMO antenna system is further demonstrated for 5G MIMO applications, where both simulation and measurement are conducted to validate the feasibility of the proposed technique. It is concluded that the proposed MIMO antenna system is a smart way to generate high isolation and low correlation characteristics while having advantages of low profile and easy fabrication so that it can be recognized as a promising candidate for 5G applications. INDEX TERMS Multiple-input multiple-output (MIMO), 5G, terminal devices, loop antenna, groundradiation antenna, orthogonality.

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“…However, the frequency bands are independently separated. In [10], an 8-unit broadband MIMO antenna system was proposed, and there were three coupling parts in the antenna. Regulating the length of the coupling part, the loop antenna can work at 0.5λ, 0.75λ, 1.5λ, and finally cover 3.3-5.0 GHz.…”

Section: Introductionmentioning

confidence: 99%

An Improved Loop Ultra-Wideband Mimo Antenna System for 5g Mobile Terminals

Yu¹,

Wang²,

Xie³

2020

PIER Letters

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An eight-element ultra-wideband multiple-input multiple-output antenna system is proposed for the 5G mobile terminals. Each radiating branch is composed of a Loop and a monopole antenna. The ultra-wideband characteristics of the antenna are obtained by a T-shaped feed branch coupling a radiation branch. Furthermore, the isolation is lower than −15 dB by introducing a Tshaped neutralization line structure. The results of simulation and measurement show that the antenna system can cover 3.3-5.6 GHz, and the antenna efficiency is 45%-80%. At the same time, the envelope correlation coefficient between any two elements is lower than 0.03. Therefore, the proposed antenna in this study is very suitable for the eight-element MIMO antenna system as a reference.

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Wideband MIMO Antenna Systems Based on Coupled-Loop Antenna for 5G N77/N78/N79 Applications in Mobile Terminals

Cited by 101 publications

References 29 publications

Ultra-Wideband Diversity MIMO Antenna System for Future Mobile Handsets

Ultra-Wideband Diversity MIMO Antenna System for Future Mobile Handsets

A Compact and Straightforward Self-Decoupled MIMO Antenna System for 5G Applications

An Improved Loop Ultra-Wideband Mimo Antenna System for 5g Mobile Terminals

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