A Transmission-Line-Based Decoupling Method for MIMO Antenna Arrays

Zhang, Yiming; Zhang, Shuai; Li, Jialin; Pedersen, Gert Frølund

doi:10.1109/tap.2019.2900406

Cited by 90 publications

(98 citation statements)

References 27 publications

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“…Because a metasurface is usually made up of numbers of metallic cells, occupying a large space, the employment of metasurfaces may cause size increase in M-MIMO antennas. For decoupling networks, it is not easy to achieve good decoupling performance over a wide band [16], [18]. Besides, the implementation of the decoupling networks could be complicated and may not be adequate to be installed on a large scale in a M-MIMO antenna.…”

Section: Measurement Of the Mimo Antenna With The Decoupling Strucmentioning

confidence: 99%

“…The resonating metal decoupling structures may have large size and thus cannot be directly used for dual-polarized MIMO antenna. To the best of the authors' knowledge, only the decoupling structures presented in [10], [18] and [25] claim M-MIMO antenna applications. However, they can only afford a bandwidth less than 16%, which is not wide enough for 5G applications.…”

Section: Measurement Of the Mimo Antenna With The Decoupling Strucmentioning

confidence: 99%

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Embeddable Structure for Reducing Mutual Coupling in Massive MIMO Antennas

Qin

Cui

2020

IEEE Access

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An embeddable decoupling structure is proposed for massive multiple-input-multiple-output (M-MIMO) antennas in this paper. The embeddable decoupling structure is made up of an end-folded metal strip and a pair of C-shaped metal strips. By introducing the embeddable decoupling structure near two closely spaced dipole antennas, additional coupling can be generated to counterbalance the original mutual coupling between the dipole antennas. The decoupling structure is firstly designed for a 1×2 MIMO antenna, which can provide a reduction of about 5 dB for the mutual coupling. Then, an evolutional decoupling structure is designed, which is composed of a pair of inverted U-shaped metal strips and two parallel reversed C-shaped metal strips. The evolutional decoupling structure is employed in a 3×3 MIMO antenna operating in 5G bands to demonstrate its capability of decoupling. An average reduction of about 10 dB on mutual coupling is obtained over 3.3-4.5 GHz (30.8%). Moreover, it is found that the deteriorated radiation patterns due to the mutual coupling are improved. The decoupling structure can be totally embedded in a M-MIMO antenna, which has no increase in the antenna volume. The proposed decoupling structure exhibits advantages of radiation pattern distortion alleviation, wideband, embeddable, and dual-polarized capabilities for M-MIMO applications.

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Section: Measurement Of the Mimo Antenna With The Decoupling Strucmentioning

confidence: 99%

Section: Measurement Of the Mimo Antenna With The Decoupling Strucmentioning

confidence: 99%

Embeddable Structure for Reducing Mutual Coupling in Massive MIMO Antennas

Qin

Cui

2020

IEEE Access

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“…The U-shaped NL add on the microstrip feeder line of the antenna and inverted U-shaped NL contacts with two radiation elements. The design of the decoupling network structure is more complicated [4], especially for multi-bands. The periodic structure [5] will increase the antenna profile and make it difficult to achieve miniaturization.…”

Section: B the Mimo Antenna Configurationmentioning

confidence: 99%

“…As we all known that improving the isolation between antenna elements is significant for the MIMO antenna. For the single band antenna, we can use the decoupling network to improve isolation [3], [4]. At the same time, the negative effects of the traditional decoupling network are compensated by adding lumped elements to the parity-mode impedance converter.…”

Section: Introductionmentioning

confidence: 99%

Neutralization Line Decoupling Tri-Band Multiple-Input Multiple-Output Antenna Design

Liu

Zheng

et al. 2020

IEEE Access

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A pair of tri-band multiple-input-multiple-output (MIMO) antennas with high isolation is investigated in this paper. The proposed antenna consists of two monopole antenna elements with an edge to edge spacing of 4 mm (0.03 λ 0 at 2.3 GHz). The monopole antenna element chose the bending line structure that can operate in tri-band and realize miniaturization. To achieve compact dimension and high isolation, symmetrical distribution layout is adopted to decouple the low frequency band, the U-shaped neutralization line (NL) contacting with two microstrip lines, and it can to improve the isolation in high frequency band, and the inverted U-shaped NL contacting with two radiation patch can decoupling in the middle frequency band. And then study the envelope correlation coefficient is lower, and the radiation pattern in operation bands is quasi-omnidirectional. It indicates that the antenna has obtained a satisfactory diversity performance within the whole operation bands which can be a good candidate for some portable MIMO applications. INDEX TERMS Multiple-input-multiple-output, tri-band, high isolation, neutralization line.

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“…Wireless components may share a broadband antenna or have multiple antennas. Multiple-input and multiple-output (MIMO) is an example of the use of multipath propagation [1][2][3][4][5]. The 5G wireless data network standard adopts a massive MIMO system [6].…”

Section: Introductionmentioning

confidence: 99%

Testing and Validation of Adaptive Impedance Matching System for Broadband Antenna

2019

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Broad RF impedance matching is challenging; however, the need for broadband matching is found frequently in modern RF and wireless systems with multiple wireless standards. Moreover, in 5G technology, multiple frequency bands are used, and these systems typically employ a broadband antenna or multiple antennas. Antenna impedances vary from design targets for many reasons including manufacturing process variations or antenna environment changes. An adaptive impedance matching system (AIMS) for testing and validation is introduced, and its implementation is shown in this paper. The AIMS can control impedance matching tuner settings to provide an arbitrary impedance frequency-varying load that meets user-defined conditions. This AIMS provides a testing and validation system for broadband antennas that can be characterized by various settings of the impedance matching tuner. As a device under test (DUT), a three-stub reconfigurable filter was used as the impedance matching tuner on a RT/Duroid 6010 RF board. It was integrated with a control circuit board. This AIMS implementation also included an antenna impedance tuner that can vary the distance between the antenna and the ground plane. This model represents practical antenna impedance variations. The AIMS controls a network analyzer and the impendence matching tuner. The adaptive control program on a PC was developed to perform an effective two-pass tuning strategy. This article presents the successful automated tuned results and their numerical evaluations of three cases that were generated by the antenna impedance tuner.

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A Transmission-Line-Based Decoupling Method for MIMO Antenna Arrays

Cited by 90 publications

References 27 publications

Embeddable Structure for Reducing Mutual Coupling in Massive MIMO Antennas

Embeddable Structure for Reducing Mutual Coupling in Massive MIMO Antennas

Neutralization Line Decoupling Tri-Band Multiple-Input Multiple-Output Antenna Design

Testing and Validation of Adaptive Impedance Matching System for Broadband Antenna

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