Mutual Coupling Mitigation in Broadband Multiple-Antenna Communication Systems Using Feedforward Technique

Amjadi, S. Mohammad; Sarabandi, Kamal

doi:10.1109/tap.2016.2535101

Cited by 23 publications

(11 citation statements)

References 15 publications

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“…Consequently, the mutual coupling reduction technique, or termed as the antenna decoupling technique has drawn great attention from both the academia as well as the industry. The existing and developing decoupling solutions include: neutralization lines 7 , 8 ; decoupling with parasitic scatters 9 , 10 ; eigen-mode decomposition techniques 11 – 14 and passive decoupling networks 15 – 19 . However, only a few of them can be readily extended to Massive MIMO antenna arrays with dozens of elements.…”

Section: Introductionmentioning

confidence: 99%

A Meta-Surface Antenna Array Decoupling (MAAD) Method for Mutual Coupling Reduction in a MIMO Antenna System

Wang

Zhao

Cai

et al. 2018

Sci Rep

100

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In this paper, a method to reduce the inevitable mutual coupling between antennas in an extremely closely spaced two-element MIMO antenna array is proposed. A suspended meta-surface composed periodic square split ring resonators (SRRs) is placed above the antenna array for decoupling. The meta-surface is equivalent to a negative permeability medium, along which wave propagation is rejected. By properly designing the rejection frequency band of the SRR unit, the mutual coupling between the antenna elements in the MIMO antenna system can be significantly reduced. Two prototypes of microstrip antenna arrays at 5.8 GHz band with and without the metasurface have been fabricated and measured. The matching bandwidths of antennas with reflection coefficient smaller than −15 dB for the arrays without and with the metasurface are 360 MHz and 900 MHz respectively. Using the meta-surface, the isolation between elements is increased from around 8 dB to more than 27 dB within the band of interest. Meanwhile, the total efficiency and peak gain of each element, the envelope correlation coefficient (ECC) between the two elements are also improved by considerable amounts. All the results demonstrate that the proposed method is very efficient for enhancing the performance of MIMO antenna arrays.

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Section: Introductionmentioning

confidence: 99%

A Meta-Surface Antenna Array Decoupling (MAAD) Method for Mutual Coupling Reduction in a MIMO Antenna System

Wang

Zhao

Cai

et al. 2018

Sci Rep

100

View full text Add to dashboard Cite

show abstract

“…Several types of transmission lines that directly connect adjacent antenna elements have also been applied to reduce the mutual coupling. These transmission lines provide effective decoupling current pathways; examples include neutralization lines [30][31][32] and feedforward lines [33]. A second class of mutual coupling suppressors relies on the construction of decoupling networks behind the radiators.…”

mentioning

confidence: 99%

Mutual Coupling Reduction Using Meta-Structures for Wideband, Dual-Polarized, and High-Density Patch Arrays

Tang

Chen

Wang

et al. 2017

IEEE Trans. Antennas Propagat.

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-A mutual coupling reduction strategy that employs meta-structures is introduced for wideband, dual-polarized, high-density, planar, patch antenna arrays. The meta-structures consist of two types of resonators: grounded capacitively loaded loops (GCLLs) and π-shaped elements. By incorporating the meta-structures into the array configuration, the isolation levels between adjacent radiating elements in both the E-and H-plane orientations are improved by as much as 7.15 dB. The surface current distribution behaviors of the array with only the GCLLs and with only the π-shaped elements are investigated thoroughly to explain the mutual coupling reduction mechanisms. A proof-of-concept array was constructed and tests were performed that validate the reported design principles and simulation results. M. (5G) communication systems [1,2]. It has several unique advantages that arise from its ability to facilitate the presence of additional signal channels instead of requiring the use of extra frequency spectrum or power. Benefits include being able to increase the data capacity and to make the system more adaptable. Index TermsMIMO approaches are based on antenna arrays. With the ever increasing demand for more capacity, it is anticipated that massive MIMO will be central to 5G systems; and it will be facilitated by compact dense arrays. However, strong inter-element coupling occurs when the element spacing is small; it dramatically increases the spatial correlations and seriously deteriorates the signal-to-interference-plus-noise -ratio (SINR) [3]. Consequently, mutual coupling effects between array elements have attracted intense attention.There exist a plethora of reported approaches that are capable of reducing the mutual coupling in the physical layer. However, because of known fundamental physical limitations [4], it cannot be eliminated completely. Nevertheless, mutual coupling reduction can significantly improve the performance of MIMO systems.In general, the existing, most widely used mutual coupling reduction strategies can be classified into the following three categories. One approach focuses on introducing a variety of compact isolation elements between the radiators. The choices have been rather diverse. They include parasitic elements, such as monopoles [5], scatterers [6], and radiation patches [7]. Also, they include electromagnetic band-gap (EBG) structures, such as mushroom-like EBG structures [8], F-shaped EBG structures [9], and uniplanar compact EBG structures [10,11]. Defected ground structures (DGSs), such as periodic rectangular slits [12], back-to-back U-shaped slots [13], T-shaped slots [14], and loop slots [15] have also been used. More recently, numerous metamaterial-inspired structures have been considered, such as folded single split ring resonators [16], grounded split-ring resonators (GSRRs) [17], multiple split-ring resonators (MSRRs) [18] While the above strategies have reduced mutual coupling, one witnesses certain drawbacks accompanying each of them. As a result, their widespre...

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“…In [11] for example, a decoupling network consisting in transmission lines placed between source feeds of a 1×16 element array reduces the coupling between adjacent sources to lower than -35 dB at the center frequency, allowing the array to scan up to 66°. In [12] and [13], the connection is established directly on the radiating elements themselves, Experimental Validation of a Correcting Coupling Mechanism to Extend the Scanning Range of Narrow-Band Phased Array Antennas Aurelien Ayissi Manga, Raphael Gillard, Renaud Loison, Isabelle Le Roy-Naneix, Christian Renard W resulting in greater ease of implementation. A reduction of 10dB in the mutual coupling between adjacent sources is achieved, in the context of MIMO applications.…”

Section: Introductionmentioning

confidence: 99%

“…Present work aims at mitigating the detrimental effect of the initial coupling wave in order to ensure good impedance matching over a scanning range as wide as possible. To do so, we utilize a similar approach to the one used in [12][13], i.e. with the connecting lines at the same level as the patches for lower impact on the feeding network.…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of a Correcting Coupling Mechanism to Extend the Scanning Range of Narrowband Phased Array Antennas

Manga

Gillard

Loison

et al. 2020

IEEE Trans. Antennas Propagat.

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This paper presents a technique designed to extend the scanning range of a probe-fed patch array whose performances are limited by scan blindness, due to a strong surface wave coupling. The current framework relates to the context of radar applications requiring a large scanning range (up to 60°) and where no inter-element spacing modification is possible as a result of strong T/R modules integration constraints. The proposed solution is based on the introduction of an additional correcting coupling within the array, by means of microstrip lines connecting the sources two by two. A thorough step-by-step description of the design methodology is introduced. It is then implemented in the case of a single-polarized 10element patch array operating in X band. Simulation results as well as an experimental validation of the concept are presented. They assess the effective improvement of the active impedance matching and realized gain resulting from the use of connecting lines.

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Mutual Coupling Mitigation in Broadband Multiple-Antenna Communication Systems Using Feedforward Technique

Cited by 23 publications

References 15 publications

A Meta-Surface Antenna Array Decoupling (MAAD) Method for Mutual Coupling Reduction in a MIMO Antenna System

A Meta-Surface Antenna Array Decoupling (MAAD) Method for Mutual Coupling Reduction in a MIMO Antenna System

Mutual Coupling Reduction Using Meta-Structures for Wideband, Dual-Polarized, and High-Density Patch Arrays

Experimental Validation of a Correcting Coupling Mechanism to Extend the Scanning Range of Narrowband Phased Array Antennas

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