Characteristic mode analysis applied to reduce the mutual coupling of a four‐element patch MIMO antenna using a defected ground structure

Fritz‐Andrade, Erik; Miguel, Ángel Pérez; Gómez‐Villanueva, Ricardo; Jardón‐Aguilar, H.

doi:10.1049/iet-map.2019.0570

Cited by 35 publications

(18 citation statements)

References 52 publications

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“…The ECC is devoted to elaborate the isolated degree of signal channels between antenna array elements and the DG can reveal the impact of diversity on communication system. For two‐port antenna, ECC and DG can be determined using the following equation with S ‐parameters 17

ECC goodbreak= \frac{{(||, S_{11}^{*} S_{12} goodbreak+ S_{21}^{*} S_{22})}^{2}}{((), 1 goodbreak- ((), {|S_{11}|}^{2} goodbreak+ {|S_{21}|}^{2})) ((), 1 goodbreak- ((), {|S_{22}|}^{2} goodbreak+ {|S_{12}|}^{2}))}

DG can be calculated by ECC, 18 and the expression is displayed as follows:

DG goodbreak= 10 \sqrt{1 - {(ECC)}^{2}}

…”

Section: Antenna Parameters Analysis and Measurement Resultsmentioning

confidence: 99%

Design of a novel compound decoupling structure for multiple‐input multiple‐output antenna array

Wei

Wang

et al. 2022

Int J RF Mic Comp-Aid Eng

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A novel compound structure made up of Y‐shaped microstrip interdigital lines, slots etched into the ground plane and metallized vias embedded in the substrate is designed to enhance the isolation between H‐plane antenna array elements in this paper. Also, the operating mechanism of the decoupling structure is detailedly analyzed, as it can transform the coupling mode and suppress the transmission of surface current from one port to another. Then, after inserting the structure into the coupled antenna array, whose edge‐to‐edge distance between antenna elements is only 4 mm (0.07λ0), a 32.2 dB reduction of mutual coupling at the operating frequency 5.25 GHz is obtained. Moreover, the H‐plane radiation pattern is modified, the radiation gain is increased, and the diversity performance is improved. Simulated results are in good accordance with measured results, verifying decoupling effectiveness of the proposed structure. The proposed structure has high feasibility in the utilization of MIMO or the wireless Rx/Tx system.

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ECC goodbreak= \frac{{(||, S_{11}^{*} S_{12} goodbreak+ S_{21}^{*} S_{22})}^{2}}{((), 1 goodbreak- ((), {|S_{11}|}^{2} goodbreak+ {|S_{21}|}^{2})) ((), 1 goodbreak- ((), {|S_{22}|}^{2} goodbreak+ {|S_{12}|}^{2}))}

DG can be calculated by ECC, 18 and the expression is displayed as follows:

DG goodbreak= 10 \sqrt{1 - {(ECC)}^{2}}

…”

Section: Antenna Parameters Analysis and Measurement Resultsmentioning

confidence: 99%

Design of a novel compound decoupling structure for multiple‐input multiple‐output antenna array

Wei

Wang

et al. 2022

Int J RF Mic Comp-Aid Eng

View full text Add to dashboard Cite

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“…ECC (ρ e ) is a typical parameter that can reveal the correlation of the antenna array elements, so is DG. They can be represented as [9] ρ e = |S * 11…”

Section: Diversity Metricsmentioning

confidence: 99%

“…Until now, various decoupling technologies have been presented and can be divided into three general categories. The first type is artificial electromagnetic material, which contains electromagnetic bandgap [2], frequency selective surface [3], metasurface [4,5], defected ground structure [6][7][8][9], and array-antenna decoupling surface [10]. The second type is resonant structure [11,12], which is employed to decouple antenna arrays at certain frequencies based on its resonant characteristic.…”

Section: Introductionmentioning

confidence: 99%

Decoupling of Dual-Band Microstrip Antenna Array With Hybrid Resonant Structure

Li¹

2020

PIER Letters

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A novel hybrid resonant structure is proposed to decouple a dual-band microstrip antenna array. The decoupling structure is composed of two H-shaped strips, and the lower and upper ones respectively collaborate with an X-shaped slot to reduce mutual coupling at 4.5 GHz and 5.5 GHz. Two sub-patches of different sizes share a connection feeding line to construct the dual-band array element, which is arranged along H-plane with the edge-to-edge spacing 0.15λ l and 0.24λ h (λ l and λ h are the free-space wavelengths of 4.5 GHz and 5.5 GHz, respectively). Simulated and measured results indicate that through loading the hybrid resonant structure, 31.6 dB and 24.0 dB reductions of mutual coupling at two frequencies are obtained, while the levels of coupling coefficients are both below −30 dB in two operating bands. Moreover, the modified radiation patterns, improved diversity metrics, and weakened coupled current distributions further verify its superior decoupling capability. The proposed decoupling structure reveals its promise in being employed in communication system and multielement linearly antenna arrays.

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“…To reduce the mutual coupling, various methods have been proposed. These attempts include the use of decoupling and matching networks [5], neutralization line [6,7], parasitic branches [8,9], electromagnetic bandgap [10][11][12], and a defected ground structure (DGS) [3,4,[13][14][15][16][17][18][19][20][21] to limit the surface wave. On the one hand, the DGS structure is popularly adopted due to its unique characteristics of slow-wave propagation, which contributes to miniaturization of the antenna.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, different shapes of DGS have been proposed to reduce the mutual coupling between antenna elements. In [3,4,[13][14][15][16][17][18][19], different decoupling structures were employed between two symmetrically placed antenna elements to suppress the E-plane surface waves which are H-shaped, folded split-ring resonators, as well as complementary split-ring resonators, rectangular strip and spiral type. Meanwhile, studies by [18,19] referred to reducing the mutual coupling of dual frequency.…”

Section: Introductionmentioning

confidence: 99%

Efficient Isolation of an MIMO Antenna Using Defected Ground Structure

et al. 2020

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To implement efficient isolation between units of a multi-input multi-output (MIMO) antenna, a defected ground structure (DGS) has been investigated. An antenna with two elements operating at 5.8 GHz and fed by coaxial is considered. To reduce mutual coupling between the elements, a zigzag groove is inserted into the center of two elements formed as a DGS. To verify this design, a scattering matrix was tested, such as reflection coefficient S11 and transmission coefficient S21 between two element ports. Meanwhile, radiation pattern, current distribution, envelope correlation coefficient (ECC), and diversity gain of the antenna were simulated and measured. The results showed that the mutual coupling was reduced by 28.8 dB when a DGS was used, and the ECC was less than 0.02. Owing to these good performances, each antenna element can operate almost independently, and this MIMO antenna can be efficiently applied to the narrow band Internet of Things system.

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Characteristic mode analysis applied to reduce the mutual coupling of a four‐element patch MIMO antenna using a defected ground structure

Cited by 35 publications

References 52 publications

Design of a novel compound decoupling structure for multiple‐input multiple‐output antenna array

Design of a novel compound decoupling structure for multiple‐input multiple‐output antenna array

Decoupling of Dual-Band Microstrip Antenna Array With Hybrid Resonant Structure

Efficient Isolation of an MIMO Antenna Using Defected Ground Structure

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