Analysis of the Envelope Correlation Coefficient of MIMO Antennas Connected with Suspended Lines

Kim, Seung‐Ho; Chung, Jae‐Young

doi:10.26866/jees.2020.20.2.83

Cited by 22 publications

(15 citation statements)

References 13 publications

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“…The proposed antenna diversity performance is examined by envelope correlation coefficient (ECC), diversity gain (DG), total active reflection coefficient (TARC), and channel capacity loss (CCL) 33,34 is shown in Figure 9.…”

Section: Resultsmentioning

confidence: 99%

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Circularly polarized hybrid mode substrate integrated waveguide antenna for two quadrant scanning beamforming applications for 5G

Verma

Raghava

2021

Int J RF Microw Comput Aided Eng

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Electromagnetic band gap (EBG) based two ports multiple-input and multipleoutput (MIMO) substrate integrated waveguide (SIW) antenna for two quadrant beamforming applications using metasurfaces (MS) is addressed. A novel SIW structure is employed to achieve beamforming. This work comprises two types of vias having different diameters and lengths in order to achieve multibeam in the first and second quadrant with 120 coverage. Two cross slots tilted at AE45 are etched on top of the structure. The width variation of one of the cross slots achieved beam scanning in first quadrant with coverage of 90 . Additionally, four circular slots are etched on the top metallic layer to improve the axial ratio and the gain of the antenna. Apart from that, two diagonally etched slots help to enhance the gain and radiation properties of the antenna. Furthermore, to get the good mutual coupling and isolation between the two ports, EBG unit cells are deployed on the ground. The proposed antenna shows good right hand circularly polarized radiation within the band with the help of MS deployed on an extended part of the substrate. MS also improves the return loss bandwidth. In the end, the diversity properties of the MIMO have been studied as well. The proposed antenna shows good performance in all respects for 5G applications.

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Section: Resultsmentioning

confidence: 99%

“…Proposed antenna simulated and measured results A, Realized gain, B, Radiation efficiency, and C, Axial ratio radiation patterns when the antenna efficiency is high. 33,34 The ECC can be calculated by the following equation:…”

Section: Resultsmentioning

confidence: 99%

Circularly polarized hybrid mode substrate integrated waveguide antenna for two quadrant scanning beamforming applications for 5G

Verma

Raghava

2021

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 99%

“…The envelope correlation coefficient can be calculated using the S‐parameters method instead of far field radiation patterns when the antenna efficiency is high 33 . ‐ 34 The ECC can be calculated by the following equation:

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

…”

Section: Resultsmentioning

confidence: 99%

Circularly polarized hybrid mode substrate integrated waveguide antenna for two quadrant scanning beamforming applications for 5G

Verma

Raghava

2021

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

Electromagnetic band gap (EBG) based two ports multiple‐input and multiple‐output (MIMO) substrate integrated waveguide (SIW) antenna for two quadrant beamforming applications using metasurfaces is addressed. A novel SIW structure is employed to achieve beamforming. This work comprises two types of vias having different diameters and lengths in order to achieve multibeam in the first and second quadrant with 120° coverage. Two cross slots tilted at ±45normal° are etched on top of the structure. The width variation of one of the cross slots achieved beam scanning in first quadrant with coverage of 90°. Additionally, four circular slots are etched on the top metallic layer to improve the axial ratio and the gain of the antenna. Apart from that, two diagonally etched slots help to enhance the gain and radiation properties of the antenna. Furthermore, to get the good mutual coupling and isolation between the two ports, EBG unit cells are deployed on the ground. The proposed antenna shows good right hand circularly polarized radiation within the band with the help of metasurfaces (MS) deployed on an extended part of the substrate. MS also improves the return loss bandwidth. In the end, the diversity properties of the MIMO have been studied as well. The proposed antenna shows good performance in all respects for 5G applications.

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“…The parameter that shows how much MIMO antennas are independent in their individual performance, for instance, radiation patterns and polarization is the envelope correlation coefficient (ECC) [30]. Equation ( 3) and ( 4) is used to compute the ECC (ρeij) for the MIMO antenna system both the S-parameters and far-field radiation respectively [20].…”

Section: Envelope Correlation Coefficient (Ecc)mentioning

confidence: 99%

Isolation Enhancement of a Metasurface-Based MIMO Antenna Using Slots and Shorting Pins

et al. 2021

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In this paper, a metasurface-based multiple-input multiple-output (MIMO) antenna with high isolation between antenna elements is presented. The main patch radiator is sandwiched between a metasurface and a ground plane to achieve performance enhancement. The fabricated single element antenna has a compact size of 0.85λ0 × 0.85λ0 × 0.038λ0. The antenna exhibits a wideband operational bandwidth from 3.27 to 3.82 GHz for |S11| < −10, which corresponds to a fractional bandwidth of 15.5%. Moreover, stable radiation patterns with a peak gain of 8.1 dBi are also achieved across the operating band. The proposed single element antenna is characterized for 2 × 2 MIMO system by translating each antenna element orthogonal to each other. A decoupling structure consisting of slots and metallic strip with shorting pins is used to improve the isolation between the MIMO elements. The shorting pins connect the metallic strips (located between MIMO elements) on the metasurface and ground plane. These slots on ground plane and shorting pins affect the electromagnetic field distribution and consequently reduce the mutual coupling. The fabricated MIMO antenna has a compact size of 1.75λ0 × 1.75λ0 × 0.038λ0. The proposed 4 port (2×2) MIMO antenna provides 15.9% of 10 dB impedance bandwidth from 3.3 to 3.87 GHz with a peak gain of 8.72 dBi. Moreover, the proposed MIMO antenna offers excellent diversity performance, isolation between antenna elements is very high (>32dB), ECC is lower than 0.001, and diversity gain is 9.99 dB very close to the ideal value of 10dB. Owing to these features, the proposed MIMO antenna can be a good candidate for 5G Sub-6 GHz (n78 band) smart devices and sensors.

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Analysis of the Envelope Correlation Coefficient of MIMO Antennas Connected with Suspended Lines

Cited by 22 publications

References 13 publications

Circularly polarized hybrid mode substrate integrated waveguide antenna for two quadrant scanning beamforming applications for 5G

Circularly polarized hybrid mode substrate integrated waveguide antenna for two quadrant scanning beamforming applications for 5G

Circularly polarized hybrid mode substrate integrated waveguide antenna for two quadrant scanning beamforming applications for 5G

Isolation Enhancement of a Metasurface-Based MIMO Antenna Using Slots and Shorting Pins

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