A compat UWB MIMO antenna with high isolation and low correlation for wireless applications

Chithradevi, R.; Sreeja, B. S.

doi:10.1109/iaim.2017.8402534

Cited by 20 publications

(23 citation statements)

References 9 publications

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“…Then, by factoring | a 1 |, the TARC equation for two antennas described in Equation was derived. This expression can be found in References applied correctly, and in Reference mistakenly applied to a four‐element set of antennas.

italicTARC = \frac{\sqrt{{(||, S_{11} + S_{12} e^{jθ})}^{2} + {(||, S_{21} + S_{22} e^{jθ})}^{2}}}{\sqrt{2}}

…”

Section: Application Of Tarc To a Pair Of Mimo Antennasmentioning

confidence: 99%

“…To satisfy this equation, θ = | φ 11 − φ 12 | = | φ 21 − φ 22 |, a condition that can be accomplished a reduced number of times throughout frequencies, and if and only if the scattering matrix is perfectly symmetrical. In this case, if the “coupling coefficients” values, namely S 12 and S 21 magnitudes, are lowered by one or more isolation techniques, and S 12 = S 21 , TARC reflects the behavior of the reflection coefficient of a single antenna . Indeed:

\lim_{\begin{matrix} S_{12}, s_{21} \to 0 \\ S_{11} = S_{22} \end{matrix}} {TARC}_{(1)} = 2^{- 0.5} \sqrt{{|S_{11}|}^{2} + {|S_{11}|}^{2}} = (||, S_{11})

…”

Section: Application Of Tarc To a Pair Of Mimo Antennasmentioning

confidence: 99%

“…In this case, if the "coupling coefficients" values, namely S 12 and S 21 magnitudes, are lowered by one or more isolation techniques, and S 12 = S 21 , TARC reflects the behavior of the reflection coefficient of a single antenna. 10,12,13,15 Indeed:…”

Section: Influence Of the Random Phasementioning

confidence: 99%

“…However, several authors have issued on leading journals on Antennas and Microwave Techniques imprecise equations to compute TARC on MIMO antennas, which disregard the information of random phases, and its impact on the performance of the antenna system vs frequency. After an examination of the state‐of‐the‐art on MIMO arrays performed by the authors of this work, it was found that many papers reported a correct evaluation of TARC expression by displaying a family of curves, given by the variations on the random phases θ i , along with the computation of other adequate antenna metrics. Whereas in several other papers a wrong version of the equation was used; or only one curve was displayed without a mathematical explanation of how it was derived; only one value at the resonance frequencies was reported in a table; and, finally, one curve obtained by averaging an unknown number of TARC curves was given .…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The correct application of total active reflection coefficient to evaluate MIMO antenna systems and its generalization to N ports

Fritz‐Andrade

Jardón‐Aguilar

Tirado‐Méndez

2019

Int J RF Microw Comput Aided Eng

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Several papers published by prestigious Journals on Antennas and Microwave Techniques have disseminated misconceptions about total active reflection coefficient (TARC), a meaningful metric to characterize multiple‐input multiple‐output antenna arrays, and the misapprehension has been spread over the years. In this article, an extrapolation to calculate TARC for N‐antennas systems is derived and applied to published results for illustration purposes. Moreover, the inaccurate and correct TARC equations are put in context by means of its physic and mathematical insight, demonstrating the divergence of results when the interport RF isolation is comparable or higher than the port matching. The importance of assessing multiantenna systems using TARC is explained.

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italicTARC = \frac{\sqrt{{(||, S_{11} + S_{12} e^{jθ})}^{2} + {(||, S_{21} + S_{22} e^{jθ})}^{2}}}{\sqrt{2}}

…”

Section: Application Of Tarc To a Pair Of Mimo Antennasmentioning

confidence: 99%

\lim_{\begin{matrix} S_{12}, s_{21} \to 0 \\ S_{11} = S_{22} \end{matrix}} {TARC}_{(1)} = 2^{- 0.5} \sqrt{{|S_{11}|}^{2} + {|S_{11}|}^{2}} = (||, S_{11})

…”

Section: Application Of Tarc To a Pair Of Mimo Antennasmentioning

confidence: 99%

Section: Influence Of the Random Phasementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The correct application of total active reflection coefficient to evaluate MIMO antenna systems and its generalization to N ports

Fritz‐Andrade

Jardón‐Aguilar

Tirado‐Méndez

2019

Int J RF Microw Comput Aided Eng

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show abstract

“…As a result, compact antennas with band-notch properties are required to ensure the reliability of UWB communication. Several strategies have been devised to create a compact UWB-MIMO antenna with band-notch characteristics that can be used throughout the UWB spectrum [16][17][18][19][20][21][22][23][24][25][26][27]. A fourport UWB-MIMO antenna with dual polarization is proposed in [16].…”

Section: Introductionmentioning

confidence: 99%

Miniaturized Quad-Port Uwb-Mimo Antenna With Band-Notched Characteristics at 5 GHZ

Al-Gertany¹,

Farhan²

2022

PIER C

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Small footprint of the multi-input-multi-output (MIMO) antenna is extremely desirable for space-constrained ultra-wideband (UWB) communication systems. Compact MIMO antennas with improved isolation and wide operating bandwidth are the significant subject of the work. Therefore, this paper presents a miniaturized four-port polarization diversity UWB-MIMO antenna operating in the frequency range of 3.1-12 GHz with band-notched characteristics. Four octagon-shaped radiating elements with a common ground are placed orthogonal to each other for good isolation. Band rejection features between 4.5 and 5.5 GHz were achieved by including an open-ended slot at the upper edge of the octagonal-shaped antenna. The MIMO antenna was etched on a low-cost 32.3 × 32.3 × 0.8 mm 3 FR-4 dielectric substrate. The antenna radiates in a quasi-omnidirectional pattern on the H-plane throughout the operational bandwidth, with higher than 15 dB isolation, low envelope correlation, and high antenna gain. As a result, this antenna is well suited for diverse applications and portable devices.

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Rectangular strip engraved circular patch and connected corrugated stub-based MIMO antenna for Wi-Fi/5G/WiMAX/satellite communication applications

Almawgani

Sorathiya

2023

Appl. Phys. A

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A compat UWB MIMO antenna with high isolation and low correlation for wireless applications

Cited by 20 publications

References 9 publications

The correct application of total active reflection coefficient to evaluate MIMO antenna systems and its generalization to N ports

The correct application of total active reflection coefficient to evaluate MIMO antenna systems and its generalization to N ports

Miniaturized Quad-Port Uwb-Mimo Antenna With Band-Notched Characteristics at 5 GHZ

Rectangular strip engraved circular patch and connected corrugated stub-based MIMO antenna for Wi-Fi/5G/WiMAX/satellite communication applications

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