Compact reconfigurable multiple‐input‐multiple‐output antenna for ultra wideband applications

Jafri, Syeda Irum; Saleem, Rashid; Shafique, Muhammad Farhan; Brown, Anthony K.

doi:10.1049/iet-map.2015.0181

Cited by 64 publications

(49 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such an interval can be determined by measuring TARC of the assessed design and assuring that its value does not overpass an agreed limit. This last argument dismisses to that presented in References , which proclaims that TARC < 0 is a sufficient condition to declare an antenna as suitable for diversity applications.…”

Section: Application Of Tarc To a Pair Of Mimo Antennasmentioning

confidence: 85%

“…Equation is similar to the one reported in References . 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.…”

Section: Application Of Tarc To a Pair Of Mimo Antennasmentioning

confidence: 86%

“…These divergences cannot be observed when and are applied on a design that exhibits | S ik | i ≠ k > | S ii |. In Reference , authors show that their implemented back‐to‐back configuration has a poor port matching around the UWB lowest frequencies, and | S 21 | values are between −10 and − 20 dB. This could explain the unavoidable differences between “simulated” and “measured” TARC curves plotted around the 3 GHz band.…”

Section: Application Of Tarc To a Pair Of Mimo Antennasmentioning

confidence: 99%

“…As predicted in this paper, TARC curves do not converge with the S ii ones. Equation , reported in References also fails to describe the general performance of the system impedance bandwidth, by giving an unreal optimistic vision.…”

Section: Application Of the Correct Equation Of Tarc To Published Resmentioning

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

View full text Add to dashboard Cite

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.

show abstract

Section: Application Of Tarc To a Pair Of Mimo Antennasmentioning

confidence: 85%

Section: Application Of Tarc To a Pair Of Mimo Antennasmentioning

confidence: 86%

Section: Application Of Tarc To a Pair Of Mimo Antennasmentioning

confidence: 99%

Section: Application Of the Correct Equation Of Tarc To Published Resmentioning

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

View full text Add to dashboard Cite

show abstract

“…The wideband designs result in moderate performance of the systems in these particular bands. There are various MIMO antenna designs in literature which include [8], in which two element MIMO system for ultra-wide band (UWB) operation is proposed. The disadvantage of the system is its large size and poor TARC and ECC characteristics.…”

mentioning

confidence: 99%

A Compact Planar Inverted F Antenna Array For Wireless LTE Portable Devices

Soni¹

2017

IJRASET

View full text Add to dashboard Cite

Multiple Input Multiple Output antenna systems have been the key reasons behind tremendous increase in speed with which data can be transferred through air. The focus area with these antenna designs has been to obtain small size with good performance of the system. In this paper a MIMO antenna system is proposed that is made up of two PIFA elements. The system is capable of operating in advanced LTE In recent times, MIMO platforms have been worked upon to reduce their dimensions in order to incorporate more antenna terminals on a single platform. The problem with the reduced size of the MIMO systems is the increase in mutual coupling between antenna terminals [3]. This interaction between electromagnetic radiation of the antenna elements lead to degradation in the performance parameters of the MIMO system [4]. Many performance enhancement techniques to improve the performance of closely spaced MIMO antenna elements systems have been proposed. These techniques include the use of defected ground structures, impedance transformers, neutralization lines, parasitic components etc. These techniques try to divert the direction of the surface current flowing on the antenna surface to reduce electromagnetic interaction between antenna elements [5], [6]. The disadvantages of above mentioned techniques are their complex geometry and comparatively large design. Recently, a performance enhancement technique using metamaterial structures is being used in MIMO antenna systems to reduce the mutual interaction between elements and increase the overall performance of the system. Metamaterial are negative permeability material structures that offer imaginary propagation constant for surface electromagnetic waves and hence curtail them from propagating from one terminal to another. This results in a reduction in mutual coupling and an increase in the isolation [7]. This reduction in mutual coupling reflects on the performance of the MIMO system also with improved MIMO coefficients like TARC, ECC and Channel Capacity Loss. MIMO systems that exist in literature focus on wideband operations but there are hardly any systems which primarily focus upon advanced LTE bands. The wideband designs result in moderate performance of the systems in these particular bands. There are various MIMO antenna designs in literature which include [8], in which two element MIMO system for ultra-wide band (UWB) operation is proposed. The disadvantage of the system is its large size and poor TARC and ECC characteristics. In [9], a wide-band

show abstract

Computational analysis of a dual‐port semi‐circular patch antenna combined with Koch curve fractals for ultra‐wideband systems

Sohi

Kaur

2021

Engineering Reports

View full text Add to dashboard Cite

This paper presents a two-port microstrip-fed semi-circular patch antenna integrated with Koch curve fractals and common ground with defected ground structure for the effective implementation in handheld ultra-wideband (UWB) systems. The proposed array is engraved on a 1.57 mm thick FR-4 substrate with an overall array size of 30.5 × 47 × 1.64 mm 3 . The parametric analysis of the proposed array indicates that the two optimized Koch curve fractal (second iteration order) radiators (upper substrate layer) provides an optimum matching performance in a wide operational band (4.395-10.184 GHz, 79.4%) and minimizes the patch area by 41.2% as compared to the conventional circular patch. To realize good port-to-port isolation (S 21 /S 12 ≤ −16.8 dB), the reduced ground is slotted and incorporated with a funnel-shaped decoupling structure at the center. The prototype of the proposed array is fabricated and experimentally tested to justify the simulated S-parameter results. All diversity metrics like envelope correlation coefficient, diversity gain (DG), mean effective gain, channel capacity loss, and total active reflection coefficient lie within their acceptable limits which affirm a high signal-to-noise ratio and the proficiency of the proposed array in the development of high data-rate UWB communication devices. K E Y W O R D Sdefected ground structure (DGS), Koch curve fractal, multiple-input multiple-output (MIMO), ultra-wideband (UWB)This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

show abstract

Compact reconfigurable multiple‐input‐multiple‐output antenna for ultra wideband applications

Cited by 64 publications

References 20 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

A Compact Planar Inverted F Antenna Array For Wireless LTE Portable Devices

Computational analysis of a dual‐port semi‐circular patch antenna combined with Koch curve fractals for ultra‐wideband systems

Contact Info

Product

Resources

About