A compact wide band textile MIMO antenna with very low mutual coupling for wearable applications

Biswas, Ashim Kumar; Chakraborty, Ujjal

doi:10.1002/mmce.21769

Cited by 37 publications

(46 citation statements)

References 27 publications

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“…x (1) x (2) x (3) x (4) x (5) x (6) x (7) x (8) x (9) x (10) Objectives Table 1: x (1) (-), x (4) (ÁÁÁÁ), x (7) (---), and x (10) (-o-)…”

Section: Benchmarking and Discussionunclassified

“…Miniaturization of microwave components has become an important design consideration due to the emergence of space‐limited applications, including mobile communications, wearable/implantable devices, sensors, biomedicine, body area networks, and so forth. Compact implementations of microwave circuits can be achieved in various ways; some of the popular techniques include utilization of high‐permittivity substrates, transmission line (TL) folding, employing the slow‐wave phenomenon, in particular, replacing conventional TLs by their shorter counterparts (eg, compact microwave resonant cells, CMRCs), or multilayer realizations (eg, low temperature cofired ceramic technology).…”

Section: Introductionmentioning

confidence: 99%

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Accelerated multiobjective design of miniaturized microwave components by means of nested kriging surrogates

Pietrenko‐Dabrowska

Koziel

2020

Int J RF Microw Comput Aided Eng

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Design of microwave components is an inherently multiobjective task. Often, the objectives are at least partially conflicting and the designer has to work out a suitable compromise. In practice, generating the best possible trade‐off designs requires multiobjective optimization, which is a computationally demanding task. If the structure of interest is evaluated through full‐wave electromagnetic (EM) analysis, the employment of widely used population‐based metaheuristics algorithms may become prohibitive in computational terms. This is a common situation for miniaturized components, where considerable cross‐coupling effects make traditional representations (eg, network equivalents) grossly inaccurate. This article presents a framework for accelerated EM‐driven multiobjective design of compact microwave devices. It adopts a recently reported nested kriging methodology to identify the parameter space region containing the Pareto front and to render a fast surrogate, subsequently used to find the first approximation of the Pareto set. The final trade‐off designs are produced in a separate, surrogate‐assisted refinement process. Our approach is demonstrated using a three‐section impedance matching transformer designed for the best matching and the minimum footprint area. The Pareto set is generated at the cost of only a few hundred of high‐fidelity EM simulations of the transformer circuit despite a large number of geometry parameters involved.

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“…x (1) x (2) x (3) x (4) x (5) x (6) x (7) x (8) x (9) x (10) Objectives Table 1: x (1) (-), x (4) (ÁÁÁÁ), x (7) (---), and x (10) (-o-)…”

Section: Benchmarking and Discussionunclassified

Section: Introductionmentioning

confidence: 99%

Accelerated multiobjective design of miniaturized microwave components by means of nested kriging surrogates

Pietrenko‐Dabrowska

Koziel

2020

Int J RF Microw Comput Aided Eng

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“…Consider the impedance-matching transformer shown in Figure 4B, 63 x (1) x (2) x (3) x (4) x (5) x (6) x (7) x (8) x (9) x (10) Objectives In the optimization process, we consider two objectives:…”

Section: Impedance-matching Transformer: Circuit Description and Dementioning

confidence: 99%

“…Size reduction of circuits and systems is an important aspect of contemporary microwave design. [1][2][3][4] Miniaturization has become essential for a number of space-limited application areas such as mobile communications, 5 internet of things (IoT), 6 sensors, 7 biomedicine, 8 wearable and implantable devices, 9 and body area networks. 10 A number of techniques have been developed to permit compact realization of microwave passives.…”

Section: Introductionmentioning

confidence: 99%

Low‐cost multi‐criteria design optimization of compact microwave passives using constrained surrogates and dimensionality reduction

Koziel

Pietrenko‐Dabrowska

Al‐Hasan

2020

Int J Numerical Modelling

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Design of contemporary microwave circuits is a challenging task. Typically, it has to take into account several performance requirements and constraints.The design objectives are often conflicting and their simultaneous improvement may not be possible; instead, compromise solutions are to be sought. Representative examples are miniaturized microwave passives where reduction of the circuit size has a detrimental effect on its electrical characteristics. Acquiring information about the best possible design trade-offs is invaluable for the designer, yet it entails computationally expensive multi-objective optimization (MO). MO is typically conducted using population-based metaheuristic algorithms, the cost of which might be extremely high. If the circuit performance is evaluated using full-wave electromagnetic (EM) analysis, this cost is often prohibitive. A workaround is the employment of fast surrogate models, and a number of surrogate-assisted frameworks have been proposed in the literature. Unfortunately, a construction of reliable surrogates is hindered in higher dimensional parameter spaces. The recently proposed constrained modeling mitigates this issue to a certain extent by restricting the modeling process to the region containing the Pareto front to be found. This work proposes a novel surrogate-based MO technique that involves constrained modeling and explicit reduction of the surrogate domain dimensionality. The latter is achieved through the spectral analysis of the extreme Pareto-optimal design set obtained by local search routines. Our methodology is validated using a 15-parameter impedance-matching transformer with the Pareto set identified at the cost of a few hundred EM analyses of the circuit. The numerical experiments also demonstrate a significant reduction of the optimization cost as compared to the state-of-the-art surrogate-assisted MO methods.

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“…So, ultra-wideband (UWB) [31,32] is considered as the only solution to capture all the operating associated bands in 3.1-10.6 GHz. Another challenge is to fit appropriate antenna and generate multiple resonating spectrums [33][34][35]. Thus, the phenomenon of self-similar antenna structures commonly known as Fractals, is introduced and considered as the optimum solution, as it provides multi-resonances with wide bandwidth [36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Characteristics Mode Analysis: A Review of Its Concepts, Recent Trends, State-of-the-Art Developments and Its Interpretation With a Fractal Uwb Mimo Antenna

Mohanty¹,

Behera²

2021

PIER B

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In this article, we present a compact and efficient diametrically-fed dual port fractal UWB MIMO antenna for portable handheld wireless devices. The electromagnetic behaviour on conducting body is analyzed through classical approach based characteristics mode analysis (CMA). Their intrinsic characteristics are explored on the basis of (a) modal surface current distributions, (b) narrow/broad bandwidth capability, and (c) radiation potentials. Concurrent analysis is persuaded on a diametricallyfed dual-port fed fractal conducting surface, which provides interesting facets on the combinatory effect of electromagnetic performance and physical behaviour on metallic radiator, metallic ground planes (unconnected/connected) and combination of two aforementioned metallic compact geometries. Theoretical insights are investigated for essential/non-essential modes existing in proposed geometry. The investigation through CMA also gives plethoric information on the feed location of antenna on modal surface currents and similar trends to capture its radiation potentials on the current nulls existing in the physical body. A broad classification of modes is explained, covering the CMA modal dynamics such as (a) characteristics angle (CA), (b) eigenvalues (EV), and (c) modal significance (MS). These additive parameters in general reflect the resemblance of Q-factor ≈ B.W. for narrowband/wideband traits, electrically/magnetically coupled energy behaviour, and radiative potential for far-field propagation. Thus, in a nutshell , it can be concluded that 'CMA provides physically intuitive guidance for the analysis and designing of antenna structures'. To support the findings highlighted in this particular study, a concise review about the theory of characteristic modes and the practical examples that use such concepts are taken into consideration.

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A compact wide band textile MIMO antenna with very low mutual coupling for wearable applications

Cited by 37 publications

References 27 publications

Accelerated multiobjective design of miniaturized microwave components by means of nested kriging surrogates

Accelerated multiobjective design of miniaturized microwave components by means of nested kriging surrogates

Low‐cost multi‐criteria design optimization of compact microwave passives using constrained surrogates and dimensionality reduction

Characteristics Mode Analysis: A Review of Its Concepts, Recent Trends, State-of-the-Art Developments and Its Interpretation With a Fractal Uwb Mimo Antenna

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