A compact metamaterial with multi-band negative-index characteristics

Sarkhel, Abhishek; Mitra, Debasis; Chaudhuri, Sheli Sinha

doi:10.1007/s00339-016-0005-z

Cited by 21 publications

(17 citation statements)

References 29 publications

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“…In recent years, research in this particular area includes electrical size reduction, improvement in effective medium ratio [23], and achieving dual-band characteristics [24][25][26]. Size reduction is achieved by a common idea of raising overall inductance and capacitance in the unit cell, thus achieving lower resonant frequency.…”

Section: Introductionmentioning

confidence: 99%

“…Size reduction is achieved by a common idea of raising overall inductance and capacitance in the unit cell, thus achieving lower resonant frequency. The approaches include changing geometrical feature dimensions in the structure, that is, shortening the gaps or lengthening the metallic strips [23], and use of surface mounted capacitor [27] and high permittivity substrate as host material [25]. However, above approaches have limitations due to difficulty and complexity in the fabrication and cost and availability of high permittivity substrates.…”

Section: Introductionmentioning

confidence: 99%

“…However, above approaches have limitations due to difficulty and complexity in the fabrication and cost and availability of high permittivity substrates. The dual-band characteristic is obtained by combining different resonating structures and optimizing them to get response in desired frequency band [24][25][26]. A pair of E-LCs resonators with different sized inductive loops and capacitive gaps were shown to have two distinct electric resonances [24,25].…”

Section: Introductionmentioning

confidence: 99%

“…The dual-band characteristic is obtained by combining different resonating structures and optimizing them to get response in desired frequency band [24][25][26]. A pair of E-LCs resonators with different sized inductive loops and capacitive gaps were shown to have two distinct electric resonances [24,25]. However, shortfalls in these designs are poor coupling to external field at higher resonant frequency [24] and use of high permittivity material as substrate [25].…”

Section: Introductionmentioning

confidence: 99%

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A Compact Triple-Band Negative Permittivity Metamaterial for C, X-Band Applications

Marathe

Kulat

2017

International Journal of Antennas and Propagation

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We report a new design of triple-band electric metamaterial resonator (TBEMR) based on integration of open delta loops within square ring resonator. This metamaterial resonator has three distinct -negative regions (ENG) over C, X frequency bands. The transmission and reflection response of the proposed subwavelength resonator is analyzed using full-wave electromagnetic solver Ansys HFSS to demonstrate the presence of electrical resonances within frequencies 4-12 GHz. Effective medium parameters permittivity and permeability are extracted from simulated complex scattering parameters to verify existence of ENG regions. The investigations are also carried out regarding dependence of resonant frequencies on design parameters of the TBEMR unit cell. The effective medium ratio ( 0 / ) for proposed subwavelength resonator is compared with various other metamaterial resonators to indicate its compact nature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Compact Triple-Band Negative Permittivity Metamaterial for C, X-Band Applications

Marathe

Kulat

2017

International Journal of Antennas and Propagation

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“…Multiband LHMs could be implemented with simply arranging multiple LHM units together [20,21] or with particular elements that contain multiple resonances [22][23][24][25][26]. Such kinds of LHMs are well designed and usually have complex metallic structures for the purpose of making the μ-negative and the ɛ-negative frequency ranges overlapped.…”

Section: Introductionmentioning

confidence: 99%

A Novel Tunable Triple-Band Left-Handed Metamaterial

Elsherbeni

et al. 2017

International Journal of Antennas and Propagation

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A novel tunable triple-band left-handed metamaterial (LHM) composed of a single-loop resonator (SLR) and a variable capacitorloaded short wire pair (CL-SWP) printed on both sides of a substrate is presented in this paper. The CL-SWP-based metamaterial (MTM) is a novel single-sided LHM. It is theoretically analyzed capable of extracting tunable negative permeability and a wideband negative permittivity. We ran simulations for the CL-SWP-based MTM, the SLR-based MTM, and the proposed LHM. Together with the measured results, it is identified that this novel LHM exhibits a tunable triple-band left-handed (LH) property. With the increase of the loaded capacitance, one LH band is relatively stable, while the other two are moving towards lower frequencies with their bandwidth getting wider and narrower, respectively. The surface current density distributions indicate that the first LH band is mainly decided by the SLR, one of the rest 2 LH bands is mainly decided by the CL-SWP, and the other one is decided by the SLR and CL-SWP together.

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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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A compact metamaterial with multi-band negative-index characteristics

Cited by 21 publications

References 29 publications

A Compact Triple-Band Negative Permittivity Metamaterial for C, X-Band Applications

A Compact Triple-Band Negative Permittivity Metamaterial for C, X-Band Applications

A Novel Tunable Triple-Band Left-Handed Metamaterial

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

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