Compact ‘V’ shaped metamaterial based resonator for wide band rejection
01 Mar 2017-pp 88-91
TL;DR: In this article, the authors proposed a new technique to achieve a wideband rejection between 5.15 GHz to 5.85 GHz using a compact metamaterial structure, which achieved a fractional bandwidth of 13.17% within nominal space.
Abstract: This paper represents a new technique to achieve a wideband rejection between 5.15 GHz to 5.85 GHz using a compact metamaterial structure. Metamaterials are narrowband resonator, which has bandwidth of 3% approx., but under this paper the novelty lies in incorporating a ‘V’ shaped metamaterial structure to achieve a fractional bandwidth of 13.17% within nominal space. Single ‘V’ shaped resonator has been simulated in full wave simulator and substantiated for permeability (μ), permittivity (□) and refractive index (n) values using Matlab code. The order of the resonator is increased upto 4 to achieve better rejection bandwidth and rejection level. The resonator and its complementary have been simulated along with a transmission line. The simulation result shows that the proposed 4th order ‘V’ shaped complementary resonator has better response and provides a wideband rejection from 5.15–5.85 GHz (WLAN Band) below −10dB for a dimension of 9×9 mm2.
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TL;DR: In this paper, a unit cell metamaterial structure is proposed, which consists of four compact bend triangular resonators (CBTRs) that offer wideband frequency rejection for the WLAN 5 GHz band.
Abstract: The current wireless technology demands wide frequency operation, like WLAN 5 GHz band, which requires 12.75% frequency bandwidth. In this paper, a unit cell metamaterial structure is proposed, which consists of 4 compact bend triangular resonators (CBTRs) that offer wideband frequency rejection. The single negative metamaterial based resonators give band rejection response, but it is generally bandwidth limited. With the proposed unit cell, rejection bandwidth of 16.78% for rejection level of −12 dB is achieved. It can be further increased by increasing the order of unit cells. The proposed unit cell structure is analyzed for the resonant frequency of 5.5 GHz, and the design is suitable for the application where 15% or more rejection band is required.
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10,495 citations
TL;DR: These experiments directly confirm the predictions of Maxwell's equations that n is given by the negative square root ofɛ·μ for the frequencies where both the permittivity and the permeability are negative.
Abstract: We present experimental scattering data at microwave frequencies on a structured metamaterial that exhibits a frequency band where the effective index of refraction (n) is negative. The material consists of a two-dimensional array of repeated unit cells of copper strips and split ring resonators on interlocking strips of standard circuit board material. By measuring the scattering angle of the transmitted beam through a prism fabricated from this material, we determine the effective n, appropriate to Snell's law. These experiments directly confirm the predictions of Maxwell's equations that n is given by the negative square root of epsilon.mu for the frequencies where both the permittivity (epsilon) and the permeability (mu) are negative. Configurations of geometrical optical designs are now possible that could not be realized by positive index materials.
8,477 citations
"Compact ‘V’ shaped metamaterial bas..." refers background in this paper
...Metamaterials are also called left-handed materials (LHMs) because they exhibits negative values of permittivity and permeability which is not found in nature [1]-[3]....
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TL;DR: A composite medium, based on a periodic array of interspaced conducting nonmagnetic split ring resonators and continuous wires, that exhibits a frequency region in the microwave regime with simultaneously negative values of effective permeability and permittivity varepsilon(eff)(omega).
Abstract: We demonstrate a composite medium, based on a periodic array of interspaced conducting nonmagnetic split ring resonators and continuous wires, that exhibits a frequency region in the microwave regime with
8,057 citations
TL;DR: In this article, an improved method to retrieve the effective constitutive parameters (permittivity and permeability) of a slab of metamaterial from the measurement of S parameters is proposed.
Abstract: We propose an improved method to retrieve the effective constitutive parameters (permittivity and permeability) of a slab of metamaterial from the measurement of S parameters. Improvements over existing methods include the determination of the first boundary and the thickness of the effective slab, the selection of the correct sign of effective impedance, and a mathematical method to choose the correct branch of the real part of the refractive index. The sensitivity of the effective constitutive parameters to the accuracy of the S parameters is also discussed. The method has been applied to various metamaterials and the successful retrieval results prove its effectiveness and robustness.
1,941 citations
TL;DR: The regime of negative index, made relevant by a recent demonstration of an effective LHM, leads to unusual electromagnetic wave propagation and merits further exploration.
Abstract: The real part of the refractive index $n(\ensuremath{\omega})$ of a nearly transparent and passive medium is usually taken to have only positive values. Through an analysis of a current source radiating into a 1D ``left-handed'' material (LHM)---where the permittivity and permeability are simultaneously less than zero---we determine the analytic structure of $n(\ensuremath{\omega})$, demonstrating frequency regions where the sign of $\mathrm{Re}[n(\ensuremath{\omega})]$ must, in fact, be negative. The regime of negative index, made relevant by a recent demonstration of an effective LHM, leads to unusual electromagnetic wave propagation and merits further exploration.
1,068 citations