Electromagnetic characterization of chiral auxetic metamaterials for EMC applications

Ciobanu, Romeo-Cristian; Damian, Radu-Florin; Botez, Irinel Casian

doi:10.1016/j.csi.2009.11.004

Cited by 11 publications

(4 citation statements)

References 13 publications

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“…Several models have been proposed to explain auxeticity, including the well known mechanism involving flexure or hinging of re-entrant honeycombs [9], or the relative rotation of rigid or semi-rigid units [5,[10][11][12][13][14][15][16][17], such as the rotating rigid squares model [5] and the rotating rigid triangles model [16,17]. Whilst it is known that auxetic behaviour may contribute to an enhancement of the electromagnetic properties [18][19][20], work on auxetics systems which have magnetic insertions is still in its infancy [21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Smart metamaterials with tunable auxetic and other properties

Grima

Caruana‐Gauci

Dudek

et al. 2013

Smart Mater. Struct.

138

100

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Auxetic and other mechanical metamaterials are typically studied in situations where they are subjected solely to mechanical forces or displacements even though they may be designed to exhibit additional anomalous behaviour or tunability when subjected to other disturbances such as changes in temperature or magnetic fields. It is shown that externally applied magnetic fields can tune the geometry and macroscopic properties of known auxetics that incorporate magnetic component/s, thus resulting in a change of their macroscopic properties. Anomalous properties which are observed in such novel magneto-mechanical systems include tunable Poisson's ratios, bi-stability or multi-stability, depending on the applied magnetic fields, and other electromagnetic-mechanical effects such as strain dependent induced electric currents and magnetic fields. The properties exhibited depend, amongst other things, on the relative position and orientation of the magnetic insertion/s within the structure, the geometry of the system and the magnetic strength of the magnetic components, including that of the external magnetic field.

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Section: Introductionmentioning

confidence: 99%

Smart metamaterials with tunable auxetic and other properties

Grima

Caruana‐Gauci

Dudek

et al. 2013

Smart Mater. Struct.

138

100

View full text Add to dashboard Cite

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“…A dispersive model (second order) was used for the LDPE matrix and the standard (CST library) models for the metallic fillers. The boundary conditions were set to electric wall (x direction walls) and magnetic wall (y direction walls) in order to force the plane wave symmetry for the fields inside the structure [ 25 ]. Two Visual Basic (VBA) scripts were used to compute (Equation (8)) the required dimensions of the LDPE matrix and then to create random (position and size) rectangular particles inside, the final structure being similar to those in Figure 5 .…”

Section: Comparative Resultsmentioning

confidence: 99%

Simulation of Dielectric Properties of Nanocomposites with Non-Uniform Filler Distribution

et al. 2023

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Dielectric properties for nanocomposites with metallic fillers inside a polymer matrix were determined using CST STUDIO SUITE—Electromagnetic field simulation software followed by the free-space Nicolson–Ross–Weir procedure. The structure is randomly generated to simulate the intrinsic non-uniformity of real nanomaterials. Cubic insertions were equated to corresponding spherical particles in order to provide either the same volume index or the same exterior surface index. The energy concentration around the inserts and within the entire material was determined as useful information in practice in order to design materials tailored to avoid exceeding the field/temperature limit values. The paper successfully associated the dialectic measurements with the results from the computer simulations, which are mainly based on energetic effects in electromagnetic applications. The experimental results are comparable with the software simulation in terms of precision. The conclusions outline the practical applications of the method for both electromagnetic shielding and microwave domain/telecommunications applications.

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“…Origami-based structures have been previously suggested as a solution to create deployable continuous-state tuneable FSSs, in which an origami pattern enables the change in the overall shape of the structure that provides the desired reconfigurability 24 – 26 ; yet, the out-of-plane deformation of origami structures makes their application difficult in compactly constructed planar components. Planar auxetic structures with buckling-induced elements have been also proposed for electromagnetic compatibility applications 27 , 28 . These kinematic mechanisms usually have continuous small deformation; therefore, they need precise control to deploy to the specific configurations that provide the desired variable frequency response.…”

Section: Introductionmentioning

confidence: 99%

A new class of transformable kirigami metamaterials for reconfigurable electromagnetic systems

Yang

Vallecchi

Shamonina

et al. 2023

Sci Rep

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The rapid development of radio frequency (RF) components requires smart multifunctional materials that can adapt their physical shapes and properties according to the environment. While most current reconfigurable systems provide limited flexibility with high manufacturing cost, this research proposes to harness the transformable properties of kirigami-inspired multistable mechanical metasurfaces that can repeatedly deform and lock into different configurations to realize a novel class of low-cost reconfigurable electromagnetic structures with a broad design space. The metasurfaces are formed by designing kinematic-based unit cells with metallised coating that can provide adjustable resonant electromagnetic (EM) properties while rotating with respect to each other. Tailoring the cut length and geometry parameters of the patterns, we demonstrate programming of the topologies and shapes of different configurations. The influence of critical parameters on the structural multistability is illustrated by means of both a simplified energy model and finite element simulations. As examples of the reconfigurable electromagnetic devices that can be realized, we report the development of a tuneable half-wave dipole and two frequency selective surface (FSS) designs featuring isotropic and anisotropic responses. While the kirigami dipole can be tuned by mechanically stretching its arms, the FSSs exhibit distinct transmittance and reflectance spectra in each of the kirigami patterns stable states. The functionality of these kirigami devices is validated both by full-wave EM simulations and experiments. The proposed transformable structures can be mechanically actuated to tune the EM response in frequency or induce anisotropies for wave propagation.

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Electromagnetic characterization of chiral auxetic metamaterials for EMC applications

Cited by 11 publications

References 13 publications

Smart metamaterials with tunable auxetic and other properties

Smart metamaterials with tunable auxetic and other properties

Simulation of Dielectric Properties of Nanocomposites with Non-Uniform Filler Distribution

A new class of transformable kirigami metamaterials for reconfigurable electromagnetic systems

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