scholarly journals Extension of the Multipole Approach to Random Metamaterials

2012 ◽  
Vol 2012 ◽  
pp. 1-16 ◽  
Author(s):  
A. Chipouline ◽  
S. Sugavanam ◽  
J. Petschulat ◽  
T. Pertsch
Keyword(s):  
Short Range ◽  
Near Field ◽  
Effective Permittivity ◽  
Effective Parameters ◽  
Static Interaction ◽  
Permeability Changes ◽  
Analytical Results ◽  
Permittivity And Permeability ◽  
Random Variation

Influence of the short-range lateral disorder in the meta-atoms positioning on the effective parameters of the metamaterials is investigated theoretically using the multipole approach. Random variation of the near field quasi-static interaction between metaatoms in form of double wires is shown to be the reason for the effective permittivity and permeability changes. The obtained analytical results are compared with the known experimental ones.

Calculation of Electromagnetic Constitutive Parameters of Insulating Magnetic Materials with Conducting Inclusions

1995 ◽  
Vol 408 ◽  
Author(s):  
Drs. Eric Kuster ◽  
Rick Moore ◽  
Lisa Lust ◽  
Paul Kemper
Keyword(s):  
Magnetic Properties ◽  
Correlation Length ◽  
Method Of Moments ◽  
Effective Permittivity ◽  
Frequency Dispersion ◽  
Effective Parameters ◽  
Electromagnetic Model ◽  
Permittivity And Permeability ◽  
The Matrix ◽  
Constitutive Parameters

AbstractA Method of Moments (MoM) electromagnetic model of percolating conducting films was applied to calculate the effective parameters of the composite formed by conducting inclusions placed within a dispersive magnetic but nondispersive dielectric matrix. The MoM calculations demonstrate a coupling between the magnetic properties of the matrix and the effective composite permittivity and frequency dispersion of the composite. The coupling of permittivity and permeability is observed near the percolation threshold of the composite and for high conductivity inclusions. The prediction agrees with physical expectations since near percolation the conduction correlation length dominates the effective permittivity of the composite and this correlation length is determined by both the permittivity and permeability of the composite.

Effective parameters of a metamaterial composed of dielectric coated conducting cylindrical rods

2020 ◽  
Vol 12 (8) ◽  
pp. 797-808
Author(s):  
Z. A. Awan ◽  
Hassan Ullah ◽  
Ahsan Ullah ◽  
Afshan Ashraf
Keyword(s):  
Gallium Arsenide ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Effective Permittivity ◽  
Double Negative ◽  
Two Dimensional ◽  
Effective Parameters ◽  
Barium Strontium ◽  
Electric Conducting ◽  
Permittivity And Permeability

AbstractIn the first part, the scattering characteristics of an isolated dielectric coated conducting rod have been investigated. The types of considered coatings for the scattering analysis are realistic materials including barium strontium titanate, magnetodielectric, gallium arsenide, and silicon carbide. It is found that the gallium arsenide coating can be used to significantly reduce the scattering from a thin perfectly electric conducting cylindrical rod at specific observation angles. In the second part, the effective permittivity and permeability of metamaterials composed of two dimensional periodic arrangements of these dielectric coated conducting cylindrical rods have been studied. An increase in the double negative (DNG) bandwidth of a metamaterial composed of barium strontium titanate coated conducting rods has been observed in contrast to the corresponding bandwidth of a metamaterial composed of only barium strontium titanate material rods. Also an additional plasmonic epsilon negative (ENG) bandwidth has been found in case of a metamaterial composed of barium strontium titanate coated conducting rods. It is further studied that the widest ENG, mu negative, and DNG bandwidths exist for a metamaterial composed of gallium arsenide rods.

IMPACT OF GEOMETRICAL PARAMETERS ON TRANSMISSION PROPERTIES OF CUT-WIRE PAIR STRUCTURES

2009 ◽  
Vol 18 (03) ◽  
pp. 489-499 ◽  
Author(s):  
N. T. TUNG ◽  
Y. P. LEE ◽  
T. X. HOAI ◽  
V. D. LAM
Keyword(s):  
Transfer Matrix Method ◽  
Matrix Method ◽  
Effective Permittivity ◽  
Geometrical Parameters ◽  
Scattering Parameters ◽  
Integration Technique ◽  
Transmission Properties ◽  
Resonance Frequencies ◽  
Permittivity And Permeability ◽  
Magnetic Resonances

We investigate the transmission properties of a metamagnetic structure, the so-called cut-wire pair (CWP), using the transfer-matrix method and the finite integration technique. The electric and magnetic resonances of the CWP structure are demonstrated by the effective medium analyses. The corresponding effective permittivity and permeability are calculated from the complex scattering parameters using the standard retrieval procedure. Importantly, the dependence of transmission properties and resonance frequencies on the periodicities as well as the shape of CWP are systematically examined.

Communication Trends in Internet of Things

2018 ◽  
pp. 284-305 ◽  
Author(s):  
Bharathi N. Gopalsamy
Keyword(s):  
Internet Of Things ◽  
Short Range ◽  
Near Field ◽  
Communication Technologies ◽  
Good Choice ◽  
Battery Life ◽  
Power Requirement ◽  
Storage Security ◽  
Central Hypothesis ◽  
Iot Devices

The central hypothesis of Internet of Things is the term “connectivity”. The IoT devices are connected to the Internet through a wide variety of communication technologies. This chapter explains the various technologies involved in IoT connectivity. The diversity in communication raises the query of which one to choose for the proposed application. The key objective of the application needs to be defined very clearly. The application features such as the power requirement, data size, storage, security and battery life highly influence the decision of selecting one or more communication technology. Near Field Communication is a good choice for short-range communication, whereas Wi-Fi can be opted for a larger range of coverage. Though Bluetooth is required for higher data rate, it is power hungry, but ZigBee is suitable for low power devices. There involves always the tradeoff between the technologies and the requirements. This chapter emphasizes that the goal of the application required to be more precise to decide the winner of the IoT connectivity technology that suits for it.

scholarly journals Near-Field Short Range Correlation in Optical Waves Transmitted through Random Media

2003 ◽  
Vol 90 (25) ◽  
Author(s):  
V. Emiliani ◽  
F. Intonti ◽  
M. Cazayous ◽  
D. S. Wiersma ◽  
M. Colocci ◽  
...  
Keyword(s):  
Short Range ◽  
Random Media ◽  
Near Field ◽  
Short Range Correlation ◽  
Optical Waves ◽  
Range Correlation

Effective Permittivity and Permeability of a Fibers Grating

1994 ◽  
Vol 14 (2) ◽  
pp. 137-151 ◽  
Author(s):  
S. I. Pereverzev ◽  
P. Y. Ufimtsev
Keyword(s):  
Effective Permittivity ◽  
Permittivity And Permeability

scholarly journals 3D-Simulation of Topology-Induced Changes of Effective Permeability and Permittivity in Composite Materials

2007 ◽  
Vol 2007 ◽  
pp. 1-8 ◽  
Author(s):  
B. Hallouet ◽  
R. Pelster
Keyword(s):  
Composite Materials ◽  
Effective Permeability ◽  
Filling Factor ◽  
Effective Permittivity ◽  
Matrix Material ◽  
Systematic Difference ◽  
Material Parameters ◽  
Effective Medium Model ◽  
Permittivity And Permeability ◽  
Induced Changes

We have performed 3D simulations of complex effective permittivity and permeability for random binary mixtures of cubic particles below the percolation threshold. We compare two topological classes that correspond to different spatial particle arrangements: cermet topology and aggregate topology. At a low filling factor off=10%, where most particles are surrounded by matrix material, the respective effective material parameters are indistinguishable. At higher concentrations, a systematic difference emerges: cermet topology is characterized by lower effective permittivity and permeability values. A distinction between topological classes might thus be a useful concept for the analysis of real systems, especially in cases where no exact effective-medium model is available.

scholarly journals Effective electrodynamical parameters and microwave heating of radially heterogeneous pellets containing EAF dust and biochar

2021 ◽  
Vol 2015 (1) ◽  
pp. 012007
Author(s):  
Anton P Anzulevich ◽  
Leonid N Butko ◽  
Dmitry A Pavlov ◽  
Dmitry A Kalganov ◽  
Valentin A Tolkachev ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Temperature Distribution ◽  
Volume Fraction ◽  
Effective Permittivity ◽  
Electric Arc ◽  
Arc Furnace ◽  
Eaf Dust ◽  
Permittivity And Permeability ◽  
Composite Mixture ◽  
Effective Medium Approach

Abstract In this work, we investigated the effect of microwave radiation with radially heterogeneous pellets consisting of electric arc furnace (EAF) dust and biochar. We reviewed the possible content of EAF dust in terms of permittivity and permeability of its components and calculated effective permittivity and permeability of EAF dust by an effective medium approach. Using obtained values we calculated dependencies of effective permittivity and permeability of EAF dust - biochar composite mixture on the volume fraction of EAF dust and conductivity of biochar. Taking into account these dependencies we simulated electromagnetic field and temperature distribution within pellet with a radial dependency of volume fraction of EAF dust and effective permittivity correspondingly.

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