Perfect electromagnetic conductor

Perfect electromagnetic conductor DEFAULT

Vol. 73


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Field-Only Surface Integral Equations: Scattering from a Perfect Electric Conductor

PUBLICATIONS

Published

Author(s)

Qiang Sun, Evert Klaseboer, Alex Yuffa, Derek Y. Chan

Abstract

A field-only boundary integral formulation of electromagnetics is derived without the use of surface currents that appear in the Stratton--Chu formulation. For scattering by a perfect electrical conductor (PEC), the components of the electric field are obtained directly from surface integral equation solutions of three scalar Helmholtz equations for the field components. The divergence-free condition is enforced via a boundary condition on the normal component of the field and its normal derivative. Field values and their normal derivatives at the surface of the PEC are obtained directly from surface integral equations that do not contain divergent kernels. Consequently, high-order elements with fewer degrees of freedom can be used to represent surface features to a higher precision than the traditional planar elements. This theoretical framework is illustrated with numerical examples that provide further physical insight into the role of the surface curvature in scattering problems.

Citation

Journal of the Optical Society of America A

Keywords

Boundary element methods, boundary integral equations, electric field integral equation, electromagnetic propagation, electromagnetic scattering, electromagnetic theory, Helmholtz equations, magnetic field integral equation, Maxwell equations, vector wave equation

Citation

Sun, Q. , Klaseboer, E. , Yuffa, A. and Chan, D. (2020), Field-Only Surface Integral Equations: Scattering from a Perfect Electric Conductor, Journal of the Optical Society of America A, [online], https://doi.org/10.1364/JOSAA.378665, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=927222 (Accessed October 17, 2021)

Created January 31, 2020, Updated October 12, 2021

Sours: https://www.nist.gov/publications/field-only-surface-integral-equations-scattering-perfect-electric-conductor
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Minkowskian isotropic media and the perfect electromagnetic conductor

Paiva, C. R. ; Matos, S.A.

IEEE Transactions on Antennas and Propagation Vol. 60, Nº 7, pp. 3231 - 3245, July, 2012.

ISSN (print): 0018-926X
ISSN (online): 0018-926X

Journal Impact Factor: 2,181 (in 2014)

Digital Object Identifier: 10.1109/TAP.2012.2196929

Abstract

The perfect electromagnetic conductor (PEMC)
was introduced as an observer-independent “axion medium”
that generalizes the concepts of perfect electric conductor (PEC)
and perfect magnetic conductor (PMC). Following the original
boundary definition, its 3-D medium definition corresponds to a
4-D representation that is, actually, observer-dependent (i.e., it is
not isotropic for the whole class of inertial observers), leading to
a nonunique characterization of the electromagnetic field inside.
This characterization of the PEMC, then, violates the boundary
conditions—unless some extraneous waves, called “metafields,”
are surgically extracted from the final solution. In this paper,
using spacetime algebra, we define the PEMC as the unique limit
of the most general class of isotropic media in Minkowskian
spacetime, which we call Minkowskian isotropic media (MIM).
An MIM is actually a “dilaton-axion medium.” Its isotropy is a
Lorentz invariant characterization: It is an observer-independent
property, contrary to isotropy in 3-D Gibbsian characterization.
Hence, a more natural definition of a PEMC is herein presented:
It leads to a unique electromagnetic field in its interior; it corresponds,
though, to the same original boundary definition. This
new approach is applied to the analysis of an air–MIM interface
that, as a particular case, reduces to an air–PEMC interface.

Sours: https://www.it.pt/Publications/PaperJournal/6789
High Impedance Surfaces (Electromagnetic Bandgap /Artificial Magnetic Conductor)- Characteristics

Electromagnetic scattering from anisotropic plasma-coated perfect electromagnetic conductor cylinders

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A. Ghaffar, M.Z. Yaqoob, Majeed A.S. Alkanhal, M. Sharif, Q.A. Naqvi

Abstract

The scattering of electromagnetic waves by a perfect electromagnetic conductor (PEMC) cylinder coated with a homogeneous plasma anisotropic material is studied in this paper. Both of the transverse electric and the transverse magnetic polarizations of the incident waves have been analyzed and formulated. The presented analysis and formulations are general for any perfect conductor cylinder (PEC, PMC, or PEMC) with general isotropic/anisotropic material coatings that include plasma and metamaterials. The co-polarized and the cross-polarized components of the scattered fields are computed for different cases of the anisotropic plasma coated PEMC cylinders and for an anisotropic plasma column. Bistatic echo widths for the cases of PEMC, PEC (perfect electric conductor) and PMC (perfect magnetic conductor) cores have been computed and compared. The behavior of the monostatic echo width with the variation of the admittance parameter for the co-polarized and the cross polarized fields is also investigated. The comparisons of the computed results of the presented formulations with the published results of some special cases confirm the accuracy of the presented analysis.

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A. Ghaffar

  • Department of Electrical Engineering, King Saud University, Saudi Arabia
  • Department of Physics, University of Agriculture, Faisalabad, Pakistan

M.Z. Yaqoob

  • Department of Physics, Government College University, Faisalabad, Pakistan

M. Sharif

  • Department of Physics, Government College University, Faisalabad, Pakistan

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Publication languages:English

Data set:Elsevier

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Electromagnetic conductor perfect

Field-only surface integral equations: scattering from a perfect electric conductor

Author Affiliations

Qiang Sun,1,2,* Evert Klaseboer,3 Alex J. Yuffa,4 and Derek Y. C. Chan5,6

1Australian Research Council Centre of Excellence for Nanoscale BioPhotonics, RMIT University, Melbourne, VIC 3001, Australia

2Department of Chemical Engineering, The University of Melbourne, Parkville 3010, VIC, Australia

3Institute of High Performance Computing, 1 Fusionopolis Way, Singapore 138632, Singapore

4National Institute of Standards and Technology, Boulder, Colorado 80305, USA

5School of Mathematics and Statistics, The University of Melbourne, Parkville 3010, VIC, Australia

6Department of Mathematics, Swinburne University of Technology, Hawthorn, VIC 3121, Australia

*Corresponding author: [email protected]

ORCID
Sours: https://www.osapublishing.org/abstract.cfm?uri=josaa-37-2-276
Chapter 05-c Boundary Conditions for Perfect Electric Conductor

Physical optics approach to wave diffraction by a perfect electromagnetic conductor half-plane

Abstract

The scattering of electromagnetic plane waves by a perfect electromagnetic conductor is investigated. The method of physical optics is used for the analysis of the problem. The reflected fields by a whole-plane are taken into account. The surface electric and magnetic current densities are constructed with the aid of the incident wave and the reflected field from the whole-surface. The scattering integrals are obtained for the electric and magnetic vector potentials. The scattered electric and magnetic fields are expressed in terms of the vector potentials. The scattering integrals are evaluated asymptotically for large values of the wave-number. Some numerical results are given.

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Author information

Affiliations

  1. Electronic and Communication Department, Cankaya University, Eskisehir yolu 29. km, Etimesgut, Ankara, 06790, Turkey

    Yusuf Ziya Umul

Corresponding author

Correspondence to Yusuf Ziya Umul.

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Umul, Y.Z. Physical optics approach to wave diffraction by a perfect electromagnetic conductor half-plane. Opt Quant Electron53, 221 (2021). https://doi.org/10.1007/s11082-021-02877-0

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Keywords

  • Perfect electromagnetic conductor
  • Physical optics
  • Diffraction theory
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Similar news:

Perfect conductor

A perfect conductor or perfect electric conductor (PEC) is an idealized material exhibiting infinite electrical conductivity or, equivalently, zero resistivity (cf.perfect dielectric). While perfect electrical conductors do not exist in nature, the concept is a useful model when electrical resistance is negligible compared to other effects. One example is ideal magnetohydrodynamics, the study of perfectly conductive fluids. Another example is electrical circuit diagrams, which carry the implicit assumption that the wires connecting the components have no resistance. Yet another example is in computational electromagnetics, where PEC can be simulated faster, since the parts of equations that take finite conductivity into account can be neglected.

Properties of perfect conductors[edit]

Perfect conductors:

  • have exactly zero electrical resistance - a steady current within a perfect conductor will flow without losing energy to resistance. Resistance is what causes heating in conductors, thus a perfect conductor will generate no heat. Since energy is not being lost to heat, the current will not dissipate; it will flow indefinitely within the perfect conductor until there exists no potential difference.
  • require a constant magnetic flux - the magnetic flux within the perfect conductor must be constant with time. Any external field applied to a perfect conductor will have no effect on its internal field configuration.

Distinction between a perfect conductor and a superconductor[edit]

Superconductors, in addition to having no electrical resistance, exhibit quantum effects such as the Meissner effect and quantization of magnetic flux.

In perfect conductors, the interior magnetic field must remain fixed but can have a zero or nonzero value.[1] In real superconductors, all magnetic flux is expelled during the phase transition to superconductivity (the Meissner effect), and the magnetic field is always zero within the bulk of the superconductor.

Mesoscopic scale[edit]

Non-super-conducting metal can produce persistent currents when reduced to a size that is smaller than the electronic coherence length. This persistent currents has been demonstrated in noble metal rings of a few micrometers.[2][3]

References[edit]

Sours: https://en.wikipedia.org/wiki/Perfect_conductor


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