scholarly journals Electromagnetic waves in double negative metamaterials and study on numerical resonances in the method of moments (MoM)

2008 ◽  
Author(s):  
Weiwei Shu
Keyword(s):  
Method Of Moments ◽  
Electromagnetic Waves ◽  
Double Negative

scholarly journals Analysis on the Influence of the Height of Tower on Passive Interference in shortwave

2018 ◽  
Vol 64 ◽  
pp. 05005
Author(s):  
Ying Lu ◽  
Zhibin Zhao ◽  
Jian gong Zhang ◽  
Zheyuan Gan
Keyword(s):  
Transmission Line ◽  
Method Of Moments ◽  
Transmission Lines ◽  
Electromagnetic Scattering ◽  
Electromagnetic Waves ◽  
Short Wave ◽  
Radio Station ◽  
Radio Stations ◽  
Working Frequency ◽  
Passive Interference

The passive interference of transmission lines to nearby radio stations may affect the effective reception and transmission of radio station signals. Therefore, the accurate calculation of the electromagnetic scattering of transmission lines under the condition of external electromagnetic waves is the basis for determining the reasonable avoidance spacing of the two. For passive stations operating in short-wave frequencies, passive interference is mainly generated by the tower. This paper uses the method of moments to perform passive interference calculations under normal circumstances, And elaborates the method for calculating the electromagnetic field of the transmission line, obtains the space electric field intensity of the transmission line at the same working frequency and space location of the plane wave. Uses the approximate formula to inductive the formula for calculating height of tower and the protective distance.

scholarly journals Application of the Shifted Frequency Internal Equivalence to Two Dimensional Lossy Objects

2019 ◽  
Vol 8 (2) ◽  
pp. 126-133
Author(s):  
B. Aydemir ◽  
A. Köksal
Keyword(s):  
Method Of Moments ◽  
Electromagnetic Waves ◽  
Skin Effect ◽  
Scattering Problem ◽  
New Method ◽  
Two Dimensional ◽  
Electrical Permittivity ◽  
Conductivity Loss ◽  
Conductive Media

Performance of a new method, Shifted Frequency Internal Equivalence (SFIE) is studied in the analysis of scattering from two dimensional lossy objects. This method finds the solution of a wideband scattering problem faster than classical approaches.By introducing conductivity, loss shows itself as imaginary electrical permittivity. Changing conductivity also changes the distribution of electromagnetic waves and modifies RCS plots. In this study homogeneous and inhomogeneous conductive media are investigated to widen the usage of SFIE method. By increasing conductivity skin effect phenomenon is observed, electrical dimensions are decreased and RCS plots are flattened as expected.Numerical results obtained by SFIE are compared to the ones obtained by Method of Moments and the differences are shown.

Negative refraction of plane electromagnetic waves in non-uniform double-negative media

2019 ◽  
Vol 44 (5) ◽  
pp. 1125 ◽  
Author(s):  
L. A. Pazynin ◽  
V. L. Pazynin ◽  
H. O. Sliusarenko
Keyword(s):  
Electromagnetic Waves ◽  
Negative Refraction ◽  
Double Negative

Dielectric Properties of Various Ranks of Coal and Numerical Modeling Under Electromagnetic Irradiation

1990 ◽  
Vol 189 ◽  
Author(s):  
I. Chatterjee ◽  
M. Misra
Keyword(s):  
Dielectric Properties ◽  
Method Of Moments ◽  
Electromagnetic Waves ◽  
Numerical Technique ◽  
Free Water ◽  
Microwave Drying ◽  
Network Analyzer ◽  
Frequency Range ◽  
Absorbed Energy ◽  
Finite Difference Technique

ABSTRACTThe dielectric properties of different ranks of Argonne Premium coal samples have been measured using an automated network analyzer system in the frequency range 0.3MHz to 3GHz. These measurements indicate that the inherent moisture present in the various ranks ofcoal has dielectric properties which are different from that of free water. The dielectric properties were also observed to increase with the moisture content as well as with the amount of oxygen present in the coal sample. A mixture model was successfully used topredict these dielectric properties.The measured dielectric properties have been incorporated into numerical calculations ofthe distribution of absorbed energy in coal irradiated with electromagnetic waves. The numerical technique used is the Method of Moments. Subsequently, the temperature distribution obtained in the coal is evaluated using a Finite Difference technique to solve the heat conduction equation. These calculations should prove very useful in the microwave drying of coal where it is difficult to monitor the temperature using probes.

Buried object approach for solving scattering problems related to rough surfaces

2007 ◽  
Vol 85 (1) ◽  
pp. 39-55 ◽  
Author(s):  
Yasemin Altuncu ◽  
Ali Yapar ◽  
Ibrahim Akduman
Keyword(s):  
Method Of Moments ◽  
Electromagnetic Waves ◽  
Scattered Wave ◽  
Arbitrary Cross Section ◽  
Planar Interface ◽  
Present Formulation ◽  
Planar Boundary ◽  
Rough Interface ◽  
Scattering Problems ◽  
Buried Object

A new method for the scattering of electromagnetic waves from a locally rough interface between two dielectric half-spaces is addressed. The method is based on the assumption that the perturbations of the rough surface from the planar interface are objects buried in a two-half spaces media with a planar boundary, which allows one to reduce the problem to the scattering of electromagnetic waves by cylindrical bodies of arbitrary cross section. Then through the Green's function of the background medium one obtains a Fredholm integral equation of the second kind, which is solved via an application of the Method of Moments. The present formulation permits one to get the near and far field expressions of the scattered wave. The method is effective for surfaces having a local roughness and arbitrary root mean square heights but does not work in the case of a highly conductive background medium.PACS Nos.: 41.20.–q, 41.20.Jb, 03.50.De

LINEAR ELECTRO-OPTICAL EFFECT ON DPS-DNG LAYERED STRUCTURE

2009 ◽  
Vol 23 (15) ◽  
pp. 3205-3211 ◽  
Author(s):  
J. H. SHAHBAZIAN ◽  
A. S. KARAKASHIAN
Keyword(s):  
Electric Field ◽  
Layered Structure ◽  
Electromagnetic Waves ◽  
Index Of Refraction ◽  
Double Negative ◽  
Reflection Spectra ◽  
Optical Effect ◽  
Double Positive ◽  
Negative Index Of Refraction ◽  
Positive Index

In this letter, the influence of an applied electric field on a periodic structure composed of alternating layers of DPS (Double Positive index of refraction) and DNG (Double Negative index of refraction) has been studied. We present theoretical and numerical results of our investigation of the reflection spectra of the visible waves on this structure in the presence of an electric field which will cause redistribution of charges and will modify the index of refraction of materials and enable us to control the phase and/or intensity of propagating electromagnetic waves.

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