scholarly journals GAUSSIAN BEAM ELECTROMAGNETIC SCATTERING FROM PEC POLYGONAL CROSS-SECTION CYLINDERS

2017 ◽  
Vol 79 ◽  
pp. 101-113
Author(s):  
Mario Lucido ◽  
Fulvio Schettino ◽  
Marco Donald Migliore ◽  
Daniele Pinchera ◽  
Gaetano Panariello
Keyword(s):  
Gaussian Beam ◽  
Cross Section ◽  
Electromagnetic Scattering

Decomposing the Non-Gaussian Surface in Sum of Gaussian Surfaces

2012 ◽  
Vol 580 ◽  
pp. 170-174
Author(s):  
Zhang Xing Qi ◽  
Zhen Sen Wu ◽  
Zi Wen Yu ◽  
Hai Ying Li
Keyword(s):  
Cross Section ◽  
Electromagnetic Scattering ◽  
Radar Cross Section ◽  
Kirchhoff Approximation ◽  
Munk Function ◽  
The Difference ◽  
Non Gaussian ◽  
Gaussian Surface

The decomposition of the multivariate Non-Gaussian PDF in the sum of a Gaussian PDF instead of the Gram-Charlier series is investigated. Four parameters need to be found by minimizing the integrated square of the difference between Cox-Munk function and its approximation. The backscattering radar cross section (RCS) of the surface is calculated by the Kirchhoff approximation (KA) under different value of k using the formula of decomposition of the Non-Gaussian. The condition of KA satisfying electromagnetic scattering scale from Gaussian and Non-Gaussian surfaces is taken into account by computing the backscattering coefficients in HH and VV polarity.

Gravitational Möller scattering, Lorentz violation and finite temperature

2020 ◽  
Vol 35 (26) ◽  
pp. 2050213
Author(s):  
A. F. Santos ◽  
Faqir C. Khanna
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Electromagnetic Scattering ◽  
Lorentz Violation ◽  
Gravitational Effect ◽  
Energy Scale ◽  
Minimal Coupling ◽  
Moller Scattering ◽  
Thermo Field Dynamics

A formal analogy between the gravitational and the electromagnetic fields leads to the notion of Gravitoelectromagnetism (GEM) to describe gravitation. A Lagrangian formulation for GEM is developed for scattering processes with gravitons as an intermediate state, in addition to photons for electromagnetic scattering. The differential cross section is calculated for gravitational Möller scattering based on GEM theory. This gravitational cross section is obtained for cases where the Lorentz symmetry is maintained or violated. The Lorentz violation is introduced with the non-minimal coupling term. In addition, using the Thermo Field Dynamics formalism, thermal corrections to the differential cross section are investigated. By comparing the electromagnetic and GEM versions, of Möller scattering, it is shown that the gravitational effect may be measured at an appropriate energy scale.

scholarly journals TM Electromagnetic Scattering from PEC Polygonal Cross-Section Cylinders: A New Analytical Approach for the Efficient Evaluation of Improper Integrals Involving Oscillating and Slowly Decaying Functions

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Mario Lucido ◽  
Chiara Santomassimo ◽  
Fulvio Schettino ◽  
Marco Donald Migliore ◽  
Daniele Pinchera ◽  
...  
Keyword(s):  
Cross Section ◽  
Electromagnetic Scattering ◽  
Computation Time ◽  
Electric Field Integral Equation ◽  
Analytical Technique ◽  
Electrically Conducting ◽  
Acceleration Technique ◽  
Integral Equation Formulation ◽  
The Matrix ◽  
Improper Integrals

The analysis of the TM electromagnetic scattering from perfectly electrically conducting polygonal cross-section cylinders is successfully carried out by means of an electric field integral equation formulation in the spectral domain and the method of analytical preconditioning which leads to a matrix equation at which Fredholm’s theory can be applied. Hence, the convergence of the discretization scheme is guaranteed. Unfortunately, the matrix coefficients are improper integrals involving oscillating and, in the worst cases, slowly decaying functions. Moreover, the classical analytical asymptotic acceleration technique leads to faster decaying integrands without overcoming the most important problem of their oscillating nature. Thus, the computation time rapidly increases as higher is the accuracy required for the solution. The aim of this paper is to show a new analytical technique for the efficient evaluation of such kind of integrals even when high accuracy is required for the solution.

Influence of Gaussian Beam on Terahertz Radar Cross Section of a Conducting Sphere

2012 ◽  
Vol 34 (1) ◽  
pp. 88-96 ◽  
Author(s):  
Hui-Yu Li ◽  
Qi Li ◽  
Zhi-Wei Xia ◽  
Yong-Peng Zhao ◽  
De-Ying Chen ◽  
...  
Keyword(s):  
Gaussian Beam ◽  
Cross Section ◽  
Radar Cross Section ◽  
Conducting Sphere

Electromagnetic Scattering by a Moving Conducting Cylinder of Arbitrary Cross Section

1973 ◽  
Vol 51 (22) ◽  
pp. 2389-2394 ◽  
Author(s):  
J. D. Hunter
Keyword(s):  
Cross Section ◽  
Electromagnetic Scattering ◽  
Incident Field ◽  
Arbitrary Cross Section ◽  
Square Cylinder ◽  
Field Source ◽  
Conducting Cylinder ◽  
Arbitrary Velocity

A method is derived for calculating the electromagnetic scattering from a conducting cylinder of arbitrary cross section moving with arbitrary velocity relative to the field source and the observer. Results are presented for a moving square cylinder for both TM and TE polarizations of the incident field.

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