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Tuesday, July 28, 2020 | History

3 edition of Modeling 3-D objects with planar surfaces for prediction of electromagnetic scattering found in the catalog.

Modeling 3-D objects with planar surfaces for prediction of electromagnetic scattering

Modeling 3-D objects with planar surfaces for prediction of electromagnetic scattering

  • 282 Want to read
  • 14 Currently reading

Published by National Aeronautics and Space Administration, Langley Research Center, For sale by the National Technical Information Service in Hampton, Va, [Springfield, Va .
Written in English

    Subjects:
  • Scattering (Physics),
  • Physical optics.

  • Edition Notes

    Other titlesModeling three D objects with planar surfaces ....
    StatementM.B. Koch, F.B. Beck, and C.R. Cockrell.
    SeriesNASA technical memorandum -- 107598.
    ContributionsBeck, F. B., Cockrell, C. R., Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL18054173M

      Recent experimental studies have measured the infrared (IR) spectrum of tip-scattered near-field thermal radiation for a SiC substrate and observed up to a 50 cm − 1 redshift of the surface phonon polariton (SPhP) resonance peak,.However, the observed spectral redshift cannot be explained by the conventional near-field thermal radiation model based on the point dipole approximation. This paper addresses the subject of electromagnetic wave scattering in layered media, thus covering the recent progress achieved with different approaches. Existing theories and models are analyzed, classified, and summarized on the basis of their characteristics. Emphasis is placed on both theoretical and practical application. Finally, patterns and trends in the current literature are.

    High performance planar electromagnetic sensors, their modeling and a few applications have been reported in this paper. The researches employing planar type electromagnetic sensors have started quite a few years back with the initial emphasis on the inspection of defects on printed circuit board. Giorgio Franceschetti, Daniele Riccio, in Scattering, Natural Surfaces, and Fractals, Limits of Validity. Kirchhoff approximation holds if the surface mean radius of curvature is much greater than the electromagnetic incident wavelength. Small-slope approximation applies whenever the root-mean-square slope is much smaller than unity.

    Electromagnetic characterization of planar metamaterials by oblique angle spectroscopic measurements T. Driscoll and D. N. Basov Physics Department, University of California-San Diego, La Jolla, California , USA. Geometrical Construction of the Physical Structure. A physical structure in is typically made up of one or more geometric objects, which you either draw in its project workspace or import from an external CAD model file.. When you start the application, you land in its CubeCAD module by default. CubeCAD is a comprehensive, parametric, 3D CAD modeler along with integrated mesh.


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Modeling 3-D objects with planar surfaces for prediction of electromagnetic scattering Download PDF EPUB FB2

MODELING 3-D OBJECTS WITH PLANAR SURFACES FOR PREDICTION OF ELECTROMAGNETIC SCATTERING INTRODUCTION Many techniques exist for the solution of electromagnetic scattering problems. Solution techniques are determined by the electrical region into which the scattering object falls.

These regions are determined according to the size of the scattering object in relation to the. Electromagnetic scattering analysis of objects at resonance is difficult because low frequency techniques are slow and computer intensive, and high frequency techniques may not be reliable. A new technique for predicting the electromagnetic backscatter from electrically conducting objects at resonance is studied.

This technique is based on modeling three dimensional objects as Author: M. Koch, F. Beck, C. Cockrell. Modeling the electromagnetic scattering by 3-D objects in a layered media (U) 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) 5d. PROJECT NUMBER 5e. TASK NUMBER 5f.

WORK UNIT NUMBER 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) Defence R&D Canada -Atlantic,PO Box ,Dartmouth, NS,CA,B2Y 3Z7 8. Electromagnetic scattering by particles 15 • adds up the respective instantaneous elec- tric and magnetic field vectors: E′ = E 3 + E 4 + E 5 and HH′ =+ 34 HH+ 5; • integrates the absolute value of the vector product SE′′=× H′ (which, by its very construct, is.

Lu, C.C., Chew, W.C.: A coupled surface-volume integral equation approach for the calculation of electromagnetic scattering from composite metallic and material targets.

IEEE Trans. Antennas Propag. 48(12), – () CrossRef Google ScholarAuthor: Jiefu Chen, Shubin Zeng, Yueqin Huang. Madrazo A., Nieto-Vesperinas M. () Surface structure and polariton interactions in the scattering of electromagnetic waves from a cylinder in front of a conducting grating: theory for the reflection photon scanning tunneling microscope.

Opt. Soc. A 13, – CrossRef ADS Google Scholar. A scale changing approach is proposed for analyzing the electromagnetic scattering from discrete self-similar (e.g., log-periodic or pre-fractal) planar structures. Such structures present metallic patterns at multiple scale levels and are viewed here as the superposition of multiple domains enclosed with appropriate boundary conditions.

MODELING ELECTROMAGNETIC WAVE PROPAGATION IN ELECTRICALLY LARGE STRUCTURES by Comparison of Measured Data and SVA Model Predictions. J Approximating Arbitrary Metal Surfaces in FDTD K Far Field E-Field.

Comparison of electromagnetic field solvers for the 3D analysis of In the case of Mie scattering, i.e., scattering of a plane wave at a single sphere, MMP may use the same expansions as in the analytic solution, i.e., a multipole expansion for modeling the Imposing the continuity conditions for the electromagnetic field on the surface.

Reza, and K. Dimyati, "A novel ray-tracing, technique for indoor radio signal prediction," Journal of Electromagnetic "A new ray-tracing based wave propagation model including rough surfaces scattering and C.

Bourlier, "A geometrical optics model of three dimensional scattering from a rough surface over a planar surface. Electromagnetic modeling is essential to the design and modeling of antenna, radar, satellite, medical imaging, and other applications. In this book, author Levent Sevgi explains techniques for solving real-time complex physical problems using MATLAB-based short scripts and comprehensive virtual tools.

An electromagnetic wave scattering model based on a hybrid SPM/MoM technique has been developed for the study of the EM wave interaction of a conducting object above a rough surface. Numerical Analysis of Electromagnetic Scattering by Electrically Large Objects Using Spatial Decomposition Technique wire to be attached to the planar surface or on the bend.

modeling of. Get this from a library. Modeling 3-D objects with planar surfaces for prediction of electromagnetic scattering. [M B Koch; F B Beck; C R Cockrell; Langley Research Center.]. printable scattering elements in the late s [12], [13], as shown in Fig. The transmissive counterparts of the reflectarrays are the transmitarrays, which were used as array lens systems and date back to the s [14]–[16].

They were first implemented in the form of two interconnected planar arrays of dipole antennas, one for. 1 First-principles modeling of electromagnetic scattering by discrete and discretely heterogeneous random media Michael I.

Mishchenkoa,*, Janna M. Dlugachb, Maxim A. Yurkin c,d, Lei Bie, Brian Cairnsa, Li Liua,f, R. Lee Panettae, Larry D. Travisa, Ping Yange, Nadezhda T. Zakharova g aNASA Goddard Institute for Space Studies, Broadway, New York, NYUSA.

A model of acoustic scattering from spherical targets above a planar seafloor is established on a condition of irradiation by a point source, with both of T matrix method and complex images method.

The previously described surface wave generator is located in a 3×3×3 m 3 anechoic chamber equipped with translational and rotational stages. The emitting antenna is a high-gain pyramidal horn antenna. The receiving antenna (ridged horn antenna DRGHA ) is mounted on a rotation system thus providing a circular path in the scattering plane above the prism (Fig.

2b). The ensemble-averaged field scattered by a smooth, bounded, elastic object near a penetrable surface with small-scale random roughness is formulated. The formulation consists of combining a perturbative solution for modeling propagation through the rough surface with a transition (T-) matrix solution for scattering by the object near a planar surface.

All media bounding the rough surface are. This lumped model is also a circuit domain representation of electromagnetic interactions. It can be used to simulate circuits incorporating planar magnetics, to visualize the electromagnetic fields, and to extract parameters for magnetic models by simulations.

The modeling results match with previous theories and finite-element-modeling results. In order to calculate 3D electromagnetic scattering problems by dielectric objects which we need to solve a large‐size simultaneous linear equation, we present a rapid algorithm on the Yasuura method where we accelerate the convergence rate of solution by using an array of multipoles as well as a conventional multipole.High performance planar electromagnetic sensors, their modeling and a fewapplications have been reported in this paper.

The researches employing planar typeelectromagnetic sensors have started quite a few years back with the initial emphasis on theinspection of defects on printed circuit board.

The use of the planar type sensing system hasbeen extended for the evaluation of near-surface.Ideally, you should apply a 3-D transient electromagnetic analysis to the planar design to provide the full harmonic content, and couple this with a thermal analysis to properly predict the losses without tedious build and test iterations.