Shadow Boundary Currents in the Problem of High-Frequency Electromagnetic Diffraction by a Circular Impedance Cylinder

Andrey V. OSIPOV; Hirokazu KOBAYASHI; Kohei HONGO

Shadow Boundary Currents in the Problem of High-Frequency Electromagnetic Diffraction by a Circular Impedance Cylinder

Andrey V. OSIPOV, Hirokazu KOBAYASHI, Kohei HONGO

Full Text Views

0

Cite this

Summary :

A correction of the physical optics approximation by accounting for the presence of specific currents concentrated near shadow boundaries on the surface of a convex non-metallic scatterer is analysed by considering a canonical problem of diffraction of a plane electromagnetic wave incident normally to the axis of an infinite circular cylinder with impedance boundary conditions. The analysis focuses on the development of Fock-type asymptotic representations for magnetic field tangent components on the surface of the scatterer. The Fock-type representation of the surface field is uniformly valid within the penumbra region, providing a continuous transition from the geometrical optics formulas on the lit portion of the surface to the creeping waves approximation in the deep shadow region. A new numerical procedure for evaluating Fock-type integrals is proposed that extracts rapidly varying factors and approximates the rest, slowly varying coefficients via interpolation. This allows us to obtain accurate and simple representations for the shadow boundary currents that can be directly inserted into the radiation integral and effectively integrated. We show that accounting for the shadow boundary currents considerably improves the traditional PO analysis of the high-frequency electromagnetic fields scattered from smooth and convex non-metallic obstacles, particularly near the forward scattering direction.

Publication: IEICE TRANSACTIONS on Electronics Vol.E81-C No.10 pp.1655-1666

Publication Date: 1998/10/25

Publicized

Online ISSN

DOI

Type of Manuscript

Category: Electromagnetic Theory

Cite this

Copy

Andrey V. OSIPOV, Hirokazu KOBAYASHI, Kohei HONGO, "Shadow Boundary Currents in the Problem of High-Frequency Electromagnetic Diffraction by a Circular Impedance Cylinder" in IEICE TRANSACTIONS on Electronics, vol. E81-C, no. 10, pp. 1655-1666, October 1998, doi: .
Abstract: A correction of the physical optics approximation by accounting for the presence of specific currents concentrated near shadow boundaries on the surface of a convex non-metallic scatterer is analysed by considering a canonical problem of diffraction of a plane electromagnetic wave incident normally to the axis of an infinite circular cylinder with impedance boundary conditions. The analysis focuses on the development of Fock-type asymptotic representations for magnetic field tangent components on the surface of the scatterer. The Fock-type representation of the surface field is uniformly valid within the penumbra region, providing a continuous transition from the geometrical optics formulas on the lit portion of the surface to the creeping waves approximation in the deep shadow region. A new numerical procedure for evaluating Fock-type integrals is proposed that extracts rapidly varying factors and approximates the rest, slowly varying coefficients via interpolation. This allows us to obtain accurate and simple representations for the shadow boundary currents that can be directly inserted into the radiation integral and effectively integrated. We show that accounting for the shadow boundary currents considerably improves the traditional PO analysis of the high-frequency electromagnetic fields scattered from smooth and convex non-metallic obstacles, particularly near the forward scattering direction.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e81-c_10_1655/_p

Copy

@ARTICLE{e81-c_10_1655,
author={Andrey V. OSIPOV, Hirokazu KOBAYASHI, Kohei HONGO, },
journal={IEICE TRANSACTIONS on Electronics},
title={Shadow Boundary Currents in the Problem of High-Frequency Electromagnetic Diffraction by a Circular Impedance Cylinder},
year={1998},
volume={E81-C},
number={10},
pages={1655-1666},
abstract={A correction of the physical optics approximation by accounting for the presence of specific currents concentrated near shadow boundaries on the surface of a convex non-metallic scatterer is analysed by considering a canonical problem of diffraction of a plane electromagnetic wave incident normally to the axis of an infinite circular cylinder with impedance boundary conditions. The analysis focuses on the development of Fock-type asymptotic representations for magnetic field tangent components on the surface of the scatterer. The Fock-type representation of the surface field is uniformly valid within the penumbra region, providing a continuous transition from the geometrical optics formulas on the lit portion of the surface to the creeping waves approximation in the deep shadow region. A new numerical procedure for evaluating Fock-type integrals is proposed that extracts rapidly varying factors and approximates the rest, slowly varying coefficients via interpolation. This allows us to obtain accurate and simple representations for the shadow boundary currents that can be directly inserted into the radiation integral and effectively integrated. We show that accounting for the shadow boundary currents considerably improves the traditional PO analysis of the high-frequency electromagnetic fields scattered from smooth and convex non-metallic obstacles, particularly near the forward scattering direction.},
keywords={},
doi={},
ISSN={},
month={October},}

Copy

TY - JOUR
TI - Shadow Boundary Currents in the Problem of High-Frequency Electromagnetic Diffraction by a Circular Impedance Cylinder
T2 - IEICE TRANSACTIONS on Electronics
SP - 1655
EP - 1666
AU - Andrey V. OSIPOV
AU - Hirokazu KOBAYASHI
AU - Kohei HONGO
PY - 1998
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E81-C
IS - 10
JA - IEICE TRANSACTIONS on Electronics
Y1 - October 1998
AB - A correction of the physical optics approximation by accounting for the presence of specific currents concentrated near shadow boundaries on the surface of a convex non-metallic scatterer is analysed by considering a canonical problem of diffraction of a plane electromagnetic wave incident normally to the axis of an infinite circular cylinder with impedance boundary conditions. The analysis focuses on the development of Fock-type asymptotic representations for magnetic field tangent components on the surface of the scatterer. The Fock-type representation of the surface field is uniformly valid within the penumbra region, providing a continuous transition from the geometrical optics formulas on the lit portion of the surface to the creeping waves approximation in the deep shadow region. A new numerical procedure for evaluating Fock-type integrals is proposed that extracts rapidly varying factors and approximates the rest, slowly varying coefficients via interpolation. This allows us to obtain accurate and simple representations for the shadow boundary currents that can be directly inserted into the radiation integral and effectively integrated. We show that accounting for the shadow boundary currents considerably improves the traditional PO analysis of the high-frequency electromagnetic fields scattered from smooth and convex non-metallic obstacles, particularly near the forward scattering direction.
ER -