Errors of Physical Optics in Shadow Region--Fictitious Penetrating Rays--
Summary :
Physical optics (PO) is an approximation method for high-frequency scattering and diffraction problems. But PO fields are inaccurate in the shadow region where the source is screened by the scatterer. It has been difficult to extract the mechanism of this error because PO includes numerical integration. In 2-D problems, PO fields are analytically and accurately expressed in terms of PO equivalent edge currents (PO-EECs) which represent the leading contributions of PO original integration. Comparison of PO in this form and geometrical theory of diffraction (GTD) which gives accurate fields in the shadow region, clarifies the cause of PO errors. For a scatterer with a corner, PO errors are mainly due to the rays emanating from the invisible edges. For a curved surface scatterer, the contributions penetrating the scatterer are small and main PO errors generally consist in PO-EECs itself.
- Publication
- IEICE TRANSACTIONS on Electronics Vol.E77-C No.6 pp.995-1004
- Publication Date
- 1994/06/25
- Publicized
- Online ISSN
- DOI
- Type of Manuscript
- PAPER
- Category
- Electromagnetic Theory
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Masayuki OODO, Tsutomu MURASAKI, Makoto ANDO, "Errors of Physical Optics in Shadow Region--Fictitious Penetrating Rays--" in IEICE TRANSACTIONS on Electronics,
vol. E77-C, no. 6, pp. 995-1004, June 1994, doi: .
Abstract: Physical optics (PO) is an approximation method for high-frequency scattering and diffraction problems. But PO fields are inaccurate in the shadow region where the source is screened by the scatterer. It has been difficult to extract the mechanism of this error because PO includes numerical integration. In 2-D problems, PO fields are analytically and accurately expressed in terms of PO equivalent edge currents (PO-EECs) which represent the leading contributions of PO original integration. Comparison of PO in this form and geometrical theory of diffraction (GTD) which gives accurate fields in the shadow region, clarifies the cause of PO errors. For a scatterer with a corner, PO errors are mainly due to the rays emanating from the invisible edges. For a curved surface scatterer, the contributions penetrating the scatterer are small and main PO errors generally consist in PO-EECs itself.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e77-c_6_995/_p
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@ARTICLE{e77-c_6_995,
author={Masayuki OODO, Tsutomu MURASAKI, Makoto ANDO, },
journal={IEICE TRANSACTIONS on Electronics},
title={Errors of Physical Optics in Shadow Region--Fictitious Penetrating Rays--},
year={1994},
volume={E77-C},
number={6},
pages={995-1004},
abstract={Physical optics (PO) is an approximation method for high-frequency scattering and diffraction problems. But PO fields are inaccurate in the shadow region where the source is screened by the scatterer. It has been difficult to extract the mechanism of this error because PO includes numerical integration. In 2-D problems, PO fields are analytically and accurately expressed in terms of PO equivalent edge currents (PO-EECs) which represent the leading contributions of PO original integration. Comparison of PO in this form and geometrical theory of diffraction (GTD) which gives accurate fields in the shadow region, clarifies the cause of PO errors. For a scatterer with a corner, PO errors are mainly due to the rays emanating from the invisible edges. For a curved surface scatterer, the contributions penetrating the scatterer are small and main PO errors generally consist in PO-EECs itself.},
keywords={},
doi={},
ISSN={},
month={June},}
Copy
TY - JOUR
TI - Errors of Physical Optics in Shadow Region--Fictitious Penetrating Rays--
T2 - IEICE TRANSACTIONS on Electronics
SP - 995
EP - 1004
AU - Masayuki OODO
AU - Tsutomu MURASAKI
AU - Makoto ANDO
PY - 1994
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E77-C
IS - 6
JA - IEICE TRANSACTIONS on Electronics
Y1 - June 1994
AB - Physical optics (PO) is an approximation method for high-frequency scattering and diffraction problems. But PO fields are inaccurate in the shadow region where the source is screened by the scatterer. It has been difficult to extract the mechanism of this error because PO includes numerical integration. In 2-D problems, PO fields are analytically and accurately expressed in terms of PO equivalent edge currents (PO-EECs) which represent the leading contributions of PO original integration. Comparison of PO in this form and geometrical theory of diffraction (GTD) which gives accurate fields in the shadow region, clarifies the cause of PO errors. For a scatterer with a corner, PO errors are mainly due to the rays emanating from the invisible edges. For a curved surface scatterer, the contributions penetrating the scatterer are small and main PO errors generally consist in PO-EECs itself.
ER -
English
