An exact line integral representation of the physical optics scattered field: the case of a perfectly conducting polyhedral structure illuminated by electric Hertzian dipoles

Johansen, Per Michael; Breinbjerg, Olav

doi:10.1109/8.391140

Cited by 52 publications

(35 citation statements)

References 14 publications

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“…The electric field radiated by the lateral surface is given by (6) where is the distance between the integration point along the strip and the observation point . Equation (6) is valid for arbitrary observation points except those lying on the surface .…”

Section: Line-integral Formulation For Uniform Aperture Distribumentioning

confidence: 99%

“…A modern applicationoriented reformulation of the surface-to-line integral reduction is due to Asvestas [5]; his technique was generalized in [6] to PO scattering from a perfectly conducting flat face. The procedure presented here while specializing with a simplified formulation the work presented in [4] to the case of reflector antennas, leads to an interesting generalization to nonuniform aperture fields.…”

Section: Introductionmentioning

confidence: 99%

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Near-field line-integral representation of the Kirchhoff-type aperture radiation for a parabolic reflector

Infante

Maci

2003

Antennas Wirel. Propag. Lett.

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In this letter, a line integral representation is presented for a linearly polarized Kirchhoff-type aperture radiation from a parabolic reflector antenna. The main purpose of this result is concerned with the acceleration of the numerical integration for calculating the near field of large reflector antennas. The formulation, which is rigorous for uniform aperture field, is based on the application of the equivalence principle to a projecting surface, which allows the analytical evaluation in a closed form of one of the twofold surface integral which defines the radiated field at any space point; the extension to slowly varying primary feed pattern is based on an asymptotic approximation, which is proved to be accurate in proximity of the aperture till to 30 dB of amplitude edge illumination. The present formulation is well suited to be improved by fringe diffraction contributions in the framework of edge-wave theories such as physical theory of diffraction (PTD) and incremental theory of diffraction (ITD).

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Section: Line-integral Formulation For Uniform Aperture Distribumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Near-field line-integral representation of the Kirchhoff-type aperture radiation for a parabolic reflector

Infante

Maci

2003

Antennas Wirel. Propag. Lett.

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“…But for slow moving and stationary objects the facet shapes are superior due to their unique scattering properties and technological manufacturing simplicity. That is why polygonal plates and [133]- [150], [154]. Of course, such objects contain corners and edges which create cornerdiffracted and edge-diffracted rays.…”

Section: Reduction Of Monostatic Rcs By Body Shapingmentioning

confidence: 99%

Comments on diffraction principles and limitations of RCS reduction techniques

Ufimtsev

1996

Proc. IEEE

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Reduction of radar cross sections (RCS) is &ne of the major problems in stealth technology. Basic techniques used for RCS reduction are well known. They involve appropriate shaping, use of radar absorbing materials (RAM'S), and passive and active cancellation of the scattered jield. Detailed description of these techniques and related bibliography have been presented in RCS handbooks. In this paper we discuss these techniques briefly from the physical point of view and summarize their limitations. Attention is concentrated on discussions of the physical structure of radar waves scattered from large objects (compared with the radar wavelength). These waves consist of ordinary and diffracted rays, thier beams, and shadow radiation. The latter is caused by the transverse diffusion of the radar beam in the vicinity of the shadow boundaries behind the scattering object, i.e., in the penumbra region. Shadow radiation creates strong forward scattering and is responsible for RCS enhancement at large bistatic angles. Possible passive and active techniques to control and reduce reflected beams, rays, and shadow radiation and potential limitations of these techniques are considered in the paper. In particular, it is emphasized that grazing rejlected rays and shadow radiation cannot be eliminated by absorbing materials. 1830

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“…In the case of a vector wave, similar studies have been carried out in regard to the PO radiation surface integral [5][6][7][8].…”

Section: Introductionmentioning

confidence: 97%

Transformation of the physical optics integral to the boundary integral and its application to metal scattering problems

Murasaki

2002

Electron Comm Jpn Pt II

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SUMMARYThe physical optics approximation (PO) is a powerful calculation method in the analysis of the radiation pattern of a reflector antenna and of the radar cross section (RCS). At high frequencies, the computational efficiency of the radiation surface integration is poor. In the present research, a method is proposed in which the radiation surface integral of PO is rigorously transformed to a line integral along the scatterer boundary. Since the line integral is used in this method, the computation time can be reduced in comparison with PO. When the RCS of an arbitrary shape is computed, the shape is often approximated by a combination of planar patches. Therefore, PO and the proposed method are compared with respect to the numerically calculated scattering patterns of a circular disk and a square plate. It is confirmed that these two methods are similar in accuracy. An example of application to a three-dimensional body is presented.

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An exact line integral representation of the physical optics scattered field: the case of a perfectly conducting polyhedral structure illuminated by electric Hertzian dipoles

Cited by 52 publications

References 14 publications

Near-field line-integral representation of the Kirchhoff-type aperture radiation for a parabolic reflector

Near-field line-integral representation of the Kirchhoff-type aperture radiation for a parabolic reflector

Comments on diffraction principles and limitations of RCS reduction techniques

Transformation of the physical optics integral to the boundary integral and its application to metal scattering problems

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