High-frequency methods for multiple diffraction modeling: application and comparison

L. A. Polka, Constantine Balanis, A. C. Polycarpou

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The use of several high-frequency, asymptotic techniques is explored for modeling the scattering, using higher-order diffractions, of radar targets composed of two or more parallel edges with diminishing electrical separation between them. The Uniform Theory of Diffraction (UTD) is one of the most popular and easily applied techniques; however, difficulties in accurately modeling second-order diffractions are inherent in the method due to the failure of the technique in overlapping transition regions. The effectiveness of the UTD, as the electrical size of the target decreases, is explored using a square cylinder. Other high-frequency methods for dealing with fields in overlapping transition regions are reviewed. Particularly, the Extended Spectral Theory of Diffraction (ESTD) and the Extended Physical Theory of Diffraction (EPTD) are examined, and the EPTD is applied to the scattering by a strip. Results are compared with UTD and moment method (MM) data. A hybrid method, using the UTD plus the ESTD or the EPTD, is recommended for accurately predicting the scattering of radar targets, even of small electrical size, at all observation angles.

Original languageEnglish (US)
Pages (from-to)1223-1246
Number of pages24
JournalJournal of Electromagnetic Waves and Applications
Volume8
Issue number9-10
StatePublished - Jan 1 1994

Fingerprint

Diffraction
Modeling
diffraction
spectral theory
radar targets
Scattering
Spectral Theory
Radar
Target
Overlapping
scattering
Square Cylinder
Moment Method
Diminishing
Method of moments
Hybrid Method
Strip
strip
Higher Order
moments

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mathematical Physics
  • Physics and Astronomy (miscellaneous)
  • Statistical and Nonlinear Physics

Cite this

High-frequency methods for multiple diffraction modeling : application and comparison. / Polka, L. A.; Balanis, Constantine; Polycarpou, A. C.

In: Journal of Electromagnetic Waves and Applications, Vol. 8, No. 9-10, 01.01.1994, p. 1223-1246.

Research output: Contribution to journalArticle

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