Application of Incremental Theory of Diffraction Formulation for
                        Bistatic RCS Estimation

Lee, Jae-In; Lee, Hyun-Soo; Lee, Sang-Hoon; Seo, Dong-Wook

doi:10.5515/kjkiees.2022.33.3.238

Cited by 1 publication

(2 citation statements)

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“…Moreover, in the region of 𝜙 = 150°-210°, which corresponds to the interior angle of the frontal wedge, VIRAF's ITD exhibited strange results. From [17], it was confirmed that these errors appeared because the diffracted field contribution in the interior angles of the wedge had not been set to zero. Furthermore, the results of the ITD proposed in this study showed sharp changes at 𝜙 = 120° and 240°, corresponding to the RSB of the front wedge, and a difference of about 2 dB from the MoM−PO at the corresponding angles behind the triangular impedance cylinder.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…In response to these challenges, explicit ITD formulations have been developed to successfully derive the fringe field of perfect equivalent conductor (PEC) local wedges, PEC local thin circular cylinders, and double local edges [8,16,17]. Moreover, a closed-form ITD formula for a wedge with specific exterior angles, such as a plane (n = 1) and a half-plane (n = 0.5) [12,13], has also been introduced.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Heuristic Incremental Theory of Diffraction for a Wedge with Impedance Surfaces

Kim,

Lee,

Park

et al. 2024

J. Electromagn. Eng. Sci

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This paper proposes a novel incremental theory of diffraction (ITD) formulation to calculate the fringe field from a wedge characterized by impedance surfaces and arbitrary exterior angles. The ITD formula was originally based on the Fourier transform pair relationship between the solution for the canonical wedge problem and incremental field contribution. However, this procedure can be utilized to report the ITD formula only for planar and half-planar impedance surfaces. Therefore, this paper develops a heuristic ITD formula by conceptually deriving the incremental diffracted field contribution from the uniform theory of diffraction coefficient and inferring the physical optics edge-diffracted field contribution from the terms related to the incidence shadow and reflection shadow boundaries. The proposed formula is applied to simple triangular impedance cylinder and disk models with impedance surfaces, and the results are compared with those of the method-of-moment and VIRAF’s ITD solver to show that is performs similar to the former and better than the latter.

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Section: Numerical Resultsmentioning

confidence: 99%