EFIE analyses of 3-D scattering from an object above arbitrarily rough periodic surfaces by current decomposition method

Abstract

This paper addresses a three-dimensional scattering problem from a PEC object above a periodic conductive rough surface by using a decomposition method based on the separation of equivalent current density on the periodic surface as induced and perturbed current densities. The infinite solution domain is forcibly bounded by assuming that the perturbed current density caused by the object is intensively dominant in only a limited area on the periodic surface. The proposed decomposition method achieves considerable accuracy while providing an effortless computation without attempting a half-space Green's function or exercising a tapered wave illumination. This method provides a significantly superior solution to the tapered wave approach in illumination at low-grazing angles, although a plane wave is harnessed. Also, this proposed method can handle an arbitrary degree of roughness since the solution method does not contain an approximation of the surface roughness.

KEYWORDS:

• Moments method
• perturbation current
• periodic surface
• decomposition method

Acknowledgment

This work was supported by the Scientific and Technological Research Council of Turkey (TUBITAK) under Project Number 119N196.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by Turkiye Bilimsel ve Teknolojik Arastirma Kurumu: [Grant Number 119N196].

Notes on contributors

Yunus Emre Yamac

Yunus Emre Yamac was born in Konya, Turkey, in 1989. He received the BS degree in electronics and communications engineering from Suleyman Demirel University in 2013 and the MS degree in electrical - electronics engineering from Akdeniz University in 2015. He is currently pursuing a Ph.D. degree at Yildiz Technical University. His research interests include antenna designs for biomedical, radar, and remote-sensing applications and moment method solutions of surface IEs for scattering problems from objects below or above rough surfaces.

Ahmet Kizilay

Ahmet Kizilay was born in Istanbul, Turkey, in 1969. He received the B.Sc. degree in electronics and telecommunications engineering from Yildiz University in 1990, and the M.Sc. and Ph.D. degrees in electrical engineering from Michigan State University, East Lansing, in 1994 and 2000, respectively. In July 2001, he joined the Department of Electronics and Telecommunications Engineering, Yildiz Technical University, where he has currently been as a Full Professor. His main research interests include time-domain electromagnetic scattering, electromagnetic wave theory, and fiber optics.