FDTD computation of the RCS of high permittivity cubes

Author

Trueman, C.W. ; Luebbers, R.J. ; Mishra, S.R. ; Larose, C.

Author_Institution

Concordia Univ., Montreal, Que., Canada

fYear

1993

fDate

June 28 1993-July 2 1993

Firstpage

846

Abstract

The radar cross-section (RCS) of a dielectric cube of permittivity /spl epsi//sub r/=37.84 is computed with the finite-difference time-domain (FDTD) method and is compared with the measured RCS. When the surface of the dielectric is assumed to coincide with the surface of the cells designated as dielectric cells, then Yee´s FDTD obtains the RCS of a larger cube than expected. It is shown that a cell size adjustment of a half-cell on all the cube surfaces approximately corrects the computed RCS. A better correction is obtained by rederiving the equation used to update the tangential components of the electric field at the surface of the cube. It is shown that, when an effective permittivity is used for these surface components, the agreement with the measured RCS is improved.<>

Keywords

finite difference time-domain analysis; permittivity; radar cross-sections; FDTD; RCS; cell size adjustment; computation; dielectric cube; electric field; finite-difference time-domain; high permittivity cubes; radar cross-section; surface components; Dielectric measurements; Equations; Finite difference methods; Laboratories; Length measurement; Permittivity measurement; Resonance; Size measurement; Time domain analysis; Wavelength measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium, 1993. AP-S. Digest

Conference_Location

Ann Arbor, MI, USA

Print_ISBN

0-7803-1246-5

Type

conf

DOI

10.1109/APS.1993.385216

Filename

385216