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Scattering Cross Sections of Lossy Dielectric Elliptic Cylinders for Plane Waves
Minoru ABE Yasunori HOSHIHARA Toshio SEKIGUCHI
Publication
IEICE TRANSACTIONS on Electronics
Vol.E77C
No.11
pp.17591765 Publication Date: 1994/11/25 Online ISSN:
DOI: Print ISSN: 09168516 Type of Manuscript: Special Section PAPER (Special Issue on Electromagnetic Theory) Category: Keyword: lossy dielectric elliptic cylinder, scattered field of elliptic cylinder, scattering cross section, Mathieu function,
Full Text: PDF(561.2KB)>>
Summary:
We describe the characteristics of scattering and diffraction of plane Ewaves by a lossy dielectric elliptic cylinder. The computational programs for calculating the analytic solutions for the diffraction of a lossy dielectric elliptic cylinder can be achieved. From the calculated results of the backscattering cross section (BSCS) (usually the radar cross section: RCS) and the forwardscattering cross section (FSCS) due to the crosssectional shape and complex dielectric constant of the elliptic cylinder, the features of the BSCS and FSCS can be clarified as follows. (1) There is a crosssectional shape of the cylinder which results in a minimum BSCS with a complex dielectric constant of the cylinder. (2) The BSCS and FSCS of the lossy dielectric scatterer approach zero as the scatterer approaches a strip. This result means that no material composing such a strip exists, and the features are very different from those in a perfectly conducting strip. (3) The influence of conductivity, σ, of the cylinder on a scattered wave is small for the relative dielectric constant of ε_{r}6. (4) The total scattering cross section of the lossy dielectric elliptic cylinder which causes the minimum BSCS is not small. Hence, it may be considered that the minimum BSCS is determined mainly by interference based on the crosssectional shape and complex dielectric constant of cylinder, and is not caused by incident wave absorption due to the lossy dielectric.

