A Higher -Order Finite Element: Boundary Integral Method for Electromagnetic Scattering and Radiation From Bodies of Revolution

The hybrid finite element - boundary integral method (FE-BI) is used to compute the radar cross section (RCS) and radiated fields of bodies of revolution (BOR). This is a 2.5-D problem since it allows simulations in a 2-D domain to correspond to a full 3-D object. The interior region, which corresponds to the local near-field of the scatterer/radiator is modeled with a higher-order finite element method (FEM) using interpolatory mixed node/vector basis functions. The radiation condition for the exterior region is enforced by using the method of moments (MoM) to form a boundary integral to enclose the interior region. Scattering problems are excited by a uniform plane wave which is decomposed into a superposition of cylindrical waves. Likewise, radiation problems are excited by local current sources which are decomposed into a Fourier series. For both scattering and radiation analysis each Fourier/cylindrical mode can be evaluated independently. The FE-BI method very accurately models the fields generated by any BOR. Increasing the order of the basis functions is shown to further improve the accuracy.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Electrical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Dunn, Eric Alan

Contributors dc:contributor

• Jin, Jianming

• Physics, Electricity and Magnetism

Language dc:language

eng

Identifier

(MiAaPQ)AAI3198979

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/80919