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Including high-frequency surface diffraction in a hybrid FEBI- MLFMM-UTD method

: Balasubramanian, M.; Toccafondi, A.; Maci, S.


European Association on Antennas and Propagation -EurAAP-; Institute of Electrical and Electronics Engineers -IEEE-:
8th European Conference on Antennas and Propagation, EuCAP 2014 : 6-11 April 2014, The Hague
Piscataway, NJ: IEEE, 2014
ISBN: 978-88-907018-4-9
European Conference on Antennas and Propagation (EuCAP) <8, 2014, The Hague>
Fraunhofer FHR ()

In this paper we propose a technique for including UTD surface diffracted fields which are diffracted from curved convex objects into a multilevel fast multipole implementation (MLFMM) of the Finite Element Boundary Integral method. We use Non-Uniform Rational B-splines (NURBS) representation for efficiently describing arbitrarily shaped objects. The dyadic Green's function associated with UTD field scattered by these convex curved object is determined using a high frequency ray-based method and then inserted at the various levels of the MLFMM. Results show that the proposed hybrid MLFMM-FEBI-UTD technique for convex object allows a significant reduction in memory storage and computational effort, preserving however the accuracy in the field estimates.