The IRBC Calculation for 2D Electrically Large Targets
SONG Zhi-Qiang, LIU Peng
(School of Information Science and Engineering, Key Laboratory of Wave Scattering and Remote Sensing Information, Ministry of Education, Fudan University, Shanghai 200433, China)
Abstract Evaluation of Hankel functions of zeroth and first order arises in the finite element solution of two dimensional electromagnetic scattering problems as the iterative Robin boundary condition (IRBC) is used as the openregion boundary condition. In practice, approximation of these functions is required when the target is electrically large and the computation is very timeconsuming. In this paper, four approximation algorithms are first investigated, including series expansion, small and large argument approximation, and two different kinds of numerical methods. Then the accuracy and speed are compared in the computation of IRBC. The small and large argument approximation, combined with a certain numerical method is shown to be very effective. Some examples of electrically large size are also presented.
Received: 17 August 2010
Published: 31 December 2011
