A characteristic mode basis function method for solving wide-angle electromagnetic scattering problems

Abstract

In the characteristic basis function method (CBFM) for the wide-angle electromagnetic scattering problems of electrically large objects, the low generation efficiency, and many characteristic basis functions exist due to the dependence on external excitation. This paper proposes a characteristic mode basis function method (CMBFM) with novel basis function construction to address this issue. In CMBFM, characteristic modes of each extended block obtained by dividing objects are calculated separately, and then the effective modes are selected as basis functions according to the modal significance. Compared with CBFM, the time performance of constructing basis functions is improved significantly. Furthermore, fewer basis functions are generated without a loss of accuracy. The corresponding numerical results demonstrate that significant efficiency and accuracy can be achieved by the proposed approach.

KEYWORDS:

• Characteristic mode
• characteristic basis function
• wide angle
• method of moments

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported in part by the Natural Science Foundation of the Anhui Higher Education Institutions of China [grant number KJ2020A0307], in part by the National Natural Science Foundation of China [grant number 62071004], and in part by the Natural Science Foundation of Anhui Provincial [grant number 2108085MF200], [grant number 1808085MF166].