Augmented combined field integral equation for low frequency scattering analysis. Issue 11 (7th August 2017)

• Record Type: Journal Article
• Authors: Wen, Dingbang; Nie, Zaiping; Liu, Lu; Tan, Jun
• Is Part Of: IET microwaves, antennas & propagation. Volume 11:Issue 11(2017)
• Page Start: 1510
• Page End: 1515
• Publication Date: 2017-08-07
• Subjects: electromagnetic wave scattering -- electromagnetic fields -- integral equations; augmented combined field integral equation -- low frequency scattering analysis -- low‐frequency breakdown problem -- magnetic field integral operator -- saddle point constraint preconditioning -- convergence property -- system matrix -- perturbation method; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2016.0894
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : In this study, a new augmented combined field integral equation formulation has been proposed to address the low‐frequency breakdown problem. The proposed formulation is developed by adding the magnetic field integral operator to the conventional augmented electric field integral equation (AEFIE). In the meanwhile, a saddle point constraint preconditioning is also introduced to improve the convergence property of the system matrix. In some cases, the conventional AEFIE method cannot achieve the accurate solutions when the frequency is extremely low and a perturbation method is needed to tackle this accuracy problem. However, the new method is able to get the accurate solutions without any other strategy in the same cases mentioned above. Some numerical examples have been presented to demonstrate the validity of the proposed method.