Efficient Method Based on SMW Formula for Analyzing PEC Targets with Partial and Thin Coatings

Authors

  • Xinlei Chen 1Key Laboratory of Radar Imaging and Microwave Photonics, College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China 2Key Laboratory of Meteorological Disaster (KLME) Ministry of Education & Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing, China 3State Key Laboratory of Millimeter Waves, Southeast University, China
  • Zhiwen Dong Key Laboratory of Radar Imaging and Microwave Photonics, College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
  • Guiyue Yu Key Laboratory of Radar Imaging and Microwave Photonics, College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
  • Ziwei Li Key Laboratory of Radar Imaging and Microwave Photonics, College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
  • Lichang Lu Key Laboratory of Radar Imaging and Microwave Photonics, College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
  • Changqing Gu Key Laboratory of Radar Imaging and Microwave Photonics, College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China

DOI:

https://doi.org/10.13052/2021.ACES.J.361002

Keywords:

Electromagnetic scattering, method of moments, Sherman-Morrison-Woodbury formula, thin coating.

Abstract

The analysis of the electromagnetic scattering from the perfect electric conductor (PEC) partially coated with thin material is a significant task in stealth design. Previous research has shown the scattering can be calculated by only discretizing the current on PEC in the case of thin coating layers. However, it has a downside that it will recalculate a complete solution when the geometry or electromagnetic properties of the coating changes. In this paper, a Sherman-Morrison-Woodbury (SMW) formula-based method is proposed to address this problem. According to the SMW formulation, it can reuse the inverse impedance matrix of the PEC part to efficiently obtain the solutions when local coating changes, so it can avoid the subsequent complete inverse of the new impedance matrix. Furthermore, it employs the fast direct solution method based on the SMW formulation to accelerate the calculation of inverse matrix of the PEC part. Numerical results demonstrate the performance of the proposed method.

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Published

2021-11-21

How to Cite

[1]
X. . Chen, Z. . Dong, G. . Yu, Z. . Li, L. . Lu, and C. . Gu, “Efficient Method Based on SMW Formula for Analyzing PEC Targets with Partial and Thin Coatings”, ACES Journal, vol. 36, no. 10, pp. 1274–1280, Nov. 2021.

Issue

2021: Vol 36 Iss 10

Section

General Submission