中国物理B ›› 2012, Vol. 21 ›› Issue (5): 55201-055201.doi: 10.1088/1674-1056/21/5/055201

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Improvement on the wave absorbing property of a lossy frequency selective surface absorber using a magnetic substrate

孙良奎,程海峰,周永江,王军   

  1. Key Laboratory of Advanced Ceramic Fibers and Composites, College of Aerospace and Materials Engineering, National University of Defence Technology, Changsha 410073, China
  • 收稿日期:2011-06-23 修回日期:2012-04-27 出版日期:2012-04-01 发布日期:2012-04-01

Improvement on the wave absorbing property of a lossy frequency selective surface absorber using a magnetic substrate

Sun Liang-Kui(孙良奎)†, Cheng Hai-Feng(程海峰), Zhou Yong-Jiang(周永江), and Wang jun(王军)   

  1. Key Laboratory of Advanced Ceramic Fibers and Composites, College of Aerospace and Materials Engineering, National University of Defence Technology, Changsha 410073, China
  • Received:2011-06-23 Revised:2012-04-27 Online:2012-04-01 Published:2012-04-01

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摘要： An equivalent-circuit model is used to analyse the improvement of the wave absorbing performance of the lossy frequency selective surface (FSS) absorber by using a magnetic substrate, showing that it is possible to widen the wave absorbing bandwidth. Three pieces of magnetic substrates are prepared. According to the complex permittivity and permeability, the reflectivity of the corresponding absorber is calculated by the finite difference time-domain (FDTD) method, and the bandwidth of the reflectivity below-10 dB is optimized by genetic algorithm. The calculated results indicate that the wave absorbing performance is significantly improved by increasing the complex permeability of the substrate; the reflectivity bandwidth below-10 dB of the single layer FSS absorber can reach 3.6--18 GHz with a thickness of 5 mm, which is wider than that with a dielectric substrate. The density of the FSS absorber is only 0.92 g/cm3. Additionally, the absorption band can be further widened by inserting a second lossy FSS. Finally, a double layer lossy FSS absorber with a magnetic substrate is fabricated based on the design result. The experimental result is consistent with the design one.

关键词: wave absorbing performance, lossy frequency selective surface (FSS), bandwidth

Abstract: An equivalent-circuit model is used to analyse the improvement of the wave absorbing performance of the lossy frequency selective surface (FSS) absorber by using a magnetic substrate, showing that it is possible to widen the wave absorbing bandwidth. Three pieces of magnetic substrates are prepared. According to the complex permittivity and permeability, the reflectivity of the corresponding absorber is calculated by the finite difference time-domain (FDTD) method, and the bandwidth of the reflectivity below-10 dB is optimized by genetic algorithm. The calculated results indicate that the wave absorbing performance is significantly improved by increasing the complex permeability of the substrate; the reflectivity bandwidth below-10 dB of the single layer FSS absorber can reach 3.6--18 GHz with a thickness of 5 mm, which is wider than that with a dielectric substrate. The density of the FSS absorber is only 0.92 g/cm3. Additionally, the absorption band can be further widened by inserting a second lossy FSS. Finally, a double layer lossy FSS absorber with a magnetic substrate is fabricated based on the design result. The experimental result is consistent with the design one.

Key words: wave absorbing performance, lossy frequency selective surface (FSS), bandwidth

中图分类号:  (Emission, absorption, and scattering of electromagnetic radiation ?)

  • 52.25.Os
68.35.bt (Other materials) 68.43.Fg (Adsorbate structure (binding sites, geometry))