Design and Measurement of Microwave Absorbers Comprising Resistive Frequency Selective Surfaces

Meng Zhang, Tian Jiang, Yijun Feng

School of Electronic Science and Engineering, Nanjing University, Nanjing, China.

DOI: 10.4236/jemaa.2014.68020                

Abstract

Frequency selective surfaces (FSSs) have been successfully used in constructing microwave absorbers which demonstrate the ability of modifying and improving its absorbing performances. In this paper, microwave absorber based on ferromagnetic nano-films has been proposed and investigated with a structure similar to that of the Salisbury screen except that the resistive sheet is replaced by FSS of square patch array of the nano-film. We have explored the FSS absorber from three aspects: equivalent circuit model, electromagnetic full-wave simulation and the actual sample measurement. By carefully tuning the patch size, the thickness of the dielectric spacer and the specification of the ferromagnetic nano-film, we obtain the optimized performance of broadband microwave absorbing. Due to the light weight of the nano-films, the proposed absorbers can achieve an ultra-low surface density less than 0.25 kg/m².

Keywords

Salisbury Screen, Frequency Selective Surface, Equivalent Circuit Model, Electron Beam Evaporation

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Knott, E.F., Shaeffer, J. and Tuley, M. (2004) Radar Cross Section. SciTech Publishing Inc., Raleigh.
[2]	Munk, B.A., Munk, P. and Pryor, J. (2007) On Designing Jaumann and Circuit Analog Absorbers (CA Absorbers) for Oblique Angle of Incidence. IEEE Transactions on Antennas and Propagation, 55, 186-193. http://dx.doi.org/10.1109/TAP.2006.888395
[3]	Chambers, B. (1994) Optimum Design of a Salisbury Screen Radar Absorber. Electronics Letters, 30, 1353-1354. http://dx.doi.org/10.1049/el:19940896
[4]	Seman, F.C., Cahill, R. and Fusco, V. (2009) Low Profile Salisbury Screen Radar Absorber with High Impedance Ground Plane. Electronics Letters, 45, 10-12. http://dx.doi.org/10.1049/el:20093098
[5]	Chambers, B. and Tennant, A. (1994) Design of Wideband Jaumann Radar Absorbers with Optimum Oblique Incidence Performance. Electronics Letters, 30, 1530-1532. http://dx.doi.org/10.1049/el:19941023
[6]	Costa, F., Monorchio, A. and Manara, G. (2010) Analysis and Design of Ultra Thin Electromagnetic Absorbers Comprising Resistively Loaded High Impedance Surfaces. IEEE Transactions on Antennas and Propagation, 58, 1551-1558. http://dx.doi.org/10.1109/TAP.2010.2044329
[7]	(2010) CST Microwave Studio. http://www.cst.com
[8]	Munk, B.A. (2005) Frequency Selective Surfaces: Theory and Design. John Wiley & Sons Ltd., Chichester.
[9]	Salisbury, W.W. (1952) Absorbent Body for Electromagnetic Waves. US Patent No. 2599944 A.
[10]	Fante, R.L. and Mccormack, M.T. (1988) Reflection Properties of the Salisbury Screen. IEEE Transactions on Antennas and Propagation, 36, 1443-1454. http://dx.doi.org/10.1109/8.8632
[11]	Costa, F., Monorchio, A. and Manara, G. (2009) An Equivalent Circuit Model of Frequency Selective Surfaces Embedded within Dielectric Layers. Proceedings of the 2009 IEEE Antennas and Propagation Society International Symposium, Charleston, 1-5 June 2009, 1-4.