Hostname: page-component-8448b6f56d-dnltx Total loading time: 0 Render date: 2024-04-24T06:44:52.994Z Has data issue: false hasContentIssue false
  • English
  • Français

Room shielding with frequency-selective surfaces for electromagnetic health application

Published online by Cambridge University Press:  16 February 2016

Soheil Hashemi  and
Ali Abdolali
Soheil Hashemi*
Affiliation:
Department of Electrical Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran Bioelectromagnetics Laboratory, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran
Ali Abdolali
Affiliation:
Department of Electrical Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran Bioelectromagnetics Laboratory, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran
*
Corresponding author: S. Hashemi Email: s_hashemy@iust.ac.ir
Get access Rights & Permissions [Opens in a new window]

Abstract

Use of frequency-selective surfaces (FSSs) is proposed to shield rooms against electromagnetic fields in order to achieve secure indoor communications and reduce human exposure to external fields. The secure room is designed using two-layer FSSs with an FR4 substrate to cover 10–12 GHz frequency band. Different elements in each layer and shift in the position of elements are the reasons for more than 3 GHz bandwidths in X band. The performance of the structure is also stable versus the misaligned position of layers. An equivalent circuit model is proposed for the structure and results show −20 dB isolation between inside and outside of the room in the desired frequency band. Bio tissue is located inside the cubic structure with FSS walls and the results of the specific absorption rate are demonstrated and compared in two rooms with FSS cover on concrete walls and a room with concrete walls. The 17 × 17 cm2 two-layer FSS is fabricated for the measurement and the results are presented. The designed FSS can be used in the construction of wave-isolated room for any application.

Keywords

Secure communicationElectromagnetic hygieneFrequency-selective surfaces
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Issue 2 , March 2017 , pp. 291 - 298
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2016 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

[1] Mason, P.A.; Murphy, M.R.; Petersen, R.C.: IEEE EMF health & safety standards, in IEEE SCC-28 Standards.Google Scholar
[2] Mias, C.; Tsakonas, C.; Oswald, C.: An Investigation into the Feasibility of designing Frequency Selective Windows employing periodic structures. (Ref. AY3922, TheNottingham Trent University Department of Electrical And Electronic Engineering).Google Scholar
[3] Roberts, J.; Rigelsford, J.M.; Ford, K.L.: Diffraction from Frequency Selective Surfaces for secure building applications, in 6th European Conf. on Antennas and Propagation (EUCAP), IEEE, Prague, 2012, pp. 2388–2391.Google Scholar
[4] Ford, K.L.; Roberts, J.; Zhou, S.; Fong, G.; Rigelsford, J.: Reconfigurable frequency selective surface for use in secure electromagnetic buildings. Electron. Lett., 49 (14) (2013), 861–863.Google Scholar
[5] Munk, B.A.: Frequency Selective Surfaces-Theory and Design, John-Wily and Sons, New York, 2000.Google Scholar
[6] Langley, R.J.; Lee, C.K.: Design of single-layer frequency selective surfaces for multiband reflector antennas. Electromagnetics, 5 (4) (1985), 331–347.Google Scholar
[7] Munk, B.A.: Broadband Wire Arrays, in Finite Antenna Arrays and FSS, John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/0471457531.ch6.Google Scholar
[8] Bayatpur, F.: Metamaterial-Inspired Frequency-Selective Surfaces. Doctor of Philosophy (Electrical Engineering). The University of Michigan, MI, 2009.Google Scholar
[9] Hooberman, B.: Everything You Ever Wanted to Know About Frequency Selective Surface _lters but Were Afraid to Ask, Technical Report, 2005.Google Scholar
[10] Lee, C.K.; Langley, R.J.: Equivalent-circuit models for frequency-selective surfacesat oblique angles of incidence, in Microwaves, Antennas and Propagation, IEE Proceedings H (Vol. 132, No. 6, 1985, pp. 395–399). IET.Google Scholar
[11] Kohlgraf, D.C.: Design and Testing of a Frequency Selective Surface (FSS) BasedWide-Band Multiple Antenna System, Department of Electrical and Computer Engineering, The Ohio State University, OH, 2005.Google Scholar
[12] Dewani, A.A.; O'Keefe, S.G.; Thiel, D.V.; Galehdar, A.: Optically transparent frequency selective surfaces on flexible thin plastic substrates. AIP Adv., 5 (2) (2015), 027107.Google Scholar
[13] Tsakonas, C. et al. : Optically transparent frequency selective window for microwave applications. Electron. Lett., 37 (24) (2001), 1464–1466.Google Scholar