volume | PIER Journals

Abstract

Free standing planar frequency selective surfaces (FSSs) are studied when utilized as spatial filters for linearly polarized antennas. The antenna spatial filter investigated in the present work is constructed up as a finite planar array of conducting strip dipoles. The electric field integral equation (EFIE) technique with the Rao-Wilton-Glison (RWG) basis functions are used to get the current distribution on the conducting strips. The current distribution and backscattered electric field due to an incident plane wave are calculated and compared to some published work. The effect of polarization on the scattered field, and the frequency response of the spatial filter are studied. To test the operation of the proposed planar FSS, a bowtie antenna is used with the FSS employed as a spatial filter. The field transmitted by the antenna and passed over a wide frequency band through the FSS is calculated. It is shown that such a free standing planar FSS can operate as a band stop filter for linearly polarized antennas. It is also shown that even when the size of the array is reduced, the FSS maintains its frequency response with a very slight change in the center frequency of the stop band. The effect of element size, spacing between the elements, and interleaving the columns of the FSS on the frequency response of the FSS are studied. The effect of the spatial filter on the antenna input impedance is studied over a wide frequency band. The radiation pattern of the bowtie is calculated in the presence of the spatial filter. It is shown that the existence of the later causes considerable reduction in the radiation pattern within the stop band of the filter.

1. Agrawal, V. D. and W. A. Immbriale, "Design of a dichroic Cassegrain subreflector," IEEE Trans. Antennas Propagat., Vol. 27, No. 4, 466-473, Jul. 1979.
doi:10.1109/TAP.1979.1142119

2. Lee, S.-W., "Scattering by dielectric loaded screen," IEEE Trans. Antennas Propagat., Vol. 19, No. 5, 656-665, Sep. 1971.
doi:10.1109/TAP.1971.1140010

3. Hirai, J. and I. Yokota, "Electromagnetic shielding glass of frequency selective surfaces," Electromagnetic Compatibility International Symposium, 314-316, 1999.

4. Unal, E., A. Gokcen, and Y. Kutlu, "Effective electromagnetic shielding," IEEE Microwave Magazine, Vol. 7, No. 4, 48-54, Aug. 2006.
doi:10.1109/MMW.2006.1663989

5. Govindaswamy, S., J. East, F. Terry, E. Topsakal, J. L. Volakis, and G. I. Haddadm, "Frequency selective surface based band pass filters in the near infrared region," Microwave and Optical Technology Letters, Vol. 41, No. 4, May 2004.
doi:10.1002/mop.20112

6. Qing, A., "Vector spectral-domain method for the analysis of frequency selective surfaces ," Progress In Electromagnetics Research, Vol. 65, 201-232, 2006.
doi:10.2528/PIER06091401

7. Vardaxoglou, J. C., Frequency Selective Surface, Analysis and Design, Research Studies Press Ltd., 1997.

8. Chen, C. C., "Scattering by a two dimensional periodic array of conducting plates," IEEE Trans. Antennas Propagat., Vol. 18, 660-665, 1970.
doi:10.1109/TAP.1970.1139760

9. Rao, S. M., D. R. Wilton, and A. W. Glisson, "Electromagnetic scattering by surfaces of arbitrary shape," IEEE Trans. Antennas Propagat., Vol. 30, 409-418, May 1982.
doi:10.1109/TAP.1982.1142818

10. Hussein, K. A., "Fast computational algorithm for EFIE applied to arbitrarily shaped conducting surface," Progress In Electromagnetics Research, Vol. 68, 339-357, 2007.
doi:10.2528/PIER06122502

11. Ozlem, A. C. and P. H. Pathak, "Array guided surface waves on a finite planar array of dipoles with or without a grounded substrate ," IEEE Trans. Antennas Propagat., Vol. 54, No. 8, 2244-2252, Aug. 2006.
doi:10.1109/TAP.2006.879185

12. Hussein, K. F. A., "Accurate computational algorithm for calculation of input impedance of antennas of arbitrary shaped conducting surfaces ," Applied Computational Electromagnetic Society Journal, Vol. 22, No. 3, Nov. 2007.

13. Hussein, K. A., "Effect of internal resonance on the radar cross section and shield effectiveness of open spherical enclosures," Progress In Electromagnetics Research, Vol. 70, 225-246, 2007.
doi:10.2528/PIER07012101

14. Hussein, K. A., "Efficient near-field computation for radiation and scattering from conducting surfaces of arbitrary shape," Progress In Electromagnetics Research, Vol. 69, 267-285, 2007.
doi:10.2528/PIER07010302

15. Yuan, N., X.-C. Nie, Y.-B. Gan, T.-S. Yeo, and L.-W. Li, "Accurate analysis of conformal antenna arrays with finite and curved frequency selective surfaces," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 13, 1745-1760, 2007.

16. Li, D., Y. J. Xie, P.Wang, and R. Yang, "Applications of split-ring resonances on multi-band frequency selective surfaces," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 11, 1551-1563, 2007.
doi:10.1163/156939307782000271

17. Ma, D. and W. X. Zhang, "Mechanically tunable frequency selective surface with square-loop-slot elements," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 15, 2267-2276, 2007.
doi:10.1163/156939307783134407

18. Oraizi, H. and M. Afsahi, "Analysis of planar dielectric multilayers as FSS by transmission line transfer matrix method (TLTMM)," Progress In Electromagnetics Research, Vol. 74, 217-240, 2007.
doi:10.2528/PIER07042401

19. Pirhadi, A., F. Keshmiri, M. Hakkak, and M. Tayarani, "Analysis and design of dual band high directive EBG resonator antenna using square loop FSS as superstrate layer," Progress In Electromagnetics Research, Vol. 70, 1-20, 2007.
doi:10.2528/PIER07010201

20. Delihacioglu, K., S. Uckun, and T. Ege, "FSS comprised of one-and two-turn square spiral shaped conductors on dielectric slab," Progress In Electromagnetics Research B, Vol. 6, 81-92, 2008.
doi:10.2528/PIERB08031213

Dr. Asmaa Elsayed Farahat

Professor Khalid Fawzy Ahmed Hussein

Dr. Nagda El-Minyawi