A dual-polarized active frequency selective surface (AFSS) with switch function at LTE-D band is proposed in this paper. Double coupled metallic meandered structures on a one-layer substrate loaded PIN diodes are designed carefully to realize the band-pass characteristic at 2.6 GHz when PINs are OFF and the rejection characteristic when PINs are ON. The proposed model requires no additional biasing lines, and the amount of PINs is acceptable and affordable, which contribute to the simplicity and practicality of this AFSS in real applications. A simple equivalent circuit model (ECM) is given to better understand the design. Through full-wave simulation results, the polarization characteristics under TE and TM are almost the same, and the angle-stability stays well till 45˚. For necessary verification, one finite FSS prototype was fabricated, which was changed to one switchable AFSS by welding PINs and external feeder lines. The measured results of transmission coefficient are obtained by free space test method in the microwave anechoic chamber and agree well with the simulated ones.
1. Unal, E., A. Gokcen, and Y. Kutlu, "Effective electromagnetic shielding," IEEE Microwave Magazine, Vol. 7, No. 2, 48-54, 2006. doi:10.1109/MMW.2006.1663989
2. Munk, B. A., Frequency Selective Surfaces: Theory and Design, Wiley, New York, USA, 2005.
3. Chang, T. K., R. J. Langley, and E. A. Parler, "An active square loop frequency selective surface," IEEE Microw. Guided Wave Lett., Vol. 3, No. 10, 387-388, 1993. doi:10.1109/75.242271
4. Chang, T. K., R. J. Langle, and E. A. Parker, "Active frequency selective surface," IEEE Proc., Part H, Vol. 143, 62-66, 1996.
5. Kiani, G. I., K. L. Ford, K. P. Esselle, and A. R. Weily, "Oblique incidence performance of an active square loop frequency selective surface," The 2nd Eur. Conf. on Antennas and Propag., Edingurgh, U.K., Nov. 11-16, 2006.
6. Kiani, G. I., K. L. Ford, L. G. Olsson, K. P. Esselle, and C. J. Panagamuwa, "Switchable frequency selective surface for reconfigurable electromagnetic architecture buildings," IEEE Trans. Antennas Propag., Vol. 58, No. 2, 581-584, 2010. doi:10.1109/TAP.2009.2037772
7. Taylor, P. S., E. A. Parker, and J. C. Batchelor, "An active annular ring frequency selective surface," IEEE Trans. Antennas Propag., Vol. 59, No. 2, 3265-3271, 2011. doi:10.1109/TAP.2011.2161555
8. Yang, C., H. Li, Q. Cao, and Y. Wang, "Switchable electromagnetic shield by active frequency selective surface for LTE-2.1 GHz," Microwave and Optical Technology Letters, Vol. 58, No. 3, 535-540, 2016. doi:10.1002/mop.29617
10. Mias, C., "Waveguide and free-space demonstration of tunable frequency selective surface," Electron. Lett., Vol. 39, No. 14, 1060-1062, 2003. doi:10.1049/el:20030685
11. Sanz-Izquierdo, B., E. A. Parker, and J. C. Batchelor, "Dual-band tunable screen using complementary split ring resonators," IEEE Trans. Antennas Propag., Vol. 58, No. 11, 3761-3765, 2010. doi:10.1109/TAP.2010.2072900
12. Che, Y. X., X. Hou, and Z. Gao, "A tunable miniaturized-element frequency selective surfaces without bias network," IEEE International Conference of Microwave Technology and Computational Electromagnetics (ICMTCE), 70-73, 2011.
13. Xu, X. H., Y. Zhao, and F. C. Yu, "A novel horizontal polarization sensitive active frequency selective surface without biasing network at 2.4 GHz WiFi band," IEEE 3rd Asia-Pacific Conference of Antennas and Propagation (APCAP), 2014.
14. Sanz-Izquierdo, B. and E. A. Parker, "Dual polarized reconfigurable frequency selective surfaces," IEEE Trans. Antennas Propag., Vol. 62, No. 2, 761-771, 2014. doi:10.1109/TAP.2013.2292056