This paper presents an analytical method for designing a high-efficiency frequency selective surface FSS-sandwiched dual-band circularly polarized reflectarray antenna. Results are obtained using the Computer Simulation Technology Microwave Studio (CST MWS). The antenna is designed to operate within the receiving (19.6-21.2 GHz) and transmitting (29.4-31 GHz) bands while sharing the same unit and aperture. A double-layer FSS is loaded between the upper and lower antennas to suppress mutual coupling. An analytic approximation method using conformal mapping to determine the effective permittivity (εr, eff) is observed. The transmission and reflection coefficients of the proposed FSS are synthesized using the transmission line approach. The comprehensive analyzed results obtained are compared with results obtained from the simulations performed in the CST MWS. To validate the performance of the proposed FSS-backed element configuration, a 20/30-GHz dual-band circularly polarized reflectarray with a 90-mm aperture is designed. The simulated gains are 23.3 dBi at 20 GHz and 27.7 dBi at 30 GHz with aperture efficiencies exceeding 45.25% and 57.85% in the receiving and transmitting bands, respectively.
1. Shaker, J. and M. Cuhaci, "Multi-band, multi-polarization reflector reflectarray antenna with simplified feed system and mutually independent radiation pattern," IEE Proceedings - Microwaves Antennas and Propagation, Vol. 152, No. 2, 97-101, 2005. doi:10.1049/ip-map:20045019
2. Chaharmir, M. R. and J. Shaker, "Design of an FSS-backed 20/30 GHz circularly polarized reflectarray for shared aperture X/Ka-band satellite applications," International Symposium on Antenna Technology and Applied Electromagnetics, 1-1, IEEE, 2014.
3. Smith, T., U. Gothelf, O. S. Kim, and O. Breinbjerg, "Design, manufacturing, and testing of a 20/30-GHz dual-band circularly polarized reflectarray antenna," IEEE Antennas Wireless Propag. Lett., Vol. 12, 1480-1483, Nov. 2013.
4. Shaker, J., M. R. Chaharmir, and H. Legay, "Investigation of FSS-backed reflectarray using different classes of cell elements," IEEE Transactions on Antennas and Propagation, Vol. 56, No. 12, 3700-3706, Dec. 2008. doi:10.1109/TAP.2008.2007365
5. Chaharmir, M. R. and J. Shaker, "Design of an FSS-backed 20/30 GHz circularly polarized reflectarray for shared aperture X/Ka-band satellite applications," International Symposium on Antenna Technology and Applied Electromagnetics, 1-1, IEEE, 2014.
6. Deng, R., et al., "An FSS-Backed 20/30 GHz dual-band circularly polarized reflectarray with suppressed mutual coupling and enhanced performance," IEEE Transactions on Antennas and Propagation, 2017.
7. Schinzinger, R. and P. A. A. Laura, Conformal Mapping: Methods and Applications, Dover Publications Inc., Mineola, New York, 1991.
8. Chen, E. and S. Chou, "Characteristics of coplanar transmission lines on multilayer substrates: Modeling and experiments," IEEE Trans. Microwave Theory Tech., Vol. 45, No. 6, 939-945, Jun. 1997. doi:10.1109/22.588606
9. Marcuvitz, N., Waveguide Handbook, McGraw-Hill, New York, 1951.