volume | PIER Journals

Abstract

Circularly polarized graphene based transmitarray for terahertz applications is proposed. The characteristics of the graphene material is explained. The cell element of the transmitarray is made of square Quartz cell. Dual circular graphene rings are printed on both sides of the Quartz substrate. The graphene ring radius is varied to change the transmission coefficient phase and magnitude. The effect of the graphene chemical potential on the transmission coefficient is demonstrated. Transmitarray is composed of 9×9 unit cell elements. A circularly polarized circular horn is used to feed the transmitarray at f=6 THz. The left- and right-hand field components in the E- and H-plane are determined. The variation of the gain and the axial-ratio with the frequency are explained. The peak gain is 18.63 dB and 1-dB gain bandwidth is 6.8%. The transmitarray produces a circular polarization from 5.5 THz to 6.5 THz.

1. Choi, W. and J. Lee, Graphene: Synthesis and Applications, CRC Press Taylor & Francis Group, NW, USA, 2012.

2. Bao, W., Electrical and mechanical properties of graphene, Ph.D Thesis, University of California Riverside, USA, 2012.

3. Jian, L., Graphene and its hybrid nanostructures for nanoelectronics and energy applications, Ph.D Thesis, University of California Riverside, USA, 2011.

4. Hansen, R. C., Phased Array Antennas, John Wiley & Sons, Inc., Hoboken, NJ, USA, 2009.

5. Hum, S. V. and J. Perruisseau-Carrier, "Reconfigurable reflectarray and array lenses for dynamic antenna beam control: A review," IEEE Transactions on Antennas and Propagation, Vol. 62, No. 1, 183-198, Jan. 2014.

6. Rodrigo, D., L. Jofre, and J. Perruisseau-Carrier, "Unit cell for frequency-tunable beamscanning reflectarrays," IEEE Transactions on Antennas and Propagation, Vol. 61, No. 12, 5992-5999, 2013.

7. Gaber, S. M., Analysis and design of reflectarrays/transmitarrays antennas, Ph.D Thesis, Minoufiya University, 2013.

8. Huang, J. and J. A. Encinar, Reflectarray Antennas, Wiley-IEEE Press, Pisataway, NJ, 2007.

9. Zainud-Deen, S. H., H. A. Malhat, S. M. Gaber, and K. H. Awadalla, "Perforated nanoantenna reflectarray," Progress In Electromagnetics Research M, Vol. 29, 253-265, 2013.

10. Zainud-Deen, S. H., H. A. Malhat, S. M. Gaber, and K. H. Awadalla, "Plasma reflectarray," Plasmonic Journal, Vol. 8, 1469-1475, 2013.

11. Zainud-Deen, S. H., H. A. Malhat, S. M. Gaber, and K. H. Awadalla, "Beam steering plasma reflectarray/transmitarray antennas," Plasmonic Journal, DOI 10.1007/s11468-013-9645-4, 2013.

12. Lau, J. Y. and S. V. Hum, "Reconfigurable transmitarray design approaches for beamforming applications," IEEE Transactions on Antennas and Propagation, Vol. 60, No. 12, 5679-5689, Dec. 2012.

13. Lau, J. Y. and S. V. Hum, "A wideband reconfigurable transmitarray element," IEEE Transactions on Antennas and Propagation, Vol. 60, No. 3, 1303-1311, Mar. 2012.

14. Cooke, S. J., R. Shtokhamer, A. A. Mondelli, and B. Levush, "A finite integration method for conformal, structure-grid, electromagnetic simulation," Journal of Computational Physics, Vol. 215, 321-347, 2006.

15. Rouhi, N., S. Capdevila, D. Jain, K. Zand, Y. Wang, E. Brown, L. Jofre, and P. Burke, "Terahertz graphene optics," Nano Research Journal, Vol. 5, No. 10, 667-678, Oct. 2012.

16. Kadhom, M. J., J. S. Aziz, and R. S. Fyath, "Performance investigation of loop and helical carbon nanotube antennas," Journal of Emerging Trends in Computing and Information Sciences, Vol. 3, No. 12, 1606-1613, Dec. 2012.

Dr. Hend Abd El-Azem Malhat

Professor Saber Zainud-Deen

Dr. Shaymaa Gaber