The paper deals with the modelling, practical implementation and characterization of a directional antenna controllable through 360° in the [2-2.5 GHz] frequency band. The antenna is composed of a central omnidirectional broadband monopole feed surrounded by a metamaterial made of one or two controllable layers of metallic strips printed on a dielectric substrate, which can be electrically continuous or discontinuous. Following the electrical state of these strips, the metamaterial can be reflective or transparent. Then by controlling the distribution of reflective and transparent regions of the latter metamaterial around the central feed, a directional emission having an angular beamwidth lower or equal to 60° and controllable through 360° is produced in the UMTS and WIFI frequency bands, demonstrating the wideband operation of this antenna.
1. Enoch, S., G. Tayeb, P. Sabouroux, N. Guerin, and P. Vincent, "A metamaterial for directive emission," Phys. Rev. Lett., Vol. 89, 213902, 2002. doi:10.1103/PhysRevLett.89.213902
2. Ourir, A., A. de Lustrac, and J.-M. Lourtioz, "Optimization of metamaterial based subwavelength cavities for ultracompact directive antennas," Microwave Opt. Technol. Lett., Vol. 48, No. 12, 2573-2577, 2006. doi:10.1002/mop.21996
3. Tichit, P.-H., S. N. Burokur, D. Germain, and A. de Lustrac, "Design and experimental demonstration of a high-directive emission with transformation optics," Phys. Rev. B, Vol. 83, 155108, 2011. doi:10.1103/PhysRevB.83.155108
4. Tichit, P.-H., S. N. Burokur, D. Germain, and A. de Lustrac, "Coordinate transformation based ultra-directive emission," Elec. Lett., Vol. 47, No. 10, 580-582, 2011. doi:10.1049/el.2011.0463
5. De Lustrac, A., F. Gadot, S. Cabaret, J.-M. Lourtioz, T. Brillat, A. Priou, and E. Akmansoy, "Experimental demonstration of electrically controllable photonic crystals at centimeter wavelengths," Appl. Phys. Lett., Vol. 75, 1625, 1999. doi:10.1063/1.124775
6. De Lustrac, A., T. Brillat, F. Gadot, and E. Akmansoy, "The use of controllable photonic band gap (CPBG) materials: An antenna application," Optical and Quantum Electronics, Vol. 34, No. 1-3, 265-277, 2002. doi:10.1023/A:1013346002839
7. Boutayeb, H., T. A. Denidni, K. Mahdjoubi, A.-C. Tarot, A.-R. Sebak, and L. Talbi, "Analysis and design of a cylindrical EBG-based directive antenna," IEEE Trans. Antennas Propag., Vol. 54, No. 1, 211-219, 2006. doi:10.1109/TAP.2005.861560
8. Boutayeb, H. and T. A. Denidni, "Metallic cylindrical EBG structures with defects: Directivity analysis and design optimization," IEEE Trans. Antennas Propag., Vol. 55, No. 11, 3356-3361, 2007. doi:10.1109/TAP.2007.908851
9. Haché, S., S. N. Burokur, A. de Lustrac, F. Gadot, P. Cailleu, and G.-P. Piau, "Principles and applications of a controllable electromagnetic band gap material to a conformable spherical radome," Eur. Phys. J. Appl. Phys., Vol. 46, 32611, 2009. doi:10.1051/epjap/2009040
10. Pendry, J. B., A. J. Holden, D. J. Robbins, and W. J. Stewart, "Low frequency plasmons in thin-wire structures," J. Phys.: Condens. Matter, Vol. 10, No. 22, 4785-4809, 1998. doi:10.1088/0953-8984/10/22/007
11. Edalati, A. and T. A. Denidni, "High-gain reconfigurable sectoral antenna using an active cylindrical FSS structure," IEEE Trans. Antennas Propag., Vol. 59, No. 7, 2465-2472, 2011. doi:10.1109/TAP.2011.2152327
12. Balanis, C. A., Antenna Theory: Analysis and Design, 2nd edition, Wiley, 1997.
13. Nicholson, A. M. and G. F. Ross, "Measurement of the intrinsic properties of materials by time-domain techniques," IEEE Trans. Instrum. Meas., Vol. 19, No. 4, 377-382, 1970. doi:10.1109/TIM.1970.4313932