A low-profile superstrate antenna operated at dual-band is proposed using a metasurface (MTS). In order to design the proposed antenna, the MTS as a partially reflective surface (PRS) has a zero degree reflection phase at dual-band and is composed of a substrate, periodic metallic square patches, and rings on one side and periodic metallic meshes on the other side. To satisfy the resonance condition of Fabry-Perot cavity (FPC) at a certain frequency and height of PRS from the ground plane, the reflection phase of the MTS should be controlled by the dimension of the substrate, square patch, square ring, and mesh. In this paper, the planar radiator having a ring patch and a rectangular patch is employed and designed to operate at 2.1 GHz and 5.8 GHz. Also, the height of MTS from the ground plane is 12 mm, which corresponds to about 0.08λ0 and 0.23λ0 at operation frequencies of radiator, respectively. As a result, the gain improvements at 2.1 GHz and 5.8 GHz are measured to be 4.1 dB and 3.2 dB, respectively.
1. Trentini, G. V., "Partially reflecting sheet arrays," IRE Trans. on Antennas and Propagation, Vol. 4, 666-671, Oct. 1956. doi:10.1109/TAP.1956.1144455
2. Jackson, D. R. and N. G. Alexopoulos, "Gain enhancement methods for printed circuit antennas," IEEE Trans. on Antennas and Propagation, Vol. 33, No. 9, 976-987, Sep. 1985. doi:10.1109/TAP.1985.1143709
3. Yang, H. Y. and N. G. Alexopoulos, "Gain enhancement methods for printed circuit antennas through multiple superstrates," IEEE Trans. on Antennas and Propagation, Vol. 35, No. 7, 860-863, Jul. 1987. doi:10.1109/TAP.1987.1144186
4. Sievenpiper, D., L. Zhang, R. F. J. Broas, N. G. Alexopoulos, and E. Yablonovitch, "Highimpedance electromagnetic surfaces with a forbidden frequency band," IEEE Trans. on Microwave Theory and Technique, Vol. 47, No. 11, 2059-2074, Nov. 1999. doi:10.1109/22.798001
5. Holloway, C. L., M. A. Mohamed, E. F. Kuester, and A. Dienstfrey, "Reflection and transmission properties of a metafilm: With an application to a controllable surface composed of resonant particles," IEEE Trans. on Electromagnetic Compatibility, Vol. 47, No. 4, 853-865, Jan. 2005. doi:10.1109/TEMC.2005.853719
6. Feresidis, A. P., G. Goussetis, S. Wang, and J. C. Vardaxoglou, "Artificial magnetic conductor surfaces and their application to low-profile high-gain planar antennas," IEEE Trans. on Antennas and Propagation, Vol. 53, No. 1, 209-214, Jan. 2005. doi:10.1109/TAP.2004.840528
7. Zhou, L., H. Li, Y. Qin, Z. Wei, and C. T. Chan, "Directive emissions from subwavelength metamaterial-based cavities," Applied Physics Letters, Vol. 86, 2005. doi:10.1063/1.1844039
8. Ourir, A., A. Lustrac, and J. Lourtioz, "All-metamaterial-based subwavelength cavities for ultrathin directive antennas," Applied Physics Letters, Vol. 88, 2006.
9. Yahiaoui, R., S. N. Burokur, and A. de Lustrac, "Enhanced directivity of ultra-thin metamaterialbased cavity antenna fed by multisource," Electronics Letters, Vol. 45, No. 16, 814-816, 2009. doi:10.1049/el.2009.0641