Multi-Functional Antennas Based on Meta-Surfaces

Abstract

The design of a multi-functional antenna based on meta-surfaces is investigated. The proposed structure consists of a wideband dipole antenna located between two meta-surfaces working in different frequency bands. The result is an antenna with enhanced gain that radiates in a different half-space at each frequency band. A prototype composed of an elliptical dipole and two meta-surfaces formed by grids of cut and continuous wires demonstrates that the proposed antenna discriminates the radiation in different half-spaces, as well as increases the gain of a nearly omnidirectional dipole to values 8.9 dBi and 7.7 dBi for the top and bottom half-spaces, respectively. Moreover, the antenna remains planar with total thickness of 0 13 at the lowest resonant frequency.Index Terms-Low-profile antenna, meta-surfaces, multi-functional antenna, spatial diversity.

Multifrequency Radiator With Spatial Diversity Based on Metasurfaces

“…In fact, the antenna features two peaks of 7.6 and 6.8 dBi gain at , with 12.6 and 23.8 dB of front-to-back radiation ratio, respectively. As a difference to [6], the gain in the higher frequency band is superior to the gain at the lower frequency band, and more than one resonant mode is excited. This is produced by the multiresonant dipole instead of the broadband one.…”

“…A preliminary proof-of-concept design was presented in [6]. However, the selection of the primary antenna has a dramatic 1536-1225/$31.00 © 2012 IEEE impact on the performance of the radiating system, and the selection of a wideband elliptical dipole introduced several limitations.…”

Stacked dual‐band antenna with flexible combination structure based on frequency selective surface

“…With this geometry, the antenna radiates in a different half-space at each frequency band with enhanced gain. 16 As the leaky wave passage, the metasurface cavity can be capable of coupling the linearly polarized mode of incident wave and changing into the resonant mode with birefringent radiations of right-hand and left-hand CP waves. 19 They are strongly coupled in the H-plane with the edge-to-edge spacing of only 0.008 wavelengths for two nearby dual-band patch antennas.…”

Tunable metasurface with controllable polarizations and reflection/transmission properties

“…Metasurfaces as a planar version of metamaterials [1][2][3][4] attracted significant attention due to their flexible control on the amplitude, phase, and polarization of electromagnetic (EM) waves. Numerous physical phenomena and practical applications of metasurfaces are reported [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], and include anomalous refraction or reflection [6][7][8][9], ultrathin meta-lenses [10][11][12], ultrathin cloaks [13][14][15][16][17], superscattering [15,16] and multifunctional antennas [18][19][20]. In addition to the microwave band, the terahertz waveband is also a research hotspot [23][24][25].…”