Asymmetric polarization converting metasurface for microwave applications

Abstract

In this paper, a triple-band polarization converting metasurface for X and K u band applications is investigated. The unit cell consists of an asymmetric circular ring, terminated with a T-shaped stub, printed on FR-4 substrate, and backed by copper cladding. The triple-band polarization convertibility of the metasurface results from the proper engineering and anisotropy along the x- and y-axis. The metasurface has three plasmonic resonances with a polarization conversion ratio (PCR) of almost 100% in the lower two frequencies bands and 95% in the higher frequency band. The plasmonic resonances at 8.2 and 13.6 GHz are due to magnetic dipole moment while response at 19 GHz is due to electric dipole moment. Cross linear polarization conversion, linear to circular polarization conversion, and circular to circular polarization conversion are observed, both for normal and oblique wave incidences. Measured and simulation results are in good agreement with an excellent polarization conversion in three frequency bands, i.e., 7.7 to 9.2 GHz, 10.8 to 15.5 GHz, and 17.5 to 19.2 GHz. The polarization conversion response of the metasurface is same for both x- and y-polarized waves and is quite stable under oblique incidence of the impinging wave. The metasurface dominates the merits of multi-band resonances, angle sensitivity, and higher PCR, and thus has eminent values for application in polarization-control appliances.

Applications of Metamaterials and Metasurfaces

“…A ω ðÞ ¼ 1 À jR xx j 2 À jR yx j 2 À T, (15) where jR xx j 2 and jR yx j 2 represents the co-and cross-polarized reflected powers, the transmitted power, i.e., T, is zero because of the metallic ground plane. For absorption both components of the reflected wave, i.e., co and cross should be zero.…”

“…Metasurfaces can be utilized to control the EM waves within one thin layer, leading to substantial advantages, such as low cost, and high degree of integration. They can be used in a wide spectrum of applications such as perfect lens [11], perfect absorbing [12], invisibility [13], light bending [14], and polarization conversion [15], to name but a few.…”

Excitation of Terahertz Spoof Surface Plasmons on a Roofed Metallic Grating by an Electron Beam

“…Their fundamental guiding schemes such as strong near-field locations and low-loss propagations have been extensively pursued and demonstrated. Moreover, these novel waveguides and meta-structures have also been proposed for some functional devices and systems such as plasmonic lenses [ 11 , 12 , 13 , 14 , 15 ], on-chip filters and splitters [ 16 , 17 , 18 ], polarization converters [ 19 , 20 ], SSP antennas [ 21 ], OAM generators [ 22 ], etc.…”

Coupled Resonator-Based Metasurface Reflector With Enhanced Magnitude and Phase Coverage

“…Metasurfaces are two-dimensional structures consisting of sub-wavelength scatterers designed to manipulate impinging electromagnetic (EM) waves to achieve functionalities beyond those found in naturally occurring materials. Typical applications of metasurface reflectors include anomalous reflection [1], polarization conversion [2], absorption [3], and cloaking [4], to name a few. Metasurface reflectors with dedicated feeds, also known as reflectarrays have many applications, particularly in synthetic aperture radars [5], [6], satellite communication [7], [8], and Mars-to-Earth communication in CubeSat missions [9].…”