Using dual-band asymmetric transmission effect of 2D metamaterial to manipulate linear polarization state of electromagnetic waves

Abstract

This work demonstrates a two-dimensional (2D) bilayered metamaterial that exhibits dual-band asymmetric transmission (AT) effect for linear polarization. The measured cross-polarization transmissions are 0.88 at 5.68 GHz and 0.92 at 10.7 GHz in one direction, while the corresponding cross-polarization transmissions are suppressed down to 0.17 and 0.18 in the opposite direction, and the AT parameters Δx/Δy reach 0.73/−0.73 and 0.80/−0.80 respectively. The simulated surface current distributions reveal that the underlying physics originates from the induced magnetic coupling. The simulated resonant electric/magnetic field distributions show that the proposed structure follows the principle of metamaterials’ subwavelength.

Radar Cross Section Reduction of a Microstrip Antenna Based on Polarization Conversion Metamaterial

“…In [11] and [12], two kinds of metamaterials to achieve asymmetric transmission of the EW with linear polarization are…”

Asymmetric transmission and polarization conversion of linearly polarized waves with bilayer L-shaped metasurfaces

“…Since the unit cells of CMMs have no mirror symmetry, a cross-coupling effect of the electric or magnetic field on the transmitted electromagnetic wave will emerge. Therefore, asymmetric transmission (AT) [12][13][14][15][16][17][18] and polarization conversion [19][20][21][22] can be realized due to the cross-coupling effect.…”

“…Intuitively, the nonreciprocal transmission in this effect seems to be wrong; indeed, it strictly obeys Lorentz's reciprocity theorem. Previous studies have shown that the AT phenomenon can be acquired through circularly 16,17) and linearly polarized electromagnetic waves in asymmetrically spilt rings, 16,24) chiral L-shaped metastructures, 18) four U-shaped split ring resonators, 19) and twisted split ring resonators. 20) In addition, L-shaped CMMs have also been employed to realize the AT effect.…”

Transmission-type coding metasurface with ultra-broadband polarization conversion

“…AT devices related to polarization are also used in devices such as polarization converters, class diodes and photodiodes 28 , 29 . At present, researchers use artificial structures such as metamaterials 30 – 32 to design AT devices without an applied magnetic field, which are compact and more conducive to integration, and have been widely studied in microwave, near-infrared, and optical wavelength bands. MS lens or transmitarrays with ultra-low profile and flat plate features play an extremely important role in wireless communications systems.…”