Controlling Electromagnetic Wavefronts Using Huygens' Metasurfaces

Abstract

In this paper, the possible realization of the electromagnetic (EM) absorber as a thin metasurface is considered. The metasurface is based on establishing a passive surface of electric and magnetic currents using the Huygen's principle. So, the absorber is named Huygens Absorber (HA). The metasurface can be designed using split meander lines with spiral rings. In this way, both sides of the substrate must be patterned to obtain electric and magnetic currents. In this paper, it is shown that the currents can be obtained using appropriate cells based on bi-anisotropic media theory. It is shown that to obtain a normal absorber, appropriate omega particles can be used. It is worth noting that the proposed absorber does not need any lossy material to absorb the waves which is a unique and excellent property of this kind of absorber. It is a thin groundless surface which makes it possible to design a double-sided metasurface.

Floquet analysis of parametric huygens' metasurfaces

“…To validate the results of the proposed method, an FDTD solver is used, which has been recently proposed in [16] [17] to directly simulate (8) and (9), for an arbitrary time-domain input. A brief summary of the method is described in the appendix for self-consistency of the paper.…”

“…1 with the plane-wave input and output fields described in (7). The field equations governing the transmitted and reflected fields are the time-domain Lorentz relations (8) and the GSTC equations (9).…”

“…They are constructed using a 2-D array of electrically small Huygen's sources, exhibiting perfect cancellation of backscattered fields, due to optimal interactions of their electric and magnetic dipolar moments [4]. Some efficient implementations of Huygens' metasurfaces are based on all-dielectric resonators [5][1] [6] and orthogonally collocated small electric and magnetic dipoles [7] [8].…”

Analog Beamforming Techniques Using Leaky-Wave Antennas & Metasurfaces

“…For instance, the limitation of broadside radiation from the highly-efficient slot array antenna used in GATE systems can be overcome by using a Huygens' surface to engineer the near-field of this antenna to achieve additional far-field radiation characteristics. Huygens' sources can be realized using metallic structures such as superimposed straight wires and loops [19,186] or using dielectric resonators [187][188][189][190][191][192]. Huygens' metallic metasurfaces feature compact unit cells with small sub-wavelength sizes compared to their dielectric counterparts.…”