2016/04/30 by Ariel Epstein, George V. Eleftheriades · 273 citations
Engineering · Materials Science · Physics and Astronomy · #Advanced Antenna and Metasurface Technologies #Antenna Design and Analysis #Coupling (piping) #Electrical impedance #Field (mathematics) #Lossless compression #Metamaterials and Metasurfaces Applications #Near and far field #Phase (matter) #Scattering #Stack (abstract data type) #Wavefront #physics.optics
paper · pdf · doi:10.1109/tap.2016.2588495
published in IEEE Transactions on Antennas and Propagation 64(9), 3880-3895 (IEEE Antennas & Propagation Society) · 16 pages, 10 figures
openalex created_date 2016/06/24 · arxiv created 2016/07/06 · arxiv updated 2016/07/07 · openalex publication_date 2016/07/07 · openalex updated_date 2026/08/05
We present a general theory for designing realistic omega-type bianisotropic metasurfaces (O-BMSs), unlocking their full potential for molding electromagnetic fields. These metasurfaces, characterized by electric surface impedance, magnetic surface admittance, and magnetoelectric coupling coefficient, were previously considered for wavefront manipulation. However, previous reports mainly considered plane-wave excitations, and implementations included cumbersome metallic features. In this paper, we prove that any field transformation that locally conserves real power can be implemented via passive and lossless meta-atoms characterized by closed-form expressions; this allows rigorous incorporation of arbitrary source and scattering configurations. Subsequently, we show that O-BMS meta-atoms can be implemented using an asymmetric stack of three impedance sheets, an appealing structure for printed circuit board fabrication. Our formulation reveals that, as opposed to Huygens' metasurfaces, which exhibit negligible magnetoelectric coupling, O-BMSs are not limited to controlling the phase of transmitted fields, but can rather achieve a high level of control over the amplitude and phase of reflected fields. This is demonstrated by designing O-BMSs for reflectionless wide-angle refraction, independent surface-wave guiding, and a highly directive low-profile antenna, verified with full-wave simulations. This straightforward methodology facilitates the development of O-BMS-based devices for controlling the near and far fields of arbitrary sources in complex scattering configurations.