Design and development of a multi-functional bi-anisotropic metasurface with ultra-wide out of band transmission

Abstract

This paper presents a multi-functional bi-anisotropic metasurface having ultra-wide out of band transmission characteristics. The proposed metasurface is comprised of 90° rotated T-shaped configuration yielding greater than or equal to 50% out-of-band transmission from above L- to X-band. Moreover, this metasurface achieves a maximum of 99% out-of-band transmission at lower frequency bands (i.e., L-band). The simultaneous absorptive and controlled reflection functionalities are achieved at 15.028 to 15.164 GHz along with polarization-insensitive and angular stable properties. The proposed metasurface yields state-of-the-art features compared to already published papers and has broader scope for Fabry Perot cavity, Radar cross-section (RCS) reduction, electromagnetic compatibility and interference (EMC/I) shielding, selective multi-frequency bolometers, ultrathin wave trapping filters, sensors and beam-splitters in the microwave domain.

Perspective on Meta-Boundaries

“…While bianisotropic metasurfaces provide a versatile platform for the construction of bianisotorpic meta-boundaries, the calculation or retrieval of their effective surface conductivity is generally very complicated. Despite the complexity, the relevant calculation or retrieval has been extensively investigated − and is, in principle, feasible, for example, by applying the homogenization model based polarizabilities. , One advantage of this model is that it offers a straightforward route to determine what kind of constituents that should be incorporated into the metasurface in order to obtain the desired optical response of metasurface. , Another advantage of this model allows the rigorous engineering of the whole metasurface through the calculation of the required polarizabilities of individual inclusions, if each inclusion sits in free space and does not interact with other inclusions . Moreover, recent works show that the twisted bilayer graphene in Figure c can facilitate the design of novel bianisotropic meta-boundaries, since the twisted bilayer graphene intrinsically possesses the bianisotropy, which originates from the interlayer quantum coupling. − Moreover, the bianisotropic meta-boundary assisted by the twisted bilayer graphene can support the propagation of chiral plasmons, which have not only the transverse spin but also the longitudinal spin .…”

“…145,146 One advantage of this model is that it offers a straightforward route to determine what kind of constituents that should be incorporated into the metasurface in order to obtain the desired optical response of metasurface. 142,146 Another advantage of this model allows the rigorous engineering of the whole metasurface through the calculation of the required polarizabilities of individual inclusions, if each inclusion sits in free space and does not interact with other inclusions. 146 Moreover, recent works show that the twisted bilayer graphene in Figure 5c can facilitate the design of novel bianisotropic meta-boundaries, since the twisted bilayer graphene intrinsically possesses the bianisotropy, which originates from the interlayer quantum coupling.…”

Metasurface Instrumented High Gain and Low RCS X-Band Circularly Polarized MIMO Antenna for IoT Over Satellite Application

“…RCS is a serious issue in military applications since stealth technology makes it difficult to be detected. However, other more techniques, including frequency selective surfaces, metamaterial absorbers, electromagnetic band gaps (EBG), etc., have been proposed in the literature to reduce RCS [1][2][3][4][5][6][7][8][9][10][11].…”

“…Metasurface (MS) is designed for 85% absorption in the range of 3.8 to 19.2GHz frequency with PCR greater than 0.3 in operating band for RCS reduction. In [6] Fahad Ahmed, et.al suggested multifunctional bianisotropic MS absorber worked in L, and X-band having greater than 90% absorbance. Hao Jiang, et.al [7] discussed hexagonal coupled-shaped optically transparent and UWB metamaterial absorber.…”