Metasurfaces can provide novel functionality for absorbing electromagnetic waves through a periodic array of inductive/capacitive resonators by controlling the material's permittivity and permeability. This attractive characteristic makes them widely applicable to various electromagnetic applications. However, conventional metasurfaces are dispersive and suffer from a narrow bandwidth with uncontrollable and unchangeable functions because the effective permittivity and permeability are tailored to a certain resonance frequency. Therefore, many studies have focused on how to increase the absorption frequency bandwidth and control the absorption frequency by using reconfigurable metasurfaces. This paper presents a report on the most recent progress in the realization of reconfigurable metasurfaces based on advanced materials for frequency‐selective absorption in the microwave, millimeter‐wave, sub‐terahertz, terahertz, and visible ranges. Furthermore, their tuning ratios for different advanced materials and spectra are summarized and compared. This progress report provides guidelines for the material selection for and the design of reconfigurable metasurfaces.
Reconfigurable metasurfaces have shown their great potentials and are needed in multiple applications, such as radar, wireless communication systems, and security. To date, however, it is challenging to realize low-cost and simple reconfigurable and multifunctional metasurfaces. In this proposed work, we present a low-cost and simple multifunctional all-passive metasurface that achieves a self-switching characteristic relying on a modulating incident wave without additional supporting devices. As proof-ofprinciple application examples, we realize a prototype of the proposed all-passive metasurface with an antenna for radome applications, that can achieve self-switching operation between a high directional antenna at the transmitting mode, and radar absorbing structure and reflector at the receiving mode. The reported strategy will open up a new avenue for future smart devices and could extend to some smarter applications such as highpower pulse skin protection for electronic devices and self-reconfigurable beam switching metasurface.
Dynamic beam-steering electromagnetic waves are traditionally achieved using phased array antennae, where individual phase shifter modules independently control phase profiles for each antenna element. [18][19][20] However, these are bulky, expensive, and require high complexity hardware such as digital-toanalogue (DACs) and analogue-to-digital
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.