Dual-band waveform-selective metasurfaces for reflection suppression

Abstract

In this study, we present a design method to realize waveform-selective metasurface absorbers operating in more than one frequency band, which is validated both numerically and experimentally. The waveform-selective metasurface absorbers could preferentially absorb target electromagnetic waves of the same frequency in accordance with the incident waveform, more specifically, the pulse width. Although such waveform selectivity is expected to offer additional selectivity at a fixed frequency, thus far, its operation has been limited to a single frequency band. Our design method enables waveform-selective metasurface absorbers to suppress reflection depending on the incident pulse width at two independent frequencies. Importantly, the dual-band approach is enhanced by varying the spatial ratio of unit cells assigned to the two frequencies. Thus, our study opens up possibilities for the utilization of waveform-selective metasurfaces in diverse frequency bands, providing a valuable and versatile solution to address challenges spanning various applications, such as wireless communications, sensing, and electromagnetic shielding.