Abstract
We numerically demonstrate two types of metasurface absorbers to efficiently absorb digital signals. First, we show that the digital waveforms used in this study contain not only a fundamental wave but also nonnegligible harmonic waves, which limits the absorption performance of a conventional metasurface absorber operating in only a single, finite frequency band. The first type of the proposed absorbers is designed using two kinds of unit cells, each of which absorbs either a fundamental frequency or third harmonic of an incident digital waveform. This dual-band metasurface absorber exhibits absorption performance exceeding that of the conventional metasurface absorber and more strongly dissipates the energy of a digital waveform. In addition, the second type of absorber exploits the concept of nonlinear analogous circuits to convert an incoming wave to a different waveform, specifically, a triangular waveform that has a larger magnitude at a fundamental frequency. Therefore, the incoming waveform is more effectively absorbed by this waveform-conversion metasurface absorber as well. Although still there remain some issues to put these digital signal absorbers into practice, including experimental validation, our results contribute to mitigating electromagnetic interference issues caused by digital noise and realising physically smaller, lighter digital signal processing products for the next generation.
Highlights
We numerically demonstrate two types of metasurface absorbers to efficiently absorb digital signals
Due to a growing number of wireless communication devices, such devices receive necessary signals and unnecessary electromagnetic (EM) noise, which lowers the quality of the communication environment and potentially leads to temporal malfunction or permanent damage, which is an issue well known in the field of EM c ompatibility[1]
We show a difference between the general sinusoidal waveforms targeted by most conventional metasurface absorbers and the digital waveforms focused on in this study
Summary
We numerically demonstrate two types of metasurface absorbers to efficiently absorb digital signals. Due to a growing number of wireless communication devices, such devices receive necessary signals and unnecessary electromagnetic (EM) noise, which lowers the quality of the communication environment and potentially leads to temporal malfunction or permanent damage, which is an issue well known in the field of EM c ompatibility[1] This EM interference issue can be readily solved by using absorbing materials that effectively convert the EM energy of an incident wave to thermal energy[2,3,4]. Our results contribute to suppressing digital noise more efficiently and designing the generation of smaller, lighter digital signal processing devices
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