Passive Time-Varying Waveform-Selective Metasurfaces for Attainment of Magnetic Property Control

TL;DR

This paper introduces passive, waveform-selective metasurfaces capable of controlling magnetic properties in response to pulse width variations, expanding potential applications in electromagnetic devices.

Contribution

It presents a novel design with an added circuit layer that enables magnetic property control based on waveform duration, a feature not achieved in prior waveform-selective metasurfaces.

Findings

Successfully demonstrated magnetic property control through numerical simulations.

Validated the concept experimentally with fabricated metasurfaces.

Achieved selective magnetic dipole moments during specific pulse durations.

Abstract

We present circuit-loaded metasurfaces that behave differently in a passive manner even at the same frequency in accordance with the incoming waveform, specifically, its pulse width. Importantly, the time-varying waveform-selective metasurfaces reported thus far were mostly able to change their electric properties but not their magnetic properties; this severely limited the design range of their corresponding wave impedances and refractive indices and thus hindered the development of potential applications in antennas, sensors, imagers, signal processing, and wireless communications. In this study, passive time-varying waveform-selective metasurfaces were found to attain magnetic property control by introducing an additional circuit-loaded layer that generated an artificial magnetic dipole moment; this magnetic moment only occurred during the designed pulse duration in the time domain. Our proposed concept and structures were validated numerically and experimentally; thus, our results could be used to address electromagnetic and related issues sharing the same frequency component via the variation of the pulse width as an additional degree of freedom.