Research Progress in Smart Tunable Electromagnetic Materials

Abstract

Smart tunable electromagnetic materials can regulate and control their electromagnetic parameters by applying an external field, thus realizing the goal of smartly and actively controlling their electromagnetic properties such as response frequency, resonance range, phase, and polarization. In this paper, smart tunable electromagnetic materials are classified into conductive polymer-based tunable materials, electronic component-based tunable metamaterials, liquid crystal-based tunable materials, graphene-based tunable materials according to different tunable substrates. The relevant research progress of smart tunable electromagnetic materials is reviewed, and their application directions are summarized.

Design of a wideband and tunable radar absorber

“…Graphene, a 2-D nanomaterial composed of a single layer of carbon atoms, has high mechanical strength and excellent electrical conductivity. The conductivity of graphene can be adjusted when its chemical potential is varied by applying a bias or doping, which endows it great potential for application in tunable radar absorber and plasmonic structure [22][23][24][25][26]. When voltage was supplied to the multi-layer graphene in a radar absorber created by A G D'Aloia [27], the absorber's reflectance might be as low as −10 dB from 7 to 22 GHz.…”