Dual-band absorber using low-profile multi-mode resonant units for controllable bandwidths

Abstract

A dual-band quasi-single-layer absorber based on multimode resonance is proposed. Different from the traditional multi-substrate or multi-resonator composite structure, by virtue of stub- and slot-loaded technologies, only one single-substrate printed resonator is utilized to achieve multi-mode resonant characteristics for two absorption bands. The bandwidth of the two absorption bands can be adjusted by structural parameters. Through the detailed analysis of the surface current distribution in different modes, the generation principle of the multi-mode dual-band characteristic is revealed. Finally, the dual-band absorber is fabricated and measured, achieving dual-band absorptions in the frequency range of 7.64–10.8 GHz and 15.04–17.32 GHz with fractional bandwidth (FBW) of 34.3% and 14.1%, respectively. The advantages of low-profile simple structure and controlled dual bandwidth make it very suitable for radar detection and stealth fields.

Triple-band and polarization-insensitive rectifying metasurface with flexible substrate

“…The development of metamaterials has just solved these problems. Metamaterials are a special type of artificial material that can effectively control the amplitude, phase, polarization mode, and other characteristics of electromagnetic waves [6][7][8][9]. Metasurface can be regarded as the two-dimensional counterpart of metamaterials.…”