A band enhanced metamaterial absorber based on E-shaped all-dielectric resonators

Abstract

In this paper, we propose a band enhanced metamaterial absorber in microwave band, which is composed of high-permittivity E-shaped dielectric resonators and metallic ground plate. The E-shaped all-dielectric structure is made of high-temperature microwave ceramics with high permittivity and low loss. An absorption band with 1 GHz bandwidth for both TE and TM polarizations are observed. Moreover, the absorption property is stable under different incident angles. The band enhanced absorption is caused by different resonant modes which lie closely in the absorption band. Due to the enhanced localized electric/magnetic fields at the resonant frequencies, strong absorptions are produced. Our work provides a new method of designing high-temperature and high-power microwave absorbers with band enhanced absorption.

A compact ultra‐thin ultra‐wideband microwave metamaterial absorber

“…[11][12][13][14] Nowadays, wideband absorption with ultra-thin structure is essential in many metamaterial absorber applications. Thus, metamaterial absorber with multi-layer, 15,16 multiresonant, 17,18 and single layer [19][20][21][22][23][24][25][26] structures have been proposed for wideband absorption. Although, multilayer and multiresonant structures provide wideband absorption, they suffer from thickness and large size, respectively.…”

A kind of graphene film metamaterial for terahertz absorbers

“…The optical properties of graphene have attracted particular interest in the metamaterial and plasmonic polaritons [5][6][7][8][9] . More recently, graphene-based metamaterials with perfect absorption have been theoretically and experimentally studied, including the effective surface conductivity investigations of graphene micro-ribbon metamaterials and structured graphene metamaterials [10][11][12][13][14] .In this paper, we design a perfect absorber based on graphene, and demonstrate that the perfect absorption can be achieved by the patterned graphene microstructural arrays on a thick spacer deposited on a reflecting metal substrate. Numerical simulations and analytical calculations are used to investigate the perfect absorption and the surface current resulting from a local energy field in the absorber induced by CST 2009 and a standing wave effect.…”

“…The optical properties of graphene have attracted particular interest in the metamaterial and plasmonic polaritons [5][6][7][8][9] . More recently, graphene-based metamaterials with perfect absorption have been theoretically and experimentally studied, including the effective surface conductivity investigations of graphene micro-ribbon metamaterials and structured graphene metamaterials [10][11][12][13][14] .…”

Metamaterial Absorber Comprised of Butt-Facing U-Shaped Nanoengineered Gold Metasurface

“…The interaction of microwaves with nanoscale periodic MAs results in completely different responses compared to the situation when the waves in the terahertz region are taken into account. Exotic spectral behaviors of EM waves as a function of MA size have been reported in the context of some other applications including different structural resonators, e.g., LC resonator [7], ring resonator [8] and E-shaped dielectric resonators [9], fishnet [10] and thermal switching [11].…”