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In this paper, an ultra-broadband polarization-insensitive far-infrared metamterial absorber with gold nanowire is proposed. Unlike some traditional metamaterial absorbers consisting of multilayer structure, our design is made up of gold nanowire array which is much simpler. Height and permittivity constant gradient both contribute to the broadband absorption. Each single gold nanowire acts as a nano-resonator,...
In this paper, a band stop all-dielectric metamaterial frequency selective surface (FSS) is designed based on effective medium theory and dielectric resonator theory. The FSS is made of high-permittivity ceramics without using any metallic parts. The stop band FSS is composed of 2D arrays of Jerusalem cross-shaped ceramic resonators. Solid-state sintering method is adopted to prepare the high-permittivity...
In this letter, the research on the thickness resonance of the dielectric materials using high-permittivity dielectrics is proposed based on effective medium theory. Unlike conventional bandpass FSSs, such FSS is composed of high-permittivity dielectrics plates rather than metallic or dielectric materials with structures. Strong electric and magnetic resonances are introduced to produce drastic changes...
In this paper, we proposed a type of all-dielectric metamaterial (ADM) with continues dielectric ceramics. The ceramics, possess high permitivity and low loss, are designed in fishnet shape. With this shape, continuous displacement currents are inspired inside high permitivity ceramics for the incident electromagnetic wave. Then, Lorentz type of electric and magnetic resonances are emerged simultaneously,...
In this paper, we design a band-stop all-dielectric metamaterial frequency selective surface (FSS) using dielectric ceramics. Four rectangular ceramic blocks, which possess high permittivity and low dielectric loss, can be spliced together to make the designed shapes. The design is based on effective medium theory and dielectric resonator theory. The band-stop response can be determined by the permittivity...
A mechanically tunable planar left-handed metamaterial (LHM) using SRR pairs was presented. The two identical SRRs of a SRR pair unit cell are etched on two separate substrates so that the coupling between the two SRRs can be adjusted by slipping one SRR relative to the other. The tunable planar LHM was investigated. The results show that the tunable planar LHM can be tuned within a broad range continuously,...
The Polyurethane (PU) foam materials have increasingly been used as a new kind of solid insulation material, which are always inserted into post hollow composite insulators as their inner insulation section. PU foam with PU as a base material which is homogenously filled with pores, PU foam material is a possible substitute material of the air, SF6 and N2. In order to achieve a better electrical performance,...
The application of the traditional magnetic materials in absorbing always have shortcomings of big quality and low efficiency at low frequency. On this regard, a new microwave absorber is proposed by combining the magnetic materials with the phase gradient metasurface. As an example, a composite absorber is designed by a composition of the magnetic material ECCOSORB SFU-5.5 and a phase gradient metasurface...
In this letter, a novel high-directivity microstrip patch antenna (MPA) based on planar zero-index metamaterials is presented. An averaging effect over the metamaterial structure yields an effective permittivity that approaches zero at 8.75 GHz, which results in a metamaterial with zero index of refraction. Both the simulation and experimental results show that the directivity of the antenna is effectively...
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