Abstract
In this study, an ultra-broadband dielectric-resonator-based absorber for microwave absorption is numerically and experimentally investigated. The designed absorber is made of the carbon-loaded Acrylonitrile Butadiene Styrene (ABS) polymer and fabricated using the 3D printing technology based on fused deposition modeling with a quite low cost. Profiting from the fundamental dielectric resonator (DR) mode, the higher order DR mode and the grating mode of the dielectric resonator, the absorber shows an absorptivity higher than 90% over the whole ultra-broad operating band from 3.9 to 12 GHz. The relative bandwidth can reach over 100% and cover the whole C-band (4–8 GHz) and X-band (8–12 GHz). Utilizing the numerical simulation, we have discussed the working principle of the absorber in detail. What is more, the absorption performance under different incident angles is also simulated, and the results indicate that the absorber exhibits a high absorptivity at a wide angle of incidence. The advantages of low cost, ultra-broad operating band and a wide-angle feature make the absorber promising in the areas of microwave measurement, stealth technology and energy harvesting.
Highlights
Electromagnetic (EM) absorbers, as the components that allow for EM wave absorption, has aroused significant attention in academia and industry for a long time and is widely used in different areas, such as stealth technology [1,2], EM compatibility and shielding [3], sensors [4,5], energy harvesting [6,7], and passive cooling technologies [8,9,10]
To evaluate the proposed of design, theplate model of the the same absorber andPrototype used as a reference
Limited by the printing size of the 3D printer, the absorber is divided into 2 × 2 substructures, and each substructure consist of 5 × 5 elements
Summary
Electromagnetic (EM) absorbers, as the components that allow for EM wave absorption, has aroused significant attention in academia and industry for a long time and is widely used in different areas, such as stealth technology [1,2], EM compatibility and shielding [3], sensors [4,5], energy harvesting [6,7], and passive cooling technologies [8,9,10] In this context, numerous structures and different materials have been introduced in the design of EM absorbers. The so-called perfect metamaterial absorber (PMA) attracted much attention due to its advantageous low profile and Materials 2018, 11, 1249; doi:10.3390/ma11071249 www.mdpi.com/journal/materials
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