Abstract
In this paper, a design of the broadband thin metamaterial absorber (MMA) is presented. Compared with the previously reported metamaterial absorbers, the proposed structure provides a wide bandwidth with a compatible overall size. The designed absorber consists of a combination of octagon disk and split octagon resonator to provide a wide bandwidth over the Ku and K bands' frequency range. Cheap FR-4 material is chosen to be a substate of the proposed absorber with 1.6 thicknesses and 6.5×6.5 overall unit cell size. CST Studio Suite was used for the simulation of the proposed absorber. The proposed absorber provides a wide absorption bandwidth of 14.4 GHz over a frequency range of 12.8-27.5 GHz with more than %90 absorptions. To analyze the proposed design, electromagnetic parameters such as permittivity permeability reflective index , and impedance were extracted and presented. The structure's working principle is analyzed and illustrated through input impedance, surface current, and the electric field of the structure. The proposed absorber compared with the recent MMA presented in the literature. The obtained results indicated that the proposed absorber has the widest bandwidth with the highest absorption value. According to these results, the proposed metamaterials absorber is a good candidate for RADAR applications.
Highlights
Metamaterials (MMs) are artificial media characterized by constitutive parameters
It is observed that the absorber cover frequency range 13-21 GHz with absorption more than 90% except 15 to 15.7 GHz in which the absorption reduced to 87%
A novel ultra-broadband thin metamaterial absorber based on an octagon-shaped resonator is presented
Summary
Metamaterials (MMs) are artificial media characterized by constitutive parameters They are generally not found in nature. Absorber material was used in aircraft construction to increase invisibility(Yin, et al, 2018). This lets the researchers investigate material with special properties in terms of practical use. Metamaterials are topological designs that provide specific characteristics and cannot be found by natural materials such as having negative permittivity, permeability, and negative refractive index (Shelby, et al, 2001) and (Smith, et al, 2000)
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