Abstract
We report a wideband and polarization-/wide-angle insensitive metamaterial absorber based on a symmetry structure associated with surface mount resistors. The proposed structure consists of a periodic array of a top metal symmetry resonator loading with four lumped resistors and a continuous metal ground plane separated by a dielectric substrate of FR-4. A prototype of the proposed absorber is fabricated and measured, confirming a good agreement between the measurement and simulation results. The proposed absorber shows polarization-insensitive behavior and the absorption response in a frequency range from 8-18 GHz covering the entire X- and Ku- bands with an absorptivity above 80$\%$ for a wide incident angle up to 40 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> for both transverse electric and transverse magnetic polarizations. Compared with the reported broadband absorbers using lumped resistors, our proposed absorber exhibits excellent characteristics in terms of compact and simple structure, high relative absorption bandwidth, and polarization and wide-incident insensitivity. Therefore, this design shows promising potential for both X- and Ku-band applications.
Highlights
Metamaterials have attracted enormous attention with various potential applications in perfect lens[1], [2], [3], holograms[4], [5], invisibility cloaking[6], [7], polarization converter[8], [9] and perfect absorber[10], [11] due to their exotic properties
It proves the relative bandwidth (RBW) of the proposed metamaterial absorber (MA) can reach to 76.92%, indicating that the designed MA achieves the ultra-broadband absorption properties
We investigate the effect of the polarization angle on the performance of the proposed MA for both transverse electric (TE) and transverse magnetic (TM) polarizations
Summary
Metamaterials have attracted enormous attention with various potential applications in perfect lens[1], [2], [3], holograms[4], [5], invisibility cloaking[6], [7], polarization converter[8], [9] and perfect absorber[10], [11] due to their exotic properties. Metamaterial absorber (MA) is one of the fastest-growing field for solar cells[12], [13], thermal emitter[14], [16], [15], antenna design[17], [18], and imaging and sensing[11], [21], [19], [20] applications. Many approaches have been proposed to extend the bandwidth of MAs such as using planar arrangement of various sizes.
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