Multi-resonant tessellated anchor-based metasurfaces

Abstract

In this work, a multi-resonant metasurface that can be tailored to absorb microwaves at one or more frequencies is explored. Surface shapes based on an ‘anchor’ motif, incorporating hexagonal, square and triangular-shaped resonant elements, are shown to be readily tailorable to provide a targeted range of microwave responses. A metasurface consisting of an etched copper layer, spaced above a ground plane by a thin (< 1/10th of a wavelength) low-loss dielectric is experimentally characterised. The fundamental resonances of each shaped element are exhibited at 4.1 GHz (triangular), 6.1 GHz (square) and 10.1 GHz (hexagonal), providing the potential for single- and multi-frequency absorption across a range that is of interest to the food industry. Reflectivity measurements of the metasurface demonstrate that the three fundamental absorption modes are largely independent of incident polarization as well as both azimuthal and elevation angles.

Simulation of the microwave five-band a perfect metamaterial absorber for the 5G communication‏

“… Ref. Number of absorption bands Absorption peak resonance (GHz) Frequency band Structure complexity Other factors [ 9 ] 1 3.374 S Simple structure Single narrow band based on hole ring [ 41 ] 2 6.45, 14.89 C and Ku Complex structure Double narrow bands based on Tuning fork shape [ 42 ] 3 4.1, 6.1, 10.1 S, C and X Complex structure Narrow bands based on three anchors [ 43 ] 3 4.2, 5.6, 7.7 C Simple structure Three broad bands and polarisation sensitive. [ 44 ] 4 7.09, 9.25, 10.42, 12.94 C, X and Ku Complex design Four bands based on Dual-T Circular Shape This work 5 20.38, 21.75, 23.1, 24.22, 25.12 K and Ka Simple structure Five broad bands based on folded arms resonator …”

Planar Complementary Archimedes Metamaterial Absorber with Polarization Sensitivity for Microwave Sensing Applications

“…Efforts have been made to achieve multi-band or broadband high-level absorption for EM waves [26,27,28,29,30,31,32,33]. Two design strategies have been employed: combining multiple sub-units within a super-unit resonant structure [6,7,8], or constructing alternating patterned metallic structures and dielectric layers with different geometric parameters [28,29,30,31,32]. However, both strategies have limitations, such as increased fabrication cost, angular dependence, and neglecting high-order EM responses.…”