Abstract

This work presents a multi-resonance antenna with large bandwidth and stable radiation gain by using a nonperiodic square-ring metasurface (MS). The non-periodic MS radiator is formed by several adjustable square-ring patches and fed by a microstrip line through a coupling slot. By properly adjusting the widths of these square rings, different resonance modes can be inspired for the MS. Combining with the resonance mode of the coupling slot, multiple adjacent resonances occur so as to realize a wideband and consistent radiation. For demonstration, a C-band wideband antenna based on the proposed 4×4 square-ring MS units with a low-profile of 0.06λ 0 is accordingly designed and fabricated. Both the simulated and measured results indicate a large bandwidth of 47% (4.4-7.1GHz) and an extremely stable gain with 2-dB gain bandwidth of 32%.

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