Ultrathin miniaturized meta-surface for wide band gain enhancement

In this paper, a low profile ultra thin miniaturized meta-surface is used to enhance radiation and transmission characteristics of wide frequency C-band radiator. The used planner meta-surface consists of double annular ring resonator with metallic serrations having measured wide pass band characteristic from 4.25 GHz to 8.0 GHz with transmission bandwidth of 3.75 GHz. The size of meta-surface unit cell is 0.166λ × 0.166λ with planner meta-surface thickness of 0.011λ making meta-surface ultrathin and compact. The meta-surface is placed over microwave radiator at an optimum height causing radiation convergence resulting into wide band gain enhancement of 1.5 dB to 6.75 dB from 4.35 GHz to 7.45 GHz with a wide enhanced gain bandwidth of 3.15 GHz. The radiation and transmission characteristics of MS at different height with wide frequency C-band radiator are measured and optimum height is selected. A highest gain enhancement of 6.75 dB is obtained at 5.4 GHz.