In the last few years, there has been growing interest in employing meta materials (MTMs) to enhance antenna gain. In this paper\nwe proposed a novel structure of planar folded-line left-handed meta material (FL-LHM) and applied it to improve the gain of\nthree 5.8GHz micro strip antenna types: a circularly polarized patch antenna, an antenna array, and a beam steering antenna. The\nplanar FL-LHM structure was designed based on transmission line analysis. Their scattering parameters were obtained using a\nnumerical model; the negative effective permittivity and permeability were then calculated from these parameters for the assessment\nof negative refraction index region.The S11 and radiation patterns of three fabricated antennas were measured; these results matched\nwell with the simulation.We observed that the gain was increased up to 3 dBi for all the antennas. In addition, we were also able to\nmaintain the circular polarization as well as the steering of the antenna without changing its dimensions.
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