Wideband And High-Gain Circularly-Polarized L-Shaped Slot Antenna Array Using Metamaterial

This research involves a compact wideband circularly-polarized antenna array, which consists of a sequential rotating phase feed network, 2 x 2 mushroom-type metamaterial (MTM) unit, and so on. Each antenna array unit contains a microstrip feedline, an L-shaped slot antenna, and so on. The MTM-based antennas were incorporated with a sequential-phase network of sequentially rotated series-parallel feed to achieve wideband operation. The operational bandwidth and the radiation model in the high-frequency area were improved through the adjustment of spacing between the L-shaped slots while maintaining the size and structure of the MTM. The proposed design had dimensions of 80 mm x 80 mm x 3.5 mm (similar to 1.64 lambda(0) x 1.64 lambda(0) x 0.072 lambda(0) at 6.15 GHz), and it was simulated, fabricated, and tested.