This research involves a compact wideband circularly-polarized antenna array, which consists of a sequential rotating phase feed network, 2 × 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 × 80 mm × 3.5 mm (~1.64 λ0 × 1.64 λ0 × 0.072 λ0 at 6.15 GHz), and it was simulated, fabricated, and tested.

中文翻译：

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采用超材料的宽带高增益圆极化L型缝隙天线阵列

本研究涉及紧凑型宽带圆极化天线阵列，由顺序旋转相位馈电网络、2×2蘑菇型超材料（MTM）单元等组成。每个天线阵列单元包含一条微带馈线、一个L型缝隙天线等。基于 MTM 的天线与顺序旋转的串并联馈电的顺序相位网络相结合，以实现宽带操作。通过调整 L 形槽间距，在保持 MTM 尺寸和结构的同时，提高了高频区的工作带宽和辐射模型。提议的设计尺寸为 80 mm × 80 mm × 3.5 mm (~1.64λ0× 1.64λ0× 0.072λ06.15 GHz），并对其进行了仿真、制造和测试。