ABSTRACT This paper reports a novel differentially driven circularly polarized metasurface-based antenna with symmetrical and unidirectional radiation pattern. The introduction of metasurface could generate an additional resonance. The location of lower resonant frequency could be tuned independently by varying the length of cross gap in the ground plane while the higher resonant frequency is insensitive to this change. In addition, it is also proved that the circularly polarized performance could be better using the nonuniform metasurface than the uniform one. Furthermore, an antenna prototype has been fabricated to experimentally validate the principle and design approach. The measurements agree reasonably with the simulated ones.

中文翻译：

---

非均匀超表面加载圆极化差分馈电天线

摘要 本文报道了一种新型差分驱动圆极化超表面天线，具有对称和单向辐射模式。超表面的引入可以产生额外的共振。通过改变接地平面中交叉间隙的长度，可以独立调谐较低谐振频率的位置，而较高谐振频率对这种变化不敏感。此外，还证明了使用非均匀超表面比使用均匀超表面的圆偏振性能更好。此外，还制作了天线原型，以通过实验验证原理和设计方法。测量结果与模拟结果合理一致。