In this paper, a narrow-band circularly polarized (CP) microstrip leaky-wave antenna (LWA) with open stopband suppressed is proposed. Coupled meandered slow-wave lines are adopted to realize narrow-band beam scanning. The asymmetric elements are employed as radiators to realize CP and zero-crossing scanning. We modulated the antenna by loading the ground inductance and asymmetric capacitors on the meandered slow-wave transmission line. The antenna consists of ten asymmetrical structural elements connected by coupling, the antenna size of L × W is 170 mm × 25 mm. In the operating band of 8.1 to 8.5 GHz, the measured scanning angel of the fabricated antenna is from −31°to +6°. The antenna axial ratios (ARs) are all below 3 dB at the corresponding beam directions. The gain is above 9.1 dBi and the relative bandwidth is only 4.8%. In the operating band, the radiation efficiency is above 60%. It has potential applications in radar detection and wireless communication systems for its simple and low-profile structure with CP, beam-scanning, and narrow-band performance.

中文翻译：

---

一种抑制开阻带的窄带圆极化漏波天线

在本文中，提出了一种具有开放阻带抑制的窄带圆极化（CP）微带漏波天线（LWA）。采用耦合弯曲慢波线实现窄带波束扫描。采用非对称元件作为辐射器实现CP和过零扫描。我们通过在蜿蜒的慢波传输线上加载接地电感和不对称电容器来调制天线。天线由十个非对称结构元件耦合连接而成，天线尺寸L×W为170mm×25mm。在 8.1 至 8.5 GHz 的工作频段内，所制作天线的实测扫描角为 -31° 至 +6°。在相应的波束方向，天线轴比 (AR) 均低于 3 dB。增益高于 9.1 dBi，相对带宽仅为 4.8%。在工作频段，辐射效率在60%以上。由于其具有CP、波束扫描和窄带性能的简单和低剖面结构，它在雷达检测和无线通信系统中具有潜在的应用。