The proposed antenna combines a conventional patch with an artificial magnetic conductor (AMC) ground plane and a frequency selective surface (FSS) superstrate with the height of 0.35 λ0 (at f = 8.5 GHz) from the feed antenna. In this structure, to create circularly polarized waves, a FSS superstrate composed of an array of quasi-crescent shaped unit cells is used. In addition, to compact the antenna cavity, the AMC ground plane with the reflection phase of zero is utilized. Moreover, for further improvement in the antenna 3 dB axial ratio (AR) bandwidth (BW), an array of diagonal rectangular slots is used in the AMC ground plane. The proposed antenna presents an appropriate 3 dB AR in the whole BW (20%) of antenna with the gain up to 16 dBi. Due to high gain, wideband axial ratio, fabrication simplicity, and compact structure, this antenna is a promising candidate for X-band satellite communication, radar, wireless communication, and microwave power transmission.

中文翻译：

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基于 FSS 和 AMC 结构的具有 3-dB 宽轴向比带宽的紧凑型法布里-珀罗天线

所提出的天线将传统贴片与人造磁导体 (AMC) 接地平面和频率选择表面 (FSS) 覆层相结合，距离馈电天线的高度为 0.35 λ0（在 f = 8.5 GHz）。在这种结构中，为了产生圆偏振波，使用了由一系列准新月形晶胞组成的 FSS 覆层。此外，为了紧凑天线腔，使用了反射相位为零的AMC接地层。此外，为了进一步提高天线 3 dB 轴比 (AR) 带宽 (BW)，在 AMC 地平面中使用了对角矩形缝隙阵列。建议的天线在天线的整个 BW (20%) 中呈现适当的 3 dB AR，增益高达 16 dBi。由于增益高、轴比宽、制作简单、结构紧凑，