Investigations and prospects of Fabry-Perot antennas:a review

Fabry-Perot(FP)antennas have characteristics of planar structures combined with high gain,and they have been widely used in wireless communications.With the progress of ongoing research,FP antennas have achieved various capabilities,but many of them are still under development,such as lowprofile,wideband,circular polarization,multi-band,low-radar cross section(RCS)and reconfigurable features.This paper discusses the theoretical analysis methods and research progress of FP antennas,and explains the realization methods of different features of FP antennas.In order to indicate different technologies for realizing various capabilities,the key technologies and features of some of the latest designs are described.Finally,the research situation and prospects of FP antennas are summarized to guide their research directions in the future.

一款双频双宽带双圆极化Fabry⁃Perot谐振腔天线

文中设计了一款双频双宽带双圆极化的法布里⁃珀罗(FP)谐振腔天线。传统的FP天线具有高增益特性但是难以实现宽带及双频带工作,为了改善其性能,提出一种具有双频正相位梯度的部分反射表面,利用其正相位梯度特性弥补电磁波频率升高带来的空间相位变化,从而在较宽的带宽内满足FP天线的谐振条件以实现宽带辐射。通过加载寄生贴片以及缝隙耦合馈电的方式设计宽带圆极化馈源,并且采用人工磁导体结构替代传统的金属地板,在同一谐振腔高度下满足两个频段的谐振条件,简化了双频FP天线的结构。全波仿真结果表明,所提出的FP天线3 dB轴比带宽分别为10.1%和13.8%,峰值增益达到12.45 dBi和11.9 dBi,3 dB增益带宽分别为11.5%和14.8%。

Fabry-Perot天线设计的系统方法

利用接收工作状态模型法,对法布里-珀罗(Fabry-Perot,FP)型微带天线进行了系统方法设计与研究,并用电磁场分布理论,从全新的角度解释了FP谐振天线可获得高方向性的原因。同时,设计了包括频率选择性表面、介电常数分别为10.2和4.4的不同类别的介质板在内的3种不同盖板,并将其应用在FP天线上。在此基础上,对FP天线的辐射性能、方向性系数和增益都进行了测算和对比分析,并同时计算了其口面利用效率。