高增益Fabry-Perot谐振腔锥状波束天线

High-gain Fabry-Perot Antennas with Conical Beam

锥状波束天线是一种方向图最大增益方向与天线法线呈一定角度,围绕法线轴向对称的天线,广泛应用于车载卫星通信、射电天文等工程中。本文提出了一种基于Fabry-Perot谐振腔的高增益锥状波束天线。将漏波理论和EBG天线理论相结合,设计了一种具有牛眼缝隙FSS覆盖层的腔结构,该结构在特定的缺陷频率下谐振。通过使用径向波导180°E形弯头的结构设计,中间放置馈电探针,馈电后激励起径向波导的TEM模式控制孔径分布,以实现期望的增益和旁瓣水平。通过优化设计,使得该锥状波束天线在中心频率12.5GHz时,产生仰角30°的锥状波束,阻抗带宽为2.2%,天线增益14.3dBi。

Conical beam antenna is an antenna with the maximum gain direction of the directional pattern at a certain angle to the normal of the antenna,which is symmetrical axially around the normal.It is widely used in engineering such as vehicle satellite communication and radio astronomy.This article proposes a high gain conical beam antenna based on Fabry Perot resonant cavity.Combining leaky wave theory with EBG antenna theory,a cavity structure with a bull eye gap FSS coverage layer was designed,which resonates at a specific defect frequency.By using a radial waveguide 180°E-shaped bend structure design,with a feeding probe placed in the middle.After feeding,the TEM mode of the radial waveguide is excited to control the aperture distribution,achieving the desired gain and sidelobe level.By optimizing the design,the conical beam antenna generates a conical beam with an elevation angle of 30°at a center frequency of 12.5GHz,an impedance bandwidth of 2.2%,and an antenna gain of 14.3dBi.