一种具有近似对称E/H面波束宽度的SIW喇叭天线

Design of SIW Horn Antenna with Approximately Symmetrical E-H Plane Beamwidth

本文提出了一种基于基片集成波导的喇叭天线。为了提高增益,在喇叭孔径前加载椭圆型介质透镜以调整辐射波的相位;为了提高带宽,在上述透镜的上下加载同样形状和厚度的介质板,不仅进一步改善与自由空间的匹配,同时还减小了E面方向图波束宽度,使得天线E/H面波束宽度近似相等。此外,通过在介质板上加载金属柱和金属条带减弱了后向辐射,并因此提高了天线的前后比。仿真结果表明,在S_(11)小于-10 dB的情况下,该天线的带宽范围为22.2 GHz至32.3 GHz,整个工作频带内增益超过9.6 dBi,同时实现了较高的前后比以及在E面和H面较为对称的辐射方向图。

This paper presents a horn antenna based on a substrate integrated waveguide(SIW).In order to improve the gain,an elliptical dielectric lens is loaded in front of the horn aperture to adjust the phase of the radiating wave;To improve the bandwidth,a dielectric plate of the same shape and thickness is loaded above and below the above lens,which not only further improves the match with the free space,but also reduces the E-plane radiation pattern beamwidth,making the antenna E/H-plane beamwidth approximately equal.In addition,the backward radiation is reduced by loading the dielectric plate with metal pillars and strips,thus improving the antenna's front-to-back ratio.Simulation results show that with S_(11) less than-10 dB,the antenna has a bandwidth range of 22.2 GHz to 32.3 GHz and a gain of more than 9.6 dBi over the entire bandwidth,while achieving a high front-to-back ratio and a more symmetrical radiation directional pattern in the E-and H-plane.