镜象和非镜象型喇叭NRD漏波天线的研究

A development of image and unimage horn NRD leaky wave antennas

为了克服一般无辐射介质波导漏波天线(简称 NRD 漏波天线)在 xoz 平面上有两个对称大瓣的缺点,也为了提高天线的增益,作者曾提出在天线口面上加喇叭的方法,称为喇叭 NRD 漏波天线。本文从理论上解出了当喇叭张角较小时(不大于50度)喇叭 NRD 漏波天线的复传播常数,从而可以设计天线。文中给出了根据理论结果计算的相位常,数β及衰减常数α随喇叭张角θ_0及介质条位置 d 的关系曲线。理论计算数据及实验结果符合良好。本文并提出了镜象型喇叭 NRD 漏波天线的方案,使天线的面积及体积大大减小,也解决了介质条的安装及固定的问题,将这种天线向实用化推进了一大步。同样也求出了镜象型喇叭 NRD 漏波天线的复传播常数,并得到了实验验证。

To overcome the disadvantage of having two grid lobes in the xoz- plane of general NRD (Non-radiative dielectric waveguide) leaky wave antenna and increase the gain of antenna,a horn NRD (HNRD) leaky wave antenna is deve- loped.The complex propagation constants of HNRD leaky wave antenna are solved for the case that the angle of horn is not greater than 50°,and the antenna can be designed In addition,an image form of NRD and HNRD leaky wave antenna are propo- sed,so that the area and volume of antenna are greatly decreased and the mounting and fitting of dielectric strip become very easy.The numerical results ot phase constants and leakage constants versus verious paramaters of antenna are calculated according to this theory.The theoritical results are in a good agreement with the experimental data.