电阻加载半椭圆偶极子天线的设计与研究

针对实际工程应用中安装在探测车底部的表层穿透雷达的需求,设计了一种基于电阻加载技术的超宽带低背腔半椭圆偶极子天线。该天线由一对半椭圆臂组成并通过分布式连续电阻加载有效地改善了输入阻抗特性,展宽了天线的工作带宽。结合应用环境,评估了天线离地高度以及载体探测车对天线性能的影响,在理论分析的基础上设计并制作了一副天线样机,安装在探测车上,在外场进行了实验。仿真和实测结果表明,所设计的天线具有较低的电压驻波比和良好的辐射特性以及较小的振铃,能够满足车载表层穿透雷达的需求。

Design and study of resistor-loaded half-ellipse antenna

An ultra-wideband resistor-loaded half-ellipse antenna with a shallow cavity for the vehicle-mounted Ground Penetrating Radar(GPR) is designed. The antenna with a pair of half-elliptical-shaped arms which is loaded by continuous resistive elements can effectively improve the input impedance characteristics and expand the bandwidth. The vehicle-mounted GPR for the exploration of lunar subsurface is taken as the background. The performance of the proposed antenna with different height above ground surface is studied, and the influence of the vehicle to the antenna is analyzed. An antenna prototype was manufactured and mounted on a vehicle and field tests were done. The simulated and measured results show that the designed antenna has a low voltage standing wave ratio, good radiation characteristics and small late-time ringing, which can satisfy the requirements of the GPR system.