一种用于高速公路探地雷达的新型时域超宽带TEM喇叭天线

Novel Time-domain Ultra-wide Band TEM Horn Antenna for Highway GPR Applications

基于传输线理论和阻抗渐变思想,采用指数渐变结构及加载技术,对应用于高速公路探地雷达的超宽带TEM喇叭天线进行了设计和优化,分析了不同延展面条件下的驻波特性,应用金属反射腔和分布式电阻加载,进一步改善天线性能,并根据最佳仿真结果制作了一副天线。天线的测试结果表明:该TEM喇叭天线在0.9–12.6 GHz的带宽内电压驻波比小于2,波形保真性好。应用于高速公路探地雷达,取得了较好的效果。

Based on transmission line theory and impedance transition, we design an ultra-wideband Transverse Electro Magnetic（TEM） horn antenna that takes advantage of index gradient structure and loading techniques and is optimized for highway Ground Penetrating Radar（GPR） applications. We use numerical simulation to analyze the effects of different curved surfaces as an extension of the antenna and further improve the antenna performance by the use of a metallic reflective cavity and distributed resistor loading. We then fabricated an antenna based on the optimization results and determined the Voltage Standing Wave Ratio（VSWR） of the antenna to be less than 2 for bandwidths ranging from 0.9–12.6 GHz. The waveform fidelity of the antenna is also good and when we applied this antenna to highway scenarios, it achieved good results.