钻孔雷达定向天线仿真与设计

采用分布介质加载和集中电阻加载宽带小型化技术, 设计了一个四方向的定向天线. 天线中心频率处方向图前瓣增益比后瓣增益大28dB, 天线主瓣增益为5.4dB, 天线辐射的前向与后向时域脉冲波形峰峰值之比大于3, 时域电场脉冲波形拖尾小于主峰幅度1/5. 通过全向、定向钻孔雷达天线进行联合仿真, 结果表明天线定向效果明显. 为了验证天线性能, 实际加工制作了仿真的天线, 并进行测试, 测试得到的天线S11与仿真结果吻合.

Simulation and Design of Directional Antenna in Borehole Radar

A directional antenna of four directions is designed based on the broadband miniaturization technology of distribution medium load and concentrated resistance load. The gain of antenna main lobe is 5.4 dB and in the center frequency the gain of anterior lobe is 28 dB larger than the back lobe. The ratio of the peak-to-peak value of forward time-domain radiation pulse to backward time-domain radiation pulse is greater than 3. The trailing of time domain radiation pulse waveform is less than one fifth of main peak amplitude. The joint simulation of both omni-directional and directional borehole radar antennas shows that the directionality of the designed antenna is improved. The antenna is fabricated to make the test and the measured results of the antenna's S11 are consistent with the simulation results.