介质埋藏平面蝶形天线的设计

Design of a Dielectric Embedded Planar Bow-Tie Antenna

采用了介质埋藏的形式将平面蝶形天线埋藏于介质中,并设计了渐变的平面微带巴伦给平面蝶形天线馈电,实现了不平衡到平衡的转换;还设计了三角形微带巴伦和微带传输线一起的结构形式,进行阻抗匹配。使用电磁仿真软件Ansoft HFSS对该天线进行了优化设计和仿真实验,与制作的实物天线性能进行对比。仿真和实测结果表明,该天线S11≤-10 d B仿真的相对带宽达到88.7%而实测的相对带宽为79.3%,具有超宽带特性;在工作频率处,仿真增益为6.9 d B,实测增益为5.8d B。该天线满足某工程项目的需要,可作为探地雷达系统的收发天线。

The planar bow- t ie antenna employing the form of dielectric embedded is buried in the sub-strate. A tapered planar microstrip balun is designed so as to achieve transforming unbalance to balance. In order to realize impedance matching,the structure of triangular microstrip balun with microstrip transmis-sion line is designed. The designed antenna is simulated and optimized by Ansoft HFSS and compared with fabricated physical object. Simulated and measured results show that the relative bandwidth reaches 88. 7%,while the measurement is 79. 3%,which has the ultra-wideband （ UWB） characteristics. At the working central frequency,the gain is up to 6. 9 d B,while the measurement is 5. 8 d B,which meets the need of a certain project and can be applied in the receiving and transmitting antenna of ground penetrating radar system.