船舶定线制水域AIS基站的等离子体八木天线

Plasma Yagi antennas on AIS base stations in ships' routeing waters

针对目前广泛使用的AIS基站发射天线的不足,提出将等离子体八木天线应用到海事智能通信领域,作为船舶定线制水域AIS基站的发射天线.该方法根据等离子体介电常数与电子密度的关系,利用HFSS构建AIS基站等离子体八木天线模型.通过改变该模型等离子体参数、无源振子个数等,对其进行方向图仿真.仿真结果表明:当关闭无源振子时,天线可作为全向天线;当增加无源振子个数和电子密度时,该天线定向性增强,方向图主瓣变窄.用该方法建立的天线可快速实现全向与定向之间的转换,显示出良好的可重构性.仿真结果证明了船舶定线制水域AIS基站使用等离子体八木天线的可行性.该方法可改善定线制水域的通信效果和海事监管能力.

To deal with the deficiency of transmitting antennas of AIS base stations,the plasma Yagi antennas are applied to the maritime intelligence communication and as transmitting antennas of AIS base stations in ships＇ routeing waters. A plasma Yagi antenna model of AIS base stations is established by HFSS according to the relationship between the plasma dielectric constant and the electron density. The patterns are simulated by changing plasma parameters and the number of passive vibrators in the model.Simulation results show that： the antenna is omnidirectional when the passive vibrators are switched off;when the number of passive vibrators and the electron density increase,the directionality is enhanced and the main lobe of patterns narrows. By the antennas built by the method,the transformation from omnidirectional antennas to directional antennas can be achieved fast. The antennas are of good reconfigurability. Simulation results prove that the plasma Yagi antennas can be used on AIS base stations in ships＇ routeing waters. It can promote the communication efficiency and the capability of maritime supervision in ships＇ routeing waters.