双信道应答器多天线互耦分析及改进

Mutual Coupling Analysis and Improvement of Multi-antenna in Dual-channel Balise

由于双信道应答器内部空间有限,天线单元之间距离很小。应答器内部的多天线间通过磁场发生耦合。即互感耦合,在相邻两天线近场之间引入互感,导致敏感天线的阻抗发生变化,是一种不期望的干扰。多天线间的互耦降低了天线的独立性,影响了天线的性能,增加了天线调谐的难度。互耦影响因素包括天线间距离、重合面积和不同工作频率的天线排列顺序等。为降低多天线间的耦合系数,提出增大天线间的距离、降低天线间的重合面积、重新排列不同工作频率天线位置等方法。仿真结果表明,上述方法提高了天线间的隔离度,降低了耦合系数。

Due to the limited inner space of the dual-channel balise,the distance between the two adjacent antennas is close.The multi-antennas of the balise suffer from coupling,caused by magnetic field.The magnetic coupling,called mutual inductive coupling,introduces mutual inductance in the near field region between the two closely-packed antennas.This mutual inductance causes a change in the impedance for the sensitive antenna,which is unexpected interference.The mutual coupling between the antennas reduces the independence of the antennas and affects the performance of the antennas,which increases the difficulty of antenna tuning.The parameters influencing the mutual coupling of the multi-antennas include but are not limited to the distance between the antennas,their overlapping area,and their arrangement order.In order to decrease the coupling coefficient of the multi-antennas,the paper proposed to decrease the overlapping area,increase the distance between the two adjacent antennas and re-sequence the antenna order.The simulation results indicated that these proposed changes increased the isolation of the multi-antennas and decreased their coupling coefficient.