强耦合发射阵的电磁兼容分析

Analysis of EMC on the Strong-coupling Transmitting Array

对于强耦合有源相控阵,其阵中单元存在共模和差模两种辐射模式,为减小共模辐射对发射系统的干扰,本文从奇偶模理论出发,对阵中单元天线的辐射模式进行分解,得到与发射系统输出相关的奇模阻抗和奇模辐射功率,其意义在于实现了强耦合阵列端口两种有源阻抗分离,从而为单元端口匹配提供了理论支持;本文最终以3×3强耦合阵为例,用一种180°混合巴伦对耦合天线奇、偶模进行物理分解,并进行了阻抗匹配设计,实验结果表明,该方法有效降低了系统中的共模干扰,对一般有源阵列电磁兼容分析及工程应用具有参考意义。

For strong coupling active phased array,the array cells exist two kinds of radiation pattern,common-mode and differential-mode,in order to reduce common-mode interference radiation on the transmitting system,this article embarks from the theory of odd-even mode,against the radiation pattern of the antenna unit decomposition to obtain the odd-mode impedance and radiation power,its significance lies in the realization of the strong coupling array ports two kinds of active impedance separation,which provide the theoretical support for unit port matching; This article finally 3X3 strong coupling array,for example,in a 180 degree hybrid balun to separate odd-mode and even-mode for coupling antenna,and carries out the impedance matching design,the experimental results show that this method is effective in reducing the system common-mode interference,and gives a reference value of EMC analysis and engineering application for general active array.