相控阵天线的耦合激励系数及盲点研究

Analysis of Excited Coefficient and Blindness Spot in a Phased Array Antenna

为了深入探讨相控阵天线单元间的相互耦合,以阵列天线单元S参数为基础,分别分析了振子形式辐射单元和缝隙形式辐射单元组成阵列的辐射单元之间的耦合关系,并利用天线单元的耦合激励系数分析计算了阵中单元的有源辐射方向图。对阵列中每个单元的耦合激励系数的幅度和相位进行了分析,发现平行排列单元和轴向排列单元的耦合激励系数的相位存在差异,平行排列时激励单元与相邻单元间的相位相差较小,这种差异是阵列产生盲点的主要因素。

For analyzing the mutual coupling between the elements in a phased array deeply,a dipole array and a slot array are studied separately.The S-parameter of the element in an array antenna is applied to analyze the relationship between the elements.The active element patterns are simulated by using the coupling coefficient.The amplitude and the phases of the coupling coefficient are studied.It is found the phase of the coupling coefficient are different when the dipoles(or slots)are arranged in parallel format and tandem format.It is the main reason that blindness spot appears.