耦合激励系数及对称振子阵列天线的有源方向图研究

The active element pattern of dipole array and coupling excited coefficient

为了深入探讨相控阵天线单元间的耦合对阵中单元方向图的影响,以阵列天线单元S参数为基础,给出了阵列天线单元的耦合激励系数计算公式,利用阵列天线单元间的耦合激励系数分析计算阵中单元的有源辐射方向图.同时利用矩量法分析由偶极子单元组成的阵列,并把阵列中每个单元的感应电流幅度和相位与耦合激励系数的幅度和相位进行比较,二者数据基本一致.矩量法计算的单元有源方向图与本文提出方法的计算结果吻合良好,验证了本文给出的阵列耦合激励系数及阵列天线阵中单元有源方向图计算方法的可靠性.

In order to deeply discuss the influence of coupling between phased array antenna elements on active element pattern,based on the S-parameter of the array antenna,the calculation formula of the coupling excited coefficient of the array antenna element is given.Then,the active element patterns are simulated by using the coupling excited coefficient.Two linear dipole array antennas are analyzed with method of moment(MoM)for verifying the amplitude and phase of the coupling excited coefficient with the induced current.The active element patterns simulated by the proposed method agree with the results by MoM very well.The formula for acquiring coupling excited coefficients is effective to analyze the active element patterns.