基于有源单元方向图等效法的弹载相控阵天线互耦补偿

Mutual Coupling Compensation of Missile-loaded Phased Array Antenna Based on Active Element Pattern Equivalent Method

弹载相控阵天线单元间互耦会使方向图失真,导引头制导性能下降,提出将有源单元方向图等效法应用到导引头上的相控阵天线方向图计算中。仅第n个天线单元以单位幅度源馈电、其余所有单元接匹配负载,获得消除互耦的有源单元辐射场,利用小型阵列的单元辐射场来等效大型阵列中相似环境下的单元辐射场,进而利用叠加定理计算大型阵列的总辐射场,建立弹载相控阵天线方向图计算模型。仿真和远场暗室实验结果表明源单元方向图等效法可以有效消除互耦对方向图的影响,说明可以应用于工程实践中。

The mutual coupling between the missile-loaded phased array antenna elements distorts the pattern,and it causes the guidance performance of the seeker to decreases.The active element pattern equivalent method was proposed to the calculation of the missile phased array antenna pattern on the seeker.Only the nthantenna unit was fed by a unit of amplitude source,and all the remaining units were connected to the matched load to obtain a radiation field of the active unit that eliminates mutual coupling.The unit radiation field of a small array took the place of the unit radiation field in a similar environment of a large array,and then the superposition theorem was used to calculate the total radiation field of the large array,and the mutual coupling between the elements was eliminated.The calculation model of the missile phased array antenna pattern was established.The simulation and far field chamber experiments show that the calculation model can effectively eliminate the influence of mutual coupling on the pattern,indicating that the active pattern equivalent method can be applied in practice.