对基于矩形阵列的高功率微波二维密集阵阵列合成进行了研究。仿真分析了均匀矩形栅格阵列的远场方向图，结果表明采用密集阵可以实现高效的、具有确定主波束的空间功率合成。并分析了阵元间距及阵元初相位对阵列空间功率合成的影响，结果表明：阵元间距越小，栅瓣越少，主波束宽度越宽，具有确定主波束的临界距离越小；当目标高度超过阵临界距离时，阵元初相位相差越小合成效率越高，阵列初相位分布范围超过π/2时，阵列得不到确定的主波束，进行阵列设计时应充分考虑阵元间距及初相位对阵列合成的影响。

The rectangular closepacked antenna array is studied in the paper. The farfield directional diagram of the array is emulated, which indicates it is possible to get highly active combination based on the closepacked antenna array and the main beam can be got. Then the impact of element separation and initial phase of the element on spatial power combining of the antenna array is analysed, and the results show that the smaller the element separation is, the less the grating lobes becomes, and the wider the main beam is, the shorter the critical distance becomes when the main beam can be obtained. When the distance between the target and the arrays exceeds the critical distance, the synthesis efficiency increases with the decrease of the phase difference of the arrays. But the arrays can’t obtain certain main beam when the distribution range of initial phase of the arrays exceeds π/2. So the above factors should be considered in array design.