基于地基预警雷达的中段反导任务需求，首先，介绍了当前美国两类典型的X波段相控阵天线的系统架构、天线规模、扫描范围等特点；然后，从应用场景和波瓣性能分析比较了二者的区别；最后，介绍了一个采用高密度集成、大范围电扫体制的X波段相控阵天线工程实例。

Base on anti-missile defense mission of early warning Ground-based radar, firstly, the characteristics of two X-band phased arrays in USA are introduced, include system constitution、antenna scale、scanned area; secondly, the different of the two radars' application scenarios and beam performance is analysis. Finally, a X-band phased array in engine example is given, the array uses superintegration and big electronic scanning area.

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