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板状天线作机械下倾的目的是为了实现主波束的下倾，形成伞型场，同时也克服了直立式天线零辐射点多的弱点，本文通过建立机械倾斜式天线的垂直方向性函数来讨论它的一些特点。
The purpose of slab antenna for mechanical downtilt is to realize the downtilt of the main beam to form an umbrella field and to overcome the weak points of the upright antenna with zero radiation point. By establishing the vertical directivity function of the tilted antenna, Discuss some of its features.