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This article presents an integrated design of active phased array for low-altitude detection radar. Integrated design is an important method to realise miniaturisation and low cost. The multifunctional integrated chip technology is used to design the tile-type transmit/receive module. The whole array is divided into subarrays for modularisation. In addition, in order to be integrated with active circuits, a wide-beam and silicon-based antenna is proposed and verified.