一种用于星载多波束相控阵的稀疏阵列

A sparse array for satellite-borne multi-beam phased array

现有的技术较难满足星载多波束相控阵天线射频前端的通道间距,已有的研究工作大量集中在提高射频电路和芯片的集成度,提出采用稀疏布阵的方式来增加天线单元的平均间距,从而缓解现有技术条件下的高密度集成难题。设计了Ka频段八波束相控阵天线的稀疏布阵阵面,首先采用遗传算法优化设计64元稀疏子阵,子阵增益在±60°扫描范围内大于18.6 dB,该子阵沿4个象限镜像对称,便于高效设计将不规则分布的天线单元端口与规则排布的R组件端口进行互连的带状线转接板,然后随机旋转、平移36个子阵拼接成全阵,在一定程度上打乱子阵分布均匀性,以起到栅瓣抑制的作用。该方法具有简单、高效、快捷的优点,稀疏阵列的设计结果基本能满足工程应用需求,适用于星载多波束相控阵。

The existing is difficult to meet the channel spacing of the RF front-end of the satellite-borne multi-beam phased array antenna.The existing research work focuses on improving the integration of RF circuits and chips.A sparse array is proposed to increase the average spacing of the antenna elements,so as to alleviate the high-density integration problem.The sparse array of Ka-band eight-beam phased array antenna is designed.Firstly,genetic algorithm is used to optimize the 64-element sparse subarray,and the subarray gain is greater than 18.6 dB over the±60°scanning range.The subarray is mirrored symmetrically along the four quadrants,which is convenient for the efficient design of the stripline transition board that interconnect the irregularly distributed antenna unit ports with the regularly arranged R module ports.Then 36 subarrays are randomly rotated and translated to form the full array.To some extent,the distribution uniformity of the subarray is disturbed to suppress the grating lobe.The method proposed is simple,efficient and fast.The design results of sparse array can basically meet the requirement of engineering applications,and is suitable for satellite-borne multi-beam phased array。