相控阵天线微流道液冷优化设计及性能研究

Optimization design and performance research on microchannel liquid cooling of phased array antenna

相较于风冷、相变等散热方式,液冷具有稳定、效率高等优势,是目前相控阵天线散热的首选方式。针对等截面平直流道相控阵天线冷却不均匀、收发(transmitting/receiving,T/R)组件温差大的突出问题,与以往部件级热控设计方法不同,本文首次提出了相控阵天线整机热控设计思路,设计了变截面平直流道和双螺旋流道两种优化结构。仿真和实测结果表明,双螺旋结构流道冷却效果最优,优化后芯片最高温度降低了35.6%,T/R温差降低了51.8%。此外,所提方法成功量化给出了流速对冷却效果的影响,可有效解决大功率有源相控阵天线热控设计难题,可行性和实用性强。

Liquid cooling becomes the first choice for heat dissipation of high power phased array antenna because of its higher stability and efficiency than other ways like air cooling or energy-storage by phase change.Different from previous unit-based thermal control methods,this paper provides a new thermal control design idea for phased array antenna by two kinds of optimized structure,i.e.,straight channel with variable section or dual spiral channel,to solve critical problems like cooling unevenness,great temperature difference between transmitting/receiving(T/R)elements occurred in phased array antenna with constant cross section and straight microchannel.Simulation and test result show that dual spiral channel enjoys the best cooling effect.Maximal chip temperature decreases by 35.6%and the temperature difference between T/R decreases by 51.8%.Besides,influence of fluid speed on cooling effect is given with its quantized curve.Thus critical problems of phased array antenna thermal control can be settled with strong feasibility and practicability.