Research On Heat Design Of Solid-state Active Phased Array Antenna

Active phased array antennas are broadly adopted by advanced radar systems at home and abroad nowadays. A large number of solid-state active T/R components as well as power systems are installed in the active array plane, causing the plane to have high assembly and thermal power density. As a core device in the phased array antenna, T/R component has strict requirements on temperature. So efficient and reliable heat elimination technology has always been a key to the development of phased array radars.This paper has researched into the thermal design of some type solid-state active phased array antenna. First, the forced air cooling system design is proposed according to heat flux. Different flow channel parameters, radiator parameters, the array temperature under different cooling gas velocities and flow pressures are studied using computer-aided simulation techniques. Optimized parameters are derived and the model is put under air cooling experiment. Conclusion is drew that forced air cooling can meet the requirement of staying under maximum temperature(70℃), but has poor thermal stability on the array plane. According to this conclusion, the other scheme is proposed: liquid cooling system. Heat transfer parameters are calculated,Water circuit structure is designed and test equipments are produced such as cold plate. After experimental verification, all technical specifications are well fulfilled. Detailed comparison is done between the two schemes and the pros and cons are discussed in this paper. Liquid cooling system is chosen as the optimum scheme.Summaries and follow-up work are give at the end of this paper.