Analysis And Optimization Of Micro-Channel Heat Sink For Active Phased Array Antenna

With the development of active phased array antenna and the increasing of the integration level of corresponding T/R modules, heat dissipation problem caused by high heat flux density and narrow heat dissipation space has been increasingly highlighted. Conventional heat dissipation means haven’t met the heat dissipation requirements of active phased array antenna in the future. According to high-density active phased array antenna, a heat dissipation method is proposed based on the micro-channel.Firstly, the analytic model of micro-channel heat sink was built, and the heat dissipation capability and the surface temperature uniformity of the micro-channel heat sink were analyzed numerically. Secondly, the experimental samples of the micro-channel heat dissipation model of an active phased array antenna was designed, the surface temperature and the difference of inlet and outlet temperature were measured and compared with numerical simulation results, and the results showed that the maximum relative error of the simulation result and the experimental result is within 12%, which proves that the simulation model is correct. Finally, an optimal method was proposed to the micro-channel heat sink of the active phased array antenna, optimal design was carried out for solving the problems that the heat dissipation capability was inadequate and the surface temperature was non-uniform, and the heat dissipation capability is improved and the optimization of the surface temperature uniformity is realized through selecting the optimal structure parameters of the micro-channel. The simulation results showed that the global thermal resistance of the optimized channel is reduced by about 20%, and the standard deviation of the surface temperature is reduced from 4.64 Kto 0.8847 K.