Topological Optimization Design of Flow Channel for High-temperature-resistant Liquid Metal Frequency Selective Surface

A double-layer frequency selective surface (FSS) structure based on liquid metal with high temperature resistance is proposed for the high temperature resistance and stealth requirements of high-speed aircraft. Firstly, the double-layer FSS structure is optimized by particle swarm optimization to ensure the electrical performance of the double-layer FSS unit. Secondly, the liquid metal is used as conductive and heat conducting medium, and the flow channel structure of FSS is optimized by topology optimization method to improve the heat dissipation capacity of FSS. Finally, numerical simulation is carried out for the FSS structure before and after optimization, and the heat dissipation performance of the processed samples is tested. The coincidence between simulated temperature data and measured temperature data is good, which indicates that the heat dissipation performance of the double-layer FSS structure after topology optimization is improved.