Thermal design guidelines for high-frequency and high-power avionics

Avionic equipments, which are vulnerable to airborne radar, radio and other sources of human disturbance, always work in complex electromagnetic environment. Therefore, the structure level segregation and protection methods are significant. However, the thermal pathway of avionic equipments with high power losses can be prolonged by electromagnetic compatibility measures inevitably because of the supererogatory thermal resistance. To solve these problems, some guidelines for thermal design of high-frequency and high-power avionic equipments are presented in this paper. Additionally, to evaluate the usefulness of the thermal control guidelines, numerical simulation and physical experiment method are both carried out in the case study. The results showed that the guidelines presented in this paper were necessary and valid, and can be used as the reference for thermal design of similar avionic equipments.