Power Tolerance Test and Analysis of an End-fire Array Antenna

The power tolerance performance is a core indicator for the engineering application of high-power transmitting antennas. Aiming at the thermal management challenges of end-fire array antennas under high-power working conditions, this paper proposes a multi-physics collaborative analysis method of "simulation-test-correction". An end-fire array antenna is encapsulated by co-curing process, and its complex coupling structure with over 60 elements leads to low heat dissipation efficiency. The thermal simulation model is calibrated by the measured data of the antenna in a 30℃ anechoic chamber, and it is found that the matching resistors have an overheating risk (the theoretically calculated maximum temperature is 217℃) in a 70℃ environment. An equivalent test platform is built based on the installation environment, and the severe working condition screening technology is used to determine that the 5.6GHz/0° phase is the most severe working point. Through the temperature monitoring of the 30-minute continuous power transmission test combined with simulation analysis, it is verified that the temperatures of internal materials of the antenna are all lower than the temperature resistance thresholds. The research shows that the power tolerance capability of the antenna is collaboratively affected by the transmission efficiency, packaging structure and heat dissipation environment, and optimizing the gain efficiency and forced air cooling design can significantly improve the thermal management performance. This study provides a complete test verification system for the engineering design of high-power antennas.