Structural Analysis of Digital Transceiver Unit (DTU) for 400kg-Class Communication Satellite Considering Launch Environment

Since Starlink’s introduction, global social and technical demands for satellite-based telecommunication systems have rapidly increased. In South Korea as well, research on communication satellites began several years ago. To realize satellite communication, both long-distance communication with ground station terminals and inter-satellite communication are essential. The digital transceiver unit (DTU), which provides beam-steering functionality to control signal directionality and concentrate emissions along specific trajectories, is one of the most critical payloads in satellite systems. This paper conducts a comprehensive structural analysis of the DTU to evaluate its stability under launch conditions. First, modal analysis was performed to verify compliance with stiffness requirements and ensure sufficient separation between the DTU’s vibrational modes and those of the satellite. Quasi-static analysis then assessed structural stability under static acceleration corresponding to design loads. Finally, random vibration and shock analyses were conducted to evaluate the reliability of EEE (electrical, electronic, and electromechanical) components on the PCB and fastener integrity. The analysis configuration modeled the DTU as integrated into the satellite system. Since environmental testing for the structural-thermal model of the satellite system remains ongoing, vibration/shock inputs followed ESA standards. Results demonstrate that the proposed DTU design meets all structural stability requirements for launch environments.