| dc.description.abstract | The Low Earth Orbit Terminal(LEO Terminal) is used to transmitting and receiving signals from low earth orbits satellites.Since the long distance of transmission links, Terminal mount, antenna and integrated circuit (IC) whose size will shrink due to the employed high frequency, causes Terminal increase the operating temperature, affect the performance.
This research uses natural convection to design the heat dissipation structure, draws the heat dissipation structure through 3D design software, and uses thermal simulation program Flow Simulation for analysis. The purpose is to reduce the temperature of the Terminal case and IC below 60°C and 85°C, respectively, The overall weight should be controlled within 15kg, 4 types of Terminal were analysis to obtain the best design of the Terminal heat dissipation structure, namely TypeA: IC spacing difference, TypeB: heat dissipation result of aluminum heat sink, TypeC: heat dissipation result of aluminum heat sink elongation, TypeD: copper clad aluminum heatsink.
The research results of this paper show that when the distance of the antenna and the IC is designed to be high density, there will be a problem of higher operating temperature.The heat sink structure does not exceeds the Terminal size, the maximum temperature of the IC will be controlled within 85°C. By copper clad aluminum heatsink, the temperature can be further reduced, and the heat spread is more uniform, which is conducive to heat transfer, but the weight will increase and the processing method will be more complicated. Designers can consider whether to copper clad aluminum heatsink according to temperature and weight requirements. when the heat sink structure exceeds the Terminal size, the lowest IC temperature of all types can be obtained. The research results provide designers with different design requirements as a reference to make The Terminal reaches optimum operating temperature. | en_US |