Influences of Diamond Material on Heat Dissipation Capabilities of Helical Slow Wave Structures
From theoretical calculations, simulations, and emulations, as well as laboratory testing, we evaluated the influences of both diamond and diamond film coated support rods, as well as diamond film coated helices, on the heat dissipation capabilities of slow wave structures (SWSs) A comparison between the experiment and simulation data shows that the computer simulation results are in good agreement and offer an important reference for the application of diamond in SWSs. An expression for the coefficient of thermal conductivity for the helix material and for the support rod material indicates that the greater their value, the better the heat dissipation capability of the helical SWS. The simulation and emulation analysis results show that when the helix reaches the same temperature, SWSs made of diamond film coated support rods and helix are able to consume 20% 60% more heating power than normal SWSs. Similar to a purely diamond support rod, a diamond film coated helix and support rod are able to improve the heat dissipation capabilities of SWSs effectively. In experiments, we tested the heat dissipation capabilities of SWSs with their helix surfaces plated with high performance gold/copper films and BeO/BeN support rods. The experimental results agree well with the ANSYS simulation and emulation results.
IEEE Transactions on Electron Devices