Diamond Supported Helix for Millimeter Wave.
Final technical rept. Aug 77-Sep 78,
HUGHES AIRCRAFT CO TORRANCE CALIF ELECTRON DYNAMICS DIV
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The thermal properties of materials, that can be used for high power helix structures, were evaluated experimentally with equipment that incorporated an infrared microscope for temperature measurements. The interface heat transfer properties between such materials were measured as a function of contact pressure and for different surface finishes. In addition the thermal conductivity of suitable ceramic materials, such as anisotropic Boron Nitride, Beryllia and Diamond was measured as a function of temperature. Millimeter wave helix structures for 40 GHz to 50 GHz were constructed for thermal evaluation with these materials. A power handling capability of 165 wattsin. with an average helix temperature of 380C was demonstrated with a diamond supported helix structure, indicating that helix traveling-wave tubes can be designed for RF-power levels of 100 watt to 200 watt in the 40 GHz to 50 GHz range using such a structure. Author
- Electrical and Electronic Equipment
- Ceramics, Refractories and Glass