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EXPERIMENTAL ANTENNA PERFORMANCE
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ablation materials aerospace alloys alumina Aluminosilicate aluminum Annular Slot Antenna antenna assembly antenna design Antenna VSWR ature Beryllia boron nitride braze braze material BTU/ft sec cavity ceramic characteristics coaxial coefficient of thermal columbium curves dielectric constant effect electrical properties electron beam elements evaluation frequency fused silica fused silica cup gallium gasket glass-to-metal heating rate Helical Antenna high temperature antennas inches inconel insulation Kovar Laboratory limited liquid metal loss tangent machining measurements mechanical seals metal seals minimum power handling molybdenum O-ring operation oxidation resistance plated platinum Poor Poor power handling capability pressure produce protective coating quartz radiation Radome refractory metals room temperature S-band service temperature shown in Figure shows Slot Antenna spiral antenna stainless steel stress substrate suitable superalloys surface tantalum TD nickel TEMPERATURE F Figure temperature range thermal environment thermal expansion thermal housing thermal shock thermocouple thickness thin titanium tungsten vacuum values VSWR waveguide welding window