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29 September 2006 Microwave properties of thermochromic metal oxide surfaces
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Thermochromic metal oxides with a Mott transition, such as vanadium dioxide (VO2) exhibit an extensive alteration in their infrared reflectivity when heated above the transition temperature. For VO2 the infrared reflectivity increases as the material becomes more metal-like above the transition temperature at 68°C. Given these dynamic electromagnetic properties in the IR-range, it is interesting to study the reflection of the material also in other wavelength ranges. The microwave properties of VO2 as a function of temperature have been investigated here. Measurements were made with an automated network analyzer combined with an electrical heating unit. Reflection properties of VO2 in the microwave region were determined. Above the transition temperature, an increase in the reflection of the surface was observed. The VO2 became more metal-like in the whole measured microwave frequency range, as in the infrared region. It is concluded that VO2 not only can be used to adapt the thermal emissivity of a surface but also to control the microwave reflectivity. Possible applications are switchable radomes, switchable radarabsorbers and heat protection for antenna apertures.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jan-Olof Ousbäck and Hans Kariis "Microwave properties of thermochromic metal oxide surfaces", Proc. SPIE 6401, Optical Materials in Defence Systems Technology III, 64010L (29 September 2006);

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