Mr. Jan-Olof Ousback Profile

Jan-Olof Ousback

at Swedish Defence Research Agency

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Proceedings Article | 29 September 2006 Paper

Microwave properties of thermochromic metal oxide surfaces

Jan-Olof Ousbäck, Hans Kariis

Proceedings Volume 6401, 64010L (2006) https://doi.org/10.1117/12.689768

KEYWORDS: Microwave radiation, Reflection, Vanadium, Calibration, Reflectivity, Metals, Oxides, Transition metals, Infrared radiation, Antennas

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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.

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