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The goal of this project is to investigate the use of vanadium dioxide in reconfigurable
microwave devices such as antennas or filters. The second phase would see the creation
of a more concrete application. The ability of vanadium dioxide (VO2) to change its
structure above a certain temperature is of particular interest. Under 68°C, VO2 behaves
like a dielectric, but when it reaches and exceeds that temperature, it behaves like a metal.
With this in mind, we wanted to demonstrate the possibility of creating a
reconfigurable FSS for spatial filtering by selectively heating the VO2 sample's surface
area. A laser was used to select which area of the sample to heat: by shaping the beam,
we were able to illuminate, and thus heat, only specific areas.
This dissertation also describes the use of the time-resolved microwave conductivity
(TRMC) technique to characterise vanadium dioxide to design these FSS images
projected on the VO2 surface. We show that TRMC is a versatile technique for
determining the electromagnetic material properties and conductivity of VO2 compounds.
This was used to compare the behaviour of several VO2 samples of varying thicknesses
and fabrication technologies.James Watt Scholarshi
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