Fluidic tuning of a frequency selective surface based on a four-arm Archimedean spiral

This paper investigates the effects of changing the superstrate above a sub-wavelength Archimedean spiral frequency selective surface. The first part of the paper outlines the design procedure taken to create the FSS geometry for both the band-pass and band-stop. The effects of adding a PDMS bonding layer and a fluidic channel layer above the FSS are investigated and the addition of these layers requires a retuning of the spiral topology. The final part of the paper discusses the effects of dynamically tuning the resonant frequency by changing the effective dielectric constant of the fluids in the superstrate.