Design, analysis, and reconfiguration of a multi-arm spiral frequency selective surface

Frequency selective surfaces (FSS) have a range of applications from radome design, radar cross section reduction, and minimizing electromagnetic interference - to name a few. However, after fabrication, the surface´s frequency response is static. Adding a reconfiguration mechanism to the FSS expands upon its versatility. Some common FSS tuning techniques use varactors, MEMS, and ferrite materials. However, these methods require the use of a biasing network, and only a few reconfiguration states are achievable. Fluidic tuning systems provide a viable alternative to the aforementioned methods. First, using fluidics removes the need for a biasing network. Second, by doping the base fluid with high dielectric particles a continuous spectrum of reconfiguration states is possible.