A multifunctional frequency selective rasorber based on hybrid microfluidic-electronic control

In this paper, a multifunctional frequency selective rasorber (FSR) based on hybrid microfluidic-electronic control is presented. The proposed FSR consists of a photosensitive resin-based microfluidic channel and an active frequency selective surface. The lossy layer utilizes the special properties of water (dispersion characteristics, fluidity), and has great advantages in low profile, multifunction, and low costs. Four different responses are realized by the combination of two independent control systems, which provide more degrees of freedom for manipulating electromagnetic waves. In addition, the distribution of electric fields and power loss densities are thoroughly analyzed to derive the physical properties of the proposed structure. Finally, a multifunctional FSR is fabricated and measured, and the simulated and tested results are in good agreement. The proposed structure performs under different polarizations and incident angles (up to 30 degrees), which ensures the stability and security of the communication system in complex environments.