A Frequency Reconfigurable metasurface based on liquid metal

This paper proposes a frequency reconfigurable metasurface, which based on liquid metal and can continuously change its operating frequency from 2.9 GHz to 7.3 GHz. The unit cell is a two-layer structure. Arrow-shaped liquid metal microchannels and a solid metal ground plane are etched on each side of the bottom layer. By changing the length of the arrow arms, the resonance frequency can be changed. The top layer is used for sealing with 5 through-holes to the bottom layer for injection and withdrawal the liquid metal. A $5\times 5$ metasurface with the aforementioned unit cells has been fabricated to verify the frequency reconfiguration performances.