A pattern-reconfigurable Yagi–Uda antenna based on liquid metal is presented. The consists of a balun-fed active dipole and pair stretchable passive parasitic dipoles, which are implemented by eutectic gallium-indium (EGaIn) alloy embedded in microfluidic channels. dipoles driven at each end two low-cost, three-dimensional printed media rods. Afterward, spinning the rods different angles leads ...