Tunable Zeroth-Order Resonance in Metamaterial Transmission Lines based on Electrowetting on Dilectric
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A new approach for tuning the resonant frequency of metamaterial transmission lines (TLs) by using electrowetting on dielectric (EWOD) is presented. Coplanar Waveguide (CPW) metamaterial TLs were designed and used as digital microfludic platforms, where tunable resonance frequency was demonstrated for RF/microwave applications. A repeatable tuning mechanism was realized by exploiting the interface deformation of a liquid metal (mercury) droplet by an applied voltage. The maximum tuning range achieved is around 400 MHZ (from 3.51 GHz to 3.92 GHz) with a DC actuation voltage of 110 V.