A Tunable Metamaterial Absorber Based on Liquid Crystal Intended for F Frequency Band

A tunable metamaterial absorber based on the liquid crystal intended for F frequency band is presented. The proposed absorber was analyzed both numerically and experimentally. The conducted analysis has shown that the bias voltage affects the orientation of the nematic liquid crystal embedded in the mesh voids and causes the resonant frequency shift from 110.9 to 103.8 GHz with the frequency tunability of 6.4%. The absorptivity of the proposed absorber was measured, and it was higher than 90% for all bias voltages. Therefore, the proposed absorber provides a new opportunity in development of tunable sensors and absorbers.