A Gravity Tailored Broadband Metamaterial Absorber Containing Liquid Dielectrics

In this paper, we present a novel type of tunable gravity tailored metamaterial absorber (TGTMA) which can obtain a broadband absorption. Both seawater and oil are filled in the grooves inside the glass structures, which are the resonators of an absorber. The proposed absorber can be regulated by the gravity field, which is a brand new one compared with the previous designs. When the operating state of such a TGTMA is adjusted from one to another, a marvelous alteration of absorption can be achieved. For TM wave, the absorption band runs from 5.6 to 7.91 GHz which is over 90%, while the absorption keeps larger than 90% from 4.32 to 5.83 GHz when this absorber is rotated 180° in xy plane. The larger incident angle is the better performance of this TGTMA can be achieved. Further, the simulation results of the structure parameters are discussed. The surface current distributions, the power flows, and the power loss densities are also given to expound the physical mechanism of the proposed absorber. Importantly, compared with most of current tailoring approaches of the absorbers, the proposed method is more convenient.