Water-Based Dual-Band Metamaterial Absorber

This paper presents a study on a dual-band metamaterial absorber containing water in the structure. Two designs are considered as each absorber contains metal resonators printed on a substrate, a layer of pure water, a metal ground plane, and a layer of plastic isolating the water from the substrate and the metal plate. The two absorbers differ in the configuration of the used water container. One of the designs demonstrates one absorption peak at high frequency while the other design two peaks when the metal resonators are removed from the structure. The simulated results reveal that the designs have a narrow low and a wide high frequency absorption band. The absorption performance for different temperatures of the water is studied. The temperature change is taken through a change in the dielectric properties of the water. Some reconfiguration of the absorption performance can be achieved by changing the water temperature.