Controllable metamaterial absorbers

Metamaterial allows tailoring its electromagnetic (EM) properties through careful design of the resonant inclusions, providing much advantage over normal material. In this presentation, we employ active elements into the metamaterial designs and demonstrate several EM wave absorbers based on the metamaterial concept that have controllable EM responses including tunable absorption band, switchable due-band absorption, and switchable operation between absorption and reflection. Both the design procedures and the EM performances will be presented and discussed. We believe these examples would bring significant ability of metamaterial for controlling EM wave propagation.