Controllable wave-absorbing metamaterial

A controllable wave-absorbing metamaterial, comprising:

• a substrate;
• and
• a metamaterial unit array layer disposed on the substrate and comprising a plurality of conductive geometric units that are periodically arranged, each of the conductive geometric units comprising a first hollow structure, second hollow structures, and conductive geometric structures;
• wherein the second hollow structures are respectively extended from four vertices of the first hollow structure, and the conductive geometric structure is disposed between each two adjacent second hollow structures;
• and each of the second hollow structures comprises a first end facing toward the center of the conductive geometric unit and a second end facing away from the center of the conductive geometric unit;
• wherein the first end of the second hollow structure is provided with a varactor diode connected to the conductive geometric structures at both sides, the second end of the second hollow structure is provided with a fixed capacitor and a fixed resistor that are spaced apart from each other;
• the fixed capacitor is connected to the conductive geometric structure at one side, and the fixed resistor is connected to the conductive geometric structure at the other side.