Single-/dual-/triple band metamaterial absorbers based on cut wire and square ring are discussed at microwave frequencies. The single-/dual-/triple band characteristics are realized by loading the cut wires in the square ring. The results indicate that the proposed metamaterial absorbers exhibit near-perfect impedance matching with free space and high absorbance of 99.50% at 4.70 GHz for single-band condition, and absorbance of 98.75% and 97.64% at 4.44 and 8.55 GHz, respectively, for dual-band condition. The triple band MMA can achieve the absorbance of 96.94%, 97.91% and 94.83% at 4.48 GHz, 7.81 GHz and 14.05 GHz, respectively. It also exhibits a wide range of angles of incidence for both TE and TM radiation. The physical mechanism of the absorptions is interpreted by the simulated surface current distributions and power-loss of the structures. Microwave experiments are performed to successfully realize these ideas, and measured results are in good agreement with the numerical results.
展开▼
