A novel six-band metamaterial absorber based on four multiple-mode Ω-shaped resonators (MMORs) is presented, analyzed and measured in this paper. The discrete absorption responses, determined by horizontal-oriented and vertical-oriented MMORs, can be combined to add the total number of absorption peaks. Among the six absorption peaks, four absorption peaks are excited by horizontal-oriented MMOR, and the other two are excited by vertical-oriented MMOR. The absorber, composed of a simple resonators-dielectric-sheet sandwich structure, has six distinct near-perfect absorption peaks with the polarization-insensitive characteristic in the range from 2 to 17 GHz. To reveal the physical mechanism, the distributions of surface current and power loss density, and the equivalent circuit model are also investigated at the six absorption peaks. Moreover, the measured results are in good agreement with the simulated ones and show that the average absorption rate of proposed absorber is over 97.21%.
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