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%.
2. Fu, W., et al., "Polarization insensitive wide-angle triple-band metamaterial bandpass filter," J. Phys. D. Appl. Phys., Vol. 49, No. 28, 285110, Jul. 2016.
3. Lin, F. H. and Z. N. Chen, "Low-profile wideband metasurface antennas using characteristic mode analysis," IEEE Trans. Antennas Propag., Vol. 65, No. 4, 1706-1713, Apr. 2017.
4. Zhang, L., et al., "Ultrabroadband design for linear polarization conversion and asymmetric transmission crossing X- and K-band," Sci. Rep., Vol. 6, No. 1, 33826, Dec. 2016.
5. Landy, N. I., S. Sajuyigbe, J. J. Mock, D. R. Smith, and W. J. Padilla, "Perfect metamaterial absorber," Phys. Rev. Lett., Vol. 100, No. 20, 207402, May 2008.
6. Thummaluru, S. R., N. Mishra, and R. K. Chaudhary, "Design and analysis of an ultrathin Xband polarization-insensitive metamaterial absorber," Microw. Opt. Technol. Lett., Vol. 58, No. 10, 2481-2485, Oct. 2016.
7. Trung, N. T., D. Lee, H. Sung, and S. Lim, "Angle- and polarization-insensitive metamaterial absorber based on vertical and horizontal symmetric slotted sectors," Appl. Opt., Vol. 55, No. 29, 8301, Oct. 2016.
8. Cheng, Y. and H. Yang, "Design, simulation, and measurement of metamaterial absorber," J. Appl. Phys., Vol. 108, No. 3, 34906, Aug. 2010.
9. Bhattacharyya, S. and K. V. Srivastava, "An ultra thin electric field driven LC resonator structure as metamaterial absorber for dual band applications," International Symposium on Electromagnetic Theory, Vol. C, 722-725, 2013.
10. Dincer, F., M. Karaaslan, E. Unal, O. Akgol, and C. Sabah, "Multi-band metamaterial absorber: Design, experiment and physical interpretation," ACES J., Vol. 29, No. 3, 197-202, 2014.
11. Dincer, F., M. Karaaslan, E. Unal, and C. Sabah, "Dual-band polarization independent metamaterial absorber based on omega resoanator and octa-star strip configuration," Progress In Electromagnetics Research, Vol. 141, 219-231, Jul. 2013.
12. Dincer, F., et al., "Multi-band polarization independent cylindrical metamaterial absorber and sensor application," Mod. Phys. Lett. B, Vol. 30, No. 8, 1650095, Mar. 2016.
13. Tak, J., Y. Jin, and J. Choi, "A dual-band metamaterial microwave absorber," Microw. Opt. Technol. Lett., Vol. 58, No. 9, 2052-2057, Sep. 2016.
14. Chen, J., Z. Hu, S. Wang, X. Huang, and M. Liu, "A triple-band, polarization- and incident angleindependent microwave metamaterial absorber with interference theory," Eur. Phys. J. B, Vol. 89, No. 1, 14, Jan. 2016.
15. Liu, S., et al., "A bi-layered quad-band metamaterial absorber at terahertz frequencies," J. Appl. Phys., Vol. 118, No. 24, 245304, Dec. 2015.
16. Liu, Y., S. Gu, C. Luo, and X. Zhao, "Ultra-thin broadband metamaterial absorber," Appl. Phys. A, Vol. 108, No. 1, 19-24, Jul. 2012.
17. Xiong, H., J.-S. Hong, C.-M. Luo, and L.-L. Zhong, "An ultrathin and broadband metamaterial absorber using multi-layer structures," J. Appl. Phys., Vol. 114, No. 6, 64109, Aug. 2013.
18. Gunduz, O. T. and C. Sabah, "Polarization angle independent perfect multiband metamaterial absorber and energy harvesting application," J. Comput. Electron., Vol. 15, No. 1, 228-238, Mar. 2016.
19. Ghosh, S., S. Bhattacharyya, Y. Kaiprath, D. Chaurasiya, and K. V. Srivastava, "Triple-band polarization-independent metamaterial absorber using destructive interference," 2015 European Microwave Conference (EuMC), 335-338, 2015.
20. Bhattacharyya, S. and K. Vaibhav Srivastava, "Triple band polarization-independent ultra-thin metamaterial absorber using electric field-driven LC resonator," J. Appl. Phys., Vol. 115, No. 6, 64508, Feb. 2014.
21. Chaurasiya, D., S. Ghosh, S. Bhattacharyya, and K. V. Srivastava, "An ultrathin quad-band polarization-insensitive wide-angle metamaterial absorber," Microw. Opt. Technol. Lett., Vol. 57, No. 3, 697-702, Mar. 2015.
22. Wang, B.-X., G.-Z. Wang, and L.-L. Wang, "Design of a novel dual-band terahertz metamaterial absorber," Plasmonics, Vol. 11, No. 2, 523-530, Apr. 2016.
23. Smith, D. R., S. Schultz, P. Markos, and C. M. Soukoulis, "Determination of effective permittivity and permeability of metamaterials from reflection and transmission coefficients," Phys. Rev. B, Vol. 65, No. 19, 195104, Apr. 2002.
24. Bhattacharyya, S., S. Ghosh, and K. Vaibhav Srivastava, "Triple band polarization-independent metamaterial absorber with bandwidth enhancement at X-band," J. Appl. Phys., Vol. 114, No. 9, 94514, Sep. 2013.
25. Bian, B., et al., "Novel triple-band polarization-insensitive wide-angle ultra-thin microwave metamaterial absorber," J. Appl. Phys., Vol. 114, No. 19, 194511, Nov. 2013.
26. Bhattacharyya, S., S. Ghosh, and K. V. Srivastava, "Equivalent circuit model of an ultra-thin polarization-independent triple band metamaterial absorber," AIP Adv., Vol. 4, No. 9, 97127, Sep. 2014.
27. Baskey, H. B., M. J. Akhtar, A. K. Dixit, and T. C. Shami, "Design, synthesis, characterization and performance evaluation of multi-band perfect metamaterial absorber," Journal of Electromagnetic Waves and Applications, Vol. 29, No. 18, 2479-2491, Dec. 2015.
28. Pang, Y., H. Cheng, Y. Zhou, and J. Wang, "Analysis and design of wire-based metamaterial absorbers using equivalent circuit approach," J. Appl. Phys., Vol. 113, No. 11, 2013.
29. Zhou, J., E. N. Economon, T. Koschny, and C. M. Soukoulis, "Unifying approach to left-handed material design," Opt. Lett., Vol. 31, No. 24, 3620, Dec. 2006.
30. Hong, J., Microstrip Filters for RF/Microwave Applications, 2nd Ed., John Wiley & Sons, Inc., 2011.
31. Xu, H.-X., G.-M. Wang, M.-Q. Qi, J.-G. Liang, J.-Q. Gong, and Z.-M. Xu, "Triple-band polarization-insensitive wide-angle ultra-miniature metamaterial transmission line absorber," Phys. Rev. B, Vol. 86, No. 20, 205104, Nov. 2012.
32. Wang, B.-Y., et al., "A novel ultrathin and broadband microwave metamaterial absorber," J. Appl. Phys., Vol. 116, No. 9, 94504, Sep. 2014.