volume | PIER Journals

Abstract

A novel broadband absorber using the fractal tree structure is presented in this paper, which consists of three metallic layers separated by two dielectric substrates. Five metallic vias connect these three layers which make the whole structure like a two order fractal tree. Simulated and measured results show that this absorber can provide a high absorptivity level from 4.98 to 12.58 GHz, equivalent to a relative absorption bandwidth about 87%. Further investigations show that this wideband absorption can be attributed to the multi-eigenmodes and lower quality factor of the fractal tree structure.

1. Fante, R. L. and M. T. McCormack, "Reflection properties of the Salisbury screen," IEEE Trans. Antennas Propagat., Vol. 36, 1443-1454, Oct. 1988.
doi:10.1109/8.8632

2. Chambers, B., "Optimal design of a Salisbury screen radar absorber," Electronics Letters, Vol. 30, No. 16, 1353-1354, Aug. 1994.
doi:10.1049/el:19940896

3. Gao, Q., Y. Yin, D.-B. Yan, and N.-C. Yuan, "A novel radar-absorbing material based on EBG structure," Microw. Opt. Technol. Lett., Vol. 47, No. 3, 228-230, 2005.
doi:10.1002/mop.21132

4. Yang, J. and Z. X. Shen, "A thin and broadband absorber using double-square loops," IEEE Antennas Wireless Propag. Lett., Vol. 6, 388-391, 2007.
doi:10.1109/LAWP.2007.903496

5. Cheng, Y. Z., Y. Wang, et al. "Design, fabrication and measurement of a broadband polarization insensitive metamaterial absorber based on lumped elements," J. Appl. Phys., Vol. 111, 044902, 2012.
doi:10.1063/1.3684553

6. Lee, J. and S. Lim, "Bandwidth-enhanced and polarization-insensitive metamaterial absorber using double resonance," Electronics Lett., Vol. 47, No. 1, 8-9, 2011.
doi:10.1049/el.2010.2770

7. Ghosh, S., S. Bhattacharyya, Y. Kaiprath, and K. V. Srivastava, "Bandwidth-enhanced polarization insensitive microwave metamaterial absorber and its equivalent circuit model," J. Appl. Phys., Vol. 115, 104503, 2014.
doi:10.1063/1.4868577

8. Puente, C. and J. Claret, "Multiband properties of a fractal tree antenna generated by electrochemical deposition," Electronics Lett., Vol. 32, No. 25, 2298-2299, 1996.
doi:10.1049/el:19961579

9. Werner, D. H., A. R. Bretones, and B. R. Long, "Radiation characteristics of thin-wire ternary fractal trees," Electronics Lett., Vol. 35, No. 8, 609-610, 1999.
doi:10.1049/el:19990478

10. Petko, J. S. and D. H. Werner, "Miniature reconfigurable three dimensional fractal tree antennas," IEEE Trans. Antennas Propagat., Vol. 52, No. 8, 1945-1956, 2004.
doi:10.1109/TAP.2004.832491

11. Filippo, C., M. Agostino, and M. Giuliano, "Analysis and design of ultran thin electromagnetic absorbers comprising resistively loaded high impedance surfaces," IEEE Trans. Antennas Propagat., Vol. 58, No. 5, 1551-1558, 2010.
doi:10.1109/TAP.2010.2044329

12. Ziolkowski, R.W., "Design, fabrication and testing of double negative metamaterials," IEEE Trans. Antennas Propagat., Vol. 51, No. 7, 1516-1529, 2003.
doi:10.1109/TAP.2003.813622

13. Smith, D. R., D. C. Vier, T. Koschny, and C. M. Soukoulis, "Electromagnetic parameter retrieval from inhomogeneous metamaterials," Phys. Rev. E, Vol. 71, 036617, 2005.
doi:10.1103/PhysRevE.71.036617

Dr. Jia-Jun Ma

Dr. Wei Hong Tong

Dr. Kai Shi

Prof. Xiang-Yu Cao

Dr. Bing Gong