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In order to reduce the radar cross section (RCS) of antenna, a wideband-enhanced ultra-thin metamaterial absorber is designed by reducing the distance between the two absorption peaks due to the double resonances. The absorber is composed of two metallic layers separated by a lossy dielectric spacer. The top layer consists of a single-square loop with four splits on the four sides and a square metal patch in the center and the bottom one is of a solid metal. A dipole resonance and an LC resonance are caused by the structure of the metamaterial absorber. By fine adjusting geometry parameters of the structure, we can obtain a polarization-insensitive and wide-incident-angle ultra-thin absorber whose absorption values are 91.6% and 96.5%. On condition that thickness is less than 0.01λ the absorber has a full-width at half-maximum of 8.2%. The absorber is applied to the circularly polarized tilted beam antenna for reducing RCS. Simulated and experimented results show that the RCS reduction of antenna is above 3 dB within the operation band from 5.5 GHz to 6.5 GHz, the gain is not changed and the bandwidth is increased due to the improvement of axial ratio. At the resonance, the most reduction values exceed 8 dBsm and 11 dBsm while the absorber has a good characteristic of RCS reduction at the boresight direction from -36° to +36°.
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Keywords:
- ultra-thin metamaterial absorber /
- tilted beam antenna /
- radar cross section /
- circular polarization
[1] Li W Q, Cao X Y, Gao J, Yao X 2011 J. Microw. 27 9 (in Chinese) [李文强, 曹祥玉, 高军, 姚旭2011 微波学报 27 9]
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[16] Bao S, Luo C R, Zhao X P 2011 Acta Phys. Sin. 60 014101 (in Chinese) [保石, 罗春荣, 赵晓鹏 2011 60 014101]
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[18] Szabo Z, Park G H, Hedge R, Li E P 2010 IEEE Trans. Microw. Theory Tech. 58 2646
[19] Chen X, Grzegorczyk T M, Wu B I, Pcheco J, Kong J A 2004 Phys. Rev. E 70 016608
[20] Nakano H, Kirita S, Naoki M, Yamauchi J J 2011 IEEE Trans. Antennas Propag. 59 3969
[21] Hirose K, Okazaki S, Nakano H 2002 Trans. IEICE J. 85 1934
[22] Li S J, Cao X Y, Gao J, Zheng Q R, Yang H H 2013 J. Xidian Univ. (Nat Sci. Edition) 40 1432 (in Chinese) [李思佳, 曹祥玉, 高军, 郑秋容, 杨欢欢 2013 西安电子科技大学学报 (自然科学版) 40 1432]
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[1] Li W Q, Cao X Y, Gao J, Yao X 2011 J. Microw. 27 9 (in Chinese) [李文强, 曹祥玉, 高军, 姚旭2011 微波学报 27 9]
[2] Juan Y, Shen Z X 2007 IEEE Antenna Wireless Propag. Lett. 6 288
[3] Ling J, Gong S X, Zhang P F, Yuan H W, Lu B, Wang W T 2011 J. Xidian Univ. (Nat Sci. Edition) 37 295 (in Chinese) [凌劲, 龚书喜, 张鹏飞, 袁宏伟, 路宝, 王文涛2011西安电子科技大学学报(自然科学版) 37 295]
[4] Jiang W, Liu Y, Gong S X 2009 IEEE Antenna Wireless Propag. Lett. 8 1275
[5] Costa F, Monorchio A, Genovesi S 2010 IEEE Trans. Antennas Propag. 58 1551
[6] Paquay M, Iriarte J C, Ederra I, Gonzalo R, Maagt D 2007 IEEE Trans. Antennas Propag. 55 3630
[7] Zhang Y, Mittra R, Wang B Z, Huan N T 2009 Electron. Lett. 45 484
[8] Landy N I, Sajuyigbe S, Mock J J 2008 Phys. Rev. Lett. 100 207402
[9] Liu T, Cao X Y, Gao J, Zheng Q R, Li W Q 2012 Acta Phys. Sin. 61 184101 (in Chinese) [刘涛, 曹祥玉, 高军, 郑秋容, 李文强2012 61 184101]
[10] Yang H H, Cao X Y, Gao J, Liu T, Li W Q 2012 J. Electron. Inform. Tech. 34 2790 (in Chinese) [杨欢欢, 曹祥玉, 高军, 刘涛, 李文强 2012电子与信息学报 34 2790]
[11] Ashish Dubey T C 2012 J. Sci. Defer. 62 261
[12] Chen H T 2012 Opt. Express 62 7165
[13] Zhu W R, Huang Y J, Rukhlenko I D, Wen G J, Premaratne M 2012 Opt. Express 62 6616
[14] Li L, Yang Y, Liang C H 2011 J. Appl. Phys. 110 06370
[15] Gu C, Qu S B, Pei Z B, Xu Z, Bai P, Peng W D, Lin B Q 2011 Acta Phys. Sin. 60 087801 (in Chinese) [顾超, 屈绍波, 裴志斌, 徐卓, 柏鹏, 彭卫东, 林宝勤 2011 60 087801]
[16] Bao S, Luo C R, Zhao X P 2011 Acta Phys. Sin. 60 014101 (in Chinese) [保石, 罗春荣, 赵晓鹏 2011 60 014101]
[17] Smith D R, Vier D C, Koschny Th, Soukoulis C M 2005 Phys. Rev. E 71 036617
[18] Szabo Z, Park G H, Hedge R, Li E P 2010 IEEE Trans. Microw. Theory Tech. 58 2646
[19] Chen X, Grzegorczyk T M, Wu B I, Pcheco J, Kong J A 2004 Phys. Rev. E 70 016608
[20] Nakano H, Kirita S, Naoki M, Yamauchi J J 2011 IEEE Trans. Antennas Propag. 59 3969
[21] Hirose K, Okazaki S, Nakano H 2002 Trans. IEICE J. 85 1934
[22] Li S J, Cao X Y, Gao J, Zheng Q R, Yang H H 2013 J. Xidian Univ. (Nat Sci. Edition) 40 1432 (in Chinese) [李思佳, 曹祥玉, 高军, 郑秋容, 杨欢欢 2013 西安电子科技大学学报 (自然科学版) 40 1432]
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