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为了缩减天线带内雷达散射截面(radar cross section, RCS), 在双频带完美吸波材料的基础上, 通过缩小两吸波率峰值之间的距离, 设计出了一种频带较宽的超薄完美吸波体.该吸波体由两层金属及其中间的有耗介质组成, 底面金属不刻蚀, 顶面由方形贴片和绕其四周的开口方环组成, 该结构具有低频点LC谐振和高频点偶极子谐振的特征.仿真和实验结果表明: 该吸波体具有极化不敏感和宽入射角的特征, 其在厚度小于0.01λ的条件下, 具有8.2%的半波功率相对带宽, 最大吸波率的峰值为91.6%和96.5%. 将吸波体用于圆极化的倾斜波束 (tilted beam, TB)天线, 仿真和测试结果表明: 该天线在保持增益不变的条件下, 不仅轴比得到改善, 有效带宽得到拓展, 且在5.5–6.5 GHz范围内TB天线的RCS缩减至少在3 dBsm以上, 在谐振频点处最大缩减幅度分别为11 dBsm和8 dBsm; 在两谐振点处鼻锥方向-36°–+36°范围内, TB天线的RCS缩减均有明显效果.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
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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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