| 摘要: |
| 基于十字分形结构，设计了一种小型化、超薄、高吸波率以及无表面损耗层的超材
料吸波体。该吸波体是由两层金属及其中间的有耗介质组成，上层金属是由周期性蚀刻十字
分形的贴片组成的电谐振器，下层金属不蚀刻，作为整个金属地板。通过优化结构参数，吸
波体单元尺寸仅为0.13λ，厚度为0.0093λ，最大吸波率达99.6%。将此
吸波体加载于普通微带天线上，制备了一种新型超材料天线。仿真和实验结果表明：相比普通微带天线，新
天线在5.52～5.68 GHz工作频带内，法向RCS减缩都在3 dB以上，最大减缩量达
13.5 dB，单站RCS在-18°～+18°角域减缩超过3 dB，且天线辐射性能保持不变，证
实了该吸波体具有良好的吸波效果，可以应用于微带天线的带内隐身。 |
| 关键词: 微带天线 吸波体 超材料 十字分形 带内隐身 |
| DOI：10.3969/j.issn.1001-893x.2013.07.022 |
|
| 基金项目:国家自然科学基金资助项目（61271100）；陕西省自然科学基础研究重点项目（2010JZ010）；陕西省自然科学基础研究项目（2012JM8003） |
|
| Design of a microstrip antenna based on fractal metamaterial absorber |
| SHANG Kai,CAO Xiang-yu,YANG Huan-huan,LIU Tao,YUAN Zi-dong,ZHAO Yi |
| () |
| Abstract: |
| A metamaterial absorber with miniaturization, ultra thinness, high absorptivity rate and no surface ullag
e layer is designed based on cross fractal structure. The absorber is composed o
f two metallic layers separated by a lossy dielectric spacer. The top layer consists of etched cross fractal patch set in a periodic pattern and the bottom one is a solid metal. By optimizing the geometric
parameters of the structure,its unit size is only 0.13λ, the thicknes
s is about 0.0093λ and the absorption can exhibt 99.6%. When it is loaded on a
coventional microstrip antenna, a novel metamaterial antenna is obtained. The simulation
and measured results demonstate that compared with conventional antenna, the ra
dar cross section (RCS) of the novel antenna in boresight direction is reduced by 3 dB, and the most reduction vaule exceeds 13.5 dB,the monstatic RCS reduction is over 3 dB from -18° to +18°, while the radiation performance
is kept, which proves that the absorber has an excellent absorptivity and can
be applied to microstrip antennas to achieve in-band stealth. |
| Key words: microstrip antenna absorber metamaterial cross fractal in-band stealth |
《电讯技术》编辑部 