CAJ | 학술논문

　　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。
　　기우십자분형결구，설계료일충소형화、초박、고흡파솔이급무표면손모층적초재료흡파체。해흡파체시유량층금속급기중간적유모개질조성，상층금속시유주기성식각십자분형적첩편조성적전해진기，하층금속불식각，작위정개금속지판。통과우화결구삼수，흡파체단원척촌부위0.13λ，후도위0.0093λ，최대흡파솔체99.6％。장차흡파체가재우보통미대천선상，제비료일충신형초재료천선。방진화실험결과표명：상비보통미대천선，신천선재5.52～5．68 GHz공작빈대내，법향RCS감축도재3 dB이상，최대감축량체13．5 dB，단참RCS재-18°～＋18°각역감축초과3 dB，차천선복사성능보지불변，증실료해흡파체구유량호적흡파효과，가이응용우미대천선적대내은신。
A metamaterial absorber with miniaturization,ultra thinness,high absorptivity rate and no surface ul-lage layer is designed based on cross fractal structure. The absorber is composed of 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 thickness is about 0.0093λand the absorption can exhibt 99.6%. When it is loaded on a coventional mi-crostrip antenna,a novel metamaterial antenna is obtained. The simulation and measured results demonstate that compared with conventional antenna,the radar 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 ab-sorptivity and can be applied to microstrip antennas to achieve in-band stealth.