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传统的吸波材料无法使天线同时满足工作带外隐身和工作带内透波的特殊要求。文中结合传统吸波材料的吸波特性和频率选择表面的滤波特性,提出了一种超材料的宽带吸波的隐身天线罩。利用超材料的谐振叠加特性,设计出宽带人工吸波结构。采用阻抗匹配技术进一步提高天线在工作频带内的透过率,并提高天线带外的吸收率。通过调节超材料吸波体的尺寸,构造了一种Ku频带透波、高于Ku频段吸波的超材料天线罩,在保证天线带内正常通信前提下,可减小天线带外的雷达散射截面,提高机载天线的隐身性能。
The traditional microwave absorbing material can not make the antenna meet the special requirements of working out of band and transparent wave in the working band at the same time. In this paper, we propose a stealth radome with a broadband absorption of metamaterials, combining with the absorbing characteristics of the traditional absorbing materials and the filtering characteristics of the frequency selective surfaces. Using the superposition of the resonant properties of metamaterials, a broadband artificial wave absorbing structure is designed. The use of impedance matching technology to further improve the antenna in the operating frequency band transmittance, and improve the absorption rate of the antenna out of band. By adjusting the size of the metamaterial absorber, a metamaterial radome with a Ku band passband and a Ku band absorbance was constructed, which can reduce the out-of-band radar scatter while ensuring the normal communication within the antenna band Section, to improve the stealth performance of the airborne antenna.