基于电谐振单元的超介质吸波材料及矩形波导匹配终端应用研究

Research of metamaterial absorbers and their rectangular waveguide matching terminal applications based on the electric resonators

针对在自由空间中测试超介质吸波材料的高复杂性及高成本特点,实验研究了4种由电谐振单元构成的超介质吸波材料在X波段(8—12GHz)矩形波导里的吸波性能.实验结果表明,此4种吸波材料在终端短路的矩形波导里显示出与其在自由空间中相似的吸波性能及吸波机理.据此,进一步研究了基于超介质吸波材料的矩形波导匹配终端应用.分析结果显示,此种新型匹配终端具有结构紧凑、工作频段可简单控制、成本低等优点.通过展宽超介质吸波材料的吸波频段可设计出宽频带的矩形波导匹配终端.

To cope with the high complex properties and high costs of measuring the metamaterial absorber in the free space, in this paper we experimentally discuss the absorption characteristics of four kinds of metamaterial absorbers based on different electric resonators in a closed X-band （8-12 GHz） rectangular waveguide. The measured results indicate that the four metamaterial absorbers exhibite similar absorption characteristics and mechanisms in comparison with the results obtained from free space. Further, in this paper we also discuss the rectangular wave matching terminal applications based on the proposed four metamaterial absorbers. And the results show that these new rectangular waveguide matching terminals can possess the advantages including the compact dimensional size, flexible controllability of the operating frequencies, and low costs. Moreover, the matching frequency bands of the novel terminals can be realized by designing the broadband metamaterial absorbers.