大角度的多波段可调谐超材料吸波器

A large angle tunable triple-band metamaterial absorber

提出了一种可用于微波段的可调超材料吸波器设计.该超材料吸波器由两个长度成一定比例的闭口金属环和一个十字形谐振器组成,在5~12 GHz频率范围内具有三个独立可调的工作频段(C和X波段),分别为6.36 GHz、7.96 GHz、10.12 GHz,吸收率分别为0.937、0.999和0.993.在大角度入射时,该吸波器可保持较高的吸收效率.此外研究了设计结构的可调谐性,当顶层的二氧化钒(VO2)处于全金属状态时,微波段有三个吸收峰,吸收率最高值分别为0.939、0.827、0.92.由于VO2的电导率从30000 S/m到200000 S/m变化,吸收率在三个吸收峰上实现了动态可调.该研究结果在多波段传感检测中有潜在的应用前景.

A tunable metamaterial absorber that can be used in the microwave band is presented in this paper,which consists of two metal rings of proportional length and a cross-shaped resonator(CSR).With three independently adjustable operating bands(C and X-band)in the frequency range of 5-12 GHz,the peaks are located at 6.36 GHz,7.96 GHz and 12.12 GHz,with absorption rates of 0.937,0.999 and 0.993,respectively.The absorber can maintain high absorption when incidents at a large angle.In addition,the tunability of the design structure is studied.When the top layer of vanadium dioxide(VO2)is in the all-metal state,there are three absorption peaks in the microwave segment,and the maximum absorption rates are 0.939,0.827 and 0.92,respectively.Since the conductivity of VO2 varies from 30,000 S/m to 200,000 S/m,the absorption is dynamically adjustable at three absorption peaks.The results of the structure have a potential application prospect in multi-band sensor detection.