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基于电阻膜设计了一种宽频带、极化不敏感和宽入射角的超材料吸波体.该吸波体的结构单元由六边形环状电阻膜结构、介质基板和金属背板组成.仿真得到的反射率和吸收率表明,该吸波体在7.0—27.5GHz之间对入射电磁波具有宽频带的强吸收,证实了电路谐振相对于电磁谐振易于实现宽带吸波.仿真得到的不同极化角和不同入射角下超材料吸波体的吸收率表明,该吸波体具有极化不敏感和宽入射角特性.仿真得到的基板和电阻膜对超材料吸波体吸收率的影响表明,电阻膜结构和金属背板之间形成的电容以及电阻膜结构的电阻都存在一个最佳值,此时电路谐振最强、吸收带宽最大.
A wideband, polarization-insensitive and wide angle of incidence metamaterial absorber is designed based on the resistive film.The structural unit of the absorber is composed of a hexagonal ring resistive film structure, a dielectric substrate and a metal backplane. The reflectivity and absorption rate obtained by the simulation show that the absorbing body has a strong absorption in broad frequency band of incident electromagnetic wave between 7.0-27.5GHz, which proves that the circuit resonance is easy to realize broadband absorbing with respect to electromagnetic resonance. The absorption rate of metamaterial wave absorbers at different angles of incidence and at different angles of incidence shows that the wave absorbers have polarization insensitivity and wide angle of incidence characteristics.The influence of simulated substrates and resistive films on the absorbance of metamaterial absorbers shows that , There is an optimal value for the capacitance formed between the resistive film structure and the metal back plate and the resistance of the resistive film structure. In this case, the circuit has the strongest resonance and the maximum absorption bandwidth.