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本文设计了一种基于磁/电介质混合型基体的宽带超材料吸波体,吸波体基本单元由电阻膜、磁/电介质混合型基体以及金属背板组成.采用时域有限差分法对超材料吸波体吸波性能进行了仿真,使用遗传算法优化了反射率小于-10 d B的带宽.仿真结果表明,当超材料吸波体厚度为2.5 mm时,在7.8—18 GHz频率范围内的反射率小于-10 d B,具有厚度薄、宽带、极化不敏感等优点.通过等效电路模型对其工作机理进行了分析与讨论.最后制备样品进行测试,测试结果与仿真结果一致.
In this paper, a wideband metamaterial absorber based on a magnetic / dielectric hybrid substrate is designed. The basic unit of the absorber consists of a resistive film, a hybrid substrate of magnetic / dielectric and a metal backplane. The finite element method The wave-absorbing properties of the absorber are simulated and the genetic algorithm is used to optimize the bandwidth with the reflectance less than -10 d B. The simulation results show that when the thickness of the absorber is 2.5 mm, Its reflectivity is less than -10 d B, which has the advantages of thin thickness, wide band and insensitivity to polarization etc. Its working mechanism is analyzed and discussed through the equivalent circuit model.Finally, the samples are prepared for testing and the test results are in accordance with the simulation results.