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Salisbury屏是一种基本的吸波结构,在谐振频率点具有良好的吸波性能,但是它的厚度必须为四分之一倍的波长,这不利于工程的应用。本文在Salisbury屏的阻抗层设计中引入了有耗的频率选择表面贴片,有效减小了Salisbury屏的厚度,形成一个电磁带隙吸波结构。应用微遗传算法对频率选择表面贴片的几何图形及表面阻抗、结构的周期大小、介质的厚度等参数进行最优化处理。设计得到的两个在谐振频率点处具有良好吸波性能的超薄电磁带隙吸波结构验证了本文方法的正确性与可靠性。
Salisbury screen is a basic wave absorbing structure with good absorbing properties at the resonant frequency, but its thickness must be a quarter of the wavelength, which is not conducive to engineering applications. In this paper, the design of the impedance layer of the Salisbury screen introduces a loss-prone frequency selective surface mount, which effectively reduces the thickness of the Salisbury screen to form an electromagnetic band-gap absorbing structure. The micro-genetic algorithm is used to optimize the geometry and surface impedance of the frequency selective surface mount, the periodicity of the structure, the thickness of the medium and other parameters. The design of two ultra-thin electromagnetic band-gap absorbers with good microwave absorption at the resonance frequency point verifies the correctness and reliability of the proposed method.