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本文提出了一种具有宽带吸波和通带频率可调特性的吸波透波罩结构。这种吸波透波罩结构的周期单元尺寸等于10mm,仅为λ/30,结构的厚度仅为5.14mm。结构所采用的小型化周期单元能够提高入射角稳定性并延迟栅瓣出现的最低频率。由于周期单元的旋转对称性,入射波的极化对结构的透波和吸波特性影响很小。同时,这种结构的通带频率能够在0.5GHz到1.14GHz的范围内调整,可用作跳频通信。仿真结果显示这种吸波透波罩结构在6.8GHz到24GHz的频带内都有良好的吸波特性。
In this paper, we propose a microwave absorbing transparent waveguiding structure with broadband absorbing and passband frequency tunable characteristics. The structure of this wave-absorbing transparent cover cycle unit size is equal to 10mm, only λ / 30, the thickness of the structure is only 5.14mm. The miniaturized periodic elements used in the structure increase the stability of the incident angle and delay the lowest frequency at which the grating lobes appear. Due to the rotational symmetry of the periodic elements, the polarization of the incident wave has little effect on the transmission and absorption characteristics of the structure. At the same time, the passband frequency of this structure can be adjusted from 0.5 GHz to 1.14 GHz and can be used as frequency hopping communication. The simulation results show that the structure of this wave absorption transparent cover has a good absorbing characteristic in the frequency band of 6.8GHz to 24GHz.