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仿真和实验验证了厚度极薄的平面结构超材料吸波体,该吸波体采用加载交指电容的耶路撒冷十字结构,通过增加单元间的耦合电容显著降低了其工作频率.测试结果表明,该超材料吸波体在1.58 GHz,吸收率峰值为88.48%,其厚度为2 mm,约为1/95工作波长,吸波体的单元尺寸为11 mm,约为1/17工作波长.此外,通过金属通孔将耶路撒冷十字结构与金属底板相连接,使其对斜入射横电和横磁极化电磁波具有宽角度吸收特性,在60时依然具有较高的吸收率,且吸收峰频率几乎不发生偏移,从而使其更具实用价值.
Simulation and experimental verification of the extremely thin planar metamaterial absorber, using a cross-capped Jerusalem cross structure, significantly reduces the operating frequency by increasing the coupling capacitance between the cells. The test results show that the At 1.58 GHz, the absorbance peak of the metamaterials is 88.48% with a thickness of 2 mm and a working wavelength of about 1/95. The unit size of the absorber is 11 mm, which is about 1/17 of the working wavelength. In addition, The Jerusalem cross structure is connected to the metal base via metal through holes so that it has a wide angle absorption characteristic for oblique incident transverse and transverse magnetic polarization electromagnetic waves and still has a high absorption at 60 and hardly any absorption peak frequency Offset, so that it is more practical value.