基于頻率選擇表面單元結構的超材料吸波體的設計
[Abstract]:In this paper, the absorbing structures of single-band and dual-band structure elements based on frequency-selective surface are analyzed and summarized, and a single-layer broadband supermaterial absorbing structure is designed. The 3D electromagnetic simulation software CST is used to model and simulate it. The results show that compared with the metamaterial absorbing structure based on classical FSS structure, the -5dB bandwidth can be extended to more than 100% and the thickness of the dielectric layer is much less than 1/4 of the operating wavelength. At the same time, the results are verified according to the equivalent circuit theory. The main contents of this paper are as follows: (1) the basic concepts and theories of classical Salisbury screen, Jaumann screen, frequency selective surface, metamaterial absorber are expounded. And some of their basic characteristics. (2) the basic element structure based on the frequency selective surface supermaterial absorber is designed, and the size of the structure, the dielectric layer, the polarization mode of the incident wave, the incident angle of the incident wave are discussed. The influence of material of circuit screen on absorption efficiency. (3) double frequency point supermaterial absorbing structure based on frequency selective surface composite structure is designed. The two corresponding main resonance points of the combined structure are 1.5THz and 3THZ respectively. At the same time, the influence of the size and spacing of the structure on the absorption coefficient is discussed. The results show that the combined structure has high absorption efficiency, good angle and polarization stability. (4) the single-layer broadband absorbing structure based on FSS terahertz band is proposed. Compared with the traditional structure, the bandwidth of -5 dB can be increased by more than 100%, and the thickness of the structure can be reduced by half. Based on the rectangular patch, the E-shaped structure is obtained by slotted processing. Compared with rectangular patch, the absorption bandwidth is significantly improved.
【學位授予單位】:南京郵電大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TB39
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