人工电磁软硬表面结构设计及其应用研究
[Abstract]:The artificial electromagnetic soft and hard surface structure has mixed electromagnetic boundary characteristics, in which the electromagnetic soft surface structure has the characteristic of stopband, which makes the electromagnetic wave energy in a certain frequency range unable to propagate. On the other hand, the electromagnetic hard surface structure can enhance the electromagnetic wave energy propagation in a certain frequency range. Because of the special electromagnetic characteristics of artificial electromagnetic soft and hard surface structure, it has a wide range of engineering applications in microwave and antenna fields. The previous study of electromagnetic soft and hard surface structure is mainly focused on numerical analysis of ideal electromagnetic soft and hard boundary conditions, but the design and application of artificial electromagnetic soft and hard surface structure have just started. The design and application of miniaturized electromagnetic soft and hard surface structure are urgently needed. This paper mainly studies the basic theory and design method of artificial electromagnetic soft and hard surface structure, the application of electromagnetic soft surface structure to the coupling between reducing antennas, and the design of metal cylinder stealth cloak based on electromagnetic hard surface structure. The paper mainly includes the following aspects: 1. The electromagnetic characteristics of the traditional electromagnetic soft surface structure and the variation law of the structure and size parameters are studied. The influence of the distance between periodic elements on the structure performance of the electromagnetic soft surface is discussed. Based on this, the design of the new artificial electromagnetic soft surface structure is guided. A wide band miniaturized electromagnetic soft surface structure is proposed. By loading gaps on the traditional strip electromagnetic soft surface structure, the center frequency is moved to low frequency, thus realizing miniaturization. The broadband effect is achieved by loading a zigzag structure on the edge of the strip. Compared with the electromagnetic soft surface structure in the latest paper on the electromagnetic soft surface structure published in the world, when the electromagnetic soft surface cell cycle is 8 mm, The center frequency is reduced from 6 GHz to 5 GHz and the relative bandwidth is increased from 8.1% to 12.5 GHz. When the electromagnetic soft surface structure is applied to reduce the coupling between microstrip antennas, the relative bandwidth of coupling reduction is increased from 2% to 8. 3. The properties of the electromagnetic hard surface structure and its variation with parameters and the electromagnetic scattering characteristics of the electromagnetic hard surface structure are studied. It is found that the strip hard surface structure has the characteristics of omnidirectional reduction of electromagnetic scattering under certain conditions. A design method of stealth cloak for metal cylinders based on electromagnetic hard surface structure is presented. Compared with other design methods of electromagnetic stealth cloak, this design has the advantages of simple structure, easy application and obvious effect on reducing electromagnetic scattering. Compared with the former electromagnetic hard surface structure, the cloak has wider bandwidth and thinner thickness. For example, when the center frequency is 4.2 GHz, the bandwidth increases from 14.3% to 22.2mm, and the thickness decreases from 9.41 mm to 2 mm.
【学位授予单位】:电子科技大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:O441.4
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