小型化及多频电磁带隙结构的研究

发布时间：2018-08-12 18:51

【摘要】：电磁带隙结构以其独特的性能吸引广大学者的研究兴趣，并已在微波领域尤其是天线领域得到广泛的应用。但是随着集成化电路的发展和频分复用技术的推广，当前的出现的电磁带隙结构难以满足这一变革的要求，因此电磁带隙结构需要朝着在小型化、多频化、宽带化的研究方向发展。本文着重提出了一款小型化电磁带隙结构、双频平面型高阻抗表面结构和具有三个频段的电磁带隙结构，并加以理论分析和实验验证。本文的主要研究内容.可概括为： 1、本文通过在ELV-EBG(the edge-located via mushroom-type EBG[43])的贴片表面加入“C”型槽，从而提出了一款小型化电磁带隙结构。该“C”型槽的引入，增加了贴片表面上的电流路径的长度，从而降低了电磁带隙结构的谐振频率。仿真结果表明该新型结构与具有相同尺寸的ELV-EBG相比，中心频率降低了2.5GHz,可实现缩减ELV-EBG近30.8%的尺寸。然后本文将提出的电磁带隙结构应用于天线阵以降低天线单元的耦合度。结果显示天线阵在引入该EBG结构后，，天线阵间的隔离度也得到了提高，同时天线单元的匹配特性得到改善。 2、本文通过采用在蘑菇型电磁带隙结构的贴片表面开槽的方法设计出一款具有三个频段的电磁带隙结构。仿真中发现该多频结构的三个频段可以通过改变细槽的尺寸来调整，因此该结构的三个频段可实现独立可调。 3、本文在本传统型平面型高阻抗表面结构的贴片上引入四个“Z”型槽，可显著降低该结构谐振频点.然后在此基础上，在通过在该结构基板的内部加载金属贴片形成多层结构，可进一步降低传统平面型高阻抗表面结构的谐振频点。
[Abstract]:Electromagnetic band-gap structure has attracted the interest of many scholars because of its unique performance, and has been widely used in the field of microwave, especially in the field of antenna. However, with the development of integrated circuits and the popularization of frequency division multiplexing technology, the current electromagnetic band gap structure is difficult to meet the requirements of this change, so the electromagnetic band gap structure needs to be miniaturized and multi-frequency. The research direction of broadband is developing. In this paper, a miniaturized electromagnetic band gap structure, a dual frequency planar high impedance surface structure and an electromagnetic band gap structure with three frequency bands are proposed, which are theoretically analyzed and verified by experiments. The main content of this paper. It can be summarized as follows: 1. A miniaturized electromagnetic band gap structure is proposed by adding "C" groove on the surface of ELV-EBG (the edge-located via mushroom-type EBG [43]) patch. The introduction of the "C" slot increases the length of the current path on the surface of the patch, thus reducing the resonant frequency of the electromagnetic band-gap structure. The simulation results show that compared with ELV-EBG with the same size, the center frequency of the new structure is reduced by 2.5 GHz, and the size of ELV-EBG can be reduced by nearly 30.8%. Then the proposed electromagnetic band gap structure is applied to the antenna array to reduce the coupling degree of antenna elements. The results show that the isolation degree of the antenna array is improved after the introduction of the EBG structure. At the same time, the matching characteristics of antenna elements are improved. 2. In this paper, a three-band electromagnetic band gap structure is designed by using the method of grooving on the patch surface of mushroom type electromagnetic band gap structure. In the simulation, it is found that the three bands of the multi-frequency structure can be adjusted by changing the size of the thin slot. Therefore, the three frequency bands of the structure can be adjusted independently. 3. In this paper, four "Z" slots are introduced into the patch of the traditional planar high impedance surface structure, which can significantly reduce the resonance frequency of the structure. On this basis, the resonant frequency of the traditional planar high impedance surface structure can be further reduced by loading the metal patch inside the substrate to form a multilayer structure.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN820

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