基于超材料的TD-LTE极化可重构天线设计

发布时间：2018-05-06 13:55

本文选题：TD-LTE + 超材料　；参考：《大连海事大学》2017年硕士论文

【摘要】：时分长期演进(Time Division Long Term Evolution,TD-LTE)是一种专门为移动高宽带应用而设计的无线通信标准。在TD-LTE通信系统中,常常采用多天线、双极化传输技术,以达到充分利用空间资源,提升通信系统容量的目的。为了满足现代通讯系统对天线性能"灵活多变"的需要,极化可重构天线应运而生。极化可重构天线可以改变天线的极化方式,增加天线的应用范围,因此具有广泛的应用前景。近年来,各种结构的超材料不断涌现,将其特殊的电磁特性应用于天线设计中,可以通过机械的方式使天线实现极化可重构,从而避免了电控极化可重构天线中偏置器件带来的各种问题,简单、易于实现。目前,超材料加载极化可重构微带天线大多工作于单极化方式下,超材料加载极化可重构双极化微带天线的研究很少见,因此,本文研究应用于TD-LTE通信系统的超材料加载极化可重构双极化天线的设计与实现方法。本论文的主要工作和成果可概括为:根据微带天线理论设计工作于TD-LTE频段的缝隙耦合双极化微带贴片天线。在此基础上,通过加载一层不同结构的超材料表面设计了三款TD-LTE频段的超材料加载极化可重构双极化天线,这三款天线的结构和功能分别是:(1)基于十字形结构的超材料设计了一款中心频率为2.345GHz的超材料加载±45°极化微带天线,通过机械方式旋转超材料表面可使天线改变为水平/垂直极化,从而实现极化可重构。(2)基于正方形切角的超材料结构设计了一款中心频率为2.605GHz的超材料加载左/右旋圆极化微带天线,通过机械方式旋转超材料表面可使天线改变为水平/垂直极化,实现极化可重构。(3)基于双扇形结构的超材料设计了一款中心频率为2.605GHz的超材料加载左/右旋圆极化微带天线,通过机械方式旋转超材料表面可使天线改变为±45°极化,实现极化可重构。运用电磁仿真软件HFSS分别对三款天线进行了仿真设计和优化设计,并对设计好的超材料加载缝隙耦合微带天线进行了加工、测试。结果表明,本文设计的三款双极化天线工作在TD-LTE频段,能够实现预期的极化可重构,且在各种极化状态下天线都具有良好的性能,达到了设计要求。
[Abstract]:Time Division Long Term Evolution (TD-LTET) is a wireless communication standard specially designed for mobile high broadband applications. In TD-LTE communication systems, multi-antenna and dual-polarization transmission techniques are often used to make full use of space resources and enhance the capacity of communication systems. In order to meet the need of flexible antenna performance in modern communication system, polarized reconfigurable antenna emerges as the times require. Polarization reconfigurable antenna can change the polarization mode of antenna and increase the application range of antenna, so it has a wide application prospect. In recent years, supermaterials of various structures have been emerging, and their special electromagnetic characteristics can be used in antenna design. The antenna can be polarized and reconfigurable by mechanical means. In order to avoid all kinds of problems caused by the bias device in the electronic controlled polarization reconfigurable antenna, it is simple and easy to realize. At present, the supermaterial loaded polarization reconfigurable microstrip antenna mostly works in the single polarization mode. The research of the supermaterial loaded polarization reconfigurable dual polarization microstrip antenna is rare, so, In this paper, the design and implementation of supermaterial loaded polarimetric reconfigurable dual polarization antenna for TD-LTE communication system is studied. The main work and results of this thesis can be summarized as follows: according to the theory of microstrip antenna, the slot coupled dual-polarized microstrip patch antenna working in TD-LTE band is designed. On the basis of this, three supermaterial loaded polarization reconfigurable dual-polarization antennas in TD-LTE band are designed by loading a layer of metamaterials with different structures. The structure and function of the three antennas are respectively 1: 1) based on the cross structure of the supermaterial, a supermaterial with center frequency of 2.345GHz loaded 卤45 掳polarized microstrip antenna is designed. Rotating the surface of the metamaterials mechanically changes the antenna to horizontal / vertical polarization. Thus, polarization reconfigurable. 2) based on the square tangent angle supermaterial structure, a supermaterial loaded left / right circular polarized microstrip antenna with center frequency of 2.605GHz is designed. By mechanically rotating the surface of the metamaterial, the antenna can be changed to horizontal / vertical polarization, and the polarization can be reconfigurable. (3) based on the dual-sector structure, a supermaterial with center frequency of 2.605GHz loaded left / right circularly polarized microstrip antenna is designed. The antenna can be changed to 卤45 掳polarization by mechanically rotating the surface of the metamaterial, and the polarization can be reconstructed. The electromagnetic simulation software HFSS is used to simulate and optimize the three antennas, and the microstrip antenna loaded with supermaterial is machined and tested. The results show that the three dual-polarization antennas designed in this paper work in the TD-LTE band and can realize the expected polarization reconfiguration. The antenna has good performance and meets the design requirements in various polarization states.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN822;TN929.5

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