基于左手材料的小型化差分微带天线研究

发布时间：2018-01-19 10:51

本文关键词： 左手材料小型化差分天线带宽增益　出处：《山西大学》2014年硕士论文　论文类型：学位论文

【摘要】：无线通信技术的快速发展,促进了紧凑、全集成射频前端产品成为无线通信系统的设计主流。差分天线改变了传统的单端口设计方法,直接把差分信号馈入到天线的两个端口,为设计高集成的射频前端提供了有效的解决方案。微带天线因重量轻、剖面低、易于集成等诸多优点,已在诸多领域得到广泛的应用。因此,差分微带天线的研究引起了学者们的广泛关注。左手材料是自然界中不存在的人工周期结构,它具有介电常数和磁导率为负的特点。由于左手材料具有负折射、反常多普勒效应、完美透镜等奇异特点,因此左手材料具有潜在的应用价值。将左手材料应用于天线,提高天线性能成为一个越来越重要的研究方向。本文主要研究了基于左手材料的差分单频贴片天线和基于左手材料的差分双频缝隙天线。论文主要包括以下几部分内容：第一部分,简要介绍了差分微带天线和左手材料的研究现状。第二部分,首先介绍微带天线的基本概念和基础理论,包括微带天线的分类和馈电方式,表征天线性能的几个重要参数。其次介绍左手材料的概念,左手结构实现的理论依据及左手材料等效介质参数提取方法。第三部分,提出了一种应用于全球微波互联接入网络(Worldwide Interoperability for Microwave Access, WiMAX)的差分单频贴片天线,通过在辐射贴片刻蚀U型缝隙的方法实现天线的小型化。与传统的半波长天线相比,天线的尺寸为15 mm ×15 mm (0.38 λg × 0.38 Ag, Ag为天线的导波波长)。为了改善天线的带宽性能,设计了一种新型的哑铃型开口环金属线复合周期结构的左手材料,将左手材料作为天线的覆层。结果表明,覆层左手材料的差分单频贴片天线的带宽和增益均得到改善。第四部分,提出了一种应用于射频识别(Radio Frequency Identification, RFID)和无线局域网(Wireless Local Area Network, WLAN)的差分双频缝隙天线,通过弯折缝隙的方法实现天线的双频谐振和小型化特性。与传统的半波长天线相比,天线尺寸为60 mm × 60 mm (0.36 λg × 0.36 λg,λg为天线低频段的导波波长)。为了改善天线低频段带宽性能,设计了一种新型的双频段左手材料,将左手材料作为天线的覆层。结果表明,覆层左手材料的差分双频缝隙天线的带宽,增益及辐射特性均得到改善。
[Abstract]:With the rapid development of wireless communication technology, compact, fully integrated RF front-end products have become the mainstream of wireless communication system design. Differential antenna has changed the traditional single-port design method. The differential signal is fed directly to the two ports of the antenna, which provides an effective solution for the design of a high integrated RF front-end. The microstrip antenna has many advantages such as light weight, low profile, easy integration and so on. It has been widely used in many fields. Therefore, the research of differential microstrip antenna has attracted the attention of scholars. Left-handed materials are artificial periodic structures that do not exist in nature. It has the characteristics of negative dielectric constant and negative permeability due to the negative refraction, anomalous Doppler effect, perfect lens and other singular characteristics of left-handed materials. Therefore, left-handed materials have potential application value. Left-handed materials are used in antenna. Improving antenna performance has become a more and more important research direction. In this paper, the differential single-frequency patch antenna based on left-handed material and the differential dual-frequency slot antenna based on left-handed material are studied. Subsections:. Part one. The research status of differential microstrip antenna and left-handed material is briefly introduced. The second part introduces the basic concept and basic theory of microstrip antenna including the classification and feed mode of microstrip antenna. Several important parameters to characterize the antenna performance. Secondly, the concept of left-handed material, the theoretical basis for realization of left-handed structure and the method of extracting equivalent medium parameters of left-handed material are introduced. Part three. A worldwide Interoperability for Microwave Access for global microwave interconnection access network is proposed in this paper. The differential single-frequency patch antenna of WiMAX is miniaturized by etching the U-shaped slot in the radiation patch, compared with the traditional half-wavelength antenna. The size of the antenna is 15 mm 脳 15 mm, 0.38 位 g 脳 0.38 Ag. Ag is the guiding wavelength of the antenna. In order to improve the bandwidth performance of the antenna. A new type of left hand material for the composite periodic structure of the dumbbell-shaped open ring metal wire is designed. The left-handed material is used as the coating of the antenna. The results show that the left hand material can be used as the coating of the antenna. The bandwidth and gain of the Left-coated differential single-frequency patch antenna are improved. Part 4th. A new radio frequency identification (RFID) radio Frequency Identification is proposed. RFIDs and WLAN Wireless Local Area Network (WLAN) differential dual-frequency slot antennas. The dual-frequency resonance and miniaturization of the antenna are realized by bending slot, which is compared with the traditional half-wavelength antenna. The antenna size is 60mm 脳 60mm, 0.36 位 g 脳 0.36 位 g, 位 g is the guided wave wavelength of the antenna in low frequency band, in order to improve the bandwidth performance of the antenna at low frequency band. A new type of double-band left-handed material is designed. The left-handed material is used as the coating layer of antenna. The results show that the bandwidth, gain and radiation characteristics of the double-band slot antenna are improved.
【学位授予单位】：山西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN822

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