频率可灵活配置的无线通信系统MIMO天线研究

发布时间：2021-12-24 07:16

　　近年来,频率可重构天线因其能够响应系统要求和环境条件调整工作频带而在现代无线应用中引起了越来越多的关注。许多新应用需要研究和设计频率可重构天线,如认知无线电（CR）,先进移动技术,设备到设备通信,多输入多输出（MIMO）系统等。频率可重构天线可以与MIMO系统结合使用,以获得频率可重构天线提供的优势,同时保持MIMO功能。频率可重构MIMO天线可以增强信道容量并提供更高的数据速率传输。因此,具有MIMO配置的频率可重构天线对于现代无线通信系统是非常期望的。本文目的是设计和实现具有紧凑尺寸的MIMO配置的新型频率可重构天线,适用于无线手持设备。本研究中提出的天线提供了宽范围的连续频率调谐,同时保持了良好的MIMO性能。此外,还提出了一种能够进行传感和通信的单个天线用于CR应用。在这些设计中采用薄型结构（贴片,槽和单极）。所提出的设计的优点是其紧凑的原型,成本有效,低轮廓,平面结构和宽频率可重配置性,每个天线元件仅使用一个变容二极管。本文首先提出了一种基于微带馈线的双频段可重构MIMO贴片天线设计。天线包括四个对称放置的矩形贴片天线元件。将双重用途的六边形缺陷接地结构（DGS）引入接地平面... 

【文章来源】：华北电力大学(北京)北京市 211工程院校 教育部直属院校

【文章页数】：124 页

【学位级别】：博士

【文章目录】：
Abstract
摘要
Acronyms and Abbreviations
List of Symbols
Chapter 1 Introduction
    1.1 Motivation
    1.2 Objectives
    1.3 Research Contributions
    1.4 Thesis Organization
Chapter 2 The Background of Frequency Reconfigurable MIMO Antennas
    2.1 Reconfigurable Antennas
        2.1.1 Classification of Reconfigurable Antennas
        2.1.2 Reconfiguration Methods Employed to Implement Reconfigurable Antennas
            2.1.2.1 Frequency Reconfiguration using RF-MEMS
            2.1.2.2 Frequency Reconfiguration using PIN Diodes
            2.1.2.3 Frequency Reconfiguration using Varactor Diodes
        2.1.3 Applications of Frequency Reconfigurable Antennas
            2.1.3.1 Cognitive Radio
    2.2 Review of Previously Designed Frequency Reconfigurable Antennas
        2.2.1 Frequency Reconfigurable Patch Antennas
        2.2.2 Frequency Reconfigurable Slot Antennas
        2.2.3 Frequency Reconfigurable Monopole Antennas
    2.3 Frequency Reconfigurable MIMO Antennas
        2.3.1 Review of Previously Designed Frequency Reconfigurable MIMO Antennas
    2.4 Research Gaps to be Filled
Chapter 3 Frequency Reconfigurable Patch Antennas with Reconfigurable MicrostripFeedline
    3.1 A Compact Frequency Reconfigurable Patch Antenna with Agile MicrostripFeedline
        3.1.1 Introduction
        3.1.2 Antenna Geometry
        3.1.3 Results
            3.1.3.1 S-Parameters
            3.1.3.2 Gain Patterns and Efficiency
            3.1.3.3 State-of-the-Art-Comparison
    3.2 Two-Element Frequency Agile MIMO Patch Antenna with Agile FeedingMechanism
        3.2.1 Introduction
        3.2.2 Antenna Structure
        3.2.3 Results
            3.2.3.1 Isolation Results
            3.2.3.2 Radiation Patterns
            3.2.3.3 Envelope Correlation Coefficient
    3.3 Four-Element Dual Band Frequency Reconfigurable MIMO Patch-Slot AntennaBased on Reconfigurable Microstrip Feedline
        3.3.1 Introduction
        3.3.2 Antenna Layout
            3.3.2.1 Antenna Configuration
            3.3.2.2 Single Element Antenna
        3.3.3 Results and Discussion
            3.3.3.1 S-Parameters
            3.3.3.2 Radiation Patterns and Efficiency
            3.3.3.3 Envelope Correlation Coefficient
    3.4 Conclusion
Chapter 4 An Eight-Element Frequency Reconfigurable MIMO Slot Antenna with Multi-Band Tuning Characteristics
    4.1 Introduction
    4.2 Antenna Layout
        4.2.1 Biasing Circuit
    4.3 Simulated vs Measurement Results
        4.3.1 S-Parameters
        4.3.2 Radiation Patterns and Efficiency
        4.3.3 ECC and TARC
        4.3.4 Current Distribution
        4.3.5 State-of-the-Art-Comparison
    4.4 Conclusion
Chapter 5 A Reconfigurable MIMO/UWB MIMO Antenna Design for Cognitive RadioApplications
    5.1 Introduction
    5.2 Antenna Layout
        5.2.1 UWB MIMO Sensing Antenna
        5.2.2 Reconfigurable MIMO Antenna
    5.3 Results
        5.3.1 UWB MIMO Spectrum Sensing Mode
        5.3.2 Frequency Reconfigurable MIMO Mode
        5.3.3 Radiation Patterns and Efficiency
        5.3.4 Envelope Correlation Coefficient
        5.3.5 Current Distribution
        5.3.6 State-of-the-Art-Comparison
    5.4 Conclusion
Chapter 6 Conclusion and Future Work
    6.1 Conclusion
    6.2 Future Work
References
Published Papers
Acknowledgements
About the Author



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