可調(diào)諧器件是現(xiàn)代無(wú)線通信系統(tǒng)的重要組成部分。向列相液晶（NLC）作為一種新型調(diào)諧元件,其工作頻段可達(dá)10 GHz以上且具有低損耗特性。本文旨在研究適用于微波天線結(jié)構(gòu)的液晶NLC的電磁特性,液晶可調(diào)諧特性,液晶結(jié)構(gòu)設(shè)計(jì)及其潛在應(yīng)用,并設(shè)計(jì)一種基于向列相液晶的可調(diào)諧裝置,使之能夠與傳統(tǒng)天線結(jié)構(gòu)整合并實(shí)現(xiàn)移相效果。本論文由以下五部分組成。第一部分,通過(guò)液晶材料的理論分析,對(duì)液晶分子取向角的廣義方程進(jìn)行了推導(dǎo),得到了方位角和液晶響應(yīng)時(shí)間的微分方程解的數(shù)值方法。并采用有限差分方法進(jìn)行分析,由此方向角獲得了較傳統(tǒng)方法更為精確的結(jié)果。第二部分,提出一種新型電倒置微帶線移相器裝置,通過(guò)交流控制向列相液晶分子取向角,實(shí)現(xiàn)了NLC分子排列順序的改變。交流偏置電壓從0 V增加到20V時(shí),器件的相移變化為45°,插入損耗從0.56 dB改變?yōu)?.06 dB。同時(shí),品質(zhì)因數(shù)值達(dá)到76.15°/dB。第三部分,對(duì)于可調(diào)的單波束天線,提出了一種液晶可調(diào)的半模基片集成漏波天線（HMSIW-LWA）,并通過(guò)引入過(guò)渡結(jié)構(gòu),提高HMSIW-LWA輸入功率輻射模式的效率。通過(guò)對(duì)新型基于NLC調(diào)諧介質(zhì)特性的研究,有效的控制了液... 

【文章來(lái)源】：哈爾濱工業(yè)大學(xué)黑龍江省 211工程院校 985工程院校

【文章頁(yè)數(shù)】：127 頁(yè)

【學(xué)位級(jí)別】：博士

【文章目錄】：
摘要
Abstract
Nomenclature
Chapter 1 Introduction
    1.1 The Research Background
    1.2 Objective
    1.3 Significance of the Research
    1.4 Literature Review and Related Work
    1.5 The Main Research Contents
Chapter 2 Novel IMSL Phase Shifter by Using NLC
    2.1 Introduction
    2.2 Fundamentals of LC
    2.3 Electromagnetic Properties of LC
        2.3.1 Dielectric Properties of LC
        2.3.2 Magnetic Properties of LC
        2.3.3 Benchmark Values of The Tunable Material
    2.4 The Continuum Theories and Energy Formulations of LC
        2.4.1 The Oseen-Frank Energy
        2.4.2 The Theory of Response to The Electric and Magnetic Fields
        2.4.3 The Extra-ordinary and Ordinary Waves of N-LC
        2.4.4 Derivation of Generalized Orientation Angle θ Equation
        2.4.5 Finite-Difference Method of Solution
        2.4.6 Response Time for LC
    2.5 A Novel IMSL Phase Shifter Based on LC
        2.5.1 Preliminary Analysis of Phase Shifter
        2.5.2 Design Considerations of IMSL Phase Shifter
    2.6 Electric Biasing Concepts for IMSL Phase Shifter
    2.7 Simulation Results for IMSL Phase Shifter
    2.8 The Summary of the Chapter
Chapter 3 Tunable HMSIW-LWA
    3.1 Introduction
    3.2 Fundamentals of HMSIW Structure
    3.3 The Electric Biasing Technique for HMSIW-LC Device
    3.4 The Analysis of HMSIW Unit-Cell
        3.4.1 Bloch Impedance
        3.4.2 Impedance Matching
        3.4.3 Radiating Element of HMSIW
        3.4.4 The Equivalent Circuit
    3.5 Tunable HMSIW-LWA Fed Rectangular Patch based on LC
    3.6 Simulation Results for HMSIW-LWA
    3.7 The Summary of the Chapter
Chapter 4 Novel Tunable Dual-Beam （?）-Shaped MLWA
    4.1 Introduction
    4.2 Analytical of the Radiation Pattern for Dual-Beam MLWA
    4.3 The Electric Biasing Concepts for （?）-shaped MLWA
    4.4 Analysis of （?）-shaped MLWA Unit-Cell
        4.4.1 The Equivalent Circuit
        4.4.2 Bloch Impedance
    4.5 Tunable Dual-Beam for （?）-shaped MLWA based on LC
    4.6 Simulation Results for MLWA
    4.7 Measurement Results for MLWA
    4.8 The Summary of the Chapter
Chapter 5 Tunable Frequency for （?）-Shaped Microstrip Patch Array
    5.1 Introduction
    5.2 Analysis of （?）-Shaped Patch Antenna
        5.2.1 Transmission Line Model
        5.2.2 Cavity Model
    5.3 Single （?）-Shaped Patch Antenna
        5.3.1 Equivalent circuit
        5.3.2 Scattering Parameter
        5.3.3 Radiation Pattern
    5.4 Analysis of Antenna Array
    5.5 Electric Biasing Concepts for （?）-shaped Patch Array
    5.6 Tunable Frequency for （?）-Shaped Patch Array Based on LC
    5.7 Simulation Results for Antenna Array
    5.8 The Summary of the Chapter
Conclusions
Future Work
References
Papers published in the period of Ph D education
Acknowledgement
Curriculum Vitae
Appendix



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