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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 陳士元 | |
dc.contributor.author | Shih-Chia Chiu | en |
dc.contributor.author | 邱詩家 | zh_TW |
dc.date.accessioned | 2021-06-16T10:56:16Z | - |
dc.date.available | 2018-08-14 | |
dc.date.copyright | 2013-08-14 | |
dc.date.issued | 2013 | |
dc.date.submitted | 2013-08-08 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/61255 | - |
dc.description.abstract | 本論文係以複合式左右手傳輸線實現兩款新型共振式微型天線,並藉由設計終端負載電路,使得天線分別具有雙頻以及頻率可調之功能。
首先,為使複合式左右手傳輸線天線具雙頻特性並能同時工作在兩個零階共振模態,本論文利用傳輸線理論以及等效電路模型對複合式左右手傳輸線的特性進行分析,並檢驗非平衡式傳輸線在末端開路或短路邊界條件下,兩個零階共振模態的共振機制及其行為表現。根據末端邊界條件之影響及共振器的共振行為,本論文提出多款終端負載電路之設計用以取代傳統開路或短路邊界條件。與一般只能操作在單一零階共振模態之複合式左右手傳輸線天線相較,本論文所提出的負載電路設計不僅可使此雙頻天線同時工作在零階串聯及零階並聯共振頻率,且在兩個操作頻率間具有類似的輸入阻抗變化、相似的輻射場型以及輻射特性。 而在第二款天線設計中,本論文利用一負載於複合式左右手傳輸線末端之接地電容,使其於傳輸線能隙頻帶內產生共振,並利用此共振結構設計天線。由所提出之分析理論可知,改變末端負載電容值,其共振頻率也隨之改變,因此利用一變容二極體,即可透過調整偏壓改變此共振天線的操作頻率,使之於操作頻帶內連續變化。另外,由於此天線操作於不同頻率時皆具有相同的共振機制,因此此頻率可調天線於工作頻帶內皆具有相似的輻射場型及平坦的輻射增益、效率。 本論文提出數種負載電路的設計方法、設計公式,並應用於複合式左右手傳輸線天線之設計。所提出之天線皆具有良好的輻射特性,且其尺寸小巧,非常適合無線通訊系統之應用。 | zh_TW |
dc.description.abstract | Two resonant-type composite right/left-handed transmission line (CRLH TL) antennas terminated with novel termination circuits are proposed in the dissertation for dual-band and frequency-tunable operations, respectively.
First, for dual-band operation, the transmission line approach and equivalent circuit model are used to analyze the characteristics of the CRLH TLs and justify the absence of one of the two zeroth-order resonances in conventional unbalanced CRLH TL resonators using open or short terminations. Then, according to the termination effects and resonant behaviors, a series of termination circuits for unbalanced CRLH TLs are proposed to enable simultaneous excitation of the zeroth-order series and shunt resonances. The proposed termination circuits are very simple and consist merely of a capacitor or inductor in series/parallel with a parallel/series LC tank. Unlike conventional dual- or multi-band zeroth-order resonator (ZOR) antennas formed by open- or short-ended CRLH TLs, in which only one of the zeroth-order resonances can be excited, the proposed ZOR antennas can operate simultaneously at the zeroth-order series and shunt resonances when the proposed termination circuits are applied. Also, it is demonstrated that the proposed antennas have similar input impedance responses, radiation patterns, and peak gains within the two operating bands. Secondly, for frequency agility, it is shown that a capacitor as the termination for a CRLH TL is needed for excitation of the anti-resonance within the band-gap region. It is also shown that the resonant frequency will vary with the termination capacitance. Therefore, by utilizing a varactor diode as the termination, the termination capacitance can be controlled by changing its bias voltage, and the resonance of the antenna can thus be tuned within its band-gap region. For verification, a prototype antenna based on the asymmetric coplanar strip configuration was fabricated and tested. It has a continuously tunable resonant frequency between 2.15 GHz and 2.8 GHz as the bias voltage is adjusted in between 4 V and 22 V. When tuned to resonate at different frequencies in the band gap, the antenna still exhibits similar radiation pattern and stable peak gain and radiation efficiency owing to the same resonant mechanism in the band gap. In the dissertation, design formulas to estimate the element values of the termination circuits for given frequencies are derived, and some design considerations are discussed as well. Both of the proposed antennas have satisfactory radiation performances and a compact size and are therefore suitable for wireless communication applications. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T10:56:16Z (GMT). No. of bitstreams: 1 ntu-102-F96942016-1.pdf: 6269424 bytes, checksum: 2f1bf2672c63b9747d636ce6b8a31755 (MD5) Previous issue date: 2013 | en |
dc.description.tableofcontents | 口試委員會審定書 i
誌謝 iii 摘要 v Abstract vii Contents ix List of Figures xii List of Table xvii Chapter 1 Introduction 1 1.1 Motivation 1 1.2 Literature Survey 1 1.3 Contribution 7 1.4 Chapter Outlines 9 Chapter 2 Composite Right/Left Handed Transmission Line 12 2.1 Ideal Homogeneous CRLH TLs 12 2.2 LC Network Implementation 18 2.2.1 Dispersion Relation of LC-Based CRLH TL 21 2.2.2 Characteristic Impedance 23 2.3 Implementations of CRLH TLs 24 2.3.1 Effective Medium Parameters 26 2.3.2 Equivalent Circuit Parameters of CRLH TL 28 2.3.3 Design Guidelines for CRLH TLs 30 2.4 Zeroth-Order Resonances 32 2.4.1 Resonant Principles 32 2.4.2 Characteristics of CRLH TL Resonators 34 2.4.3 Characteristic of Miniaturized Antenna Using ZOR 36 Chapter 3 Dual-Band, Compact CRLH CPW ZOR Antenna Using Novel Termination Circuits 38 3.1 Introduction 38 3.2 Zeroth-Order Resonances and CRLH CPW Unit Cells 40 3.3 Termination Effects on Zeroth-Order Resonances and the Proposed Termination Circuits 44 3.3.1 Pseudo-Open Termination for CRLH TLs with fse < fsh 48 3.3.2 Pseudo-Open Termination for CRLH TLs with fse > fsh 51 3.3.3 Pseudo-Short Termination Circuits 54 3.4 Application in Dual-Band ZOR Antennas 57 3.4.1 ZOR Antenna Formed by CRLH CPW with fse < fsh 58 3.4.2 ZOR Antenna Formed by CRLH CPW with fse > fsh 63 3.4.3 Discussion 67 3.5 Summary 69 Chapter 4 Compact CRLH Asymmetric-CPS Antenna with Frequency Agility within Band-Gap Region 70 4.1 Introduction 70 4.2 Unit Cell Design and Termination Capacitor 72 4.3 Compact CRLH ACPS Antenna Using Capacitive Termination 77 4.4 Frequency-Agile Compact CRLH ACPS Antenna Terminated by a Varactor Diode 83 4.5 Summary 88 Chapter 5 Conclusion and Future Works 89 5.1 Conclusion 89 5.2 Future Works 91 Reference 93 Publication List of Shih-Chia Chiu 104 | |
dc.language.iso | en | |
dc.title | 以新型終端負載電路實現具雙頻及頻率可調之複合式左右手傳輸線微型天線 | zh_TW |
dc.title | Dual-Band and Frequency-Agile, Compact Composite Right/Left-Handed Transmission Line Antennas Using Novel Termination Circuits | en |
dc.type | Thesis | |
dc.date.schoolyear | 101-2 | |
dc.description.degree | 博士 | |
dc.contributor.oralexamcommittee | 李學智,許博文,楊成發,曾昭雄,陳念偉 | |
dc.subject.keyword | 複合式左右手傳輸線,微型天線,雙頻,頻率可調,零階共振, | zh_TW |
dc.subject.keyword | composite right/left-handed transmission line (CRLH TL),dual-band,frequency-tunable,zeroth-order resonance,zeroth-order resonator (ZOR) antennas,band gap, | en |
dc.relation.page | 105 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2013-08-09 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 電信工程學研究所 | zh_TW |
顯示於系所單位: | 電信工程學研究所 |
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