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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 林怡成(Yi-Cheng Lin) | |
dc.contributor.author | Shih-Ting Liu | en |
dc.contributor.author | 劉詩亭 | zh_TW |
dc.date.accessioned | 2021-06-16T07:13:21Z | - |
dc.date.available | 2019-08-12 | |
dc.date.copyright | 2014-08-12 | |
dc.date.issued | 2014 | |
dc.date.submitted | 2014-07-03 | |
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Lazzi, “Increasing wireless channel capacity through MIMO systems employing co-located antennas,” IEEE Trans. Microwave Theory Tech., vol. 53, pp. 1837-1844, Jun. 2005. [41] Y. C. Lu and Y. C. Lin, “A compact dual-polarized UWB antenna with high port isolation,” IEEE Antennas and Propagation Society International Symposium 2010, pp.1-4, Jul. 2010. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/57945 | - |
dc.description.abstract | 本論文針對瑞雷衰落環境下,分集天線系統之表現進行數據探討,包含考慮來向波統計特性之相關係數、平均有效增益、以及有效分集增益。藉由分析ㄧ對半波長偶極天線,了解極化分集和天線距離對其表現之影響,進而研究兩對半波長偶極天線之分集表現。結果顯示當一天線具有極化分集特性時,其系統表現較不受天線間距離的影響。
本論文接著提出ㄧ針對未來第五代行動通訊發展、作用於30GHz毫米波頻段,適用於多輸入多輸出系統之雙埠雙極化之寬頻槽孔天線。其具有結合漸變縫隙以及方型開槽結構之合成槽孔和背腔式設計,使此天線有小型、寬頻、單向性輻射、極化分集及場形分集等良好特性。所設計天線之特性經過實驗證實在以10dB為基準的返回損失、隔離度和正上方正負25度內之輻射場型上都與數值模擬結果有良好的吻合度,其埠與埠隔離度更是優於 26dB。其平面式設計適合用於低成本之平面印刷式電路板製成,另其利用微帶線以及共平面波導做為與外部電路連結,亦可輕易與射頻電路做整合。本論文進ㄧ步利用該雙埠天線,提出一天線陣列架構,量測結果顯示其擁有18dB之埠與埠隔離度。最後,本論文利用前述分集系統表現佐證所提出之雙埠雙極化之超寬頻天線於多輸入多輸出系統上具有良好的增益,天線陣列亦如是。 | zh_TW |
dc.description.abstract | In this thesis, antenna diversity performance is discussed in Rayleigh fading environment, including the envelope correlation coefficient, the mean effective gain and the effective diversity gain under statistical arrival angles of the incident waves. By analyzing a pair of half-wavelength dipole antennas, the influences of polarization and space diversity to the diversity performance are investigated; then extend to the case of two-pair dipole arrays. The results show that when an antenna has the characteristic of polarization diversity, its diversity performances is less sensitive to the spacing between dipole pair.
This thesis presents a dual-port dual-polarized wideband aperture antenna operating at millimeter wave frequency 30 GHz for multiple-input multiple-output (MIMO) system applications and pre-5th generation mobile communication systems. With tapered aperture hybrid structure and backed cavity design, the antenna achieves wideband polarization diversity gain with unidirectional broadside radiation. Verified by experimental results, the antenna performance coincide with numerical results, including of 10dB return loss, isolation, and radiation patterns between +/- 25 degrees from zenith direction. The proposed antenna also possesses high port-to-port isolation better than 26dB. Its planar design indicates the suitability for the low-cost PCB manufacturing. And the out-fed design with the microstrip-line or coplanar waveguide, eases the integration with RF circuits. This thesis further proposes a 2 by 2 array to investigate the coupling effects on the port impedance, isolation and radiation patterns. The results show that it has good port-to-port isolation better than 18 dB. In the end, the diversity system performances of the proposed antenna are calculated to confirm its high effective diversity gain for MIMO system. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T07:13:21Z (GMT). No. of bitstreams: 1 ntu-103-R01942009-1.pdf: 3424512 bytes, checksum: 835456bd4e59b785cfc24c75b725aac9 (MD5) Previous issue date: 2014 | en |
dc.description.tableofcontents | 口試委員會審定書 #
誌謝 i 中文摘要 ii ABSTRACT iii CONTENTS v LIST OF FIGURES vii LIST OF TABLES xi Chapter 1 Introduction 1 1.1 Research Motivation 1 1.2 Organization of the Thesis 1 Chapter 2 Modeling of Antenna Diversity and MIMO Performances 3 2.1 Mobile Wireless Channel 3 2.2 Antenna Diversity Performance 4 2.2.1 Mean Effective Gain 4 2.2.2 Envelope Correlation Coefficient 9 2.2.3 Antenna Diversity Techniques 10 2.2.4 Diversity Combining Techniques 11 2.2.5 Effective Diversity Gain 15 2.3 MIMO Models and MIMO Systems 20 2.3.1 I.I.D. Model 20 2.3.2 Kronecker Model 21 2.3.3 Channel Capacity 22 2.4 Summary 22 Chapter 3 Simulation of Polarization Diversity on Cross Dipole Antennas 24 3.1 Introduction of Matlab Programs 24 3.2 Comparison of Parallel Dipole Pair and Cross Dipole Pair with Different Spacing 26 3.3 Summary 31 Chapter 4 A Dual-polarized Aperture Antenna with Backed Cavity for Future 5th-Generation MIMO Application 32 4.1 Introduction and Literature Survey 33 4.2 Antenna Configuration and Design 34 4.2.1 Design of a Dual-polarized Antenna Unit Cell 34 4.2.2 Design of Two by Two Antenna Array for MIMO Application 37 4.3 Simulation and Measurement Results 40 4.3.1 Results of Proposed Dual-polarized Antenna Unit Cell 40 4.3.2 Results of the Proposed Antenna with Rotation 50 4.3.3 Results of Proposed Two by Two Antenna Array 52 4.4 Diversity Performance Analysis of Proposed Antenna 59 4.4.1 Diversity Performance Analysis of Proposed Unit Cell 59 4.4.2 Diversity Performance Analysis of Proposed Array with Eight Branch Elements 63 4.5 Summary 67 Chapter 5 Conclusion 69 REFERENCE 71 | |
dc.language.iso | en | |
dc.title | 應用於5G行動通訊之雙極化槽孔天線之設計與實作 | zh_TW |
dc.title | Design and Implement of a Dual-Polarized Aperture Antenna
for Pre-5G Mobile Communication | en |
dc.type | Thesis | |
dc.date.schoolyear | 102-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 江簡富(Jean-Fu Kiang),陳富強(Fu-Chiarng Chen),林根煌(Ken-Huang Lin) | |
dc.subject.keyword | 毫米波,單向性輻射,極化分集,分集表現,封包相關係數,平均有效增益,有效分集增益,5G,多輸入多輸出, | zh_TW |
dc.subject.keyword | millimeter wave,unidirectional radiation,polarization diversity,diversity performance,envelope correlation coefficient,mean effective gain,effective diversity gain,5G,MIMO, | en |
dc.relation.page | 75 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2014-07-03 | |
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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