臺灣博碩士論文加值系統

本篇論文提出一個小型化多頻帶平面多輸入多輸出(Multiple-Input Multiple-Output, MIMO)天線設計，此天線整合全球行動通訊系統(Global System for Mobile, GSM)、長期演進技術(Long Term Evolution, LTE)與超寬頻帶(Ultra-Wideband, UWB)等無線通訊應用，MIMO天線由兩個多頻帶平面單極天線背對背擺放所組成，彼此距離900MHz的十分之一波長。單一天線元件由一個UWB天線寄生出多附載捲曲線段組合，產生GSM、LTE與UWB多個頻帶，天線輻射主體不含接地面的尺寸為30mm x 28mmm。利用天線元件有場型的不對稱性，在900MHz有較低的耦合量。除此之外，設計一個吸收共振器改進1.8GHz與2.2GHz的耦合，量測所有操作頻帶隔離度皆降到-20dB以下。

This thesis presents a compact multiband planar MIMO antenna that covers the standards of the Global System for Mobile (GSM), Long Term Evolution (LTE) and Ultra-Wideband (UWB). The MIMO antenna contains two printed back-to-back multiband monopole elements with a closed distance of one-tenth wavelength of 900MHz. The element in the MIMO antenna is structured by merging an UWB antenna and a parasitic multi-loaded winding line monopole that is capable of providing the broadband coverage for the standards of the GSM, LTE and UWB. The size of the antenna element without ground plane was 30mm x 28mm. Because of the asymmetric element radiation pattern and, thus the MIMO antenna exhibits the desirable low mutual coupling effect at 900MHz frequency band. Further, a pair of meta-material resonator is constructed and placed between antenna elements in order to improve the correlation coefficient at 1.8GHz and 2.2GHz bands. The measured isolations of the prototype are less than -20 dB in all operating frequency bands.

摘要 i
ABSTRACT ii
誌謝 iii
目錄 iv
表目錄 v
圖目錄 vi
第一章 緒論 1
1.1 研究背景 1
1.2 研究目的 2
第二章 相關理論 3
2.1 天線輻射原理 3
2.2 超寬頻帶 7
2.3 MIMO無線接取技術 8
2.4 通訊系統常用頻帶 11
第三章 多頻帶多輸入多輸出平面天線 12
3.1 概述 12
3.2 多頻帶天線設計及量測 12
3.3 多頻帶多輸入多輸出平面天線設計及量測 27
第四章 結論 42
參考文獻 43

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