臺灣博碩士論文加值系統

在無線通訊中，天線將扮演非常重要的角色，無線傳遞需要透過天線來完成訊號的傳送與接收。在科技快速的發展下，穿戴式電子產品在市場上出現的頻率也越來越高。許多電子產品的操作頻率是2.4 GHz頻帶範圍內，例如使用藍芽傳輸系統、802.11b、802.11g和802.11n規格的無線區域網路，過多的使用者使得通訊的品質下降，本論文將針對802.11ac所規範的5 GHz頻帶去做天線之設計。
本論文提出以印刷偶極天線結合電磁能隙結構實現穿戴式裝置天線之應用。為了要有較高的傳輸速率，遂使用兩支天線去探討MIMO天線架構，並透過增加電流迴路來減少天線之間的耦合，MIMO天線的隔離度在頻帶內皆低於-15dB。全篇採用全波模擬軟體ANSYS HFSS，來模擬與設計天線架構。天線特性藉由實作量測驗證，量測之天線操作頻率範圍介於5.1至5.9 GHz，並在無反射天線實驗室進行量測，天線之前後比大於12 dB並且具有良好輻射場型。

In wireless communication, the antenna plays a very important role. The wireless transmission needs to complete the transmission and reception of signals through the antenna. With the rapid development of science and technology, wearable electronic products have become more frequent in the market. Many electronic products operate at frequency in the 2.4 GHz band, such as WLAN which uses the specification of 802.11b, 802.11g, and 802.11n, Bluetooth system. To many users have degraded the quality of communications. This thesis will design the antenna for the 5 GHz band specified by 802.11ac.
This thesis proposes the application of a printed dipole antenna combined with an electromagnetic bandgap structure to implement a wearable device antenna. In order to have a higher transmission rate, use two antennas to explore the MIMO antenna architecture and reduce the coupling between the antennas by increasing the current loop. The isolation of the MIMO antenna is lower than –15 dB in the frequency band. The full article uses full wave solver ANSYS HFSS to simulate and design the antenna architecture. Antenna characteristic are verified by actual measurement. The measured antenna operating frequency range is from 5.1 to 5.9 GHz and measured in a non-reflective antenna chamber. The front to back ratio is greater than 12 dB and has a good radiation pattern.

摘要 i
ABSTRACT iii
致謝 v
目錄 vi
圖目錄 viii
表目錄 xii
第一章 序論 1
1.1 研究動機 1
1.2 文獻回顧 5
1.3 論文架構 8
第二章 電磁能隙(EBG)結構設計與分析 9
2.1 電磁能隙結構原理 9
2.2 蘑菇狀(Mushroom-like)電磁能隙結構設計 13
第三章 天線結構設計與分析 18
3.1 印刷天線基本理論 18
3.2 覆背式電磁能隙印刷偶極天線設計 30
第四章 MIMO天線設計與分析 41
4.1 MIMO天線結構及原理 41
4.2 MIMO天線隔離度設計 44
第五章 實驗驗證 46
第六章 結論 54
參考文獻 55

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