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研究生:練鴻傑
研究生(外文):LIEN, HUNG-CHIEH
論文名稱:應用於超高頻無線射頻辨識讀取器之圓極化天線設計
論文名稱(外文):Design of Circularly Polarized Antennas for UHF RFID Reader
指導教授:尤正祺
指導教授(外文):YU, CHENG-CHI
口試委員:黃正亮施權峰
口試委員(外文):HUANG CHENG-LIANGSHIH, CHUAN FENG
口試日期:2017-06-23
學位類別:碩士
校院名稱:逢甲大學
系所名稱:通訊工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2017
畢業學年度:105
語文別:中文
論文頁數:126
中文關鍵詞:圓極化天線UHF無線識別技術超高頻天線多層結構
外文關鍵詞:Circularly Polarized AntennaCP antennaUHF AntennaRadio Frequency IdentificationRFIDMulti-layer Structure
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本論文主要研究目標為圓極化天線的設計,應用於超高頻無線識別技術(UHF RFID) 上。本研究共提出三種不同應用的RFID讀取器圓極化天線,分別為共平面挖槽式設計,應用於國際規範頻帶;單極式縮小化天線設計,應用於臺灣規範;以及同樣應用於臺灣規範下的高增益圓極化天線。
首先,本文提出應用於符合UHF國際規範之全頻帶的圓極化天線設計,天線結構藉由共平面波導形式進行饋入,挖槽式天線架構,以及沿伸於接地面的L型短支。主要利用饋入短支來激發所需的共振頻帶,再利用接地L型短支來與天線耦合調整阻抗頻帶,並產生相位差,來增加圓極化特性。天線大小為100×100 〖mm〗^2,製作於玻璃纖維基板(FR4) 上。
第二支天線為應用於臺灣頻段的圓極化天線設計。天線主要以單極形式饋入,利用彎折來降低天線高度,再加入接地短支來產生不同電流路徑激發圓極化效果,最後以接地貼片來調整兩頻帶使其頻帶重合達到設計目標。天線尺寸為87×50 〖mm〗^2,同樣設計於玻璃纖維基板(FR4) 上,以降低生產成本。
第三支天線同樣為應用於臺灣頻帶設計,為增加增益,採用多層結構設計。饋入位於下層接地面穿入兩層基板之間,以倒L型立體金屬短支來耦合至上層天線輻射體,天線輻射體以挖槽形式加入三個不同形式的結構來設計。首先加入激發頻帶短支,產生基本頻率,接著於挖槽邊緣製作狹縫產生不連續以形成圓極化特性,最後以另一短支來調整頻寬,達到天線設計目標。
整體天線體積為120×120×30〖mm〗^2 。製作於兩層玻璃纖維基板(FR4)上,上層厚度為1.6mm,下層厚度為0.8mm。

The main target of this article is to design circularly polarized (CP) antenna for radio frequency identification (RFID) reader. There are three types of Ultra-High-Frequency (UHF) CP antennas presented in this research. These antennas have been fabricated on FR4 substrate. With the aid of FR4 substrate, the realization of the antenna could be easier and lower the price.
The first antenna is designed for global band UHF RFID Reader Antenna. Through coplanar-waveguide feeding, the feeding strip is extended to the center of the ground notch. An L-type strip is added at the ground ring to improve the circularly polarized effect. By optimally tunning the two strips, the antenna can reach optimal performances and be used in UHF RFID. The overall size of the antenna is
100×100×1.6 〖mm〗^3. The operation frequency band is 830MHz to 1010MHz. It can cover global UHF RFID applications.
The second antenna is designed for Taiwan UHF RFID reader. However, the size is smaller than the past published articles. The feeding structure is an inverted-L monopole antenna. In addition, adding a strip at the ground can generate circular polarization. By increasing the ground patch size, the antenna can be tuned to specified frequency band that is 922MHz to 928MHz. The overall dimension is 87×50×1.6 〖mm〗^3.

The last antenna is also developed for Taiwan UHF RFID Reader Antenna. It has higher gain than other antennas. The gain of the antenna is 5dBic. The antenna has double-substrate structure. With the stereoscopic feeding strip between the ground and the radiator, the radiator generates circular polarization wave. The antenna can be operated in 914MHz to 928MHz. The overall volume of the antenna is 120×120×30 〖mm〗^3。

目 錄
誌 謝 ii
摘 要 iii
Abstract v
目 錄 vii
圖目錄 x
表目錄 xvii
第一章 緒論 1
1.1 前言 1
1.2 研究動機 1
1.3 文獻探討 2
1.4 論文架構 4
第二章 天線理論 5
2.1 天線基本理論 5
2.1.1 天線原理與傳輸線理論 5
2.1.2 天線特性 11
2.1.4 天線阻抗 13
2.2 天線基本參數 13
2.2.1 共振頻率 13
2.2.3 反射損耗 (Return Loss) 14
2.2.4 增益 (Gain) 14
2.2.5 效率 (Efficiency) 14
2.3 天線極化 15
2.3.1 線極化 16
2.3.2 圓極化 17
2.4 天線種類 17
2.4.1 偶極天線 17
2.4.2 單極天線 19
2.4.3 共平面波導 20
2.4.4 倒L形天線 20
第三章 應用於UHF RFID共平面波導挖槽式圓極化讀取器天線 21
3.1. 概述 21
3.2. 天線設計結構與流程 22
3.3. 天線參數分析與討論 30
3.3.1 探討饋入短支與共振頻率的影響 30
3.3.2 探討天線饋入短支長度影響 34
3.3.3 探討天線L型接地短支長度影響 36
3.3.4 探討L型短支與天線距離影響 38
3.3.5 L型短支於天線的相對位置討論 40
3.3.6 探討天線寬度與L型短支寬度變化 42
3.4. 模擬與量測結果 45
3.5. 結論 51
第四章 應用於臺灣微小化共平面圓極化天線 52
4.1. 概述 52
4.2. 天線設計結構與流程 53
4.3. 天線參數分析與討論 62
4.3.1 討論天線饋入長度與共振頻率的影響 62
4.3.2 討論接地短支寬度變化影響 64
4.3.3 討論天線接地高度改變 66
4.3.4 討論天線基板大小對頻率影響 68
4.4. 模擬與量測結果 70
4.5. 結論 75
第五章 高增益之縮小化圓極化讀取器天線 76
5.1 概述 76
5.2 天線設計結構與流程 77
5.3 天線參數分析與討論 85
5.3.1 探討天線加入短支長度與共振頻率影響 85
5.3.2 探討插入短支的長度影響 87
5.3.3 探討狹縫寬度影響 89
5.3.4 探討狹縫位置影響 91
5.3.5 探討第二短支位置影響 93
5.4 模擬與量測結果 95
5.5 結論 102
第六章 總結 103
參考文獻 105


參考文獻

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