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研究生:陳英傑
研究生(外文):Ying-Chieh Chen
論文名稱:具有T型匹配網路與短路板設計之射頻辨識標籤天線
論文名稱(外文):Design of RFID Tag Antenna with T-Matching Network and Shorting Plates
指導教授:林明星林明星引用關係
指導教授(外文):Ming-Shing Lin
學位類別:碩士
校院名稱:國立雲林科技大學
系所名稱:電機工程系碩士班
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:2009
畢業學年度:97
語文別:中文
論文頁數:121
中文關鍵詞:短路板T型匹配網路射頻辨識系統標籤天線
外文關鍵詞:RFIDtag antennaT-matching networkshorting plates
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本論文提出一低成本、可貼附於金屬物體表面之被動式超高頻無線射頻辨識標籤天線。此天線由一T型匹配網路附有電感性耦合饋入迴圈、二對稱貼片天線、二短路板、一金屬接地板、FR-4玻璃纖維基板及一空氣層組成。FR-4基板厚度1.6 mm,介電係數4.6,標籤天線整體尺寸為91.2 mm × 53.25 mm × 4.6 mm 。
金屬接地板之構造使天線貼附於金屬物體表面時性能不會有劇烈之衰減。配合不同廠牌標籤晶片阻抗有所差異,可經由簡單地調整饋入元件尺寸即可整調天線輸入阻抗,同時天線輻射體結構將不受影響。
本天線工作頻帶902 – 928 MHz,放置於自由空間中及距離300 mm x 300 mm x 1 mm 金屬板表面30 mm 處所測量讀取距離分別為 6.23 m及 7.07 m。本天線經由模擬與實際測量具高度一致性。
In this paper, a low-cost novel antenna for passive UHF radio frequency identification (RFID) tags mountable on metallic surface is presented.The proposed antenna consists of a T-matching network with a inductively-coupled feed loop,two symmetrical radiating patches shorted to ground plane by shorting plates,a FR-4 substrate and air layer.The substrate FR4 has a thickness of 1.6mm and relative permittivity of 4.6.Overall dimension of the proposed antenna is 91.2 mm × 53.25 mm × 4.6 mm .
Because the proposed antenna has the ground plane,the performance of the antenna has not been changed much when the tag is attached on metallic surface.By simply adjusting the size of the feeding element,desired impedance for any microchip can be achieved without significant modification of the radiating element.
The proposed antenna operate from 902 to 928 MHz.When the antenna is placed in free space and close to 300 mm x 300 mm x 1 mm metallic plate 30 mm away ,the maximun reading distance is 6.23 m and 7.07 m,respectively.The proposed design is verified by simulation and measurement,which show good agreement.
中文摘要 --------------------------------------------------------------- i
英文摘要 --------------------------------------------------------------- ii
誌謝 --------------------------------------------------------------- iii
目錄 --------------------------------------------------------------- iv
表目錄 --------------------------------------------------------------- v
圖目錄 --------------------------------------------------------------- vi
第一章 緒論----------------------------------------------------------- 1
1-1 前言----------------------------------------------------------- 1
1-2 研究動機與目的------------------------------------------------- 2
1-3 文獻回顧------------------------------------------------------- 2
1-3-1 阻抗匹配技術--------------------------------------------------- 3
1-3-2 尺寸縮小化技術------------------------------------------------- 11
1-3-3 降低金屬對天線效能影響之技術----------------------------------- 17
1-4 研究方法------------------------------------------------------- 23
1-5 論文大綱------------------------------------------------------- 25
第二章 射頻辨識系統簡介----------------------------------------------- 26
2-1 射頻辨識系統的基本架構----------------------------------------- 26
2-2 射頻辨識系統運作方式------------------------------------------- 29
2-3 射頻辨識系統標籤分類------------------------------------------- 30
2-4 射頻辨識標籤特性----------------------------------------------- 36
第三章 射頻辨識標籤天線之特性要求------------------------------------- 37
3-1 天線基本參數--------------------------------------------------- 37
3-1-1 指向性與增益--------------------------------------------------- 37
3-1-2 有效等向輻射功率 ---------------------------------------------- 41
3-1-3 天線輸入阻抗--------------------------------------------------- 44
3-1-4 反射係數與駐波比----------------------------------------------- 45
3-2 標籤天線與晶片之最大功率傳送----------------------------------- 48
3-3 射頻辨識標籤讀取距離公式推導----------------------------------- 50
3-4 標籤天線設計策略----------------------------------------------- 56
第四章 射頻辨識標籤天線模擬與量測------------------------------------- 59
4-1 標籤天線分析與模擬--------------------------------------------- 59
4-2 標籤天線量測--------------------------------------------------- 90
4-2-1 射頻標籤天線阻抗量測------------------------------------------- 90
4-2-2 射頻標籤天線場型量測------------------------------------------- 98
4-2-3 射頻標籤天線讀取距離量測--------------------------------------- 102
第五章 結論----------------------------------------------------------- 106
參考文獻 --------------------------------------------------------------- 107
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