臺灣博碩士論文加值系統

本論文研究主題為應用於超高頻無線射頻辨識系統手持式讀取器天線之設計，論文為設計三款不同尺寸之讀取器天線，所述之無線射頻辨識讀取器天線操作於UHF頻段。第一款讀取器天線搭配反射元件調節機制，並藉由蜿蜒路徑來減少天線尺寸天線在915MHz之最大增益為4.85dBi，戶外量測最遠讀取距離可達約7.65公尺。第二款將反射背板放置電路板下方達成縮小天線尺寸，本天線亦可藉由反射板達到阻抗匹配，增益為1.9dBi，其最遠讀取距離約4.8公尺，第三款天線是以圓極化方式設計適用於手持式讀取器，本天線加入卍字型結構如同雙偶極有效延長共振路徑將體積進而縮小化，末端加入微擾元件使其整體阻抗趨近平緩而亦達成圓極化之輻射。其增益約為0.2dBi，最遠讀取距離約1.3公尺，以上所設計之天線是利用無反射實驗室量測與模擬軟體Ansoft HFSS彼此互相驗證來完成。

The main objective of this thesis presents the design of RFID reader antennas for handheld applications. Three different sizes of reader antenna are designed and operated at RFID band. The first reader antenna uses with reflector for impedance matching, which can reduce the size by increasing meander paths. This antenna achieves the reading distance approximately 7.65 m for EIRP 1W. The second antenna sets the reflector on background that achieve to reduce the size of antenna. It also adopts the reflector structure to match the impedance. The read distance can achieve approximately 4.8 m. Finally, the last one designed of Circularly Polarized for handheld applications which can reduce the size by adding structure of “卍”. The read distance can achieve approximately 1.3 m. Those reader antennas are measured in anechoic chamber and using Ansoft HFSS simulation software to verify the correction of the results.

摘 要 i
ABSTRACT ii
致 謝 iii
目 錄 iv
表 目 錄 v
圖 目 錄 vi
第一章 序論 1
1.1 研究背景 1
1.2 研究目的 3
1.3 文獻導覽 4
1.4 研究內容 5
第二章 應用於讀取器之線性極化天線設計 6
2.1 前言 6
2.2 天線原理與設計 6
2.3 天線實驗結果與討論 10
2.4 結論 20
第三章 縮小化讀取器之線性極化天線設計 21
3.1 前言 21
3.2 天線原理與設計 21
3.3 天線實驗結果與討論 25
3.4 結論 35
第四章 應用於讀取器之圓極化天線設計 36
4.1 前言 36
4.2 天線原理與設計 36
4.3 天線實驗結果與討論 38
4.4 結論 52
第五章 結論與未來發展 53
參考文獻 55

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