臺灣博碩士論文加值系統

本篇論文主要是在RFID頻段上(UHF band; 0.858GHz-0.96GHz)，探討堆疊槽孔環結構對貼片天線的影響，進而改善天線增益及圓形極化，並在加大堆疊槽孔環外圍尺寸時，對天線既有的特性的變化加以探討。
利用環型槽孔堆疊於貼片天線上，其此環型槽孔是蝕刻於FR-4上，兩結構之間以空氣為介質，其間隔的空氣層約0.1波長，藉此使堆疊的槽孔與貼片天線耦合產生具有寬頻圓形極化及高增益之特性。
在實際量測下的堆疊槽孔天線特性與電磁模擬軟體分析結果雷同，其特性如下：阻抗頻寬(小於10dB)為20.3%(0.84GHz-1.03GHz)，3dB的軸比頻寬8.7%(0.88GHz-0.96GHz)，而天線增益大於6dBic以上的頻寬亦有11.9% (0.87GHz-0.98GHz)，其涵蓋操作頻率範圍內的3dB的波束寬度均在 ±20°。

A method is proposed to enhance the Return-Loss and axial-ratio bandwidths for a probe-fed circularly polarized microstrip patch antenna. The patch is stacked by a slot-ring at a distance of 0.1λ in free space. By shifting the relative positions between the patch and the ring, 8.6% axial-ratio bandwidth can be achieved from 0.88GHz to 0.96GMHz, the gain is higher than 6dBic within this bandwidth.

致 謝 i
ABSTRACT ii
中文摘要 iii
目次 iv
圖目錄 vi
表目錄 viii
第一章 概論 1
1.1 概述 1
1.2 無線射頻辨識系統簡介 2
1.3 無線射頻辨識系統天線種類 4
1.4 無線射頻辨識系統天線頻段 7
1.5 研究動機 10
1.6 論文結構 11
第二章 天線理論 12
2.1 微帶天線概論 12
2.1.1 貼片天線理論 12
2.1.2 貼片天線饋入方式 13
2.2 基本圓極化方式與量測軸比的方法 14
第三章 貼片天線設計與分析 15
3.1 圓極化貼片天線設計 15
3.2堆疊槽孔環貼片天線 18
3.3堆疊槽孔環貼片天線與貼片天線之比較 22
3.4堆疊槽孔環金屬大小對貼片天線之影響 24
3.5堆疊槽孔環大小對貼片天線之影響 26
3.6模擬與量測數據 28
第四章 貼片天線應用討論與比較 35
第五章 結論 41

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