本論文是針對微帶天線的新式寬頻設計做研究、分析與探討。文中內容包含有：集成電抗性負載、空氣介質、倒L形平板天線、接地金屬片蝕刻長狀槽孔及實際運用。首先，集成電抗性負載微帶天線寬頻帶操作之設計，其操作頻寬可增加約1.4倍以上的操作頻寬。接著，使用空氣介質設計高純度寬頻圓極化，2 dB軸比頻寬達38﹪，是一項優異的設計結果。其次，使用彎曲的倒L形金屬板及空氣介質設計完成頻率比由1.66到2.29的雙寬頻操作倒L形平板天線。再次，將接地金屬片蝕刻上長狀槽孔或狹縫，增加的操作頻寬亦可達兩倍以上，且又有縮小化及使天線增益增加的性能，是相當新穎的設計概念。最後，更成功的設計實際可以運用於無線通訊DCS的基地台天線。

Novel broadband designs of microstrip antennas have been proposed in this dissertation, including bandwidth enhancement using integrated reactive loading, broadband circularly polarized designs, broadband dual-frequency design, bandwidth enhancement using a slotted ground plane and practical applications. First, bandwidth enhancement of microstrip antennas using integrated reactive loading is proposed and experimentally studied. Results show that the proposed antennas can have an operating bandwidth more than 2.0 times that of a conventional one at a given operating frequency. Second, by selecting a thick air substrate, a wideband circularly polarized microstrip antenna with improved CP quality has been implemented. In addition to the improved CP quality obtained, a 2-dB axial-ratio bandwidth as large as about 38% is also achieved. Third, by bending a planar rectangular patch into an inverted L-shaped patch, a dual-frequency planar antenna has been obtained. Experimental results show that the proposed antenna has a tunable frequency ratio of about 1.66-2.29. Fourth, by embedding meandering slots or slits in the antenna’s ground plane, it is observed that the impedance bandwidth of the microstrip antenna is twice larger than the conventional one. The experimental results show that the resonant frequency is significantly lower, which can lead to a large antenna size reduction for a fixed frequency operation. In addition, enhanced antenna gain is also obtained. Finally, a shorted patch antenna suitable for applications in DCS (1710-1880 MHz) base station is presented.

文字目錄 i
圖形目錄 iii
表格目錄 vii

第一章 序論 (Introduction) 1
1.1 概述 1
1.2 文獻導覽……… 2
1.3 內容提要……… 3

第二章 集成電抗性負載寬頻之設計(Bandwidth Enhancement of Microstrip Antennas Using Integrated Reactive Loading) 5
2.1 概述 5
2.2 設計概念 5
2.3 設計結果 6
2.4 分析與討論 7

第三章 空氣介質圓極化微帶天線之寬頻設計(Broadband Circularly Polarized Microstrip Antenna Designs) 14
3.1 概述 14
3.2 設計概念 14
3.3 使用Power divider 0°, 90°的設計方法 24
3.4 使用Power divider 0°, 180°的設計方法 31
3.5 使用Power divider 0°, 90°, 180°及270°的設計方法 37
3.6 設計結果 48
3.7 分析與討論 49
第四章 雙寬頻平板天線之設計(Broadband Dual-Frequency Microstrip Antenna Designs) 52
4.1 概述 52
4.2 設計概念 60
4.3 倒L形平板天線使用狹縫的設計方法.. 63
4.4 倒L形平板天線使用漸近增寬的設計方法 65
4.5 設計結果 67
4.6 分析與討論 79

第五章 接地金屬片蝕刻長狀槽孔之設計(Design of Microstrip Antennas with a Slotted Ground Plane) 82
5.1 概述 82
5.2 設計概念 82
5.3 實驗量測結果 86
5.4 分析與討論 91

第六章 微帶天線實際運用之設計 (Microstrip Antenna Designs for Practical Applications) 93
6.1 概述 93
6.2 設計概念 94
6.3 DCS基地臺天線之設計 94
6.4 設計結果 99
6.5 分析與討論 99

第七章 結論 (Conclusions) 100

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