臺灣博碩士論文加值系統

近年來，無線通訊的應用已十分普遍，其中天線為其信號傳送之耳目，是研究發展工作上的重點。天線的種類很多，目前碎形天線的設計與應用快速的發展與成長。基本上，碎形天線自我相似的設計展現了具有頻率獨立的特性，在應用上，碎形結構的發展在於多重頻帶的使用，又由於碎形天線在天線大小的小型化、天線增益、寬頻與多重頻帶的特性，可獲得低成本，高增益，是一項極有潛力的工作。
碎形天線的研究，在基本結構上的應用有線形、三角形、方形、圓形、六邊形等，其中六邊形結構比較少被運用，所以本文以碎形自我相似的特性設計出三種六邊形碎形貼片天線。本文中我們將介紹三種遞迴結構，角由內向外遞迴、邊由外向內遞迴、角由外向內遞迴。之後，改變接地面相對於貼片的角度、厚度、介電常數等以分別討論天線的頻率響應和輻射場型。總之，當角由外向內遞迴接地面向右轉45角度，厚度1.6mm，介電常數4.4，頻率3.62GHz之頻寬為14.08％，增益為4.59dBi，另外頻率範圍在5.02至7.58GHz頻寬可達到49.23％，是一個較為理想的設計。

Recently, wireless communication application has been well-developed. In which the antenna is the key component of the transmission. The antenna has various structures. There has been a rapidly development and growing interest in fractal antennas design and application. Basically, it exhibits a frequency independent antenna after a self-similar design. In practice, specific fractal configuration with great benefit in product multiband characteristic has been developed. Its properties included which miniaturization in size, wideband and multiband, low cost and high gain. It is a valuable work that for application.
For fractal antennas, However, the hexagonal are the basic structures the line, the triangle, the square, the circular and hexagonal, structure utilization are quite few. Therefore, this thesis uses the self-similar the characteristic to design three kind of hexagonal fractal antenna. There are corner outward interation, side inward interation and corner inward interation. Mean which, changing ground plane angle, thickness and dielectric substrate separately to discuss frequency responses and radiation patterns. Finally, for corner inward interation, as the ground plane with on right, thickness is 1.6mm. and dielectric substrate is 4.4, the performance frequency in 3.62GHz / bandwidth（14%）, gain（4.59dBi）, the frequency among 5.02 to 7.58GHz / bandwidth（49.23%）, is obtain for application.

中文摘要………………………………………………………………………………… i
英文摘要………………………………………………………………………………… ii
誌謝……………………………………………………………………………………… iii
目錄……………………………………………………………………………………… iv
表目錄…………………………………………………………………………………… vi
圖目錄…………………………………………………………………………………… vii
第一章 緒論 …………………………………………………………………………… 1
1.1 背景回顧 ………………………………………………………………… 1
1.2 研究動機 ………………………………………………………………… 4
1.3 論文架構 ………………………………………………………………… 4
第二章 基本碎形貼片原理 …………………………………………………………… 5
2.1 碎形簡介 ………………………………………………………………… 5
2.2 碎形結構 ………………………………………………………………… 6
2.3 碎形維度 ………………………………………………………………… 11
2.4. 碎形微帶天線之特性 …………………………………………………… 16
2.4.1 微帶天線簡介 ……………………………………………………… 16
2.4.2 碎形天線 …………………………………………………………… 18
2.4.3 基本碎形貼片天線 ………………………………………………… 23
第三章 六邊形碎形貼片天線之設計 ………………………………………………… 25
3.1 六邊形碎形結構遞迴方式與設計實例…………………………………… 25
3.2 接地面之影響……………………………………………………………… 31
3.3介質基底層之影響 ………………………………………………………… 32
3.4 饋入方式與與饋入點位置………………………………………………… 32
第四章 模擬與分析 …………………………………………………………………… 34
4.1 頻率響應…………………………………………………………………… 34
4.1.1 實面六邊形結構 …………………………………………………… 34
4.1.2 實例一………………………………………………………………… 36
4.1.3 實例二………………………………………………………………… 40
4.1.4 實例三………………………………………………………………… 44
4.1.5 接地面之角度………………………………………………………… 48
4.1.6 介電基底層之厚度…………………………………………………… 53
4.1.7 介電基底層之電質…………………………………………………… 53
4.1.8 不同饋入點位置……………………………………………………… 53
4.2 輻射場型圖………………………………………………………………… 57
4.2.1 實例一………………………………………………………………… 57
4.2.1 實例二………………………………………………………………… 58
4.2.2 實例三………………………………………………………………… 60
4.2.3 接地面之角度………………………………………………………… 62
4.2.4 介電基底層之厚度…………………………………………………… 67
4.2.5 介電基底層之介電質………………………………………………… 69
第五章 結論 …………………………………………………………………………… 72
參考文獻………………………………………………………………………………… 75
附錄……………………………………………………………………………………… 78
簡歷……………………………………………………………………………………… 79

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