Design and Characteristics Analysis of Multi-Band Antenna for Mobile Handset 林聖翔、吳俊德;林漢年
E-mail: 9706769@mail.dyu.edu.tw
ABSTRACT
This thesis is aimed at designing an embedded planar inverted-F antenna (PIFA) and monopole antenna that can be applied to mobile phones. Three embedded antennas applicable to multiple-band mobile phones were designed and fabricated. The planar inverted-F antenna and monopole antenna adopt the resonant condition of a quarter-wavelength line. The design of PIFA makes use of existing copper foil, aluminum foil, and base plate FR4. The advantages of this antenna are low cost, small size, light, easy to manufacture, and of low profile. The monopole antenna has a simple structure, wide impedance bandwidth and good properties of omni-directional radiation pattern at the horizontal plane. In this paper, three antennas were designed in accordance with the specified requirements of multi-band and multimode. Two different concepts were employed in the design of two planar inverted-F antennas. First, a parasitic resonance conductor was placed near the antenna to invoke parasitic resonance so as to increase the impedance bandwidth. Second, a folded antenna has been applied to reduce the antenna size and at the same time utilized the parasitic capacitance and inductance of the folded structure to lower the resonant frequency. The design of monopole antenna produced multi-band resonance via different branch of the monopole antenna. In order to design low frequency, one branch of the monopole antenna was meandered without increasing the volume. Finally, the distance between the antenna and ground was changed to control the impedance bandwidth at high frequency. The simulated and measured results of the embedded planar inverted-F antenna and the monopole antenna are analyzed and compared.
Keywords : Planar Inverted-F Antenna ; Folded antenna ; Branch of monopole antenna Table of Contents
封面內頁 簽名頁 授權書．．．．．．．．．．．．．．．．．．．．．．．．． iii 中文摘要．．．．．．．．．．．．
．．．．．．．．．．．． iv 英文摘要．．．．．．．．．．．．．．．．．．．．．．．． v 誌謝．．．．．．．．．
．．．．．．．．．．．．．．．．． vi 目錄．．．．．．．．．．．．．．．．．．．．．．．．．． vii 圖目錄．．
．．．．．．．．．．．．．．．．．．．．．．． x 表目錄．．．．．．．．．．．．．．．．．．．．．．．．． xv 第一章 緒論．．．．．．．．．．．．．．．．．．．．．． 1 1.1 前言．．．．．．．．．．．．．．．．．．．． 1 1.2 研究動機及方法．．．．．．．．．．．．．．． 3 1.3 論文架構．．．．．．．．．．．．．．．．． 8 第二章 平 面倒F型天線的演進與基本理論．．．．．．．． 9 2.1平面倒F型天線．．．．．．．．．．．．．．．． 9 2.1.1 原理．
．．．．．．．．．．．．．．．．． 9 2.1.2倒L型天線．．．．．．．．．．．．． 9 2.1.3倒F型天線．．．．．．．．
．．．．． 11 2.1.4 平面倒F型天線．．．． ．．．．．．． 13 2.2平面倒F型天線等效電路模型．．．．．．．．． 17 2.3平面倒F型天線在行動通訊設備之設計與運用．． 19 2.3.1手機天線的設計與趨勢．．．．．．．．． 19 2.3.2沖壓天線 與銅箔天線之比較．．．．．．． 22 2.4饋入方式．．．．．．．．．．．．．．．．．． 25 2.4.1 同軸饋入．．．．．
． ．．．．．．．．． 25 2.4.2 微帶線饋入．．．．．．．．． ．．．．． 25 2.4.3 固定式天線與端子介面．．．． ．．
．．． 25 第三章 平面倒F型天線設計．．．．．．．．．．．．．．． 28 3.1平面倒F型天線設計．．．．．．．．．．
．．． 28 3.1.1 天線設計概念．．．．．．．．．．．．． 28 3.1.2天線設計．．．．．．．．．．．．．．． 28 3.1.3天 線模擬分析與實測結果之探討．．．．． 31 3.2平面倒F型天線加入寄生元件之設計．．．．．． 39 3.2.1天線設計概念．
．．．．．．．．．．． 39 3.2.2天線設計．．．．．．．．．．．．．．． 39 3.2.3 天線模擬分析與實測結果之探討．．
．．． 43 3.3摺疊式平面倒F型天線設計．．．．．．．．．． 53 3.3.1天線設計概念．．．．．．．．．．．．．． 53 3.3.2天線設計．．．．．．．．．．．．．．．． 53 3.3.3 天線模擬分析與實測結果之探討．．．．． 57 3.4結論．．．
．．．．．．．．．．．．．．．．．． 65 第四章 多頻段多模式單極天線設計．．．．．．．．．．．． 66 4.1單極天 線原理．．．． ．．．．．．．．．．．． 66 4.2多頻帶多模式單極天線之設計．．．．．．．．．． 70 4.2.1天線設計 概念．．．．．．．．．．．．． 70 4.2.2天線設計．．．．．．．．．．．．．．． 70 4.2.3 天線模擬分析與實測結果之 探討．．．．． 73 4.3 結論．．．．．．．．．．．．．．．．．．．． 92 第五章 結論．．．．．．．．．．．．．．
．．．．．．．． 93 參考文獻．．．．．．．．．．．．．．．．．．．．．．．． 94 REFERENCES
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