本論文主要是針對應用在行動手機的天線提出兩種創新設計，在第一種設計中，我們利用一螺旋金屬線當負載，使倒L形單極天線能夠產生兩個頻率約為900 MHz及1850 MHz的共振模態，且模態頻寬可包括GSM/DCS/PCS三操作頻段；另一種設計是結合一可激發低頻模態的倒F形天線及一可激發高頻模態的倒L形天線，模態頻寬可分別包括GSM與DCS/PCS三操作頻段，且天線體積僅為7.2 × 20 × 40 mm3，可輕易達到隱藏式天線的要求。

Two novel antenna designs for mobile handsets are proposed in this thesis. With a helix loading, an inverted-L monopole antenna capable of generating two resonances at about 900 and 1850 MHz is first presented. The operating bandwidths obtained cover the required bandwidths of the GSM/DCS/PCS bands. Besides, an internal mobile handset antenna comprising a PIFA and a PILA, which are, respectively, designed for covering the GSM and DCS/PCS bands is also presented. The PIFA and PILA together occupy a compact volume of 7.2 × 20 × 40 mm3, and are suitable to be built-in within the housing of a mobile handset.

文字目錄

文字目錄.....i
圖形目錄.....iii
表格目錄.....v

第一章 序論 (Introduction)....................................................1
1.1 概述......................................................................1
1.2 文獻導覽..................................................................2
1.3 論文提要..................................................................2

第二章 適用於多頻行動手機之具有螺旋線負載倒L形單極天線
(Inverted-L Monopole Antenna Loaded with a Helix for Multi-Band Mobile Handsets) .....................................................................4
2.1 天線設計..................................................................5
2.2 實驗結果與模擬分析........................................................7
2.3 場型變化與接地面長度的關係...............................................15
2.4 心得與討論...............................................................20

第三章 應用在GSM/DCS/PCS頻帶之倒F形及倒L形結合式天線
(PIFA-PILA Mobile Handset Antenna for GSM/DCS/PCS Bands).....................21
3.1 天線設計.................................................................22
3.2 實驗結果與模擬分析.......................................................25
3.4 心得與討論...............................................................26
第四章 結論 (Conclusions)....................................................34

參考文獻 (References)........................................................35
論文著作表 (Publication List)................................................38


圖形目錄

圖2.1 一具有螺旋線負載之倒L形單極天線的結構圖。(a)天線正視圖；(b)天線側視圖。..........................................................................9
圖2.2 天線實驗量測與模擬的返回損失圖。(a)單獨倒L形天線實驗量測與模擬的返回損失圖；(b)具有螺旋線負載之倒L形單極天線實驗量測與模擬的返回損失圖。.............10
圖2.3 天線於900 MHz量測的遠場輻射場型。......................................11
圖2.4 天線於1800 MHz量測的遠場輻射場型。.....................................12
圖2.5 天線於1900 MHz量測的遠場輻射場型。.....................................13
圖2.6 天線量測增益圖。(a)GSM頻段量測增益圖；(b)DCS/PCS頻段量測增益圖。.......14
圖2.7 模擬倒L形天線在接地面長度(L)不同時的電流密度分佈圖，f = 1800 MHz。(a) L = 40 mm；(b) L = 80 mm；(c) L = 120 mm；(d) L = 160 mm；(e) L = 200 mm。.....17
圖2.8 模擬倒L形天線在接地面長度(L)不同時的輻射場型，f = 1800 MHz。(a) L = 40 mm；(b) L = 80 mm；(c) L = 120 mm。..........................................18
圖2.9 模擬倒L形天線在接地面長度(L)不同時的輻射場型，f = 1800 MHz。(a) L = 160 mm；(b) L = 200 mm。.........................................................19

圖3.1 應用在GSM/DCS/PCS頻帶之倒F形及倒L形結合式天線結構圖。(a)天線立體圖；(b)天線展開圖。...................................................................24
圖3.2 天線實驗量測與模擬的返回損失圖。(a)單獨倒F形天線實驗量測與模擬的返回損失圖；(b)倒F形及倒L形結合式天線實驗量測與模擬的返回損失圖。....................27
圖3.3 天線於900 MHz模擬的電流密度分佈圖。(a)天線輻射金屬片模擬的電流密度分佈圖；(b)天線接地面模擬的電流密度分佈圖。......................................28
圖3.4 天線於1850 MHz模擬的電流密度分佈圖。(a)天線輻射金屬片模擬的電流密度分佈圖；(b)天線接地面模擬的電流密度分佈圖。......................................29
圖3.5 天線於900 MHz量測的遠場輻射場型。......................................30
圖3.6 天線於1800 MHz量測的遠場輻射場型。.....................................31
圖3.7 天線於1900 MHz量測的遠場輻射場型。.....................................32
圖3.8 天線量測增益圖。(a)GSM頻段量測增益圖；(b)DCS/PCS頻段量測增益圖。.......33


表格目錄

表2.1 量測不同螺旋間距(S)的天線特性。天線的其他尺寸標示在圖2.1中。阻抗頻寬由2.5：1 VSWR或7.3 dB返回損失定義。.............................................7
表2.2 不同接地面長度的倒L形單極天線輻射場型變化表。天線的其他尺寸標示在圖2.1中。.........................................................................20

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