臺灣博碩士論文加值系統

摘要
本論文中分別提出一種應用於筆記型電腦與平板電腦之LTE/WWAN小型化、低姿態天線。所提的第一項天線應用於筆記型電腦中，其天線高度僅有8 mm，具有低姿態的特性；且其為一頻率可調式天線之設計，利用一主動式切換開關來調整天線的操作模態，以達成LTE/WWAN八頻操作之目標。第二項天線為應用於平板電腦之LTE/WWAN雙饋入天線，它包含一簡單輻射體的單極天線，與兩個分別控制低頻與高頻之饋入埠。其設計理念主要是利用在兩個饋入端各加上一個匹配電路來分別產生低頻與高頻的寬頻共振模態，並利用電路之特性來阻隔兩個饋入之間互擾的可能，藉此來完成天線多頻操作之目標，來涵蓋所需的低頻操作頻帶LTE700/GSM850/900的頻寬 (704 ~ 960 MHz)，及高頻操作頻帶GSM1800/1900/UMTS/LTE2300/2500的頻寬(1710 ~ 2690 MHz)。

ABSTRACT
In this thesis, two small-size LTE/WWAN antennas are proposed for laptop and tablet computer applications, respectively. The first proposed antenna is embedded in laptop computers and has a low-profile characteristic whose height has only 8 mm. An active switch chip is used to control the lower band of the antenna, and thereby the demanding LTE/WWAN operating bandwidths (704 ~ 960 MHz, 1710 ~ 2690 MHz) can be achieved. The second proposed antenna is applied to tablet computers, and it is composed of a monopole antenna and two feeds. The two feeds are used to excite the operating modes of the lower and higher bands, respectively. By adding a matching circuit to each feed, two wide bandwidths for the lower and higher bands can be achieved, and cover the required LTE/WWAN eight-band operating bandwidths.

文字目錄
文字目錄 iii
圖形目錄 iv
表格目錄 vi
第一章 序論 (Introduction) 1
1.1 研究動機 1
1.2 文獻導覽 3
1.3 章節提要 4
第二章 應用於筆記型電腦之LTE/WWAN低姿態可調式天線(Low-Profile Frequency Reconfigurable Antenna for LTE/WWAN Operations in the Laptop Computer) 6
2.1 前言 6
2.2 天線設計與原理說明 7
2.3 天線實驗與量測結果 10
2.4 心得與討論 29
第三章 應用於平板電腦之LTE/WWAN雙饋入天線(Dual-feed Antenna for LTE/WWAN Operations in the Laptop Computer) 30
3.1前言 30
3.2天線設計與原理說明 31
3.3天線實驗與量測結果 44
3.4 心得與討論 53
第四章 結論 (Conclusions) 54
參考文獻 (References) 56
圖形目錄
圖1-1 八頻LTE/WWAN通訊系統之操作頻帶示意圖。 2
圖1-2 窄邊框大銀幕設計示意圖。 2
圖2-1 應用於筆記型電腦之低姿態可調式天線結構圖與整體配置圖。 8
圖2-2 本項天線細部結構圖。 9
圖2-3 本項天線實作成品照片。 10
圖2-4 本項天線於各個操作模式下返回損失的量測與模擬結果。
(a)Mode 1； (b)Mode 2； (c)Mode 3； (d)Mode 4。 11
圖2-5 本天線設計及參考天線的模擬返回損失結果(Mode 1)。 14
圖2-6 本天線設計及參考天線的模擬輸入阻抗結果(Mode 1)。
(a)輸入電阻； (b)輸入電抗。。 15
圖2-7 改變寄生短路金屬片的長度S1之模擬返回損失結果(Mode 1)。 16
圖2-8 改變寄生短路金屬片的長度S1之模擬輸入阻抗結果(Mode 1)。
(a)低頻帶；(b)高頻帶。 17
圖2-9 改變寄生短路金屬片的長度S2之模擬返回損失結果(Mode 1)。 18
圖2-10 寄生短路金屬片的長度S2之模擬返回損失結果(Mode 1)。
(a)輸入電阻；(b)輸入電抗。 18
圖2-11 本項天線模擬表面電流圖。
(a)Mode 1 (725 MHz)； (b)Mode 2 (766 MHz)； (c)Mode 3 (859 MHz)； (d)Mode 4 (920 MHz)； (e)Mode 1 (2000 MHz)。 20
圖2-12 本項天線的量測天線效率。(a)低頻帶；(b)高頻帶。 22
圖2-13 本項天線的量測天線增益。(a)低頻帶；(b)高頻帶。 23
圖2-14 三維輻射場型(量測值)。 24
圖2-15 本項天線於頻率716 MHz之模擬二維輻射場型圖。 25
圖2-16 本項天線於頻率766 MHz之模擬二維輻射場型圖。 26
圖2-17 本項天線於頻率860 MHz之模擬二維輻射場型圖。 26
圖2-18 本項天線於頻率925 MHz之模擬二維輻射場型圖。 27
圖2-19 本項天線於頻率1930 MHz之模擬二維輻射場型圖。 27
圖2-20 本項天線於頻率2500 MHz之模擬二維輻射場型圖。 28
圖3-1 天線結構圖及整體配置圖。 32
圖3-2 天線等效匹配電路示意圖。 33
圖3-3 Ant 1之模擬S參數與輸入阻抗。 35
圖3-4 Ant 2之模擬S參數與輸入阻抗。 35
圖3-5 阻抗轉換及諧振法。 36
圖3-6 常見阻抗匹配電路。 38
圖3-7 L型匹配電路。 38
圖3-8 π型匹配電路。 39
圖3-9 本項天線匹配電路元件示意圖。 41
圖3-10 天線匹配電路的計算值與修正值之模擬輸入阻抗圖。
(a)低頻帶；(b)高頻帶。 42
圖3-11 天線匹配電路的計算值與修正值之模擬S參數圖。 43
圖3-12 本項雙饋入天線之實體照片圖。 44
圖3-13 本天線之S參數量測數據與模擬結果。 45
圖3-14 Ant 3與所提出天線的模擬結果。(a) 輸入阻抗；(b) S參數。 46
圖3-15 Ant 4與所提出天線的模擬結果。(a) 輸入阻抗；(b) S參數。 47
圖3-16 本項天線的量測效率。(a)低頻帶；(b)高頻帶。 49
圖3-17 本項天線的量測增益。(a)低頻帶；(b)高頻帶。 50
圖3-18 本項天線於頻率900 MHz之模擬遠場二維輻射場型圖。 51
圖3-19 本項天線於頻率1800 MHz之模擬遠場二維輻射場型圖。 51
圖3-20 本項天線於頻率2600 MHz之模擬遠場二維輻射場型圖。 52
表格目錄
表3-1 port 1匹配電路計算元件電抗值。 40
表3-2 port 2匹配電路計算元件電抗值。 40
表3-3 匹配電路之計算值與修正元件值。 41

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