天線工程 Mimo Antenna 姓名:黃昱銘 學號:M98S0209 授課教授:陳文山
大綱 筆電簡介 MIMO 天線介紹 MIMO 論文探討 參考文獻
UWB WWAN Aux WiFi/WiMAX Aux 筆記型電腦 WWAN Main WiFi/WiMAX Main Camera UWB WWAN Aux WiFi/WiMAX Aux NB 發展趨勢 體積更小更輕 多媒體功能更完善 處理速度更快 每人每天生活的必需品 可在任何地方、時間上網 WiFi MIMO DTV WiMAX/WiFi MIMO FM Connectors Keyboard MIMO DTV WWAN - GSM/GPRS/WCDMA - AGPS - LTE Other Communication - GPS - DTV - FM WPAN - Bluetooth - UWB GPS WLAN - WiFi(802.11 a/b/g) - MIMO(802.11n) WMAN - WiMax - 802.16 BT 此圖取自:連展科技股份有限公司 Advanced-Connectek Inc., Wireless Communications BU.
筆電天線種類 赫茲半波長天線(Hertz Ian dipole) 。 馬可尼四分之一波長垂直天線(Marconi antenna) 。 陣列天線(antenna array) 。 折式天線(Folded antenna) 。 多輸入輸出式天線(Mimo antenna)。
大綱 筆電簡介 MIMO 天線介紹 MIMO 論文探討 參考文獻
MIMO天線介紹(1/4) MIMO 全寫為「Multi-input Multi-output」,即是「多重輸入輸出」。 多支發射天線與多支接收天線。 傳輸速率快,比傳統的無線傳輸高出兩倍或更多倍。 可支援 MIMO 技術的Draft-N 2.0 制式的無線網絡產品。 MIMO 是一種在一個無線電通道內傳輸和接收兩個或多個不同數據串流的革命性多維傳輸方法,採用這種技術,系統在每個訊息通道內傳送的數據率將能提高兩倍或更多倍。 MIMO的核心概念為利用多支發射天線與多支接收天線所提供之空間自由度來有效提升無線通訊系統之頻譜效率,以提升傳輸速率並改善通訊品質。
MIMO天線介紹(2/4) 傳統基地台在802.11g傳輸模式下,天線一次送出的資料是54M,而2隻天線的機種也只是2隻天線同時送同一組訊號,所以也就只有54M; 但MIMO是同時送1組訊號並把資料1切為2,用2隻天線同時送出,像高架橋一樣,分上下2層,所以可以傳出2倍的資料,也就是一個頻道重覆用2次,變成108M。 此圖截取自:(電子工程輯:http://www.eettaiwan.com/ART_8800437322_617723_TA_765ed038.HTM)
MIMO天線介紹(3/4) 此圖截取自:(電子工程輯:http://www.eettaiwan.com/ART_8800437322_617723_TA_765ed038.HTM)
MIMO天線介紹(4/4) 隔離度 使用MIMO 天線系統是為了解決天線多重路徑衰減的問題,但由於無線產品的為了輕巧易於攜帶,所以體積來也愈來愈小,使得天線與天線過於接近,造成天線之間的隔離度(Isolation)降低,使得基頻信號處理困難、傳輸速度變低,也會造天線之間的破壞性的干涉使得增益降 以一支3天線的 MIMO天線會有S11 、S22 、 S33這三種輸出,而S12 、 S13 、 S23即為此天線隔離度之代號
大綱 筆電簡介 MIMO 天線介紹 MIMO 論文探討 參考文獻
MIMO 論文探討 A THREE-IN-ONE DIVERSITY ANTENNA SYSTEM FOR 5 GHZ WLAN APPLICATIONS Design of a Multiband Internal Antenna for Mobile Application Design of MIMO Antennas with Strong Isolation for Portable Applications Multiband MIMO Antenna with a Band Stop Filter for High Isolation haracteristics
1. A THREE-IN-ONE DIVERSITY ANTENNA SYSTEM FOR 5 GHZ WLAN APPLICATIONS (1/3) 圖一 : 所示為本文所提出之平面 MIMO 天線幾何結構圖,天線整體尺寸為30 × 27 mm2 本論文所提出之用挖狹槽方式來,電流增加電流過的路徑長度來增加天線與天線隔離度 此圖取自 :Saou-Wen Su , ” A THREE-IN-ONE DIVERSITY ANTENNA SYSTEM FOR 5 GHZ WLAN APPLICATIONS”, MICROWAVE AND OPTICAL TECHNOLOGY LETTERS / Vol. 51, No. 10, October 2009
1. A THREE-IN-ONE DIVERSITY ANTENNA SYSTEM FOR 5 GHZ WLAN APPLICATIONS (2/3) 本天線設計之隔離度規格訂為 -20 dB,其用意是因為本MIMO 天線有 3 埠,將作為發射 / 接收用,因此期望各埠不會彼此受到干擾。 多埠 MIMO 天線應用於 WLAN 除 Return Loss 需求外,在隔離度方面相較於一般天線亦有不同之要求,本天線設計之隔離度規格訂為 -20 dB,其用意是因為本MIMO 天線有 3 埠,將作為發射 / 接收用,因此期望各 埠不會彼此受到干擾 此圖取自 :Saou-Wen Su , ” A THREE-IN-ONE DIVERSITY ANTENNA SYSTEM FOR 5 GHZ WLAN APPLICATIONS”, MICROWAVE AND OPTICAL TECHNOLOGY LETTERS / Vol. 51, No. 10, October 2009
1. A THREE-IN-ONE DIVERSITY ANTENNA SYSTEM FOR 5 GHZ WLAN APPLICATIONS (3/3) 本文提出了平面式 MIMO 天線,可應用於WLAN之無線區域網路產品。 此圖取自 :Saou-Wen Su , ” A THREE-IN-ONE DIVERSITY ANTENNA SYSTEM FOR 5 GHZ WLAN APPLICATIONS”, MICROWAVE AND OPTICAL TECHNOLOGY LETTERS / Vol. 51, No. 10, October 2009
MIMO 論文探討 A THREE-IN-ONE DIVERSITY ANTENNA SYSTEM FOR 5 GHZ WLAN APPLICATIONS Design of a Multiband Internal Antenna for Mobile Application Design of MIMO Antennas with Strong Isolation for Portable Applications Multiband MIMO Antenna with a Band Stop Filter for High Isolation haracteristics
2. Design of a Multiband Internal Antenna for Mobile Application (1/3) 兩天線間使用stubs增強Isolation 此圖取自: Haeil Chung, Yohan lang and laehoon Choi# “Design of a Multiband Internal Antenna for Mobile Application”IEEE , APS.2009.5172048 pp.1 - 4 Digital Object Identifier 10.11.09
2. Design of a Multiband Internal Antenna for Mobile Application (2/3) stubs擺設位置和形狀尺寸是很重要的因為它會影響接地面積 由上頁的圖可知加了stubs可有效改善隔離度 當兩天線結構被激發後 此圖取自: Haeil Chung, Yohan lang and laehoon Choi# “Design of a Multiband Internal Antenna for Mobile Application”IEEE , APS.2009.5172048 pp.1 - 4 Digital Object Identifier 10.11.09
2. Design of a Multiband Internal Antenna for Mobile Application (3/3) 結果所示此MIMO天線滿足: WiBro/WLAN/Mobile-WiMAX 並滿足寬頻分碼多工 (WCDMA) 此圖取自: Haeil Chung, Yohan lang and laehoon Choi# “Design of a Multiband Internal Antenna for Mobile Application”IEEE , APS.2009.5172048 pp.1 - 4 Digital Object Identifier 10.11.09
MIMO 論文探討 A THREE-IN-ONE DIVERSITY ANTENNA SYSTEM FOR 5 GHZ WLAN APPLICATIONS Design of a Multiband Internal Antenna for Mobile Application Design of MIMO Antennas with Strong Isolation for Portable Applications Multiband MIMO Antenna with a Band Stop Filter for High Isolation haracteristics
3. Design of MIMO Antennas with Strong Isolation for Portable Applications (1/3) 在兩天線間加入Metmaterials可有效提高隔離度而且可以有效縮減兩天線的間距。 此圖取自: Chih-Chun Hsu*(l), Ken-Huang Lin(l), Hsin-Lung Su(2), Hung-Hsuan Lin(3), and Chin-Yih WU(3)” Design of MIMO Antennas with Strong Isolation for Portable Applications” 2009 IEEE
3. Design of MIMO Antennas with Strong Isolation for Portable Applications (2/3) metamaterials 是一種特別設計再從新組合的人工結構電磁式物體,是種在自然界裡找不到的新產品。 此圖取自: Chih-Chun Hsu*(l), Ken-Huang Lin(l), Hsin-Lung Su(2), Hung-Hsuan Lin(3), and Chin-Yih WU(3)” Design of MIMO Antennas with Strong Isolation for Portable Applications” 2009 IEEE
3. Design of MIMO Antennas with Strong Isolation for Portable Applications (3/3) WiMAX 2.6GHz 此圖取自: Chih-Chun Hsu*(l), Ken-Huang Lin(l), Hsin-Lung Su(2), Hung-Hsuan Lin(3), and Chin-Yih WU(3)” Design of MIMO Antennas with Strong Isolation for Portable Applications” 2009 IEEE
MIMO 論文探討 A THREE-IN-ONE DIVERSITY ANTENNA SYSTEM FOR 5 GHZ WLAN APPLICATIONS Design of a Multiband Internal Antenna for Mobile Application Design of MIMO Antennas with Strong Isolation for Portable Applications Multiband MIMO Antenna with a Band Stop Filter for High Isolation haracteristics
4. Multiband MIMO Antenna with a Band Stop Filter for High Isolation Characteristics (1/3) 此圖取自: Min-Seok Han and Jaehoon Choi“Multiband MIMO Antenna with a Band Stop Filter for High Isolation Characteristics” APS.2009.5171820 June 2009 pp:1 - 4
4. Multiband MIMO Antenna with a Band Stop Filter for High Isolation Characteristics (2/3) 高頻濾波電路都以電抗性元件,如電感或電容等組合而成。 加入此方法可以提高隔離度,且符合多種規格需求,除了LTE band 之外還有WCDMA/ HSDPA/ M-WiMAX band。 平行耦合線結合可調開路殘段的帶拒濾波器此耦合線結構具有較小面積及較寬頻寬的帶拒濾波器 帶拒濾波器結構圖 此圖取自: Min-Seok Han and Jaehoon Choi“Multiband MIMO Antenna with a Band Stop Filter for High Isolation Characteristics” APS.2009.5171820 June 2009 pp:1 - 4
4. Multiband MIMO Antenna with a Band Stop Filter for High Isolation Characteristics (3/3) 此圖取自: Min-Seok Han and Jaehoon Choi“Multiband MIMO Antenna with a Band Stop Filter for High Isolation Characteristics” APS.2009.5171820 June 2009 pp:1 - 4
Q&A Q:激發點位置對mimo天線是否有影響 A:有,改變天線上之饋入位置,可控制輸入阻抗值,使天線有機會達到良好阻抗匹配。
參考文獻 [1] Saou-Wen Su , ” A THREE-IN-ONE DIVERSITY ANTENNA SYSTEM FOR 5 GHZ WLAN APPLICATIONS”, MICROWAVE AND OPTICAL TECHNOLOGY LETTERS / Vol. 51, No. 10, October 2009 [2] Haeil Chung, Yohan lang and laehoon Choi# “Design of a Multiband Internal Antenna for Mobile Application”IEEE , APS.2009.5172048 pp.1 - 4 Digital Object Identifier 10.11.09 [3] Chih-Chun Hsu*(l), Ken-Huang Lin(l), Hsin-Lung Su(2), Hung-Hsuan Lin(3), and Chin-Yih WU(3)” Design of MIMO Antennas with Strong Isolation for Portable Applications” 2009 IEEE [4] Min-Seok Han and Jaehoon Choi” Multiband MIMO Antenna with a Band Stop Filter for High Isolation Characteristics” , APS. June 2009 pp.1- 4 ,10.11.09/ [5] 周錫增、段世中 、董嘉、鄭皓中 ”應用於無線區域網路之一MIMO 天線間電波隔離設計”
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