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姓名 江明鴻(Ming-Hung Chiang) 查詢紙本館藏 畢業系所 電機工程學系 論文名稱 雙頻段對數週期天線陣列之改良與設計
(Design of Dual-Band Modified Log-Periodic Dipole Antenna (LPDA) Array)相關論文 檔案 [Endnote RIS 格式]
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摘要(中) 本論文目標為設計與探討一個雙頻段、單一指向且高方向性之天線。天線主要架構是採用具有單一指向且高方向性的對數週期天線 (Log-Periodic Dipole Antenna,LPDA) 與八木天線 (Yagi-Uda) 做為選擇。偶極天線單元採用PS (Parallel Strip)進行各天線單元之串聯,將PS之特徵阻抗設定為50 Ω進行饋入。本文對數週期天線設計上不採用交叉饋入的方式進行天線之設計,由於傳統印刷式對數週期天線由短邊偶極天線單元處饋入,而利用改良天線架構之方式可以做到將訊號由長邊偶極天線單元處饋入之方法,再以八木天線串聯進行模擬與設計。
本論文天線設計於FR4之板材,在頻段規格上操作於2.4 – 2.484 GHz與3.3 – 5 GHz之雙頻段設計,而低頻段由八木天線建構,頻寬量測結果為2.39 – 2.66 GHz (11%)頻段,高頻段由改良式對數週期天線建構,頻寬量測結果為2.94 – 5.07 GHz (51.3%)頻段,在頻率2.45 GHz、3.5 GHz、4 GHz與4.5 GHz頻率點上之輻射場型前後比皆達15 dBi以上,使用全波模擬軟體為HFSS,電路模擬軟體為ADS。
摘要(英) Design of dual band uni-direction and high directivity antenna is presented in the thesis. The proposed antenna is consist of the uni-direction high directivity log-periodic dipole array (LPDA) and Yagi antenna. Both are constructed with series dipole elements by PS (parallel strip), and then the 50 Ω parallel strip as the antenna feed. The proposed LPDA antenna element dose not be adopt by cross feed. The traditional printed log periodic dipole antenna array is fed on the shortest dipole position. The proposed LPDA antenna, on the other hand, can be fed on the longest dipole positon by modified antenna arrangement. Then it is connected with Yagi antenna.
The presented antenna is designed with the dielectric substrate of FR4. The formulated frequency band is operated from 2.4 GHz to 2.484 GHz and 3.3 GHz to 5 GHz for dual band applications. The proposed antenna is constructed with the Yagi and the modified log-periodic dipole antenna. The bandwidth is measured from 2.39 GHz to 2.66 GHz in the low band and 2.94 GHz to 5.07 GHz in the high band. The front to back ratio upon to 15 dB at 2.45 GHz、3.5 GHz、4 GHz, and 4.5 GHz. The full-wave simulation software and circuit simulation software are HFSS and ADS, respectively.
關鍵字(中) ★ 雙頻
★ 對數週期天線
★ 天線陣列關鍵字(英) 論文目次 摘要 I
Abstract II
致謝 III
目錄 IV
圖目錄 VI
表目錄 IX
第一章 緒論 1
1-1 前言 1
1-2 研究動機與目的 2
1-3 文獻回顧 3
1-4 章節介紹 5
第二章 天線基礎理論 6
2-1 偶極天線介紹 6
2-2 八木天線介紹 10
2-3 線性天線陣列介紹 14
2-4 對數週期天線介紹 18
2-4-1 對數週期天線參數介紹 18
2-4-2 對數週期天線設計方法 23
第三章 各頻段天線架構設計 26
3-1 低頻段2.4 – 2.484 GHz天線架構 26
3-1-1 設計2.4 – 2.484 GHz對數週期天線 26
3-1-2 設計中心頻率為2.45 GHz八木天線 31
3-1-3 探討低頻段之天線結構 34
3-2 高頻段3.3 – 5 GHz 天線架構 35
3-2-1 設計3.3 – 5 GHz對數週期天線 35
3-2-2 設計中心頻率為4.15 GHz八木天線 41
3-2-3 探討高頻段之天線結構 44
3-3改良結構之印刷式對數週期天線 45
3-3-1 改良結構對數週期天線之構思 45
3-3-2改良結構之印刷式對數週期天線模擬設計 48
3-3-3 傳統式與改良結構之印刷式對數週期天線之電流相位分析 54
第四章 雙頻段天線設計 57
4-1 雙頻段天線模擬設計 57
4-1-1 全頻段2.4 – 5 GHz改良結構對數週期天線 57
4-1-2 雙頻段天線模擬設計分析 62
4-1-3 雙頻段天線模擬 68
4-2 雙頻段天線實作與量測 75
4-2-1 雙頻段天線實作 75
4-2-2 雙頻段天線模擬與量測比較 75
第五章 總結 81
參考文獻 82
參考文獻 [1] Qualcomm Technologies, Inc., “What can we do with 5G NR spectrum sharing that isn’t possible today,” Dec 2017. [Online]. Available: https://www.qualcomm.com/videos/webinar-what-can-we-do-5g-nr-spectrum-sharing-isnt-possible-today
[2] Syed S. Jehangir, Mohammad S. Sharawi and Atif Shamim, “Dual printed antenna for Wi-Fi applications,” IET Microw. Antennas Propag., vol. 12 Iss. 6, pp. 864-871, 2017.
[3] G. A. Casula, P. Maxia, G. Montisci, G. Mazzarella and F. Gaudiomonte, “A printed LPDA fed by a coplanar waveguide for broadband applications,” IEEE Antennas Wireless Propag. Lett., vol. 12, pp. 1232–1235, 2013.
[4] G. A. Casula, G. Montisci, P. Maxia, G. Valente, A. Fanti and G. Mazzarella, “A low cost dual band CPW-fed printed LPDA for wireless communications,”IEEE Antenna Wireless Propag. Lett., vol. 15, 2016.
[5] H.-C. Huang, J.-C. Lu and P. Hsu, “A compact dual-band printed yagi-uda antenna for GNSS and CMMB applications,” IEEE Trans. Antennas Propag., vol. 63, No. 5, May 2015.
[6] J. Chen, J. Ludwig and S. Lim, “Design of a compact log-periodic dipole array using T-shape top loadings,” IEEE Antennas Wireless Propag. Lett., vol. 16, 2017.
[7] R. Carrel, “The Design of the Log-Periodic Dipole Antenna,” IRE Int. Conventional Rec., 1961, vol. 9
[8] T. Limpiti, A. Y. Chantaveerod, “Design of a Printed Log-Periodic Dipole Antenna (LPDA) for 0.8-2.5 GHz Band Applications,” School of Engineering and Resources Walailak University, Nakon Si Thammarat, Thailand, Sierpien, 2016.
[9] E. Avila-Navarro, J. M. Blanes, J. A. Carrasco, J. Reig, and E. A. Navarro, “A New Bi-Faced Log Periodic Printed Antenna,” Microwave and Optical Technology Letters, vol. 48, no. 2, pp. 402-405, Feb. 2006.
[10] D. E. Anagnostou, J. Papapolymerou, M. M. Tentzeris, and C. G. Christodoulou, “A printed log-periodic Koch-dipole array (LPKDA),” IEEE Antennas Wireless Propag. Lett., vol. 7, pp. 456–460, 2008.
[11] N. A. Bishop, J. Miller, D. Zeppettella, W. Baron, J. Tuss and M. Ali, “A broadband high-gain bi-layer LPDA for UHF conformal load-bearing antenna structures (CLASs) applications,” IEEE Trans. Antennas Propag., vol. 63, No. 5, May 2015.
[12] http://cc.ee.ntu.edu.tw/~skjeng/ElectromagneticWaveBook/ch06.ppt
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