臺灣博碩士論文加值系統

本論文提出雙頻雙十字槽孔微帶型天線，利用微帶線饋入及挖槽的方式設計，透過微帶線饋入的方式提升阻抗匹配，且導入雙十字槽孔結構可製造5GHz諧振頻率，增加短路截面填補槽孔轉折處，增加短路截線填補各段槽孔中心處，兩者皆可改變電流路徑，改變槽孔兩側電流由反向電流轉為同向電流，達到天線輻射增益提升。雙頻雙十字槽孔微帶型平板天線是使用2.45GHz的四分之一波長之長度進行設計，應用於WLAN 2.45GHz/5GHz之具有指向性的雙頻天線，總體積尺寸為63mm x 72mm x 7.6mm。雙頻雙十字槽孔微帶型平板天線可應用於無線路由器，具指向性特性的設計，使能量更集中傳輸距離更遠，其天線設計更能貼近無線通訊產品的應用。

In the thesis, we present Dual-Band Microstrip Patch Antenna with a Double Cross-Slot employed Microstrip line feeding as well as slot design to enhance impedance matching and Cross-Slot to increase 5GHz resonance frequency.We use short area to fill the turning point of slots or short line to the centers of slots in order to enhance current paths. Simultaneously, aforesaid methods can change current at both sides of slot from reverse to the same direction so as to achieve antenna radiation gain.Dual-Band Microstrip Patch Antenna with a Double Cross-Slot is designed by one forth bandwidth of 2.45GHz to apply to WLAN 2.45GHz/5GHz dual-band directive antenna. In regard to antenna structure,Its dimension is 63mm x 72mm x 7.6mm,Dual-Band Microstrip Patch Antenna with a Double Cross-Slot design possesses the strength of power centralization and long distance transmission, which antenna design is more suitable for WLAN product application, e.g. wireless routers.

摘　要 I
ABSTRACT II
誌 謝 III
目 錄 IV
表目錄 VI
圖目錄 VII
第一章 緒論 1
1.1 研究背景與動機 1
1.2 常用的商用頻段規格 2
1.3 內容大綱 3
第二章 天線設計之相關基本原理與特性 4
2.1 微帶天線（MICROSTRIP PATCH ANTENNAS） 4
2.1.1 基本特性（Basic characteristics） 4
2.1.2 饋入方法 (Feeding methods) 5
2.1.3 微帶天線基本模態 8
2.1.4 矩形微帶天線設計公式 10
2.2 槽孔輻射原理 12
2.3 天線的增益 14
2.4 天線的指向性 18
第三章 天線架構與設計概念 20
3.1 原始微帶型平板天線架構 20
3.2 微帶線對平板天線之影響 21
3.3 槽孔對微帶型平板天線之影響 23
3.4 實作與量測 28
第四章 雙頻雙十字槽孔微帶型平板天線 31
4.1 雙頻雙十字槽孔微帶型平板天線結構 31
4.2 短路截面對天線之參數分析 33
4.3 短路截線對天線之參數分析 36
4.4 實作與驗證 39
第五章 結論 43
參考文獻 44

[1] 林懷鈺，UHF收發天線於金屬環境中之最佳化設計，景文科技大學電腦與通訊研究所碩士學位論文，2012年
[2] W. L. Stutzman and G. A. Thiele, “Antenna Theory and Design”, John Wiley, New York, 1998, Sec. 5.8.
[3] D. R. Jackson and N. G. Alexopoulos,“Simple approximate formulas for input resistance, bandwidth, and efficiency of a resonant rectangular patch”, IEEE Trans. Antennas Propagation,1991
[4] D. M. Pozar, “Microstrip antennas,” Proc. IEEE, Vol. 80, No. 1, pp. 79-81, January 1992.
[5] D. M. Pozar, “A microstrip antenna aperture coupled to a microstrip line,” Electronic Letters, Vol. 21, pp. 554-556, May 1986.
[6] D. H. Schaubert, D. M. Pozar, and A. Adrian, “Effect of microstrip antenna substrate thickness and permittivity: comparison of theories and experiment,” IEEE Trans. Antennas Propagation., Vol. AP-37, No. 6, pp. 677-682, June 1989.
[7] H. A. Bethe, “Theory of diffractions by small holes,” Phsical Review, Vol. 66. pp. 163-182, 1944.
[8] D. M. Pozar and B. Kaufman, “Increasing the bandwidth of a microstrip antenna by proximity coupling” Electric Letters, Vol. 23, pp. 368-369, April 1987.
[9] D. K. Cheng, Field and Wave Electromagnetics, 2nd Ed., Addison-Wesley Inc,1989.
[10] G. Kumar and K. P. Ray, Broadband Microstrip Antenna, MA: Artech House,Inc.,2003

[11] C. A. Balanis, Antenna Theory Analysis and Design, 2nd Ed., John Wiley &; Sons,Inc., 1997.
[12] P. L. Sullivan and D. H. Schaubert, “Analysis of an Aperture Coupled Microstrip Antenna,” IEEE Trans. on Antennas Propagat., Vol. 34, No. 8, Aug.1986, pp. 977-984.
[13] D. M. Pozar and S. D. Targonski, “Improved Coupling for Aperture Coupled Microstrip Antennas” , Electric Letters., Vol.27, No. 13, 20th June 1991, pp.1129-1131.
[14] 吳昌儒，雙極化領結型槽孔天線應用於寬頻無線通訊之研究，景文科技大學電腦與通訊研究所碩士學位論文，2010年
[15] J. D. Kraus and R. J. Marhefka, “Antennas: for All Applications” 3rd Edition, McGraw-Hill, 2003.
[16] Cun-Long Li, Hai-Hua Wang, Hao-Jia Lin, Xiao-Wei Shi, Wen-Tao Li and Le Xu, “Analysis and Design of Broadband Microstrip Patch Antenna with a Pair of Double Cross-shaped Slots”,IEEE ICMMT 2010 Proceedings,Page(s):18-21
[17] Hyuck Jin Kim, Sung Min Kim, Ji Myoung Son, Woon Geun Yang“Design and implementation of dual band circular polarization square patch antenna”, IEEE APMC 2005 Proceedings.
[18] Sung Min Kim, Ji Myoung Son, Hyuck Jin Kim, Woon Geun Yang“Design and implementation of dual-band square patch antenna for wireless LAN of 2.4GHz and 5.7GHz”, IEEE APMC2005 Proceedings.
[19] Jeen-Sheen Row , “Patch Antenna Fed by Shorted Coplanar microstrip line” , Electric Letters, Vol.39, No. 13, 26th June 2003