臺灣博碩士論文加值系統

摘 要
本論文提出一以共面波導饋入之多頻帶操作平面式單極天線的新型設計，主要是以一個與饋入軸線呈固定夾角的隙縫，將共面波導信號線延伸形成之金屬微帶環分隔為長弧段與短弧段兩部分，形成能同時共振兩操作頻段的雙頻操作單極天線。同時由天線金屬微帶的直線段延伸出一個環繞於天線金屬微帶環中長弧段外圍的耦合環形金屬微帶，以激發一個與長弧段所激發頻帶相鄰的頻段，並使其相互靠近且結合成為一寬頻操作頻帶，達成可操作於四個規範頻帶的低剖面平面式單極天線。
此一設計不但可以在實務製作前，依明確的設計規則得到預期的天線結構與尺寸，且因採用共面波導饋入的方式，在製作程序上可與天線輻射本體一次完成以及利於與微波積體電路相整合。同時在輻射特性上具有不錯的全向性輻射場型、操作頻帶內2dBi左右的天線增益位準及1dBi範圍內的增益變化量。

Abstract
This thesis proposes a new design of a coplanar-waveguide-fed planar monopole antenna for multi-band operation. Two resonant frequency bands are excited by cutting a ring-shaped metal strip of monopole antennas into two sections with a slit at an angle with respect to the CPW feed line. The two sections are termed long-arc and short-arc sections according to their respective arc lengths. By surrounding the long-arc section of the ring-shaped metal strip with an arc-shaped strip protruded from the straight section of the antenna strip, a new resonant frequency band can be excited at the adjacent frequency band excited by the long-arc section of the ring-shaped metal strip. And, by properly tuning the length of the arc-shaped strip, these two frequency bands can be excited close enough to form a wide operating bandwidth which contains three specified bands.
The dimensions of the proposed antenna design can be predicated by a simple and clear design rule. Feeding by CPW transmission line, the antenna design can be easily implemented and integrated with microwave circuits. Also, the proposed antenna has good omni-directional radiation patterns. The measured antenna gain for operating frequencies within the obtained wide bandwidth is about 2dBi and within a variation of less than 1 dBi.

目 錄
中文摘要………………………………………………………....i
英文摘要……………………………………….…………….... ii
目錄..……………………….………….………………………….. iii
圖目錄……………….……………………………………….…v
表目錄……………….……………………………………….…..ix
縮寫及符號對照表…….………………………………………x
第一章序論…………………………………………………..1
1.1 研究動機..……….…………………………………………..1
1.2 內容提要…………………………………………………….1
第二章 以共面波導饋入之雙頻及寬頻操作單極天線……..……….....3
2.1 簡述 …………………………………………..….….………3
2.2 天線設計……..………………………..……………………..4
2.3結果與討論………………………..……..…………….……...5
第三章 共面波導饋入之三頻帶操作平面式單極天線..……..……….16
3.1 概述 …….………....…………………………..…….……..16
3.2天線設計…....………….….……………………………….17
3.3 結果與討論..………...…………………………..………….18
3.3.1分隔角度a及直線段長度l對於天線操作頻帶特性的影響……………………………....…………..….…………18
3.3.2 增加雙頻操作單極天線低頻帶操作頻寬之設計…...…20
第四章 共面波導饋入式之雙頻單極天線………………………......35
4.1簡述……………………………………………….………. 35
4.2 天線設計……………………..….……………….………. 35
4.3 實驗與模擬結果之討論..…………………………………. 36
第五章 結論…………………….…………….…………………..48
參考文獻………………………………….………….…….…………49

參考文獻
[1]E. Lee, P.S. Hall, and P. Gardner,“Dual band folded monopole/loop antenna for terrestrial communication system,” Electron Lett., vol. 36, pp. 1990-1991, 2000.
[2]E. Lee, P.S. Hall, and P. Gardner,“Compact wideband planar monopole antenna,” Electron Lett., vol. 35, pp. 2157-2158, 1999.
[3]N.P. Agrawall, G Kumar, and K.P. Ray,“Wide-band planar monopole antennas,” IEEE Trans. Antennas Propagat., vol. 46, no. 2, pp. 294-295, Feb. 1998.
[4]J.I. Moon, S.O. Park, and K.Y. Park,“Broadband sleeve monopole type antenna for dual-band PCS/IMT-2000,” Electron Lett., vol. 36, pp. 1829-1830, 2000.
[5]P. Eratuuli, P. Haapala, and P. Vainikainen,“Dual frequency wire antennas,” Electron Lett., vol. 32, pp. 1051-1052, 1996.
[6] Y. F. Lin, H. D. Chen, and H. M. Chen,“A dual-band
printed L-shaped monopole for WLAN applications,” Microwave Opt.Technol.Lett., vol. 37, 3, May 5 2003.
[7]H. M. Chen, Y. F. Lin, C. C. Kuo and K. C. Huang,“A compact dual band microstrip-fed monopole antenna,” IEEE Antenna’s and Propagation Society Interational Symposium., vol. 2, pp. 124-127, 2001.
[8]B. K. Kormantos, W. Harokoupos, L. P. Katehi, and G. M. Rebeiz,“CPW-fed active slot antennas,” IEEE Trans. Microwave Theory Tech., vol.42, pp. 541-545, 1994.
[9]L. Giauffret and J .M. Laheurte,“Theoretical and experimental characterization of CPW-fed microwave antennas,” Proc . Inst. Elect. Eng. Microwave, Antennas Propagat., Pt. H, vol. 143, pp. 13-17, 1996.
[10] G. Forma and J. M. Laheurte,“CPW-fed oscillating microstrip antennas,” Electron Lett. , vol. 32, pp. 85-86, 1996.
[11]R. L. Smith and J. T. Williams,“Coplanar waveguide feed for microstrip patch antennas,” Electron Lett., vol. 28, pp. 2272-2274, 1992.
[12]S. M. Deng, M. D. Wu, and P. Hsu,“Analysis of coplanar waveguide waveguide-fed microstrip antennas,” IEEE Trans. Antennas Propagat., vol. 43, pp. 734-737, 1995.
[13]K. Tilly,X. D. Wu, and K. Chang,“Coplanar waveguide fed coplanar strip dipole antennas,” Electron Lett., vol. 30, pp. 176-177, 1994.
[14]M. I. Aksun, S. L. Chuang, and Y. T. Lo,“Coplanar waveguide-fed microstrip antennas,” Microwave Opt. Technol. Lett., vol. 4, pp. 292-295, 1991.
[15]G. Bianchi, “Performance Analysis of the IEEE 802.11 Distributed Coordination Function,” IEEE J. on Sel. Areas in Comm., vol. 18, No. 3, pp. 535-547, 2000.
[16]F. Cali, M. Conti, E. Gregori, “IEEE 802.11 Protocol : Design and Performance Evaluaion of an Adaptive Backoff Mechanism”, IEEE J. on Sel. Areas in Comm., vol. 18, No. 9,pp. 1774-1786, 2000.
[17]H.S. Chhays and S. Gupta, “Performance Methods in the IEEE 802.11 MAC Protocol”, ACM/Baltzer Wireless Net-works, vol. 3, pp 217-234, 1997.
[18] C. P. Wen,“Coplanar waveguide: a surface strip transmission line suitable for nonreciprocal gyromagnetic device application,” IEEE Trans. Microwave Theory Tech., vol.17, pp. 1087-1090, Dec, 1969.
[19]H. C. Liu, T. S. Horng and N. G. Alexopoulous,“Radiation of printed antennas with a coplanar waveguide-fed,” IEEE Trans. Antennas Proporgat., vol. 10, pp. 1143-1148, 1995.
[20]J. W. Greiser,“Coplanar stripline antenna,” Microwave Journal, vol. 21, pp. 47-49, 1976.
[21]A. R. Potter, “Implementation of PCNs using DCS 1800,” IEEE Commun. Mag., Dec, pp. 32-36, 1992.
[22]P. A. Ramsdale, “Personal Communications in the UK-implementation of PCN using DCS 1800,” Int. J of Wireless Inf. Network, vol. 1, no. 1, pp. 29-36,1994.
[23]S. Unawong, S. Miyamoto and N. Morinaga, “Techniques to Improve the Performance of Wireless LAN under ISM interference Environments,” IEEE communication, 1999 APCC/OECC, vol. 1, pp. 802-805 Oct. 1999.
[24]J. C. Haartsen, “The Bluetooth radio system,”IEEE Pers. Commun, vol. 7, pp. 28-36, Feb. 2000.
[25]Bluetooth Special Interest Group, Specification of the Bluetooth System v1. 1, Feb. 22, 2001
[26]M. Ali, G. J. Hayes, H. S. Hwang and R. A. Sadler, “Design of a Multiband Internal Antenna for Third Generation Mobile Phone Handsets,”IEEE Trans. Antenna Propagat., vol. 51, no. 7, pp. 1452-1461, July 2003.
[27]S. Chia, “The Universal Mobile Telecommunications System,” IEEE Commun. Mag., vol. 30, no. 12, pp. 54-62, Dec. 1992.