雙頻印刷式偶極天線之設計及主動天線接收系統之研究

Design of Dual-Band Printed Dipole Antennas and Study of Active Antenna Systems

李建樺(Chien-Hua Li)

指導教授 ： 林怡成

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2005年)

https://doi.org/10.6342/NTU.2005.00878

摘要

在本篇論文中，吾人設計了兩個適用於無線區域網路之射頻天線，一個是操作在IEEE802.11b頻段的雙階梯式微帶線饋入之矩型開槽天線，另一個則是操作於整個IEEE802.11a/b/g頻段的雙頻微帶線饋入之印刷偶極天線，此兩種天線皆以全波模擬軟體IE3D及HFSS進行頻段掃描模擬，並針對天線尺寸參數做深入探討，以了解個別參數對輸入阻抗、共振頻率、反射損失及遠場輻射場型的影響。
矩型開槽天線以雙階梯式微帶線饋入來增加其寬頻的效能，頻寬大約41.2%，幾乎包含了2GHz~3GHz，此外也針對接地平板作體積縮小化的研究，在縮小面積與高頻寬效能中做最佳取捨。雙頻微帶線饋入之印刷偶極天線針對多頻帶天線效能做研究，以涵蓋整個無線區域網路所定義的頻段作探討，也是以拉寬天線的頻寬作為設計目標。
最後，將吾人設計的開槽天線與主動低雜訊放大器結合，以主動天線模組進行輻射場型的量測。主動接收系統的研究也會在本論文中提及，並以理論證明天線與LNA若能結合成單一模組，將會減少整個系統的Noise Figure，增加系統之靈敏度，實際應用面也會討論於其中。

關鍵字

微帶天線 ； 雙頻天線 ； 主動天線

並列摘要

In this thesis, we have designed two antennas, one is double step-type microstrip line fed rectangular slot dipole antenna operated at the band of IEEE 802.11b, the other is the microstrip line fed dual-band printed dipole antenna operated at the band of IEEE 802.11a/b/g. Full-wave simulation software IE3D & HFSS used in this thesis, the resonant frequencies, bandwidth, return loss, input impedance and radiation pattern are studied completely by various antenna size parameter. Step-type MS line feeding enhances the bandwidth, the bandwidth covering 2GHz~3GHz is about 41.2%.Furthermore,we try to reduce ground size, and then we trade-off between size and bandwidth. MS line fed dual-band printed dipole antenna are studied to cover 2.4GHz~2.4835GHz, 5.15GHz~5.35GHz, 5.725GHz~ 5.825GHz for all WLAN IEEE802.11a/b/g.
Finally, we combine with the low noise amplifier and the double step-type microstrip line fed rectangular slot dipole antenna, and then we measure the radiation pattern for this active antenna module. The total noise figure of all receivers is discussed. The research of the RF receiving system will be mentioned in this thesis, too.

並列關鍵字

Microstrip Antenna ； Dual-Band Antenna ； Active Antenna

參考文獻

[2] B. tuch, “Development of WaveLAN, and ISM Band Wireless LAN,” AT&T

[3] Andrew S. Tanenbaum, Computer Networks, Prentice-Hall, Inc,. pp. 94-99,

[5] I. J. Bahl and P. S. Bhartia, Microstrip Antennas, Artech House, Dedham,

MA, USA, 1980. Chapters 1, 2.

[6] D. M. Pozar, "Microstrip antennas," Proc. IEEE, vol. 80, no. 1, pp.79-91,