利用背覆倒U形金屬環與微帶線之耦合產生寬頻圓形極化天線

BROADBAND CIRCULARLY POLARIZED ANTENNA THROUGH COUPLING OF AN L-SHAPED MONOPOLE TO A U-SHAPED STRIP RING

孫志強(Chih-Chiang Sun)

指導教授 ： 張知難

大同大學/電機資訊學院/電機工程學系所/碩士(2011年)

摘要

本論文研製一圓形極化單極天線，天線結構主要由倒L形單極天線與倒U形微帶線所組成，在圓形極化設計上利用倒L形饋入線讓原本只有單一垂直分量的單極天線產生水平方向的分量，具有圓形極化的特性，再利用背覆的倒U形微帶線獲得更寬的圓形極化操作頻段。天線之特性經實驗量測在10dB折返損耗的操作頻帶是由2.1 GHz至3.9 GHz，頻寬為60%，圓形極化軸比值的操作頻帶是由2.1 GHz至3.9 GHz，頻寬為60%，天線增益在2.1 GHz至3.9 GHz頻段中都分佈在1.75 dBic - 3.75 dBic之間，應用於2.3-2.5 GHz頻段的移動式及3.3-3.8 GHz頻段的固接式全球互通微波存取(WiMAX) ，也可以適用於2.4GHz頻段的無線區域網路(WLAN)。

關鍵字

倒U形金屬環

並列摘要

In this thesis, a wideband circularly polarized antenna for WiMAX and WLAN band applications is presented , this antenna uses an inverted L-shaped monopole coupling to a U-shaped strip ring the strip ring is etched on the back side of the monopole, this antenna operates a return–loss bandwidth of 1.9GHz(2.1-4.0GHz) and an axial-ratio bandwidth of 1.8GHz (2.1-3.9GHz) and the peak antenna gain in 2.1-3.9GHz is around 1.75dBic to 3.75dBic .

並列關鍵字

WLAN ； WiMAX ； Monopole antenna ； circular polarization ； inverted U-shaped ； inverted L-shaped

參考文獻

[1]Y.-L. Kuo and K.-L. Wong, “Printed Double-T Monopole Antenna for 2.4/5.2 GHz Dual-Band WLAN Operations,” IEEE Trans. Antennas and Propagation, vol. 51, no. 9, pp. 2187-2191, Sept. 2003.

[2]J.-Y. Jan and L.-C. Tseng, ”Small Planar Monopole Antenna With a Shorted Parasitic Inverted-L Wire for Wireless Communications in the 2.4-,5.2-, and 5.8-GHz Bands,” IEEE Trans. Antennas and Propagation, vol. 52, no. 7, pp. 1903-1905, July 2004.

[3]J.-H. Lu and W.-C. Chou ,”Planar Dual U-Shaped Monopole Antenna With Multiband Operation for IEEE 802.16e,” IEEE Antennas and Wireless Propagation Letters, vol. 9, pp. 1006-1009, 2010.

[4]洪一平, ”利用疊層槽孔環改善微帶天線圓形極化之特性,”大同大學碩士論文, 2010年.

參考文獻