應用於無線傳能之槽孔耦合雙圓極化整流天線設計

The Design of Slot-Coupled Dual Circular Polarized Rectenna for Wireless Power Transmission

翁國霖(Kuo-Lin Weng)

指導教授 ： 林丁丙

國立臺北科技大學/電資學院/電腦與通訊研究所/碩士(2012年)

https://doi.org/10.6841/NTUT.2012.00136

摘要

本論文目的為設計創新的天線結構，應用於無線功率傳輸之頻段接收2.45 GHz WLAN (IEEE 802.11b)之雙圓極化整流天線結合諧波抑制，可運用無線功率接收之課題上，將接收之射頻能量轉換為直流能量輸出，進而對充電電池充電，達到無線充電之目的。

本文針對台灣頻段2.45 GHz WLAN系統，提出工作在2.45 GHz之雙圓極化濾波整流天線，整體結構共可分為天線與整流電路兩個部分設計，第一部分天線選擇微帶天線來做主要設計，利用雙微帶線耦合饋入的方式搭配饋入線上的開路殘段，可達到雙圓極化以及阻抗匹配之目的，並且此雙圓極化天線具有諧振濾波之功，透過在地上加入槽孔之設計，達到2.45 GHz 頻段接收，天線整體尺寸為100×100×3.7 mm3。

第二部分為整流電路之設計，透過整流電路可將前端天線接收進來的射頻能量轉換為直流能量輸出，並可利用輸出之直流能量，對充電電池進行充電。當輸入功率為22 dBm與整流電路後方負載為1000 Ω時，整體整流電路在2.45 GHz量測之最大轉換效率與輸出電壓分別為81.94 %與11.45 V，得到良好的量測效能應用於無線傳能之課題上。

關鍵字

雙圓極化 ； 諧波抑制 ； 微帶天線 ； 整流天線 ； 整流電路 ； 轉換效率

並列摘要

This paper presents a dual circular polarized rectenna structure with harmonic rejection filter to receive 2.45 GHz WLAN (IEEE802.11b) system for Wireless Power Transmission(WPT). The proposed rectenna is suitable for the subject of wireless receiving, the receiving RF energy is converted to DC in order to charge the rechargeable battery for the purpose of wireless charge.

In this paper, proposed a dual-circular polarization filter rectenna for work in 2.45 GHz WLAN system. The structure can be divided into two parts of the design of the antenna and rectifier circuit. The first part of microstrip antenna for the main design, which are fed into pairs of microstrip coupled with open stub that achieve the purpose of the dual-circular polarization, impedance matching, and resonant filter, the design of slot on the ground plane, to reach 2.45 GHz band receiver, the antenna size is 100×100×3.7 mm3

The second part is the design of the rectifier circuit, the receiving RF energy which in front of the antenna, through the rectifier circuit can convert to DC output. The output of DC power can charge the rechargeable battery. While the input power is 22 dBm and the rectifier circuit load is 1000 Ω, the overall rectifier circuit in the 2.45 GHz band through the measurement of the maximum conversion efficiency and output voltage of 81.94 % and 11.45 V, respectively. The measured result shows a good performance for the WPT application.

並列關鍵字

dual circular polarized ； rectenna ； harmonic rejection ； rectifier circuit ； microstrip antenna ； conversion efficiency

參考文獻

[11] 李育易，應用於無線功率傳輸之圓極化整流陣列天線設計，碩士論文，國立臺北科技大學，台北，2011。

[46] 洪熙君，應用於無線功率傳輸之圓極化半波與全波倍壓整流天線設計，碩士論文，國立臺北科技大學，台北，2012。

[1] P. E. Glaser, “An overview of the solar power satellite option,” IEEE Trans. Microw. Theory Tech., vol. 40, no. 6, pp. 1230-1238, Jun. 1992.

[2] J. O. McSpadden and J. C. Mankins, “Space solar power programs and microwave wireless power transmission technology,” IEEE Microw. Magaz., vol. 3, no. 4, pp. 46-57, Dec. 2002

[4] Y. S. Na, J. S. Kim, Y. C. Kang, S. G. Byeon, and K. H. Rha, “Design of a 2.45 GHz passive transponder using printed dipole rectenna for RFID application,” in Proc. IEEE Region 10 Conf.(TENCON2004), Thailand, pp. 547-549 , Nov. 2004.