應用於無線功率傳輸之圓極化整流陣列天線設計

Design of Circularly Polarized Array Rectenna for the Applications of Wireless Power Transmission

李育易(Yu-Yi Lee)

指導教授 ： 孫卓勳

國立臺北科技大學/電資學院/電腦與通訊研究所/碩士(2011年)

https://doi.org/10.6841/NTUT.2011.00176

摘要

本論文主要研究應用於無線功率傳輸之圓極化整流陣列天線之設計，操作於無線微波頻段(microwave frequency)，並具有截取、接收於自由空間中具任意極化之射頻電磁波能量之用途；在天線後端使用晶片型元件設計低通濾波器(low-pass filter)暨匹配網路與整流倍壓電路，以達接收天線與整流倍壓電路間之阻抗匹配，亦能有效抑制其高次諧波且縮小整體體積，也能提升輸出的直流電壓與整體之轉換效率，解決傳統無線應用產品使用常需充電等問題。本研究之無線功率傳輸技術，係藉以電磁波功率作為充電電力來源，結合圓極化整流陣列天線，實現自給電源之天線應用。
本論文所設計2.4 GHz之圓極化槽孔陣列天線、低通濾波器暨匹配網路與整流倍壓電路，阻抗頻寬或軸比頻寬符合IEEE 802.11b(2.4~2.485 GHz)之相關規範，其天線增益約為6~7.2 dBi左右。本研究陣列天線與電路整合其整體系統所接收最大電壓可達6.5伏特，其系統轉換效率最高可達70%。

關鍵字

無線功率傳輸 ； 圓極化 ； 整流陣列天線 ； 槽孔陣列天線 ； 整流倍壓電路

並列摘要

In this thesis, circularly polarized array rectenna for the applications of wireless power transmission has been studied. The proposed array antenna is operating at Microwave Frequency which intercepts and receives the RF energy of any polarization wave in free space. Low-pass filter, matching network and voltage-doubler rectifier are designed for impedance matching after the receiver antenna as well as to suppress the high order harmonics efficiently and minify the circuit size. It also solved the problem of traditional electric products battery charging. The technology of wireless power transmission for a rectenna by using the electromagnetic power as a charging resource, combine with the circular polarized array rectenna to achieve self-sufficiency application.
The proposed design of circular polarized slot array antenna, Low-pass filter, matching network and the voltage-doubler rectifier which exhibit bandwidth and axial ratio bandwidth are following the specification of IEEE 802.11b (2.4~2.485 GHz). The result of the antenna gain is about 6~7.2 dBi. With the present design, a maximum voltage of 6.5 V and a conversion efficiency of 70 % colud be attainable.

並列關鍵字

wireless power transmission ； circularly polarized ； array rectenna ； slot array antenna ； voltage-doubler rectifier

參考文獻

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