應用於無線功率傳輸之雙頻圓極化整流天線之設計

Design of a Dual-Band Circularly Polarized Rectenna for the Application of Wireless Power Transmission

劉少凱(Shao-Kai Liu)

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(2010年)

摘要

本論文主要研究應用於無線功率傳輸之雙頻圓極化整流天線之設計，首先提出一操作於2.45/5.8 GHz之雙頻圓極化槽孔天線，以作為無線功率傳輸之前端接收天線，其具有截取、接收於自由空間中具任意極化之射頻電磁波能量之用途；使用晶片型元件設計低通濾波器暨雙頻匹配網路，以達接收天線與整流倍壓電路間之阻抗匹配，亦能有效抑制其它高次諧波且縮小整體體積，進而提升整體之轉換效率，並將圓極化天線與匹配網路暨整流倍壓電路整合，以量測輸出直流電壓與轉換效率。
本論文所設計之雙頻圓極化天線與雙頻匹配網路暨整流倍壓電路，阻抗頻寬或軸比頻寬皆符合IEEE 802.11b(2.4~2.485 GHz)與IEEE 802.11a(5.725~5.825 GHz)之相關規範，其天線增益約為3.5~6 dBi左右。本研究天線與電路整合其整體系統所接收最大電壓可達5.4伏特，其系統轉換效率最高可達55%。

關鍵字

無線功率傳輸 ； 圓極化 ； 整流天線 ； 槽孔天線 ； 整流倍壓電路

並列摘要

In this thesis, dual-band circularly polarized rectennas for the applications of wireless power transmission have been studied. The proposed design of dual-band circularly polarized antenna operating at 2.45/5.8 GHz can interception and receive the RF energy of random polarization in free space. Low-pass filter and dual-band matching network are designed for impedance matching between the receiver antenna and voltage-doubler rectifier as well as to suppress the higher order harmonics efficiently. The circularly polarized antenna and matching network for voltage-doubler rectifier, measured output voltage with conversion efficiency are also studied in the thesis.
The designed dual-band circularly polarized antenna and matching network voltage-doubler rectifier circuit exhibit bandwidth and axial ratio bandwidth meet that can the specification of IEEE 802.11b (2.4~2.485 GHz) and IEEE 802.11a (5.725~ 5.825 GHz). The result of the antenna gain is about 3.5~6 dBi. With the present design, a maximum voltage of 5.4 V with a conversion efficiency up to 55% is attainable.

並列關鍵字

wireless power transmission ； circularly polarized (CP) ； Rectifying antenna (Rectenna) ； slot antenna ； voltage-doubler rectifier

參考文獻

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