圓極化整流天線於超高頻無線功率傳輸應用之研究

Study of the Circularly Polarized Rectennas for UHF Bands Wireless Power Transmission Applications

陳仁浩(Ren-Hao Chen)

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(2009年)

https://doi.org/10.6841/NTUT.2009.00484

摘要

本論文主要在於設計與研究應用於超高頻（925 MHz與2.45 GHz）無線功率傳輸之圓極化整流天線，包括了：一、圓極化寬槽孔天線之設計。藉由運用圓極化的原理與概念，使其在截取、接收傳播於自由空間中具任意極化之射頻電磁波能量時，不僅能有效降低多重路徑衰落，亦化解其於複雜環境傳播時，所引起的去極化等效應。二、利用晶片型元件完成濾波暨匹配網路之設計。如此不僅達到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，進而提升整體之轉換效率。三、整流倍壓電路之設計。其中，整流元件選擇適用於本論文規格，且亦符合整流倍壓電路設計需求之射頻蕭特基障壁二極體，藉此提高輸出直流電壓與系統轉換效率。
本論文所設計適用於超高頻無線功率傳輸系統之圓極化寬槽孔天線與其整流電路，亦經由實際量測與模擬軟體加以分析、相互驗證，藉以比較其與文獻間之相關參數與特性。可發現設計應用於超高頻無線功率傳輸系統之圓極化整流天線不僅能有較高之輸出直流電壓，且系統整體尺寸能有效縮小約65%以上。此外，其整體系統轉換效率上最高可以達到75%，而在功率偵測靈敏度方面最低則可達到-14 dBm左右。

關鍵字

整流天線 ； 圓極化 ； 槽孔天線 ； 整流倍壓電路 ； 功率轉換 ； 無線功率傳輸

並列摘要

In this thesis, the circularly polarized rectennas for Ultra High Frequency (UHF) bands (925 MHz and 2.45 GHz) wireless power transmission applications have been designed and studied. This study includes: 1. Design of a circularly polarized wide-slot antenna which can reduce the multi-path fading efficiently and solve the depolarization effect of random polarization in free space and complicate environment. 2. Design of the filter and matching network by using the chip components. It can not only achieve the impedance matching between the receiver antenna and voltage-doubler rectifier, but also suppress the higher order harmonics efficiently. 3. Design of the voltage-doubler rectifying circuit. A RF schottky barrier diode suitable for the current specification and the requirement for design of the voltage-doubler rectifying circuit is selected as a rectifying device of the circuit to increase the output DC voltage and RF-to-DC conversion efficiency.
A circularly polarized wide-slot antenna and a rectifying circuit for UHF bands wireless power transmission system applications not only based on the measurement and simulation, but also compare with the parameters and characteristics in literature. Our study showed that the designed circularly polarized rectenna for UHF bands wireless power transmission which not only has higher output DC voltage and greater RF-to-DC conversion efficiency with power detection sensitivity reaching as low as -14 dBm, but also exhibits up to 65% size reduction over the conventional design.

並列關鍵字

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

參考文獻

[2] 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 IEEE Region 10 Conf.(TENCON2004), Thailand, Nov. 2004, pp. 547-549.

[3] C. Walsh, S. Rondineau, M. Jankovic, G. Zhao, and Z. Popovic, “A conformal 10 GHz rectenna for wireless powering of piezoelectric sensor electronics,” in IEEE MTT-S Int. Microw. Symp. Dig., Long Beach, USA, Jun. 2005, pp. 143-146.

[4] J. O. McSpadden and K. Chang, “Passive 5.8-GHz radio-frequency identification tag for monitoring oil drill pipe,” IEEE Trans. Microw. Theory Tech., vol. 51, no. 2, pp. 356-363, Feb. 2003.

[6] T. C. Yo, C. M. Lee, C. H. Luo, C. H. Tu, and Y. Z. Juang, “Stacked implantable rectenna for wireless powering the medical implants,” in Proc. IEEE AP-S Int. Symp. Dig., Honolulu, Hawaii, Jun. 2007, pp. 3189-3192.

[7] P. Li and R. Bashirullah, "A wireless power interface for rechargeable battery operated medical implants," IEEE Trans. Circuits and Systems II, vol. 54, no. 10, pp. 912-916, Oct. 2007.