應用於無線功率傳輸之陣列雙極化整流天線設計

Design of Dual-Polarized Rectenna Array for Wireless Power Transmission

邱冠智(Kuan-Chih Chiu)

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(2014年)

https://doi.org/10.6841/NTUT.2014.00056

摘要

本論文提出一寬頻陣列雙極化天線設計，陣列天線單元為在單極天線接地面加入矩形槽孔，搭配步階式饋入調整天線阻抗匹配，以達成增加阻抗頻寬之目的，陣列天線單元的頻寬為1702-2755 MHz (47.2%)。此外，利用不對稱接地面及朝左開口的矩形槽孔使天線輻射場型偏移，而後將此天線設計結合饋入網路並相互正交擺放完成陣列雙極化天線，調整兩天線距離使其雙極化天線阻抗頻寬與兩天線隔離度皆符合DCS 1800 / PCS 1900 / CDMA 2000 / UMTS / Wi-Fi 2.4規範。
將上述天線應用於無線功率傳輸，以陣列雙極化天線作為整流天線之前端，接收自由空間中能量分佈最多的2.4 GHz垂直和水平極化之射頻電磁波能量。利用蕭特基二極體設計倍壓整流電路並量測其輸入阻抗值，利用晶片型元件設計天線與整流電路間之匹配電路，能有效抑制其高階諧波且縮小整體體積，最後將雙極化天線與整流電路作整合，以量測整體輸出直流電壓與轉換效率，其轉換最大電壓第一埠可達8.13伏特，第二埠則可接收到8.2伏特，其整體系統轉換效率最高可達78.8%。

關鍵字

寬頻陣列雙極化天線 ； 無線功率傳輸 ； 整流天線 ； 倍壓整流電路

並列摘要

A broadband dual-polarized microstrip array antenna designed is proposed. To achieve wide 10 dB bandwidth for broadband operation, the technique of applying a ladder-shaped monopole antenna type with a rectangular slot insertion in the ground plane is implemented.The proposed design showed wide impedance bandwidth of the 1702-2755 MHz (47.2%). In addition, loading an open slot into the rectangular radiating element with an asymmetric ground plane was used and resulted in a slightly displacement of the radiation pattern. The 1 × 2 array type for two ladder-shaped patch array elements are arranged in symmetric feed network. By meticulously arrangement the two array antennas’ positions to achieved good ports isolation, with 10 dB bandwidth for the operating bands in free-space can be achieved.
This antenna was used as a rectenna (rectifying antenna), which receives the RF energy of vertical and horizontal polarization wave in free space for 2.4 GHz wireless powering transmission. The rectifier circuit setup using two zero biased rectifier and voltage doubler circuit. A matching network designed with small size chip components have a significant improvement in impedance matching and eliminate high order harmonics between the antenna and rectifying circuit. The proposed dual-polarized rectenna provided the RF-to-DC conversion efficiency as high as 78.8% when 14 dBm microwave power was received at 2.4 GHz with a 1 KΩ load.

並列關鍵字

Dual-polarized ； microstrip array antenna ； rectenna ； wireless power transmission ； voltage doubler circuit

參考文獻

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