Affiliations: [a] Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore | [b] Research Center of Applied Electromagnetics, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China | [c] National University of Singapore Suzhou Research Institute, Suzhou, Jiangsu, China
Correspondence:
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Corresponding author: Yong-Xin Guo, Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576, Singapore/National University of Singapore Suzhou Research Institute, Suzhou, Jiangsu, China. Tel./Fax: +65 65162086; E-mail:eleguoyx@nus.edu.sg
Abstract: This article proposes a compact rectenna for wireless power transmission
(WPT) miniaturization applications. A specific rectenna design for powering
a wearable optical stimulator is presented. As a critical factor, the
required size of the rectenna should be within 1.5 × 1.5 × 1 cm3. The rectenna is formed by an antenna and a rectifying circuit,
which are designed separately and then integrated together. In order to make
full use of the limited size, a loop antenna is utilized in this design and
the rectifying circuit part is positioned inside the loop. In addition, to
further miniaturize the design, the rectifying circuit is directly matched
to the antenna without using of the matching circuit. After fabrication, the
rectenna is first linked to a resistive load to test its capability of
output DC power. Then, the rectenna is connected to a super-capacitor to
store the converted DC power. During the measurements, a standard horn
antenna is used to transmit the incident wave to the rectenna. It shows that
with proper power input to the transmitting horn antenna, the performed
voltage and harvested power of the rectenna can satisfy the design
requirements.
Keywords: Wireless power transmission, rectenna, miniaturization, loop antenna, rectifier
