期刊
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
卷 67, 期 1, 页码 402-413出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2018.2881127
关键词
Energy harvesting; grid-array antenna (GAA); high gain; multibeam; rectifying antenna; wireless power transfer (WPT)
资金
- National Natural Science Foundation of China [61622106, 61721001]
- Sichuan Science and Technology Program [2018RZ0142]
It is difficult to effectively rectify or convert low power in the circuit stage of harvesters. The high-gain antenna can offer a higher level of power and is beneficial to RF power harvesting in a low power density environment. To extend the narrow beam of the conventional high-gain rectenna, the multiport and multibeam antenna is promising. To pursue a simple configuration and avoid extra beamforming networks, a traveling-wave grid-array antenna (GAA) with two isolated ports and two symmetrically tilted beams is proposed. A prototype is designed and fabricated after a detailed analysis of the GAA with tilted beams and the coplanar stripline-based rectifier. The measured results show that the proposed rectenna is sensitive and effective in a wide-angle range. The harvesting angle range is extended by combining two tilted beams and can be greater than 70 degrees, where the level of dc power exceeds 100 mu W when the power density is as low as 1 mu W/cm(2). A maximum dc output of 3.6-203.8 mu W and a maximum RF-to-dc conversion efficiency of 16.3%-45.3% are available at 2.45 GHz, under the condition that the power density ranges from 0.052 to 1 mu W/cm(2).
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