Experimental Study on a Retrodirective System Utilizing Harmonic Reradiation from Rectenna

A retrodirective system utilizing harmonic reradiation from a rectenna is developed and verified for long-range wireless power transfer applications, such as low-power or battery-less devices and lightweight aerial vehicles. The second harmonic generated by the rectifying circuit is used instead of a pilot signal, and thus an oscillator for creating the pilot signal is not required. The proposed retrodirective system consists of a 2.45 GHz transmitter with a two-element phased array antenna, a 4.9 GHz direction-of-arrival (DoA) estimation system, a phase control system, and a rectenna. The rectenna, consisting of a half-wave dipole antenna, receives microwave power from the 2.45 GHz transmitter and reradiates the harmonic toward the 4.9 GHz DoA estimation system. The rectenna characteristics and experimental demonstrations of the proposed retrodirective system are described. From measurement results, the dc output power pattern for the developed retrodirective system is in good agreement with that obtained using manual beam steering. The measured DoA estimation errors are within the range of −2.4◦ to 4.8◦. key words: wireless power transfer, rectenna, harmonics reradiation, retrodirective system, direction-of-arrival estimation

[1]  Hubregt J. Visser,et al.  RF Energy Harvesting and Transport for Wireless Sensor Network Applications: Principles and Requirements , 2013, Proceedings of the IEEE.

[2]  P. Glaser.  Power from the sun: its future. , 1968, Science.

[3]  Tomohiko Mitani,et al.  Analysis of Voltage Doubler Behavior of 2.45-GHz Voltage Doubler-Type Rectenna , 2017, IEEE Transactions on Microwave Theory and Techniques.

[4]  William C. Brown,et al.  The History of Power Transmission by Radio Waves , 1984 .

[5]  Susumu Sasaki,et al.  Microwave Power Transmission Technologies for Solar Power Satellites , 2013, Proceedings of the IEEE.

[6]  Regan Zane,et al.  Low-Power Far-Field Wireless Powering for Wireless Sensors , 2013, Proceedings of the IEEE.

[7]  Ivan Stojmenovic,et al.  RFID Systems: Research Trends and Challenges , 2011 .

[8]  Pedro Pinho,et al.  A Low Complexity and Accurate Battery-Less Trackable Device , 2018, 2018 IEEE/MTT-S International Microwave Symposium - IMS.

[9]  Naoki Shinohara,et al.  Study on rectenna harmonics reradiation for microwave power transfer with a harmonics-based retrodirective system , 2016, 2016 International Symposium on Antennas and Propagation (ISAP).

[10]  Naoki Shinohara,et al.  Direction-of-Arrival Estimation by Utilizing Harmonic Reradiation from Rectenna , 2018, 2018 IEEE Wireless Power Transfer Conference (WPTC).

[11]  N. Shinohara,et al.  Power without wires , 2011, IEEE Microwave Magazine.

[12]  Naoki Honma,et al.  DoA estimation technique of back-scattering signal from RFID for gesture recognition , 2015, 2015 9th European Conference on Antennas and Propagation (EuCAP).

[13]  Paul Jaffe,et al.  Energy Conversion and Transmission Modules for Space Solar Power , 2013, Proceedings of the IEEE.

[14]  Federico Viani,et al.  Array Designs for Long-Distance Wireless Power Transmission: State-of-the-Art and Innovative Solutions , 2013, Proceedings of the IEEE.

[15]  Kai Chang,et al.  Microwave Power Transmission: Historical Milestones and System Components , 2013, Proceedings of the IEEE.