Recent wireless power transmission via microwave and millimeter-wave in Japan

In this paper, a technology based on thin flexible polyimide substrate (Kapton) to develop antennas for millimeter wave wireless power transmission is presented. Firstly, we characterize the Kapton polyimide (relative permittivity and loss tangent) using a ring resonator method up to V band. A 60 GHz patch antenna is designed, fabricated, and measured to validate our technology. Crossed-dipoles array antennas at Kuband and K band for energy harvesting are also designed, fabricated, and measured. Then a prototype of crossed-slot dipole antenna at V band is proposed. Finally, a resistivity characterization of Au bump used in flip-chip packaging is done, which leads us one step further toward aheterogeneous integration on flexible substrate of different components for Wireless Sensor Network nodes.

Download Full-text

A High-Efficiency 24 GHz Rectenna Development Towards Millimeter-Wave Energy Harvesting and Wireless Power Transmission

IEEE Transactions on Circuits and Systems I Regular Papers ◽

10.1109/tcsi.2014.2338616 ◽

2014 ◽

Vol 61 (12) ◽

pp. 3358-3366 ◽

Cited By ~ 64

Author(s):

Shabnam Ladan ◽

Ajay Babu Guntupalli ◽

Ke Wu

Keyword(s):

Energy Harvesting ◽

Millimeter Wave ◽

Wave Energy ◽

High Efficiency ◽

Power Transmission ◽

Wireless Power ◽

Wireless Power Transmission ◽

24 Ghz

Download Full-text

Investigation on a 220 GHz Quasi-Optical Antenna for Wireless Power Transmission

Electronics ◽

10.3390/electronics10050634 ◽

2021 ◽

Vol 10 (5) ◽

pp. 634

Author(s):

Meng Han ◽

Xiaotong Guan ◽

Moshe Einat ◽

Wenjie Fu ◽

Yang Yan

Keyword(s):

Gaussian Beam ◽

Millimeter Wave ◽

Power Transmission ◽

Divergence Angle ◽

Wave Radiation ◽

Optical Antenna ◽

Wireless Power ◽

Wireless Power Transmission ◽

Output Beam ◽

Long Distance

This paper investigates a 220 GHz quasi-optical antenna for millimeter-wave wireless power transmission. The quasi-optical antenna consists of an offset dual reflector, and fed by a Gaussian beam that is based on the output characteristics of a high-power millimeter-wave radiation source-gyrotron. The design parameter is carried on by a numerical code based on geometric optics and vector diffraction theory. To realize long-distance wireless energy transmission, the divergence angle of the output beam must be reduced. Electromagnetic simulation results show that the divergence angle of the output beam of the 5.6 mm Gaussian feed source has been significantly reduced by the designed quasi-optical antenna. The far-field divergence angle of the quasi-optical antenna in the E plane and H plane is 1.0596° and 1.0639°, respectively. The Gaussian scalar purity in the farthest observation field (x = 1000 m) is 99.86%. Thus, the quasi-optical antenna can transmit a Gaussian beam over long-distance and could be used for millimeter-wave wireless power transmission.

Download Full-text