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This study proposes a simple method for creating flat beam patterns in a near-field. In radio-wave transmission, the near-field beam efficiency of the beam-type wireless power transfer (WPT) system theoretically reaches 100%, but the beam pattern is not flat in the near field. In real beam-type WPT systems, the total beam efficiency (DC-RF-transmission, beam efficiency, and RF-DC conversion) can be...
The biggest advantage of microwave power charging for electric vehicle (EV) is the capability of charging for a running vehicle. However, the commercial application of microwave charging EV is still difficult because of some issues including technologies and safety. This paper introduces a 100 kW high-power class microwave power transfer (MPT) for electric vehicle such as a truck or a bus with 5.8...
In this study, we examined the microwave power transfer to sensors in a car engine compartment. First, we calculated the transmission efficiency in free space. We changed the transmission distance, and confirmed a theoretical limit value of the transmission efficiency in free space. Second, we simulated the transmission efficiency using the engine compartment model. We changed the direction of the...
One of the most important technology of the receiving antenna in wireless power transmission is matching technique to receive microwave which reach at the antenna surface. Especially, in the case of the microwave power transmission with high power, energy confinement is significant for human safety and compatibility with other wireless system as well as for efficiency improvement. In this paper, matching...
Various wireless power transmissions (WPT) are applied to charge an electric vehicle (EV). An inductive coupling WPT and resonance coupling WPT are often used. We proposed a WPT via microwave (microwave power transmission; MPT) for the wireless charging of the EV because we consider that merits of the MPT, which are mid or far distance WPT and no coupling between a transmitter and a receiver, are...
A SPS (Solar Power Station / Satellite) is a gigantic satellite designed as an electric power plant and transmits the electricity via microwave to a receiving site on the Earth by using a phased array antenna. In Japan, a panel structure SPS was proposed. The panel structure SPS is difficult to maintain flatness of transmission antenna surface. Thus we study on a microwave power beam correction method...
A SPS (Solar Power Station / Satellite) is a gigantic satellite designed as an electric power plant and transmits the electricity via microwave to a receiving site on the Earth by using phased array antennas. We study on a microwave beam controlling method of the phased array antenna to achieve the efficient power transmission. In this paper, we describe a PAC (Position and Angle Correction) method...
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