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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...
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...
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...
In recent years, there has been increased interest in contactless power transfer technologies in various fields such as home electric appliances or electric vehicles. In particular, researches on contactless power transfer for electric vehicles have been examined all over the world and attracted a great deal of public attention in terms of global warming prevention, energy conservation and so forth...
Ubiquitous power source can wirelessly transmit power anywhere in a space. In order to realize this system, we have examined an efficient power transmission system which sends power to necessary places only based on direction of arrival measurement. A simple in-phase transmission array is proposed and evaluated as useful and efficient. This system can send power to multiple receivers. In order to...
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