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To date no technical-economic-environmental review has been carried out on the use of hybrid wind-solar power plants in Japan. The study reported in this paper used HOMER soft- ware to analyze the electricity supply from renewable energy systems at 198 stations in Japan. The ranges of wind speed and solar radiation of the locations are 1.6-12 m/s and 2.723- 5.435 kWh/m2-day, respectively. The results show that the average, maximum and minimum use of renewable energy in Japan are 96.2%, 100% and 89%, respectively. Also, the av- erage, maximum and minimum cost per kWh of energy are $ 0.434, $ 0.526, and $ 0.249, respectively. The cheapest wind turbine system (the cheapest renewable energy system), the cheapest solar system, the cheapest hybrid wind-solar system, and the most expensive hybrid system, have a price per kWh of energy $ 0.294, $ 0.349, $ 0.339 and $ 0.526, respectively. These systems are located at Fuji Mountain, Minamitorishima, Iwojima and Tokyo, respectively. [ABSTRACT FROM AUTHOR]

This article reports a fabrication of a rectifier based on Hybrid Semiconductor Integrated Circuit (HySIC) technology and microwave wireless power transfer experiment using the fabricated rectifier at 5.8 GHz. The purpose of this study is developing all‐wireless sensor network systems in space satellites, reducing the launching costs, and contributing to space technology development. The HySIC rectifier blends the merits of gallium nitride (GaN) Schottky barrier diodes whose resistivity to cosmic rays is high and silicon (Si) matching circuits whose circuit integration process is excellent. The size and RF‐DC conversion efficiency of the fabricated HySIC rectifier were 3.9 mm × 9.5 mm and 10.3% with a load of 150 Ω at 5.8 GHz, respectively. A microwave wireless power transfer experiment was conducted at a distance of 0.2 m. The system conversion efficiency, which includes the effects of the HySIC rectifier, transmitting antenna, receiving antenna, cables, and space of 0.2 m, was 0.014%. The microwave wireless power transfer experiment using the HySIC rectifier was demonstrated for the first time in the world. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. [ABSTRACT FROM AUTHOR]