Proceedings of the International Astronautical Congress, IAC 2020-October 2020年 [査読有り]
Martian Moons eXploration (MMX) is a mission to Martian moons under development in JAXA with international partners to be launched in 2024. This paper introduces the system definition and the latest status of MMX program. “How was water delivered ...
PROCEEDINGS OF THE IEEE 101(6) 1438-1447 2013年6月 [査読有り]
A solar power satellite (SPS) is a renewable energy system that converts the sun's energy into electricity in space and transmits it to Earth using microwaves. The SPS concept, first proposed in 1968 in the United States, has recently started attr...
Koji Uematsu   Ken-ichiro Maki   Chiko Otani   
OPTICS EXPRESS 20(20) 22914-22921 2012年9月 [査読有り]
A terahertz (THz) beam steering method is demonstrated by applying the characteristic of grating lobe (GL) radiation from a linear array antenna and the interference of femtosecond optical pulses. A photoconductive device is illuminated by two fem...
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES 32(5) 603-617 2011年5月 [査読有り]
We have investigated the characteristics of a terahertz (THz) beam steering method based on a combination of difference-frequency generation (DFG) with the principle of the phased array antenna. In the DFG of THz radiation from a nonlinear optical...
Koji Uematsu   Ken-ichiro Maki   Chiko Otani   
2011 36TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ) 2011年 [査読有り]
We present a THz beam steering method that is based on the generation of grating lobe(GL) radiation from linear array antenna and interference principle of femtosecond laser beam. THz GL radiation with the bandwidth of 110GHz was generated from a ...
We report on the generation of broadband terahertz (THz) pulses using Cherenkov-type generation in magnesium oxide-doped lithium niobate (MgO:LN). The efficiency of the output coupling process of THz radiation at higher frequencies into free space...
Microwave emissions due to hypervelocity impacts and their dependence on the target material are described. Microwave signals were measured for four kinds of target materials: aluminum, alumina ceramic, red brick, and polyurethane rubber. The sign...
Microwave emissions due to hypervelocity impacts and their dependence on the target material are described. Microwave signals were measured for four kinds of target materials: aluminum, alumina ceramic, red brick, and polyurethane rubber. The sign...