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 ...
K Maki   T Takano   A Fujiwara   A Yamori   
SPACE DEBRIS 34(5) 1085-1089 2004年
A hypervelocity impact causes the emission of radio-waves in the microwave frequency range. In order to understand the features of the phenomena and eventually to clarify the mechanism of the radio-wave generation, two kinds of experiments were ca...
K Maki   T Takano   A Fujiwara   A Yamori   
SPACE DEBRIS 34(5) 1085-1089 2004年
A hypervelocity impact causes the emission of radio-waves in the microwave frequency range. In order to understand the features of the phenomena and eventually to clarify the mechanism of the radio-wave generation, two kinds of experiments were ca...
T Takano   Y Murotani   K Maki   T Toda   A Fujiwara   S Hasegawa   A Yamori   H Yano   
JOURNAL OF APPLIED PHYSICS 92(9) 5550-5554 2002年11月
Microwave emission due to hypervelocity impacts on metallic plates has been found. The targets used in the experiment are aluminum plates with various thicknesses. The projectile, a nylon cylinder with metal screw of 0.21 gm, was accelerated up to...