title: Development of microwave imaging reflectometry in large helical device.
abstract: Three key devices of the microwave imaging reflectometry (MIR) are under development in large helical device (LHD). The 2-D mixer array is developed by stacking the one-dimensional array of the planar Yagi-Uda antenna. The new type of the bandpass filter bank is modified to match the requirement of the MIR. The low-cost quadrature demodulator is also developed for the phase detection system. By using the low-price commercial wireless devices, the development cost becomes much lower than the expensive waveguide system. These devices enable the development of 2-D/3-D microwave imaging system for the plasma diagnostics and industrial applications.
authors.affiliation: Faculty of Engineering Science, Kansai University, Osaka 564-8680, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Yamaguchi
authors.forename: Y
authors.initials: Y
authors.lastname: Nagayama
authors.forename: D
authors.initials: D
authors.lastname: Kuwahara
authors.forename: T
authors.initials: T
authors.lastname: Yoshinaga
authors.forename: Z B
authors.initials: ZB
authors.lastname: Shi
authors.forename: Y
authors.initials: Y
authors.lastname: Kogi
authors.forename: A
authors.initials: A
authors.lastname: Mase