Plasma and Fusion Research

Volume 14, 3402111 (2019)

Regular Articles

Prototype Phased-Array Patch Loop Antennae for Electron Cyclotron Emission Diagnostics
Masaharu FUKUYAMA, Hiroshi IDEI1), Miu YUNOKI, Ryuichi ASHIDA, Daichi OGATA, Ryuya IKEZOE1) and Takumi ONCHI1)
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan
Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
(Received 9 January 2019 / Accepted 9 April 2019 / Published 19 June 2019)


A two-dimensional (2D) phased-array-antenna (PAA) for electron cyclotron emission is one of the diagnostics for finding the window area of mode conversion from electron cyclotron waves to electron Bernstein wave. Spatial resolution of the reconstructed emission field pattern is improved with a lot of the antenna elements. The study proposes a phased-array patch loop antenna (PAPA) as a promising system to increase the elements of PAA. A 2D image reconstruction of a 6 GHz radio frequency source emission shows that the source position is detected within millimeter range by applying the prototype PAPA. This result indicates that the 2D image reconstruction with multi-element PAPA is feasible.


electron cyclotron emission, phased array antenna, patch antenna, adaptive-array technique

DOI: 10.1585/pfr.14.3402111


  • [1] H.P. Laqua et al., Phys. Rev. Lett. 78, 3467 (1997).
  • [2] H. Idei et al., J. Plasma Fusion Res. Series 8, 1104 (2009).
  • [3] H. Idei et al., J. Instrum. 11, 4, C04010 (2016).
  • [4] K. Mishra et al., Rev. Sci. Instrum. 85, 11E808 (2014).
  • [5] A. Pal et al., IEEE Trans. Antennas Propag. 65, 576 (2017).