Plasma and Fusion Research

Volume 11, 2405027 (2016)

Regular Articles

Design and Evaluation of Broad-Band High Pass Filter of Metal Perforated Sheets for Microwave Diagnostics
Akira TANI, Hayato TSUCHIYA1), Mayuko KOGA and Yoshio NAGAYAMA1)
Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji 671-2280, Japan
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
(Received 27 November 2015 / Accepted 3 February 2016 / Published 17 March 2016)


This paper reports characteristic evaluations of perforated metal sheet type high pass filters for milli- or microwave by numerical analysis and the guiding principle of designing broad-band high pass filters. The broad-band filters will be used for the microwave plasma diagnostics such as ECE, interferometer and reflectometer. We used 3D-modeling electromagnetic field calculation code to take complex interferences into account. The validity of the numerical analysis is guaranteed by a good agreement between calculated results and measured results. It is found that the frequency characteristic over the cut-off frequency depends on the filter thickness and that a thin filter is desirable for the ideal broad-band frequency filter.


ECE, microwave diagnostics, millimetric-wave, perforated metal sheet, broad-band high pass filter, 3D numerical analysis, Efield

DOI: 10.1585/pfr.11.2405027


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