Frequency selective surface applications in millimeter wave imaging diagnostics for fusion plasmas

2015 ◽  
Author(s):  
Xing Hu ◽  
C. W. Domier ◽  
N. C. Luhmann
Keyword(s):  
Millimeter Wave ◽  
Frequency Selective Surface ◽  
Fusion Plasmas ◽  
Imaging Diagnostics ◽  
Millimeter Wave Imaging ◽  
Wave Imaging ◽  
Frequency Selective

scholarly journals Passive Frequency Selective Surface Array as a Diffuser for Destroying Millimeter Wave Coherence

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Saiful Islam ◽  
Johan Stiens ◽  
Gert Poesen ◽  
Irina Jaeger ◽  
Roger Vounckx
Keyword(s):  
Millimeter Wave ◽  
Random Phase ◽  
Frequency Selective Surface ◽  
Critical Parameters ◽  
Etching Technique ◽  
Millimeter Wave Imaging ◽  
Deterministic Function ◽  
Wave Imaging ◽  
Finite Integral ◽  
Frequency Selective

This paper presents the design, construction, and testing of grounded frequency selective surface (FSS) array as a diffuser for destroying millimeter wave coherence which is used to eliminate speckle in active millimeter wave imaging. To create stochastically independent illumination patterns, we proposed a diffuser based on random-phase distributions obtained by changing the incident frequency. The random-phase diffuser was obtained by mixing up the phase relations between the cells of a deterministic function (e.g., beam splitter). The slot length of FSS is the main design parameter used to optimize the phase shifting properties of the array. The critical parameters of the diffuser array design, such as phase relation with slot lengths, losses, and bandwidth, are discussed. We designed the FSS arrays with finite integral technique (FIT), fabricated by etching technique, and characterized theS-parameters with a free-space MVNA, and measured the radiation patterns with a BWO in motorized setup.

Millimeter-wave imaging diagnostics systems on the EAST tokamak (invited)

2016 ◽  
Vol 87 (11) ◽  
pp. 11D901 ◽  
Author(s):  
Y. L. Zhu ◽  
J. L. Xie ◽  
C. X. Yu ◽  
Z. L. Zhao ◽  
B. X. Gao ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Imaging Diagnostics ◽  
Millimeter Wave Imaging ◽  
Wave Imaging

Progress in Millimeter-Wave Imaging Diagnostics

2003 ◽  
Vol 43 (1T) ◽  
pp. 237-242 ◽  
Author(s):  
A. Mase ◽  
Y. Kogi ◽  
K. Kawahata ◽  
Y. Nagayama ◽  
N. C. Luhmann ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Imaging Diagnostics ◽  
Millimeter Wave Imaging ◽  
Wave Imaging

System-on-chip upgrade of millimeter-wave imaging diagnostics for fusion plasma

2021 ◽  
Vol 92 (5) ◽  
pp. 053522
Author(s):  
Y. Zhu ◽  
J.-H. Yu ◽  
G. Yu ◽  
Y. Ye ◽  
Y. Chen ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
System On Chip ◽  
Fusion Plasma ◽  
Imaging Diagnostics ◽  
Millimeter Wave Imaging ◽  
Wave Imaging ◽  
On Chip

scholarly journals Comparative Study of Square and Circular Loop Frequency Selective Surfaces for Millimeter-Wave Imaging Diagnostics Systems

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 3079 ◽  
Author(s):  
Wahab Mohyuddin ◽  
Dong Kim ◽  
Hyun Choi ◽  
Kang Kim
Keyword(s):  
Design Method ◽  
Cell Structure ◽  
Frequency Selective Surface ◽  
Pass Band ◽  
Circular Loop ◽  
Millimeter Wave Imaging ◽  
Wave Imaging ◽  
Design Values ◽  
Fabrication Tolerances ◽  
Frequency Selective

A design method of large-sized square-loop and circular-loop frequency selective surface (FSS) filters for protection of mm-wave imagining receivers is presented. Due to fine cell structure requirements, the performance of the FSS structures at mm-wave frequencies can be significantly affected by fabrication tolerances, especially involved with large-size panel fabrication. Through a comprehensive parametric variation study on the performance of square-loop and circular-loop FSS structures, it is found that the circular-loop FSS structure performs much less sensitively to the fabrication tolerances, thereby producing better and consistent performances with given design values. As a design example, square-loop and circular-loop notch filters resonating at 105 GHz were designed and the performances were evaluated with multiple prototypes. The resonant frequencies of the implemented circular-loop FSS filters deviated by only about 0.5 GHz from the accurate designed value, which can be easily adjusted in the design process. The implemented square-loop and circular loop FSS filters provided low-loss in the pass-band and high rejection of 23 dB at the resonant frequency with good oblique angle performance.

scholarly journals Millimeter-wave imaging of magnetic fusion plasmas: technology innovations advancing physics understanding

2017 ◽  
Vol 57 (7) ◽  
pp. 072007 ◽  
Author(s):  
Y. Wang ◽  
B. Tobias ◽  
Y.-T. Chang ◽  
J.-H. Yu ◽  
M. Li ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Magnetic Fusion ◽  
Fusion Plasmas ◽  
Millimeter Wave Imaging ◽  
Technology Innovations ◽  
Wave Imaging
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