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

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 fa...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2018-09, Vol.18 (9), p.3079
Main Authors: Mohyuddin, Wahab, Kim, Dong Hwi, Choi, Hyun Chul, Kim, Kang Wook
Format: Article
Language:English
Subjects:
Antennas
Boundary conditions
Comparative studies
Electromagnetic wave filters
frequency selective surface (FSS)
Frequency selective surfaces
imaging diagnostics systems
large-size FSS
Millimeter waves
millimeter-wave
Notch filters
Receivers & amplifiers
Resonant frequencies
Satellite communications
Sensors
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Summary: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.
ISSN:1424-8220
1424-8220
DOI:10.3390/s18093079