Printed frequency selective surfaces (FSS) for EMI shielding in polymer matrix composites

Date

2024-12-24

Author

Altuntop Ersan, Tuğçe

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Frequency selective surfaces (FSS), periodic metallic patterns on radiotransparent materials, are used to decrease radar cross section (RCS) of a radiating structure by allowing the transmittance of a signal at the desired frequency band. This study investigates the methodology and application of frequency selective surfaces (FSS) to be used in structural polymer matrix composites to provide electromagnetic interference (EMI) shielding in desired electromagnetic (EM) bands. Motivation of this work comes from the increased use of FSS layers in structural radome applications and the deficits of generally used manufacturing routes. Modelling and processing of suitable FSS patterns on glass fiber woven fabric surface with proper conductive paste materials by screen-printing method is the main research interest of this work to provide both structural characteristic and selective transmittance properties to multilayer radome composites. In the scope of this study, FSS design to provide desired EM performance, printing techniques of conductive patterns on fiber woven fabric materials, surface treatment of glass fiber and printed conductive paste surfaces, manufacturing of multilayered thermoset matrix composites and composite characterizations have been investigated for a generic FSS design. Microstructural characterization in pattern level, electrical characterization in both fabric level and composite level as well as mechanical characterization in composite level have been performed. Target performance of the FSS composite material was determined as minimum -10 dB reflection loss and -2 dB insertion loss in 8-9 GHz frequency range. In conclusion, a selectively transmitting multilayer FSS composite material containing the modeled, validated and screen-printed conductive FSS pattern with selected conductive paste material showing the target performance has been demonstrated.

Subject Keywords

Frequency selective surface (FSS), Electromagnetic functionalized fabric, Electromagnetic interference (EMI) shielding, Polymer matrix composites

URI

https://hdl.handle.net/11511/113038

Collections

Graduate School of Natural and Applied Sciences, Thesis