Polarization selection characteristics of carbon fiber orientation and interweaving for electromagnetic interference shielding behaviors

Abstract

In this paper, to determine the impact of carbon fiber orientation and interweaving on electromagnetic interference (EMI) shielding behaviors, anisotropic and isotropic samples were developed by conductive/dielectric weaving of spatially distributed carbon fiber and glass fiber. Effortless and cost-effective, the electromagnetic shielding efficiency (SE) was up to 42 dB and the SE/thickness) was 41 dB/mm, which had apparent polarization selection characteristics. In addition, the angle (θ) sensitivity for the SE in transverse electric and transverse magnetic polarization modes was given in detail. SE was generally proportional to θ. Moreover, the fingerprint-like radar chart of anisotropic carbon hybrid woven fabrics in the X-band was performed, which makes polarization selection characteristics more intuitive. This paper presented an easy and effective route for assembling hybrid carbon fiber fabrics with high EMI shielding performance, which offers a clear perspective on the simulation and study of carbon fiber electromagnetic properties.

Anisotropic Shape Memory Composite for Dynamically Adjustable Electromagnetic Interference Shielding

“…The appearance of the SE T peak at 8.78 GHz could be ascribed to the resonance absorption of electromagnetic waves by interference cancellation. 33,34 After rotation of the test angle to the vertical direction (90°), the SE T value of the composite decreases to 5.8−8.1 dB, which means that the shielding efficiency of the GFF/EVA composites decreases from over 99.992% in the 0°direction to 73.697% in the 90°direction. In comparison to the commercial electromagnetic shielding materials with nonadjustable shielding efficiency (constantly over 99%), the GFF/EVA composite showed tunable electromagnetic shielding effect (range from 73.697 to 99.992%), which can be modulated by simple operation of rotation.…”