Document Type

Article

Publication Title

Materials & Design

Abstract

With rapid progress in wireless communication, the need for advanced frequency-selective surfaces (FSSs) that operate efficiently at high frequencies is growing. This study presents sustainable, high-performance FSSs by laminating cellulose nanofiber (CNF) film filters, laser-patterned with millimeter-scale apertures, onto ul tralight cross-linked CNF foams (aerogels). These biogenic FSSs cover a broad frequency range from 60 GHz to 0.51 THz. Added biochar enhances film conductivity, while metal–organic frameworks (MOFs) improve foam dielectric properties and surface area. The resulting foams exhibit near-air permittivity (εr ≈ 1.01) and low loss tangent, confirming their suitability as high-frequency substrates. The patterned CNF films enable tuning of transmission and reflection properties, achieving high signal transmission (>90%) between 60 and 90 GHz and targeted resonance-based attenuation. Multilayered CNF-based stacks of perforated films and foams show enhanced transmission, wider attenuation bands, and improved phase modulation compared to conventional FSS structures. This work highlights the potential of nanostructured, bio-derived cellulose for next-generation FSS devices, particularly for 5G and 6G applications.

DOI

10.1016/j.matdes.2026.115845

Publication Date

4-2026

Language

eng

Rights

open access

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