X-Band Bandpass Frequency Selective Surface Based on a New Biosourced Substrate of Natural Flax Fiber For Radome Application

This article presents a biosourced band-pass Frequency Selective Surface (FSS) with wideband frequency response. The single-layer designed FSS is made of a simple miniaturized elements unit cell and a new biocomposite substrate. The bio-based substrate of the natural flax fibers and compatible resin is developed using the vacuum infusion manufacturing process, and its dielectric properties were obtained by microwave characterization using the free-space measurement method over a wide frequency range. The FSS exhibit a stable frequency response to different angles of incidence and polarizations. Simulation and measurement results are in good agreement and show that the structure occurs a bandwidth of 1.95 GHz ranging between 9.3 GHz and 11.25 GHz with a fractional bandwidth of 19%.