Abstract Optically transparent and ultra‐wideband metasurfaces are key enablers for future wireless–optical systems, offering electromagnetic functionality without compromising visible‐light transmission. In this work, a flexible and transparent beam‐steering metasurface is demonstrated, based on a three‐layer fine metal line (FML) network patterned on PET substrates with an interleaved air gap. The metasurface enables linear polarization rotation and broadband phase compensation while achieving high optical transparency (∼70%) and mechanical flexibility. The transmitarray is optimized to steer beams over a broad frequency range from 13 to 32 GHz through passive frequency‐dependent phase dispersion. Simulations and measurements confirm consistent beam deflection from 26° to 9°, with a peak gain of 26.03 dBi and stable aperture efficiency above 40%. Conformal simulations demonstrate that beam‐steering performance is maintained under bending angles up to 20°, with no degradation in optical or electromagnetic functionality. Combining with ultra‐wideband operation, transparency, conformability, and scalable fabrication, the proposed metasurface presents a promising solution for next‐generation transparent antennas, radomes, and smart wireless–photonic platforms.
Lin et al. (Fri,) studied this question.
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