The traditional frequency selective surface (FSS) needs further improvement with the development of stealth technology, and the design of multifunctional FSSs is essential. In this letter, an active absorptive FSS (AFSS) has been designed based on the absorption structure of the spoof surface plasmon polariton (SSPP) and the switching activity of the active FSS. The active FSS embedded with PIN diodes realizes the shift of two transmission/reflection frequency bands by controlling the bias voltage of the feed network, which switches from one band-pass response (at around 3.06 GHz) to the other (at around 4.34 GHz). And when one of the transmission windows switches to the other, the original transmission window closes. The upper plasmonic structure achieves a continuous and efficient absorption band from 6.31 to 8.34 GHz. A sample was also fabricated and carried out to verify the numerical simulation, and the experimental and simulation results are consistent. This work provides new ideas for the design of active AFSS and promotes its application in common aperture radome, antenna isolation, and electromagnetic shielding.

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We proposed a composite strategy that integrates the mechanism of a frequency selective surface (FSS) and a coding metasurface to achieve low-frequency transmission and high-frequency diffusion, so called electromagnetic (EM) transmission–diffusion integration. A double-layered metasurface consisting of a bandpass FSS and one-bit chessboard coding metasurface is proposed and fabricated for the EM functionality of transmission–diffusion. The numerical and measured results are in good agreement indicating that high-efficiency transmission and diffusion can be simultaneously achieved in the frequency bands of 4.9–6.3 GHz and 10–35 GHz, respectively. Simultaneously, the application of the proposed structure on the curved surface is verified by simulation, and transmission–diffusion performance is also obtained. Encouragingly, the proposed metasurface provides a novel approach for obtaining a wideband transmission window and diffusion within a single metasurface, which may find potential applications in the fields of integrated EM systems and stealthy radomes.

Multidimensionally (amplitude, polarization, and phase) manipulated metasurfaces have drawn more significant advantages in modern photonic applications. In this paper, the active multidimensionally manipulated metasurface merging Pancharatnam–Berry phase and dynamic phase is proposed. The phase and polarization of the coding elements here can be adjusted dynamically by utilizing positive‐intrinsic‐negative (PIN) diodes. More remarkably, the independent feeding of the coding elements in two layers is creatively proposed so that each coding element of the active coding metasurface (ACM) has four basic response states. And the four states can be dynamically switched by regulating the bias voltages imposed on the PIN diodes through field programmable gate array (FPGA). Therefore, the versatile functionalities of the ACM are achieved and all the functionalities can be implemented in real‐time. As a proof of concept, three specific functionalities are validated both from the simulation and measurement on a fabricated prototype with good coincidence with each other. The ACM can achieve copolarization, crosspolarization anomalous reflection, and circular‐linear polarization conversion for the incident circularly polarized wave. The proposed ACM opens new vistas in active metadevices and has broad application prospects in multifunctional devices and communication systems.