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In this paper, it is proposed to combine multiple plasmon resonances and Fabry–Perot-like resonance to realize broadband transmission polarization conversion metasurface (TPCM). The broadband TPCM was designed using cross-shaped resonators and two metal gratings. It is shown that the multiple plasmon resonances can greatly expand the polarization conversion bandwidth, and the Fabry–Perot-like resonance can greatly improve its efficiency, the efficient broadband TPCM is realized through their combination. The broadband TPCM of different frequency bands can be obtained by changing the structure parameters. A set of parameters were selected for simulation and experiment to verify the design. The simulation results show that the TPCM can convert linearly polarized waves into its cross-polarized waves with 2 dB bandwidth of 8.1–26.8 GHz and the PCR is greater than 98%. As the oblique incident angle is up to 45°, the cross-polarization transmission is still greater than − 2 dB in the frequency range of 17.0–26.4 GHz, greater than − 3 dB in the frequency range of 8.0–15.8 GHz, and the PCR is more than 97%. The experimental results are in good agreement with the simulation results. [ABSTRACT FROM AUTHOR]

In this paper, a broadband polarization conversion metasurface in microwave regime based on cross-shaped resonators was proposed. The simulated results show that the converter can convert linear polarization wave into its cross-polarization wave, 2 dB bandwidth is 11.5–21.8 GHz, and the Polarization Conversion Ratio is greater than 96% in this range. The simulated surface current distributions show that there are three plasmon resonances generated by magnetic resonances and electric resonance, resulting in broadband cross-polarized reflections, and electromagnetic composite resonances in the same direction will inhibit cross-polarization reflection. The proposed converter presents polarization selectivity, which can only convert the y- and x-polarized waves completely. When the incident angles reach 40°, the converter also shows high-efficiency polarization conversion. The experimental results are highly consistent with the simulation ones. This work may have some potential application in polarization-controlled devices, stealth surfaces, antennas and etc. [ABSTRACT FROM AUTHOR]