Abstract

In this paper, a novel technology based on the addition of air through-hole structures (ATSs) is proposed to optimize the performance of polarization conversion. Based on the tree-shaped resonator (patch), the working band can be moved and widened by adding the ATS with a certain radius. Among them, in terms of a theorem, angular stability, parameters, and so on, the detailed analysis of the metasurface whose ATS radius is 5 µm is presented. Apart from this, to highlight the superiority and the role of the ATS, the metasurface without ATS is also discussed identically as above. To be specific, due to the addition of ATS, the two original narrowbands, which are operating at 0.725–1.013 THz and 1.225–1.423 THz (polarization conversion rate ${\gt}{90}\%$), are widened into a complete broadband (0.90–1.86 THz). In this case, the metasurface with ATS possesses a relative bandwidth of 69.6%. When the linearly polarized wave is irradiated vertically on the metasurface, the electric field orientation of the wave is converted by 90° from the $x$ axis to the $y$ axis. Therefore, the metasurface holds promising applications in radar, communications, and so on.

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