As the most widely used band in wireless communication systems, S-band is often used in many military and civil fields. In this paper, with the aid of the reconfigurability realized by the solid state plasma (SSP), a tunable metamaterial-based polarization converter is proposed and theoretically investigated. Through the premeditated excitation of the SSP resonators in the specific region, the linear-to-circular polarization conversions with two different operating states can be realized and switched to each other. The numerical results show that the polarization converter can obtain circularly polarized waves in two separate bands (2.15–2.63 GHz and 3.18–3.71 GHz) when our design is in State I, and the dual operating bands expands and merges into a consecutive ultra-wideband range (2.04–3.67 GHz) when our design is switched to State II. The total tunable working range of the presented polarization converter can essentially cover the whole S-band and the phenomenon of the isolation and fusion of the operating band possesses great potential application value in the fields of radar radomes, polarization separation, electromagnetic shielding, and so on.

作为无线通信系统中使用最广泛的频带，S频带经常用于许多军事和民用领域。在本文中，借助固态等离子体（SSP）实现的可重构性，提出了可调谐的基于超材料的极化转换器，并进行了理论研究。通过在特定区域对SSP谐振器进行预激励，可以实现具有两种不同工作状态的线性到圆偏振转换，并且可以相互转换。数值结果表明，当我们的设计处于状态I时，偏振转换器可以在两个单独的频带（2.15-2.63 GHz和3.18-3.71 GHz）中获得圆偏振波当我们的设计切换到状态II时，双工作频带将扩展并合并为连续的超宽带范围（2.04–3.67 GHz）。所提出的极化转换器的总可调工作范围基本上可以覆盖整个S波段，并且工作频带的隔离和融合现象在雷达天线罩，极化分离，电磁屏蔽等领域具有巨大的潜在应用价值。在。