Zhang Yang'an, Li Yuxi, Li Yao, Yuan Xueguang, Yan Xin, Zhang Xia
The State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China.
Sensors (Basel). 2024 Aug 4;24(15):5044. doi: 10.3390/s24155044.
A graphene-based tunable polarization conversion metasurface (PCM) was designed and analyzed for the purpose of reducing the radar cross-section (RCS) of array antennas. The metasurface comprises periodic shuttle-shaped metal patches, square-patterned graphene, and inclined grating-patterned graphene. By adjusting the Fermi energy levels of the upper () and lower () graphene layers, different states were achieved. In State 1, with = 0 eV and = 0.5 eV, the polarization conversion ratio (PCR) exceeded 0.9 in the bandwidths of 1.65-2.19 THz and 2.29-2.45 THz. In State 2, with = = 0.5 eV, the PCR was greater than 0.9 in the 1.23-1.85 THz and 2.24-2.60 THz bands. In State 3, with = = 1 eV, the PCR exceeded 0.9 in the 2.56-2.75 THz and 3.73-4.05 THz bands. By integrating the PCM with the array antenna, tunable RCS reduction was obtained without affecting the basic radiation functionality of the antenna. In State 1, RCS reduction was greater than 10 dB in the 1.60-2.43 THz and 3.63-3.72 THz frequency ranges. In State 2, the RCS reduction exceeded 10 dB in the 2.07-2.53 THz, 2.78-2.98 THz, and 3.70-3.81 THz bands. In State 3, RCS reduction was greater than 10 dB in the 1.32-1.43 THz, 2.51-2.76 THz, and 3.76-4.13 THz frequency ranges. This polarization conversion metasurface shows significant potential for applications in switchable and tunable antenna RCS reduction.
为了降低阵列天线的雷达散射截面（RCS），设计并分析了一种基于石墨烯的可调谐极化转换超表面（PCM）。该超表面由周期性的梭形金属贴片、方形图案的石墨烯和倾斜光栅图案的石墨烯组成。通过调整上下石墨烯层的费米能级，实现了不同的状态。在状态1中，当 = 0 eV且 = 0.5 eV时，在1.65 - 2.19 THz和2.29 - 2.45 THz带宽内，极化转换率（PCR）超过0.9。在状态2中，当 = = 0.5 eV时，在1.23 - 1.85 THz和2.24 - 2.60 THz频段内，PCR大于0.9。在状态3中，当 = = 1 eV时，在2.56 - 2.75 THz和3.73 - 4.05 THz频段内，PCR超过0.9。通过将PCM与阵列天线集成，在不影响天线基本辐射功能的情况下实现了可调谐的RCS降低。在状态1中，在1.60 - 2.43 THz和3.63 - 3.72 THz频率范围内，RCS降低大于10 dB。在状态2中，在2.07 - 2.53 THz、2.78 - 2.98 THz和3.70 - 3.81 THz频段内，RCS降低超过10 dB。在状态3中，在1.32 - 1.43 THz、2.51 - 2.76 THz和3.76 - 4.13 THz频率范围内，RCS降低大于10 dB。这种极化转换超表面在可切换和可调谐天线RCS降低应用中显示出巨大潜力。
