AI 中文总结
本研究开发了一款250GHz的石墨烯基半球形透射阵列天线，实现了-87°至87°俯仰、360°方位的广角波束扫描，天线效率68%-80%，可用于超快运动目标跟踪。
AI 中文摘要
本研究拓展了动态可调石墨烯的应用，实现了一款定制化的半球形透射阵列天线，用于250GHz下的广角电子波束扫描和超快运动目标跟踪。该半球形透射阵列天线具有动态可重构的石墨烯基多层结构，包含金辐射贴片、偏置石墨烯扇区、hBN介质层以及中心放置的喇叭馈源。本研究首次建立了适用于半球形透射阵列天线的石墨烯基可重构超表面分析框架，涵盖石墨烯表面电导率建模、电压控制表面阻抗、传输系数以及共形阵列因子分析。此外，本研究还首次开发了该透射阵列天线中期望波束方向与对应石墨烯偏置电压之间的分析与实用映射关系。该透射阵列天线具备出色的三维波束扫描能力，可实现-87度至87度的宽角俯仰扫描以及全360度方位覆盖，天线效率范围为68%至80%，存在10%的损耗。
英文摘要
This work expands the application of dynamically tunable graphene to implement a hemispherical transmitarray antenna tailored for wide-angle electronic beam steering and ultrafast moving-target tracking at 250 GHz. The proposed hemispherical transmitarray antenna features a dynamically reconfigurable graphene-based multilayer configuration consisting of gold radiating patches, biased graphene sectors, hBN dielectric layers, and a centrally positioned hornfeed. The analytical framework of graphene-based reconfigurable metasurfaces including graphene surface-conductivity modeling, voltage-controlled surface impedance, transmission-coefficient, and conformal array-factor analysis, has been established for hemispherical transmitarray antenna for the first time. Moreover, the analytical and practical mapping between desired beam directions and the corresponding graphene bias voltages have been developed for the transmitarray antenna for the first time. Our transmitarray antenna possesses exceptional 3D beamsteering, providing wide-angle elevation scanning from -87 degrees to 87 degrees and full 360-degree azimuthal coverage. It also exhibits an antenna efficiency ranging from 68% to 80% with a 10% degradation.
Comments17 pages, 9 figures
