In this paper, the behavior of radiation including the reconfiguration capability of planar metallic antenna structure using graphene in the microwave (MW) and terahertz (THz) frequency range is investigated. Different from the conventional reconfigurable metal planar antenna and graphene plasmonic THz antenna designs, this planar microstrip metal antenna structure is realized by placing a graphene layer in between the copper radiator and silicon dielectric. The design is inspired by the tunable conductivity behavior of graphene that can be achieved by applying a DC bias voltage across it. The antenna performance parameters such as frequency reconfiguration, VSWR, input impedance, efficiency, and radiation pattern are studied in both MW and THz frequencies. The radiation properties of the proposed antenna are studied at both MW and THz spectra by tuning the graphene conductivity via Fermi energy. It is found that, at MW and THz frequency, with respect to the unbiased condition, the antenna radiation efficiency is enhanced from 16% to 66% and from 26% to 69%, respectively, with the increase of Fermi energy from 0.5 eV to 0.8 eV. The efficiency of the antenna at both MW and THz can be further improved with the rise of the Fermi level of graphene. Moreover, the graphene based planar metal antenna structure provides easy frequency reconfiguration in the THz band due to its unique electronic and plasmonic properties at this frequency range, whereas, the presence of the graphene parasitic layer below metal radiator improves the impedance matching and radiation of the antenna at MW band.

本文研究了在微波（MW）和太赫兹（THz）频率范围内辐射行为，包括使用石墨烯对平面金属天线结构的重构能力。与传统的可重构金属平面天线和石墨烯等离子太赫兹天线设计不同，这种平面微带金属天线结构是通过在铜辐射体和硅电介质之间放置石墨烯层来实现的。该设计的灵感来自石墨烯的可调节电导特性，可以通过在其两端施加直流偏置电压来实现。研究了在MW和THz频率下的天线性能参数，例如频率重新配置，VSWR，输入阻抗，效率和辐射方向图。通过通过费米能量调整石墨烯的电导率，研究了拟议天线的辐射特性，同时在MW和THz频谱上进行了研究。结果发现，在MW和THz频率下，相对于无偏条件，随着费米能量从0.5 eV增大到20％，天线辐射效率分别从16％提高到66％和从26％提高到69％。 0.8 eV。随着石墨烯费米能级的提高，在微波和太赫兹频率下的天线效率都可以进一步提高。此外，基于石墨烯的平面金属天线结构由于在该频率范围内具有独特的电子和等离子体特性，因此可在THz频带中轻松配置频率，而金属辐射体下方的石墨烯寄生层的存在可改善阻抗匹配和辐射。 MW波段的天线。