El Ansari Abdelaaziz, Das Sudipta, Islam Tanvir, Samudrala Varakumari, Soliman Naglaa F, Algarni Abeer D, Amrani El Idrissi Najiba El
Signal, System and Component Laboratory, Sidi Mohamed Ben Abdellah University - FST, Fez, 30000, Morocco.
Department of Electronics & Communication Engineering, IMPS College of Engineering and Technology, Malda, 732103, WB, India.
Heliyon. 2024 Sep 7;10(18):e37575. doi: 10.1016/j.heliyon.2024.e37575. eCollection 2024 Sep 30.
A graphene-based 1 × 2 array antenna with circular polarization for terahertz applications is prescribed in this article. Initially, a novel concept of a folded quarter wave impedance transformer is utilized in the design process of a single element for minimizing the overall antenna size. The opposite corners of the patches have been truncated and structural modifications are performed with the insertion of four flower-shaped slots along with an additional circular slot for achieving a much-improved reflection coefficient and better impedance bandwidth. It also shows a much wider 3 dB axial ratio bandwidth, confirming circular polarization due to the suggested modifications in its geometry. Then, an array antenna has been formed to provide better gain. The configured patches are fed by a magic-T power divider to attain the required impedance matching. The results of the CP antenna array have been analyzed using the HFSS and CST simulators. The propounded 1 × 2 array antenna shows circular polarization with a 3 dB AR bandwidth of 205 GHz (2.345-2.55 THz) and wide spectral coverage of 210 GHz (2.345 2.555 THz) along with a maximum gain of 8.65 dB and 99.8 % radiation efficiency with a total size of 53.5 × 102 × 1.56 μm. It could be utilized for high-speed data transmission, material characterization, terahertz spectroscopy, terahertz imaging, etc. applications.
本文介绍了一种用于太赫兹应用的具有圆极化特性的基于石墨烯的1×2阵列天线。首先，在单个元件的设计过程中采用了一种新型的折叠四分之一波长阻抗变压器概念，以最小化天线的整体尺寸。对阵列单元的对角进行了截断，并通过插入四个花形槽以及一个额外的圆形槽进行结构修改，以实现显著改善的反射系数和更好的阻抗带宽。由于其几何结构的改进，该天线还展示了更宽的3dB轴比带宽，证实了圆极化特性。然后，形成了一个阵列天线以提供更好的增益。通过一个魔T功率分配器对阵列单元进行馈电，以实现所需的阻抗匹配。使用HFSS和CST模拟器对圆极化天线阵列的结果进行了分析。所提出的1×2阵列天线呈现出圆极化特性，3dB轴比带宽为205GHz（2.345 - 2.55THz），频谱覆盖范围为210GHz（2.345 - 2.555THz），最大增益为8.65dB，辐射效率为99.8%，总尺寸为53.5×102×1.56μm。它可用于高速数据传输、材料表征、太赫兹光谱学、太赫兹成像等应用。
