Analysis of Graphene Pythagoras Tree Fractal Antenna with Thin SiO2 Substrate in Terahertz Regime

Zakarya Hafdi, Zinelabiddine Mezache, Jun-Lei Tao, Ghada Guergour
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Abstract

Abstract The Pythagoras Tree Fractal patch is considered on a SiO2 substrate thickness of 1.5 µm to radiate at four frequencies of 4.975THz, 5.38THz, 6.73THz, and 7.61THz with Voltage Standing Wave Ratio (VSWR) ≤ 2. This is a very creative fractal design of a multiband THz antenna, based on a very thin graphene layer, the study proved a value in terms of high radiation efficiency and high gain, at the level of current research we made a comparison study where the design has evidently huge potential regarding applicability for telecommunication technology in the terahertz regime. The demand for high-performance terahertz (THz) antennas has increased significantly in recent years due to their potential applications in various fields such as medical imaging, security screening, and wireless communications. In this paper, the authors present an analysis of a graphene Pythagoras Tree Fractal (GPTF) antenna with a thin SiO2 substrate for THz regime. The GPTF antenna is designed using a fractal geometry approach, which provides multiple resonant frequencies and enhances the overall radiation efficiency. The thin SiO2 substrate is used to reduce the substrate losses and improve the radiation performance of the antenna. The authors use the Finite-Difference Time-Domain (FDTD) software to simulate the performance of the proposed antenna. The results show that the proposed antenna exhibits high gain, low return loss, and wide bandwidth, making it a promising candidate for THz applications.
薄SiO2衬底石墨烯毕达哥拉斯树分形天线在太赫兹波段的分析
在厚度为1.5µm的SiO2衬底上,考虑毕达哥拉斯树分形贴片在4.975THz、5.38THz、6.73THz和7.61THz四个频率下辐射,电压驻波比(VSWR)≤2。这是一个非常有创意的多波段太赫兹天线分形设计,基于非常薄的石墨烯层,该研究证明了在高辐射效率和高增益方面的价值,在目前的研究水平上,我们进行了比较研究,该设计在太赫兹频段的电信技术适用性方面具有明显的巨大潜力。近年来,由于高性能太赫兹(THz)天线在医疗成像、安全检查和无线通信等各个领域的潜在应用,对其的需求大幅增加。在本文中,作者介绍了一种具有薄SiO2衬底的石墨烯毕达哥拉斯树分形(GPTF)天线在太赫兹波段的分析。GPTF天线采用分形几何方法设计,提供了多个谐振频率,提高了整体辐射效率。采用较薄的SiO2衬底可以减少衬底损耗,提高天线的辐射性能。作者利用时域有限差分(FDTD)软件对天线的性能进行了仿真。结果表明,该天线具有高增益、低回波损耗和宽带宽的特点,是太赫兹应用的理想选择。
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