爆炸物
太赫兹辐射
天线(收音机)
指向性
光电子学
石墨烯
材料科学
光谱学
探测器
辐射
光学
计算机科学
电信
物理
纳米技术
化学
天文
有机化学
作者
Gurjeevan Singh,Karmjit Singh Sandha,Ankush Kansal
出处
期刊:Micro and nanostructures
日期:2023-07-01
卷期号:179: 207566-207566
被引量:1
标识
DOI:10.1016/j.micrna.2023.207566
摘要
Explosives and contraband drug detection have been a persistent problem for the last few decades and have emerged as one of the numerous crucial issues in public safety and counter-terrorism. Due to the risks to human cells and the inability to detect all forms of explosive materials, traditional detection techniques like x-rays and metal detectors are inadequate to combat these issues. Terahertz imaging and spectroscopy have solved the aforementioned problems because nonionizing radiation is harmless to humans and can also find objects hidden under non-metals. The proposed research work designed multi-layered dual-band graphene antennas for the THz spectroscopy applications utilising uni-layer triple substrate method, i.e., three substrates at the same height w.r.t. ground. The genetic algorithm optimizes a design antenna with 5.59 & 7.71 THz resonant frequencies, lower used to detect TNT explosives and upper ones used to detect melatonin drugs. The optimized antenna has radiation efficiency (%) values of 79.51 & 77.51, S11 parameters of −48.22 & −43.95, VSWR of 1.007 & 1.012 and bandwidths of 145.9 & 148.4 GHz at both resonating frequencies. In terms of antenna's gain (dB) and directivity (dBi), the optimized antennas show better performance with values of 4.65 & 2.97 and 5.87 & 4.07, respectively. The overall results demonstrated that, while being smaller, the optimized antenna outperforms the conventional one.
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