RT - Journal Article T1 - Design of a wideband, high-gain and high-directivity THz Vivaldi antenna JF - opsi YR - 2020 JO - opsi VO - 26 IS - 0 UR - http://opsi.ir/article-1-2189-en.html SP - 1161 EP - 1164 K1 - THz antenna K1 - Vivaldi antenna K1 - wideband antenna K1 - high gain K1 - high directivity. AB - In this paper, a wideband Vivaldi antenna is designed for the frequency range of 0.5-3 THz and simulated by a software package based on the finite element method. The antenna has dimensions of 432µm × 400µm ×10.2µm, its substrate is quartz, and the conducting layers are made of gold. The designed antenna is highly directive; its directivity in the above mentioned frequency range is between the minimum of 4.53 dB and the maximum of 9.40 dB. Also, from simulation results, its maximum gain and efficiency were found to be 8.50 dB and 84.43%, respectively which make it superior to similar antennas reported in the literature. The proposed antenna can be used in THz imaging and spectroscopy to detect materials that have THz signatures in this region. LA eng UL http://opsi.ir/article-1-2189-en.html M3 ER -