Abstract
This paper presents the design of a log spiral antenna operating at THz frequencies. The antenna was designed and simulated numerically by using the CST software within the frequency range 0.1-3.0 THz. It is found that the antenna is characterized with a wideband impedance matching which extends from 1.0 to 2.8 THz (vertical bar S11 vertical bar < -10 dB)), high directivity with a maximum value Dmax = 5.61 dBi at 2.05 THz, high gain with a peak Gmax = 4.72 dBi at 2.2 THz, and high efficiency with a maximum eta max = 81.5 % at 1.38 THz. With these obtained performances, we estimate that our proposed structure can be a good candidate for THz source applications.