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In this paper, we propose low-loss and broadband terahertz (THz) waveguide-to-coupled microstrip transitions using dipole antenna with directors. The simulation and measurement show that insertion/return loss and bandwidth of the waveguide transition can be improved by adding two directors to the basic dipole antenna. The fabricated transition with two directors on a 50μm-thick quartz substrate exhibits a back-to-back insertion loss of 1.5 dB and return loss better than 15.0 dB across full Hband (220–325GHz). This belongs to the excellent performance compared with the reported H-band waveguide transitions using dipole antenna.

Full H-band waveguide-to-coupled microstrip transition using dipole antenna with directors