Analysis of a metal disc-shaped terahertz surface wave splitter with a center rod

Abstract

We have proposed a metal disc-shaped terahertz surface wave splitter with a center hole and radially placed gratings. Unfortunately, appreciable reflected waves have been observed from the input port of the center hole. To reduce the reflected waves, we insert a metal rod with a tapered end into the center hole of the disc-shaped splitter operating at two frequencies. It is found that the reflected power is reduced from 77 to 10% at 1.0 THz, and from 23 to 18% at 1.5 THz.