The Design of Ultra-broadband Gap Waveguide Structure for Terahertz Wave Transmission

with the rapid development of terahertz(THz) technology, the broadband THz transmission lines have attracted much attention.In this work,we present an ultra-broadband gap wave guide structure,which can support THz wave from 0.11 THz to 0.22 THz with low-loss transmission characteristic.In order to connect with rectangular waveguide, a transition structure based on the ridge waveguide has been involved and designed. Agreed well with the simulation results, the experiment results show that insertion loss and return loss are better than 1.5dB and 15dB in the frequency band ranging from 0.11THz to 0.22THz, respectively.The design of the broadband gap waveguide here will have important potential application for THz devices and THz application systems.