Fast Design and Cold-Circuit Properties Simulation for the Slow Wave Structure of a 0.14 THz Broadband Folded Waveguide Traveling Wave Tube

Abstract

This article applies an explicit method to the fast structural design for the slow wave circuit of a 0.14 THz broadband folded waveguide traveling wave tube. To valid the primary design, cold-circuit properties, such as dispersion and interaction impedance, were calculated by using both theoretical method and electromagnetic software (CST MWS) simulation. The S parameter S 11 was also calculated by CST MWS with lossy metal being considered. Simulation results show that, the cold pass band is about 70 GHz, and the interaction impedance is about 1 ohm, and indicate that the design method is reasonable for obtaining a 0.14 THz broadband slow wave structure.

Design of a Polarization-Independent Dual-Band Electromagnetically Induced Transparency-Like Metamaterial

“…This shows that the proposed polarization independent dualband EIT-like metamaterial shows a robust performance against the change of the incidence angle. It is remarkable to note here that dual-band slow light effect is more demanding than single-band slow light effect, since it can be employed in multi-frequency filtering, multiband slow-light devices, multi-band phase shifters and in the development of more sensitive sensors [42][43][44][45][46]. The proposed dual-band EIT-like metamaterial has advantages in this respect and due to being polarization invariant it can be employed in applications unrestrictive from the direction of the impinging wave.…”