title: Improvement of THz coupling using a tapered parallel-plate waveguide.
abstract: This paper reports an experimental and simulation study of a tapered parallel-plate waveguide (TPPWG) to improve THz coupling to the plate separation gap. The flat- and round-type TPPWG without any silicon lens is compared to the parallel-plate waveguide (PPWG) with a plano-cylindrical silicon lens. The spectrum amplitudes of the input-side TPPWG and the input- and output-side TPPWG both having a 3 degrees slop angle increased about 56% and 103% at 1 THz when compared to that of the PPWG. Since the input- and output-side TPPWG had almost no impedance mismatch to the propagating THz wave, coupling to the waveguide could be improved twice compared with the PPWG.
authors.affiliation: Division of Electrical and Electronics Engineering, Korea Maritime University, Busan, South Korea.
authors.forename: Sang-Hoon
authors.initials: SH
authors.lastname: Kim
authors.forename: Eui Su
authors.initials: ES
authors.lastname: Lee
authors.forename: Young Bin
authors.initials: YB
authors.lastname: Ji
authors.forename: Tae-In
authors.initials: TI
authors.lastname: Jeon
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008962:Models, Theoretical; D055096:Optical Devices; D012031:Refractometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D055053:Terahertz Radiation; D014159:Transducers