We experimentally characterize the field confinement properties of various parallel-plate waveguide (PPWG) geometries in the terahertz spectral range. In contrast to infinite-width PPWGs with free-space diffraction along the unshielded direction, finite-width (and also tapered) PPWGs showwell-confined THz fields at the output facet. Both the transverse field component, perpendicular to the insi...

We overview theoretical and experimental results on spatial optical solitons excited in arrays of nonlinear waveguides. First, we briefly summarize the basic properties of the discrete nonlinear Schrödinger (NLS) equation frequently employed to study spatially localized modes in arrays, the so-called discrete solitons. Then, we introduce an improved analytical model that describes a periodic st...

High power applications require an accurate calculation of the losses on overmoded corrugated cylindrical transmission lines. Previous assessments of power loss on these lines have not considered beam polarization or higher order mode effects. This thesis will develop a theory of transmission that includes the effect of linearly polarized higher order modes on power loss in overmoded corrugated...

In pulse GMA(Gas Metal Arc) welding, it is important that welding conditions are changed due to root gap of the groove during ensure quality. The visual sensor and deep learning useful estimate gap. this study, fundamental experiments were carried out images molten pool taken under various gaps. identification using Resnet50. was identified with 8mm accuracy 100%. Moreover, variation from 4mm 8...

A multilayer aperture antenna array in millimeterwaveband is presented this article. The based on glide-symmetric holey gap-waveguide technology combined with E-plane insertion gaps for a low-cost and low-loss design. radiating part of the formed by an 16 antennas, grouped four sets 2 × subarrays configuration. are fed one-to-four corporate feeding network technology. has been manufactured high...