In this article, the first 237 GHz traveling wave tube (TWT) is presented as a high-power amplifier for terahertz (THz) cloud radar. As common with previous G-band tubes developed at Beijing Vacuum Electronics Research Institute, employs 20 kV, 50 mA pencil electron beam focused using periodic permanent magnets (PPMs) to achieve compactness. A folded waveguide (FWG) slow-wave structure (SWS) mo...

A novel power amplifier unit for a phased array radar with 2 × output ports vacuum electron device is proposed. Double parallel connecting microstrip meander-lines are employed as the slow-wave circuits of large traveling wave tube operate in Ka-band. The high frequency characteristics, transmission and beam–wave interaction processes this simulated optimized. For each port one channel, simulat...

in this work, we successfully construct the new exact traveling wave solutions ofthe generalized sinh–gordon equation by new application of the homogeneousbalance method. the idea introduced in this paper can be applied to othernonlinear evolution equations.

In this study, we aim to construct a traveling wave solution for nonlinear partial differential equations. In this regards, a cosine-function method is used to find and generate the exact solutions for three different types of nonlinear partial differential equations such as general regularized long wave equation (GRLW), general Korteweg-de Vries equation (GKDV) and general equal width wave equ...

In this paper we present an intuitive explanation for the non-uniqueness of the traveling wave speed in the Fisher equation, showing a similar non-uniqueness property in the case of inviscid traveling waves. More precisely, we prove that traveling waves of the Fisher equation with wave speed c > 0 converges to the inviscid traveling wave with speed c > 0 as the diffusion vanishes. A complete di...

The principle of the traveling wave based differential protection for bipolar HVDC transmission lines is proposed in the paper. Unlike the traditional current differential protection, the quantity of current is replaced by the quantity of the traveling wave for comparison. The traveling wave at the remote end is transferred to the local end for comparison to the local traveling wave. For the bi...

Squeezing of the electromagnetic vacuum is an essential metrological technique used to reduce quantum noise in applications spanning gravitational wave detection, biological microscopy, and information science. In superconducting circuits, resonator-based Josephson-junction parametric amplifiers conventionally generate squeezed microwaves are constrained by a narrow bandwidth low dynamic range....