Performance of a Nano-CNC Machined 220-GHz Traveling Wave Tube Amplifier

Design, Fabrication, and Cold Test of a High Frequency System for an H-Band Sheet Beam Travelling Wave Tube

“…A 31.8 kV, 0.2 A SEB with a transverse size of 0.6 mm×0.08 mm was injected into port 3 of the HFS with dielectric attenuators. The corresponding electron beam current density was ~416.7 A/cm 2 , which could be provided by nanocomposite scandate tungsten cathodes [3]. The filling factor of the electron beam was 58.8%.…”

“…One of the most significant factors is the lack of terahertz power amplifiers with moderate radiation power and wide bandwidth, thereby resulting in the expression "THz gap". The sheet beam travelling wave tube (SB-TWT) is a kind of competitive device that is helpful to fill the gap due to the high radiation power and broad bandwidth [3]- [6]. Compared with the pencil electron beam, the sheet electron beam (SEB) is advantageous as it could carry higher electron beam current by enlarging the lateral dimensions of the SEB [7]- [10].…”

“…A machining tolerance with a few microns, a surface roughness with hundreds of nanometers and a small assembling error are typically required in the fabrication of the HFS in a terahertz band SB-TWT. Considerable efforts have been made for the fabrication of the micro-structures in a terahertz vacuum electron device, such as the nano-computer numerical control (CNC) milling techniques [3], [15], [24]- [25], LIGA (German acronym for lithography, electroplating, and molding) process techniques [13], [26], deep-reactive ion etching (DRIE) techniques [26], wire cutting techniques [10], [27], and the 3D-printed mold electroforming [28].…”

Demonstration of a Planar ${{W}}$ -Band, kW-Level Extended Interaction Oscillator Based on a Pseudospark-Sourced Sheet Electron Beam

“…The measured radiation power has been increased to ~200 W after a post-acceleration of the pencil PS-EB was introduced in the pseudospark discharge system [9]. To further enhance the radiation power, this letter proposes to study the EIO using a pseudospark-sourced sheet electron beam (PS-SEB), exploiting the high beam current density of a PS-EB and the large cross sectional area of the sheet electron beam [12]. Furthermore the increased beam current was used to drive a resonant interaction circuit with a high characteristic impedance (R/Q) to generate high radiation power.…”

Survey of Researches and Developments on Terahertz Wireless Communications

“…8Gbit/s の 伝 送 に つ い て 発 表 さ れ た (5) ．その後， 240GHz で 100 Gbit/s (6) ， 300GHz 帯で 48 Gbit/s (7) の伝送速度が実現されている．更に，最近では 1THz での無線通信についても報告されている (8) (16) ．更に，RTD を用いた 500 GHz 帯の無線送受 信によって伝送速度 34 Gbit/s が達成されている (17) ． 海外では欧州 HORIZON2020 の iBrow プロジェク ト(2015-2017) ( (21) ，1THz 帯 で 29mW (22)…”