Journal ArticleDOI
Sine Waveguide for 0.22-THz Traveling-Wave Tube
TLDR
In this paper, a novel slow-wave structure called sine waveguide has been proposed to develop a wideband high-power terahertz radiation source, which evolves from a rectangular waveguide oscillating with sinusoid along its longitudinal direction.Abstract:
A novel slow-wave structure called sine waveguide has been proposed to develop a wideband high-power terahertz radiation source. The sine waveguide evolves from a rectangular waveguide oscillating with sinusoid along its longitudinal direction. This letter reports the electromagnetic characteristics of the sine waveguide and its effective surface plasmon amplification mechanism. From our calculation, this circuit structure possesses low ohmic losses and reflection and can be applied to produce terahertz waves ranging from 0.2 to 0.25 THz with several hundreds of watts. Moreover, the maximum gain and interaction efficiency may reach 37.7 dB and 9.6%, respectively.read more
Citations
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Journal ArticleDOI
Performance of a Nano-CNC Machined 220-GHz Traveling Wave Tube Amplifier
Anisullah Baig,Diana Gamzina,Takuji Kimura,John Atkinson,Calvin Domier,Branko Popovic,Logan Himes,Robert Barchfeld,Mark Field,Neville C. Luhmann +9 more
TL;DR: In this article, the authors report on hot test measurements of a wide-bandwidth, 220-GHz sheet beam traveling wave tube amplifier developed under the Defense advanced research projects agency (DARPA) HiFIVE program.
Journal ArticleDOI
Millimeter wave traveling wave tubes for the 21st Century
TL;DR: In this paper, traveling wave tubes are rapidly evolving to provide unprecedented power level in comparison to solid state devices in the millimeter wave region of the spectrum (80-300 GHz) thus enabling a wide range of applications.
Journal ArticleDOI
A watt-class 1-THz backward-wave oscillator based on sine waveguide
TL;DR: In this paper, a backward wave oscillator was proposed by utilizing a concise sine waveguide slow-wave structure combined with sheet electron beam to operate at terahertz frequency band.
Journal ArticleDOI
Double Corrugated Waveguide for G-Band Traveling Wave Tubes
TL;DR: In this paper, a novel wide-band traveling wave tube (TWT) based on the double-corrugated waveguide (DCW) is proposed for operating in IEEE G-band (110-300 GHz).
Journal ArticleDOI
Nanoscale Surface Roughness Effects on THz Vacuum Electron Device Performance
Diana Gamzina,Hanyan Li,Logan Himes,Robert Barchfeld,Branko Popovic,Pan Pan,Rosa Letizia,Mauro Mineo,Jinjun Feng,Claudio Paoloni,Neville C. Luhmann +10 more
TL;DR: In this article, the surface roughness of metal waveguides has been investigated at the nanoscale using microfabrication techniques, and two significant examples are considered: a 0.346-THz backward wave tube oscillator and an 0.263-thz traveling wave tube.
References
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Journal ArticleDOI
Mimicking Surface Plasmons with Structured Surfaces
TL;DR: It is established that electromagnetic waves in both materials are governed by an effective permittivity of the same plasma form, which allows the creation of designer surface plasmons with almost arbitrary dispersion in frequency and in space.
Journal ArticleDOI
Plasma physics and related challenges of millimeter-wave-to-terahertz and high power microwave generationa)
TL;DR: In this article, the contemporary plasma physics and other related issues of compact, high power mmw-to-THz sources are compared and contrasted to those of classic HPM generation, and future research challenges and opportunities are discussed.
Journal ArticleDOI
Folded waveguide traveling-wave tube sources for terahertz radiation
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TL;DR: In this paper, the authors present feasibility studies of an oscillator concept using an amplifier with delayed feedback, and experimental evaluation of the concept at 50 GHz is presented, where the results of the experiment are in good agreement with the simulations.
Journal ArticleDOI
Accurate parametric modeling of folded waveguide circuits for millimeter-wave traveling wave tubes
John H. Booske,M.C. Converse,Carol L. Kory,Christine T. Chevalier,D.A. Gallagher,K. Kreischer,V.O. Heinen,Sudeep Bhattacharjee +7 more
TL;DR: In this article, the authors compared results of different models for calculating effective, cold-circuit (beam-free) phase velocities and interaction impedances of folded waveguide (FW) slow wave circuits for use in millimeter-wave traveling wave tubes (TWT).
Journal ArticleDOI
Microfabrication of high-frequency vacuum electron devices
TL;DR: The most promising microfabrication techniques applicable to high-frequency RF devices and examples of recent applications are described.
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