A 3-D analysis of a microfabricated ladder slow-wave structure for a millimeter-wave traveling-wave tube

Christopher R. Douglas, Ming-Chieh Lin, Peter H. Stoltz, David Smithe, Jae Seung Lee, Hoyoung Song, Seok Hyun Lee

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The design and the analysis of a ladder slow-wave structure (SWS) operating at 50 GHz is presented. A 3-D particle-in-cell (PIC) modeling of a ladder SWS is presented for the first time. Compared with a conventional helix circuit, the ladder SWS provides wide bandwidth, high interaction impedance, and ease of manufacturing at millimeter wavelengths. A small-signal code based on Pierce's theory was developed to determine the dimensions and the small-signal characteristics of the device. Cold- and hot-test simulations were performed using High Frequency Structure Simulator and VORPAL codes. VORPAL, a 3-D PIC simulator that makes use of the conformal finite-difference time-domain method, predicts a small-signal gain of 15 dB and an instantaneous bandwidth of 6% for a 68-period ladder SWS that is driven by a 22-kV and 196-mA electron beam. Dispersion characteristics, large-signal characteristics, and nonlinear-beam dynamics are investigated.

Original languageEnglish
Article number5593212
Pages (from-to)3500-3507
Number of pages8
JournalIEEE Transactions on Electron Devices
Volume57
Issue number12
DOIs
StatePublished - 2010 Dec 1

Fingerprint

Slow wave structures
Traveling wave tubes
Ladders
Millimeter waves
Simulators
Bandwidth
Finite difference time domain method
Electron beams
Wavelength
Networks (circuits)

Keywords

  • Ladder slow-wave structure (SWS)
  • microfabrication
  • millimeter wave
  • slow-wave structure (SWS)
  • traveling-wave tube (TWT)

Cite this

Douglas, Christopher R. ; Lin, Ming-Chieh ; Stoltz, Peter H. ; Smithe, David ; Lee, Jae Seung ; Song, Hoyoung ; Lee, Seok Hyun. / A 3-D analysis of a microfabricated ladder slow-wave structure for a millimeter-wave traveling-wave tube. In: IEEE Transactions on Electron Devices. 2010 ; Vol. 57, No. 12. pp. 3500-3507.
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A 3-D analysis of a microfabricated ladder slow-wave structure for a millimeter-wave traveling-wave tube. / Douglas, Christopher R.; Lin, Ming-Chieh; Stoltz, Peter H.; Smithe, David; Lee, Jae Seung; Song, Hoyoung; Lee, Seok Hyun.

In: IEEE Transactions on Electron Devices, Vol. 57, No. 12, 5593212, 01.12.2010, p. 3500-3507.

Research output: Contribution to journalArticle

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