Analysis of the photonic bandgaps for gyrotron devices

Yanyan Zhang, Sheng Yu, Liang Zhang, Tianzhong Zhang, Youwei Yang, Hongfu Li

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Abstract

The global bandgaps of photonic crystal are theoretically analyzed in this paper. The electromagnetic-wave propagation characteristics of photonic bandgap (PBG) structures, which is used in the the millimeter-wave, submillimeter-wave, and terahertz regime vacuum electronic devices and accelerators, were numerically simulated using the finite-element method software high-frequency structural simulator. The dispersion curves of the lattices in different rod radius to-rod spacing ratios and the global bandgaps for the general 2-D PBG structures formed by triangular and square arrays of metal rods were simulated. A mode map that shows the relationship between the structures and the contained modes was plotted and a 220-GHz metallic PBG resonator operating in TE _{math\rm {math\bf {04}}} mode was designed for a gyrotron device to verify the theoretical and numerical simulations, and a comparison of mode density and quality factor between the PBG resonator and the equivalent cylindrical resonator has been carried out.
Original languageEnglish
Pages (from-to)1018-1023
Number of pages6
JournalIEEE Transactions on Plasma Science
Volume43
Issue number4
Early online date6 Apr 2015
DOIs
Publication statusPublished - 13 Apr 2015

Keywords

  • cavity resonator
  • gyro-devices
  • photonic bandgap (PBG)
  • square lattice
  • triangular lattice

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