Journal
IEEE ELECTRON DEVICE LETTERS
Volume 29, Issue 11, Pages 1256-1258Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2008.2004635
Keywords
Dispersion relation; lossy dielectric waveguides; modal filter; modal transition
Categories
Funding
- National Science Fund for Distinguished Young Scholars of China [60125104]
- National Science Fund of China [60571039]
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The mode identification principles, mode structures, and propagation characteristics of electromagnetic modes in a metal cylindrical waveguide coated with an inside layer of lossy dielectric have been investigated for gyro-traveling-wave-tube applications. For the first time, the loss-induced modal transition E is revealed, in which the dispersion curves of a pair of nearby modes cross each other, and their mode structures interchange. The relations among the dispersion curves, mode structures, and propagation attenuations are also presented. The distinctive discriminations of propagation properties between different modes enable us to explore many promising applications using lossy dielectric-coated waveguides.
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