Notice of Violation of IEEE Publication PrinciplesAnalysis of the dispersion characteristics of Gyro-TWT with axially periodic dielectric and metal loading

Notice of Violation of IEEE Publication Principles

???Analysis of the Dispersion Characteristics of Gyro-TWT with Axially Periodic Dielectric and Metal Loading???
by Wang Hui, Li Hongfu, Luo Yong, Zhang Tingwei, and Li Hao
in the 33rd International Conference on Infrared, Millimeter and Terahertz Waves, (IRMMW-THz), September 2008

After careful and considered review of the content and authorship of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE???s Publication Principles.

This paper copied substantial portions of text from the paper cited below. The original text was copied without attribution (including appropriate references to the original author(s) and/or paper title) and without permission.

Due to the nature of this violation, reasonable effort should be made to remove all past references to this paper, and future references should be made to the following article:

???Modelling of Axially Periodic Circular Waveguide with Combined Dielectric and Metal Loading???
by Vishal Kesari, P K Jain and B N Basu
in the Journal of Physics D: Applied Physics (38) 2005, pp. 3523???3529

An axially periodic dielectric and metal loading structure showed advantage of facility and widening Gyro-TWTpsilas bandwidth by controlling the dispersion of the waveguide. The field matching technique was used to analyse the axially periodic structure and yielded the dispersion relations. The dispersion characteristics was ploted with the help of dispersion equation and Floquetpsilas theorem,and converged results were obtained using numerical approach.It shows that the dielectric disk axial thickness, permittivity and periodicity and disk-hole radius quite effectively shaped the structure dispersion.The disk-hole radius was more effective than the disc-periodicity in controlling the structure dispersion. The thickness or permittivity of dielectric discs controlled the passband freq- encies and hence helped attain operating frequencies of a Gyro-TWT.