RETRACTED: Design and analytical modeling of folded waveguide traveling wave tube

This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). rticle has been retracted at the request of the editors and author. thor has used without acknowledgement part of the PhD thesis by Yap Soon Tan, "Modeling of folded waveguide travelling wave", University of Liverpool, 2007, available from the British Library at http://ethos.bl.uk/ ILS catalogue number: 13826409. Shelfmark: DXN108794. the conditions of submission of a paper for publication is that authors declare explicitly that their work is original and has not appeared in a publication elsewhere. Re-use of any data should be appropriately cited. As such this article represents a severe abuse of the scientific publishing system. The scientific community takes a very strong view on this matter and we apologize to readers of the journal that this was not detected during the submission process. thor deeply regrets this and offers his sincere and unreserved apologies to the readers of the journal, and especially to Dr. Yap S. Tan, author of the above-mentioned thesis.