Title :
Investigation of conductivity loss in a helix slow-wave structure due to the backward-wave space-harmonic propagation mode
Author :
Datta, S.K. ; Kumar, Lalit ; Basu, B.N.
Author_Institution :
Microwave Tube R&D Centre, Bangalore, India
Abstract :
Closed form expression for the inductance per unit length of the transmission-line equivalent circuit of a helical slow-wave structure was derived incorporating the effects of space-harmonic propagating modes and surface current density on the helix over the actual metallic area of the tape. This expression was used for estimating the conductivity loss in the structure following Wheeler´s incremental inductance rule. Some interesting characteristics that were observed on the conductivity loss due to the backward-wave space-harmonic mode are reported.
Keywords :
current density; equivalent circuits; inductance; microwave tubes; slow wave structures; transmission line theory; Wheeler incremental inductance rule; backward-wave space-harmonic propagation mode; conductivity loss; helix slow-wave structure; helix traveling-wave tube; inductance per unit length; surface current density; transmission-line equivalent circuit; Attenuation; Conductivity; Current density; Equivalent circuits; Inductance; Magnetic analysis; Microwave propagation; Propagation constant; Propagation losses; Transmission lines; Backward-wave; Circuit attenuation; Circuit loss; Conductivity loss; Helix slow-wave structure (SWS); Helix traveling-wave tube (TWT); Space-harmonic; Wheeler´s incremental inductance rule;
Conference_Titel :
Vacuum Electronics Conference, 2009. IVEC '09. IEEE International
Conference_Location :
Rome
Print_ISBN :
978-1-4244-3500-5
Electronic_ISBN :
978-1-4244-3501-2
DOI :
10.1109/IVELEC.2009.5193480