Open AccessDesign of 825 GHz square helix travelling‐wave tube
Author(s) -
Kotiranta M.,
Krozer V.
Publication year - 2013
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2012.4477
Subject(s) - traveling wave tube , square (algebra) , traveling wave , square wave , helix (gastropod) , tube (container) , optics , materials science , physics , engineering , electrical engineering , mathematics , telecommunications , geometry , mathematical analysis , bandwidth (computing) , amplifier , composite material , voltage , geology , snail , paleontology
A helix travelling‐wave tube for 825 GHz has been designed and its broadband amplification performance has been demonstrated with 3D particle‐in‐simulations. The design utilises a helix slow‐wave structure with a square form and input/output couplers based on a transition from the helix to a coplanar waveguide and further to a rectangular waveguide with a through‐substrate post coupler. A simulated small‐signal gain of 18.3 dB with an output power of over 25 dBm at 1 dB compression point and a 3 dB instantaneous bandwidth of 8% have been obtained.