Input coupling systems for millimetre‐wave gyrotron travelling wave amplifiers. Issue 11 (24th April 2018)

• Record Type: Journal Article
• Authors: Zhang, Liang; Donaldson, Craig R.; Garner, Jason; Cross, Adrian W.; He, Wenlong
• Is Part Of: IET microwaves, antennas & propagation. Volume 12:Issue 11(2018)
• Page Start: 1748
• Page End: 1751
• Publication Date: 2018-04-24
• Subjects: millimetre wave amplifiers -- millimetre wave tubes -- gyrotrons -- millimetre wave couplers -- waveguide junctions -- numerical analysis -- optimisation -- submillimetre wave couplers -- submillimetre wave amplifiers -- submillimetre wave tubes -- travelling wave amplifiers; input coupling systems -- millimetre‐wave gyrotron travelling wave amplifiers -- W‐band input coupling system -- pillbox window -- smoothly curved waveguide bend -- T‐junction -- broadband reflector -- numerical optimization -- average transmission coefficient -- higher‐frequency input coupler -- multiple‐hole coupling configuration -- frequency 372 GHz; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2018.0040
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : Input couplers for millimetre‐wave gyrotron travelling wave amplifiers are presented in this study. A W‐band input coupling system composed of a pillbox window, a smoothly curved waveguide bend, a T‐junction and a broadband reflector was numerically optimised, constructed and measured. An average transmission coefficient of −2.0 dB over a designed operating frequency range was measured. Additionally, a higher‐frequency input coupler for operation at a central frequency of 372 GHz was also designed based on a multiple‐hole coupling configuration. The simulated transmission coefficient was −0.5 dB if the ohmic loss is not considered.