Design and Measurement of a Nonlinear-Curve Directional Coupler for Sheet Beam Traveling Wave Tube

A new type of input/output coupler for sheet beam traveling wave tube is designed, analyzed, and measured in this paper. In the design, a special sloped coupling aperture distributed between two paralleled rectangular waveguides in H-plane is employed for compact dimensions, ease of fabrication, att...

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Bibliographic Details
Published in:IEEE transactions on electron devices 2016-09, Vol.63 (9), p.3733-3739
Main Authors: Liya Yang, Jianxun Wang, Guoxiang Shu, Guo Liu, Balfour, E. Agurgo, Yelei Yao, Kun Dong, Hao Fu, Yong Luo
Format: Article
Language:English
Subjects:
Apertures
Bandwidth
Beams (radiation)
Chebyshev approximation
Computer simulation
Couplers
Coupling
Couplings
Design analysis
Design engineering
Directional coupler
H-plane
nonlinear-curve coupling aperture
Rectangular waveguides
sheet beam traveling wave tube
Traveling wave tubes
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Summary:A new type of input/output coupler for sheet beam traveling wave tube is designed, analyzed, and measured in this paper. In the design, a special sloped coupling aperture distributed between two paralleled rectangular waveguides in H-plane is employed for compact dimensions, ease of fabrication, attainment of high power capacity, and more convenience for periodic cusped magnet focusing system. A nonlinear-curve profile with Chebyshev-curve distribution is applied to extend the operating frequency bandwidth while suppressing reflections to avoid generating oscillation in the slow-wave structure. Based on the analytical investigation and numerical simulation, an optimized sloping angle of the coupling aperture is obtained to improved performance. Simulations imply that the coupler achieves a broadband bandwidth (S 11
ISSN:0018-9383
1557-9646
DOI:10.1109/TED.2016.2593663