Determination of TWT periodic delay line dispersion by means of coupled waveguide analysis

Phase dispersion of an alternate-slot coupled-cavity circuit suitable for use in TWTs (traveling-wave tubes) is determined by means of coupled mode theory. A circuit is modeled using the familiar waveguide elements: coaxial, cylindrical, and sector types. Their orthonormal modes are well known and f...

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Bibliographic Details
Main Authors: Holstein, D.G., Dionne, N., Palevsky, A.
Format: Conference Proceeding
Language:English
Subjects:
Boundary conditions
Coaxial components
Coupling circuits
Delay lines
Dispersion
Maxwell equations
Planar waveguides
Radio frequency
Rectangular waveguides
Waveguide junctions
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Summary:Phase dispersion of an alternate-slot coupled-cavity circuit suitable for use in TWTs (traveling-wave tubes) is determined by means of coupled mode theory. A circuit is modeled using the familiar waveguide elements: coaxial, cylindrical, and sector types. Their orthonormal modes are well known and form the basis vectors for constructing the possible delay line modes, both propagating and nonpropagating. Application of Floquet's theorem as a boundary condition results in a direct determination of the phase shift per period of the structure at arbitrary frequencies. Provision in the analysis for multiply connected waveguides enables beam-hole effects to be included. Dispersion properties at midband are computed to be within 0.5% of measured values.< >
ISSN:0163-1918
2156-017X
DOI:10.1109/IEDM.1989.74263