Design and analysis of a coaxial coupler for a 35-GHz gyroklystron amplifier

Author

McCurdy, A.H. ; Choi, J.J.

Author_Institution

Dept. of Electr. Eng.-Electrophys., Univ. of Southern California, Los Angeles, CA, USA

Volume

47

Issue

2

fYear

1999

fDate

2/1/1999 12:00:00 AM

Firstpage

164

Lastpage

175

Abstract

A single rectangular TE₁₀ feed four-slot coaxial coupler is designed and built for excitation of a TE₀₁₁ cylindrical cavity mode for use in high-power millimeter-wavelength gyroklystron amplifiers. A high degree of mode purity is obtained and matching of the cavity to the input line is studied. A model based on the mode-matching technique and dipole radiators has been formulated to predict operation of this coupler. The resulting numerical code is capable of finding resonant frequency and cavity bandwidth in a small fraction of the time taken by more general finite-difference/finite-element design tools. The model can be extended to self-consistently include an electron beam, and the model is compared to a coupler design based on Hewlett-Packard´s High-Frequency Structure Simulator code. The coupler has been successfully used in a high-power gyroklystron-amplifier experiment

Keywords

coaxial waveguides; gyrotrons; klystrons; millimetre wave amplifiers; millimetre wave tubes; mode matching; waveguide couplers; 35 GHz; TE₀₁₁ cylindrical cavity mode; cavity bandwidth; coaxial coupler; dipole radiators; electron beam; millimeter-wavelength gyroklystron amplifiers; mode purity; mode-matching technique; resonant frequency; single rectangular TE₁₀ feed four-slot coupler; Bandwidth; Coaxial components; Feeds; Finite difference methods; High power amplifiers; Klystrons; Millimeter wave technology; Predictive models; Resonant frequency; Tellurium;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.744291

Filename

744291