Design and Measurement of a Broadband Sidewall Coupler for a W-Band Gyro-TWA

Author

Liang Zhang ; Wenlong He ; Donaldson, Craig R. ; Garner, Jason R. ; McElhinney, Paul ; Cross, Adrian W.

Author_Institution

Dept. of Phys., Univ. of Strathclyde, Glasgow, UK

Volume

63

Issue

10

fYear

2015

Firstpage

3183

Lastpage

3190

Abstract

The input coupler is an important component for a microwave amplifier. In this paper, a sidewall single-hole input coupler for a W-band gyrotron traveling-wave amplifier that operates at the frequency range of 90-100 GHz was designed and measured. Instead of using a cutoff waveguide, a broadband Bragg-type reflector with a small spread in phase was optimized for use as part of the input coupler. The minimum radius of the reflector was two times the size of a cutoff waveguide, which reduced the possibility for some of the beam electrons being collected in this section and lost to the amplifier interaction region.

Keywords

gyrotrons; millimetre wave amplifiers; travelling wave amplifiers; waveguide couplers; W-band gyro-TWA; amplifier interaction region; beam electrons; broadband Bragg-type reflector; broadband sidewall coupler; cutoff waveguide; frequency 90 GHz to 100 GHz; gyrotron traveling-wave amplifier; sidewall single-hole input coupler; Bandwidth; Broadband communication; Couplers; Electron beams; Geometry; Microwave theory and techniques; Periodic structures; Bragg reflector; gyrotron traveling-wave amplifier (gyro-TWA); input coupler;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2015.2464302

Filename

7202916