A wideband planar helix slow-wave structure for millimeter-wave TWTs

Author

Chen Zhao ; Aditya, Sheel ; Shaomeng Wang ; Chua, Ciersiang

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore

fYear

2015

fDate

27-29 April 2015

Firstpage

1

Lastpage

2

Abstract

A wideband design of a slow-wave structure (SWS) consisting of planar helix with straight edge connections is proposed here. Dispersion is reduced by placing the metal shield close to the SWS, by including ground planes, and by reducing the amount of dielectric material. The design leads to an octave bandwidth centered at 30 GHz for the `cold´ SWS. The design can be implemented using microfabrication techniques. For a design with 150 periods and a 3750 V, 10 mA electron beam, a small-signal gain of 36 dB and a saturated output power of 6.65 W is predicted at 30 GHz. The design approach appears promising for wideband millimeter-wave traveling tubes.

Keywords

millimetre wave tubes; slow wave structures; dielectric material; frequency 30 GHz; gain 36 dB; millimeter wave TWT; millimeter wave traveling wave tube; power 6.65 W; voltage 3750 V; wideband TWT; wideband planar helix slow wave structure; Power generation; Scattering parameters; microfabrication; millimeter-wave TWTs; planar helix; slow wave structure;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference (IVEC), 2015 IEEE International

Conference_Location

Beijing

Print_ISBN

978-1-4799-7109-1

Type

conf

DOI

10.1109/IVEC.2015.7223748

Filename

7223748