Investigation of the effect of trapped modes in circular waveguide mode converters

Author

Soekmadji, H. ; Vernon, R.J.

Author_Institution

Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA

fYear

2002

fDate

26-26 Sept. 2002

Firstpage

311

Lastpage

312

Abstract

TE/sub 0n/-TE/sub 0q/ circular waveguide mode converters such as the TE/sub 02/-TE/sub 01/ type typically have radius variations which increase and then decrease again. This provides the possibility for trapped higher order modes which can exist between the uptaper and the downtaper, but cannot escape the region of enlarged radius. Trapped modes can sometimes have a catastrophic effect on device transmission at certain resonant frequencies. The effect of trapped modes are considered in a few simple cases in this paper using the computer simulation programs HFSS and Cascade.

Keywords

circular waveguides; convertors; coupled mode analysis; modal analysis; waveguide theory; circular waveguide increasing/decreasing radius variations; corrugated circular waveguide mode converters; enlarged radius region; resonant frequencies; trapped mode device transmission effects; uptaper/downtaper trapped higher order modes; waveguide trapped mode effects; Computer simulation; Gyrotrons; Heating; Helium; Plasma devices; Plasma simulation; Plasma waves; Resonant frequency; Shape; Tellurium;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared and Millimeter Waves, 2002. Conference Digest. Twenty Seventh International Conference on

Conference_Location

San Diego, CA, USA

Print_ISBN

0-7803-7423-1

Type

conf

DOI

10.1109/ICIMW.2002.1076209

Filename

1076209