Dispersion Characteristics of Twisted Rectangular Waveguides

Author

Yabe, Hatsuo ; Nishio, Kazunori ; Mushiake, Yasuto

Volume

32

Issue

1

fYear

1984

fDate

1/1/1984 12:00:00 AM

Firstpage

91

Lastpage

96

Abstract

Based on the expressions for the dominant hybrid-mode fields in twisted rectangular waveguides, dispersion formulas with two perturbational factors have been derived theoretically. These factors correspond to the two effects of the twist on the dominant wave propagation, respectively. The one expresses a shift in the cutoff frequency while the other expresses the effect of elongation in the transmission path. A set of 20-cm-long waveguides twisted uniformly by various multiples of 90° has been manufactured by the method of electroforming. The resonant frequencies of the respective waveguides have been measured as a transmission cavity in the 10-GHz band to obtain dispersion relations. Experimental results are found to be in good agreement with the theoretically derived formulas. The results of Lewin´s theory are also compared with the present ones.

Keywords

Cutoff frequency; Dispersion; Electromagnetic fields; Electromagnetic propagation; Electromagnetic waveguides; Frequency measurement; Manufacturing; Rectangular waveguides; Resonant frequency; Waveguide theory;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.1984.1132617

Filename

1132617