DocumentCode :
1444854
Title :
New developments in multiconductor slow-wave transmission lines of circular cross-section
Author :
Barlow, H.M. ; Nouri, M.
Author_Institution :
University College London, London, UK
Volume :
123
Issue :
5
fYear :
1976
fDate :
5/1/1976 12:00:00 AM
Firstpage :
381
Lastpage :
388
Abstract :
Equispaced parallel wires located around the circumference of a circle are used to form a cylindrical grid structure operating as a waveguide at 3 GHz. It is shown that a number of distinctive slow-wave modes can propagate along such a guide and among them one finds the Goubau wave, a variety of TEM configurations and the dipole mode. Launching filters enable each mode in turn to be identified and preserved for individual measurements. At the same time, a theoretical investigation is made applying superposition of separate circularly symmetrical surface waves assumed to be associated with each conductor as a single-wire transmission line. Calculations from the theory show good agreement with experiment. It is found that dipole-mode propagation along an 8-wire guide of the kind considered here, has an attenuation 40% below that of the corresponding 2-wire line and provides for a close approach to uniform energy-density over the cross-section of the structure. Moreover, the field outside the surface of the guide is much smaller than in the case of the 8-wire Goubau line.
Keywords :
guided electromagnetic wave propagation; transmission line theory; dipole mode propagation; guided EM wave propagation; slow wave mode; surface waves; transmission lines; waveguide theory;
fLanguage :
English
Journal_Title :
Electrical Engineers, Proceedings of the Institution of
Publisher :
iet
ISSN :
0020-3270
Type :
jour
DOI :
10.1049/piee.1976.0087
Filename :
5253792
Link To Document :
بازگشت