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Measurement of the propagation characteristics of shielded and unshielded dielectric-tube waveguides

Accurate measurements of the propagation coefficient of the HE₁₁ mode on polythene-tube waveguides in air and surrounded by a polyfoam shield are reported. These were carried out at X-band frequencies using a cavity-resonance method. The results obtained confirm previous theoretical predictions although there is an element of uncertainty concerning the exact dielectric properties of the commercial grade polythene tubes used. The measurements also yielded the phase coefficient of the HE₁₁ mode which was confirmed by measurement of the radial decay of the electric field outside the tube.
Enclosing the dielectric-tube in a low-density, low-loss polyfoam shield resulted in only a slight degradation of the attenuation characteristics of the waveguides.
Measurements of the phase characteristics of the higher order TE₀₁ and TM₀₁ modes on the tube at frequencies close to cutoff are also reported. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

Identiferoai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/34268
Date January 1970
CreatorsMakino, Ikufumi
PublisherUniversity of British Columbia
Source SetsUniversity of British Columbia
LanguageEnglish
Detected LanguageEnglish
TypeText, Thesis/Dissertation
RightsFor non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.

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