Cutoff frequencies and modes of a cylindrical-rectangular waveguide with an off-axis inner dielectric cylinder of small radius

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dc.contributor.author Roumeliotis, JA en
dc.date.accessioned 2014-03-01T01:09:47Z
dc.date.available 2014-03-01T01:09:47Z
dc.date.issued 1994 en
dc.identifier.issn 0016-0032 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/11192
dc.subject.classification Automation & Control Systems en
dc.subject.classification Engineering, Multidisciplinary en
dc.subject.classification Engineering, Electrical & Electronic en
dc.subject.classification Mathematics, Interdisciplinary Applications en
dc.subject.other Bandwidth en
dc.subject.other Conductive materials en
dc.subject.other Cylinders (shapes) en
dc.subject.other Dielectric materials en
dc.subject.other Electric fields en
dc.subject.other Frequencies en
dc.subject.other Functions en
dc.subject.other Graphic methods en
dc.subject.other Magnetic fields en
dc.subject.other Magnetic permeability en
dc.subject.other Permittivity en
dc.subject.other Rectangular waveguides en
dc.subject.other Conducting inner cylinder en
dc.subject.other Cutoff frequencies en
dc.subject.other Dielectric cylinder en
dc.subject.other Circular waveguides en
dc.title Cutoff frequencies and modes of a cylindrical-rectangular waveguide with an off-axis inner dielectric cylinder of small radius en
heal.type journalArticle en
heal.identifier.primary 10.1016/0016-0032(94)90002-7 en
heal.identifier.secondary http://dx.doi.org/10.1016/0016-0032(94)90002-7 en
heal.language English en
heal.publicationDate 1994 en
heal.abstract Analytical expressions for the cutoff frequencies and modes of a cylindrical- rectangular waveguide containing an off-axis inner dielectric cylinder with electrically small radius are derived, for both TM and TE modes. The walls of the waveguide as well as the dielectric cylinder are both lossless. Cylindrical-rectangular wave functions and related addition theorems-expansion in terms of cylindrical ones, are used. The results are useful for waveguides containing inhomogeneities of small radius, as well as for the determination of the permittivity or magnetic permeability of various materials, by measuring the shifts of the cutoff frequencies caused by the introduction of cylindrical samples of them, inside waveguides. The results for a conducting inner cylinder are a special case of the present ones. Graphical results giving the cutoff frequencies for some of the lower order modes are given, for various values of the parameters and for both kinds of modes. For several values of the parameters the presence of the inner cylinder increases the bandwidth of the dominant mode in comparison to that of the unperturbed waveguide. © 1994. en
heal.journalName Journal of the Franklin Institute en
dc.identifier.doi 10.1016/0016-0032(94)90002-7 en
dc.identifier.isi ISI:A1994TH29600002 en
dc.identifier.volume 331 en
dc.identifier.issue 4 en
dc.identifier.spage 345 en
dc.identifier.epage 366 en

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