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

Roumeliotis, JA

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.publisher	PERGAMON-ELSEVIER SCIENCE LTD	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