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Cutoff frequencies of eccentric circular-elliptic metallic waveguides

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dc.contributor.author Roumeliotis John, A en
dc.contributor.author Savaidis Stylianos, P 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 0018-9480 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/11193
dc.subject Boundary Condition en
dc.subject Electromagnetic Field en
dc.subject.classification Engineering, Electrical & Electronic en
dc.subject.other Electric conductors en
dc.subject.other Electromagnetic fields en
dc.subject.other Function evaluation en
dc.subject.other Geometry en
dc.subject.other Numerical methods en
dc.subject.other Perturbation techniques en
dc.subject.other Boundary conditions en
dc.subject.other Circular elliptic metallic waveguides en
dc.subject.other Derterminantal equation en
dc.subject.other Elliptical cylindrical wave functions en
dc.subject.other Interfocal distance en
dc.subject.other Mathieu functions en
dc.subject.other Translational addition theorems en
dc.subject.other Truncation en
dc.subject.other Circular waveguides en
dc.title Cutoff frequencies of eccentric circular-elliptic metallic waveguides en
heal.type journalArticle en
heal.identifier.primary 10.1109/22.330130 en
heal.identifier.secondary http://dx.doi.org/10.1109/22.330130 en
heal.language English en
heal.publicationDate 1994 en
heal.abstract In this paper semianalytical expressions for the cutoff frequencies of eccentric circular-elliptic perfectly conducting waveguides, are derived for both TM and TE modes. Two types of waveguides are considered, one with circular inner and elliptic outer conductor and one with elliptic inner and circular outer conductor. The electromagnetic field is expressed in terms of both circular and elliptical cylindrical wave functions, which are connected with one another by well-known expansion formulas. Translational addition theorems for circular cylindrical wave functions are also used for the satisfaction of the boundary conditions in the outer conductor. When the solutions are specialized to small values of h = kc/2 (c is the interfocal distance of the elliptic conductor and k the cutoff wavenumber) semianalytical expressions of the form f(h) = f(0)[1 + gh2 + O(h4)] are obtained for the cutoff frequencies of the corresponding waveguide. For several values of the parameters, both waveguides may appear larger operational bandwidth as compared to that of the corresponding eccentric circular one. Numerical results for both waveguides and both kinds of modes are given for various values of the parameters. en
heal.publisher IEEE, Piscataway, NJ, United States en
heal.journalName IEEE Transactions on Microwave Theory and Techniques en
dc.identifier.doi 10.1109/22.330130 en
dc.identifier.isi ISI:A1994PP98200018 en
dc.identifier.volume 42 en
dc.identifier.issue 11 en
dc.identifier.spage 2128 en
dc.identifier.epage 2138 en


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