Limitations of the transmission line theory in the simulation of ultra thin wire conductivities with coaxial resonators

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dc.book.title2007 EUROPEAN MICROWAVE CONFERENCE, VOLS 1-4
dc.conference.dateOCT 08-12, 2007
dc.conference.placeMunich, GERMANY
dc.conference.title2007 EUROPEAN MICROWAVE CONFERENCE, VOLS 1-4
dc.contributor.authorBernardino Santos, Teodoro
dc.contributor.authorAntoranz Canales, Pedro
dc.contributor.authorMiranda Pantoja, José Miguel
dc.contributor.authorSebastián Franco, José Luis
dc.date.accessioned2023-06-20T13:40:18Z
dc.date.available2023-06-20T13:40:18Z
dc.date.issued2007
dc.descriptionEuropean Microwave Conference (37. 2007. Munich, Alemania).
dc.description.abstractThis work aims to illustrate how the transmission line theory may yield to strong errors in predicting the reflection coefficient at the input of a short - circuited coaxial transmission line when the inner conductor is either thin enough or lossy enough to have a measurable DC ohmic resistance. These situations are found in the measurement of wire conductivities at RF frequencies with coaxial resonators. The transmission line theory is based on the assumption that the current flowing through a conductor is located at its surface. However, this hypothesis is not accurate in a number of practical situations. In order to identify some of them, we have made a comparison between the simulations and measurements of the reflection coefficient at the input of a short circuited coaxial resonator where the centre conductor is a thin wire made of either a good conductor (high purity platinum) or a poor one (carbon fibre). The transmission line theory is not able to predict accurately the conductivity of any of these wires at frequencies below 300-500 MHz, where there is a strong frequency dependence of the resistance used in the modelling of the distributed conductor losses. In order to account for this effect, a model is proposed, which is based on modifying the distributed resistance, which account for conductor losses. This model is computationally effortless and was verified with measurements of different materials and with different thicknesses.
dc.description.departmentDepto. de Estructura de la Materia, Física Térmica y Electrónica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipSpanish FIS
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/23861
dc.identifier.citation[1] D. Pozar, Microwave Engineering, 3rd ed., John Wiley and Sons, 2005. [2] P.C. Magnusson, Transmission Lines and Wave Propagation, 2nd ed., Allyn and Bacon, 1970. [3] A.M. Azzeer, L.M. Silber, I.L. Spain and C.E. Patton, “Applicability of the microwave cavity perturbation method for conductivity measurements on carbon fibers”, Journal of Applied Physics vol. 57, pp. 2529–2531, 1985. [4] F. Pérez, A. Madroñero, C. Merino and W. Brandl, “Impedance of vapor grown carbon fibres for frequencies up to 10 GHz“, in 7th International Conference on Microwave and High Frequency Heating, 2004, pp. 115–118.
dc.identifier.doi10.1109/EUMC.2007.4405466
dc.identifier.isbn978-2-87487-001-9
dc.identifier.issn978-2-87487-001-9
dc.identifier.officialurlhttp://dx.doi.org/10.1109/EUMC.2007.4405466
dc.identifier.relatedurlhttp://ieeexplore.ieee.org
dc.identifier.urihttps://hdl.handle.net/20.500.14352/53315
dc.journal.title2007 EUROPEAN MICROWAVE CONFERENCE, VOLS 1-4
dc.language.isoeng
dc.page.final1404
dc.page.initial1401
dc.publisherIEEE
dc.relation.projectIDPIO3/0295
dc.rights.accessRightsrestricted access
dc.subject.cdu537
dc.subject.keywordCeramics
dc.subject.keywordCoaxial Resonators
dc.subject.keywordDelay Filters
dc.subject.keywordDelay-Lines
dc.subject.keywordPower Amplifiers.
dc.subject.ucmElectrónica (Física)
dc.subject.ucmElectricidad
dc.subject.unesco2202.03 Electricidad
dc.titleLimitations of the transmission line theory in the simulation of ultra thin wire conductivities with coaxial resonators
dc.typebook part
dspace.entity.typePublication
relation.isAuthorOfPublication6bc87e5f-9b77-4982-b112-0d4f8aa128d0
relation.isAuthorOfPublication328f9716-2012-44f9-aacc-ef8d48782a77
relation.isAuthorOfPublication53e43c76-7bce-46fd-9520-0edb4620c996
relation.isAuthorOfPublication.latestForDiscovery6bc87e5f-9b77-4982-b112-0d4f8aa128d0
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