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dc.contributor.authorZiolkowski, Richard W.
dc.date.accessioned2017-11-17T19:32:24Z
dc.date.available2017-11-17T19:32:24Z
dc.date.issued2017-10-11
dc.identifier.citationThe directivity of a compact antenna: an unforgettable figure of merit 2017, 4:7 EPJ Applied Metamaterialsen
dc.identifier.issn2272-2394
dc.identifier.doi10.1051/epjam/2017006
dc.identifier.urihttp://hdl.handle.net/10150/626104
dc.description.abstractWhen an electrically small antenna is conceived, designed, simulated, and tested, the main emphasis is usually placed immediately on its impedance bandwidth and radiation efficiency. All too often it is assumed that its directivity will only be that of a Hertzian dipole and, hence, its directivity becomes a minor consideration. This is particularly true if such a compact antenna radiates in the presence of a large ground plane. Attention is typically focused on the radiator and its size, while the ground plane is forgotten. This has become a too frequent occurrence when antennas, such as patch antennas that have been augmented with metamaterial structures, are explored. In this paper, it is demonstrated that while the ground plane has little impact on the resonance frequency and impedance bandwidth of patch antennas or metamaterial-inspired three-dimensional magnetic EZ antennas, it has a huge impact on their directivity performance. Moreover, it is demonstrated that with both a metamaterial-inspired two-element array and a related Huygens dipole antenna, one can achieve broadside-radiating electrically small systems that have high directivities. Several common and original designs are used to highlight these issues and to emphasize why a fundamental figure of merit such as directivity should never be overlooked.
dc.language.isoenen
dc.publisherEDP SCIENCES S Aen
dc.relation.urlhttp://epjam.edp-open.org/10.1051/epjam/2017006en
dc.rights© R.W. Ziolkowski, published by EDP Sciences, 2017. This is an Open Access article distributed under the terms of the Creative Commons Attribution License.en
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectDirectivityen
dc.subjectElectrically small antennasen
dc.subjectHuygens sourceen
dc.subjectMetamaterial-inspired antennasen
dc.subjectPatch antennasen
dc.titleThe directivity of a compact antenna: an unforgettable figure of meriten
dc.typeArticleen
dc.contributor.departmentUniv Arizona, Dept Elect & Comp Engnen
dc.identifier.journalEPJ Applied Metamaterialsen
dc.description.noteOpen Access Journal.en
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal published versionen
refterms.dateFOA2018-08-14T07:43:48Z
html.description.abstractWhen an electrically small antenna is conceived, designed, simulated, and tested, the main emphasis is usually placed immediately on its impedance bandwidth and radiation efficiency. All too often it is assumed that its directivity will only be that of a Hertzian dipole and, hence, its directivity becomes a minor consideration. This is particularly true if such a compact antenna radiates in the presence of a large ground plane. Attention is typically focused on the radiator and its size, while the ground plane is forgotten. This has become a too frequent occurrence when antennas, such as patch antennas that have been augmented with metamaterial structures, are explored. In this paper, it is demonstrated that while the ground plane has little impact on the resonance frequency and impedance bandwidth of patch antennas or metamaterial-inspired three-dimensional magnetic EZ antennas, it has a huge impact on their directivity performance. Moreover, it is demonstrated that with both a metamaterial-inspired two-element array and a related Huygens dipole antenna, one can achieve broadside-radiating electrically small systems that have high directivities. Several common and original designs are used to highlight these issues and to emphasize why a fundamental figure of merit such as directivity should never be overlooked.


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© R.W. Ziolkowski, published by EDP Sciences, 2017. This is an Open Access article distributed under the terms of the Creative Commons Attribution License.
Except where otherwise noted, this item's license is described as © R.W. Ziolkowski, published by EDP Sciences, 2017. This is an Open Access article distributed under the terms of the Creative Commons Attribution License.