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dc.contributor.authorShahpari, Morteza
dc.contributor.authorThiel, David
dc.date.accessioned2019-05-29T13:13:11Z
dc.date.available2019-05-29T13:13:11Z
dc.date.issued2018
dc.identifier.issn0018-926X
dc.identifier.doi10.1109/TAP.2018.2836447
dc.identifier.urihttp://hdl.handle.net/10072/381783
dc.description.abstractSmall volume, finite conductivity, and high frequencies are major imperatives in the design of communications infrastructure. The radiation efficiency ηr impacts on the optimal gain, quality factor, and bandwidth. The current efficiency limit applies to structures confined to a radian sphere ka (k is the wavenumber and a is the radius). Here, we present new fundamental limits to ηr for arbitrary antenna shapes based on k2S, where S is the conductor surface area. For a dipole with an electrical length of 10−5 our result is two orders of magnitude closer to the analytical solution when compared with previous bounds on the efficiency. The improved bound on ηr is more accurate, more general, and easier to calculate than other limits. The efficiency of an antenna cannot be larger than the case where the surface of the antenna is peeled off and assembled into a planar sheet with area S, and a uniform current is excited along the surface of this sheet.
dc.description.peerreviewedYes
dc.languageEnglish
dc.publisherIEEE
dc.publisher.placeUnited States
dc.relation.ispartofpagefrom3894
dc.relation.ispartofpageto3901
dc.relation.ispartofissue8
dc.relation.ispartofjournalIEEE Transactions on Antennas and Propagation
dc.relation.ispartofvolume66
dc.subject.fieldofresearchElectrical and Electronic Engineering not elsewhere classified
dc.subject.fieldofresearchElectrical and Electronic Engineering
dc.subject.fieldofresearchCommunications Technologies
dc.subject.fieldofresearchcode090699
dc.subject.fieldofresearchcode0906
dc.subject.fieldofresearchcode1005
dc.subject.keywordsAntenna efficiency
dc.subject.keywordsConductivity
dc.subject.keywordsEfficiency
dc.subject.keywordsFundamental limit
dc.subject.keywordsSkin depth
dc.subject.keywordsUpper bound
dc.titleFundamental Limitations for Antenna Radiation Efficiency
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Sciences, School of Engineering and Built Environment
gro.rights.copyright© 2018 IEEE Transactions on Antennas and Propagation. Personal use of this material is permitted. Permission from IEEE Transactions on Antennas and Propagation must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
gro.hasfulltextFull Text
gro.griffith.authorThiel, David V.
gro.griffith.authorShahpari, Morteza


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