Antenna with a reactive impedance substrate for mine rescue applications

dc.contributor.authorRoestorff, Martin
dc.contributor.authorOdendaal, J.W. (Johann Wilhelm)
dc.contributor.authorJoubert, Johan
dc.contributor.emailwimpie@up.ac.zaen_ZA
dc.date.accessioned2018-11-29T12:28:42Z
dc.date.issued2019-01
dc.description.abstractTwo electrically small, reactive impedance surface (RIS) backed, antennas are presented that can be used by rescue workers to locate miners in emergency situations in underground mines. One antenna was designed for optimum impedance bandwidth and the other for compact size, with at least 5% impedance bandwidth. At 433 MHz both antennas have maximum gain values above 5 dBi, and both antennas radiate on average at least 10 dB more power in the front hemisphere than in the rear hemisphere, to reduce interaction with the wearer and aid in locating the missing miners. The first antenna, a planar monopole antenna with RIS backplane had a −10 dB reflection coefficient bandwidth of 25.1%, and a form factor of 0.4 λ0 by 0.4 λ0 by 0.069 λ0. The second antenna, a loaded planar monopole antenna with RIS backplane had a −10 dB reflection coefficient bandwidth of 5.3%, and a form factor of 0.346 λ0 by 0. 346 λ0 by 0.107 λ0. Measured and simulated results for the two antennas are presented.en_ZA
dc.description.departmentElectrical, Electronic and Computer Engineeringen_ZA
dc.description.embargo2020-01-01
dc.description.librarianhj2018en_ZA
dc.description.sponsorshipNational Research Foundation (NRF) of South Africa, Grant/Award Number: 114941.en_ZA
dc.description.urihttp://wileyonlinelibrary.com/journal/mopen_ZA
dc.identifier.citationRoestorff M, Odendaal JW, Joubert J. Antenna with a reactive impedance sub-strate for mine rescue applications. Microwave and Optical Technology Letters. 2019;61:44–50. https://doi.org/10.1002/mop.31541.en_ZA
dc.identifier.issn0895-2477 (print)
dc.identifier.issn1098-2760 (online)
dc.identifier.other10.1002/mop.31541
dc.identifier.urihttp://hdl.handle.net/2263/67414
dc.language.isoenen_ZA
dc.publisherWileyen_ZA
dc.rights© 2018 Wiley Periodicals, Inc. This is the pre-peer reviewed version of the following article : Antenna with a reactive impedance sub-strate for mine rescue applications. Microwave and Optical Technology Letters. 2019;61:44–50. https://doi.org/10.1002/mop.31541. The definite version is available at : http://wileyonlinelibrary.com/journal/mop.en_ZA
dc.subjectReactive impedance surface (RIS)en_ZA
dc.subjectCompact antennasen_ZA
dc.subjectWearable antennasen_ZA
dc.subjectElectric impedanceen_ZA
dc.subjectPlanar monopole antennaen_ZA
dc.subjectOptimum impedanceen_ZA
dc.subjectImpedance bandwidthsen_ZA
dc.subjectEmergency situationen_ZA
dc.subjectElectrically smallsen_ZA
dc.subjectVariable frequency oscillatorsen_ZA
dc.subjectReflectionen_ZA
dc.subjectMonopole antennasen_ZA
dc.subjectMinersen_ZA
dc.subjectMine rescueen_ZA
dc.subjectInterlocking signalsen_ZA
dc.subjectBandwidthen_ZA
dc.subjectApproximation theoryen_ZA
dc.titleAntenna with a reactive impedance substrate for mine rescue applicationsen_ZA
dc.typePostprint Articleen_ZA

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