Assessing the intrinsic radiation efficiency of tissue implanted UHF antennas

dc.contributor.authorEl-Saboni, Yomna
dc.contributor.authorZelenchuk, Dmitry E.
dc.contributor.authorConway, Gareth A.
dc.contributor.authorScanlon, William G.
dc.description.abstractDielectric loss occurring in tissues in close proximity to UHF implanted antennas is an important factor in the performance of medical implant communication systems. Common practice in numerical analysis and testing is to utilize radiation efficiency measures external to the tissue phantom employed. This approach means that radiation efficiency is also dependent on the phantom used and antenna positioning, making it difficult to understand antenna performance and minimize near-field tissue losses. Therefore, an alternative methodology for determining the intrinsic radiation performance of implanted antennas that focuses on assessing structural and near field tissue losses is presented. The new method is independent of the tissue phantom employed and can be used for quantitative comparison of designs across different studies. The intrinsic radiation efficiency of an implant antenna is determined by assessing the power flow within the tissue phantom at a distance of at least λg/2 from the radiating structure. Simulated results are presented for canonical antennas at 403 MHz and 2400 MHz in homogeneous muscle and fat phantoms. These illustrate the dominance of propagating path losses in high-water content tissues such as muscle, whereas nearfield dielectric losses may be more important in low-water tissues such as fat due to the extended reactive near-field.en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.identifier.citationEl-Saboni, Y., Zelenchuk, D. E., Conway, G. A. and Scanlon, William G. (2019) 'Assessing the intrinsic radiation efficiency of tissue implanted UHF antennas'. IEEE Transactions On Antennas and Propagation, In press. DOI: 10.1109/TAP.2019.2935113en
dc.identifier.journaltitleIEEE Transactions On Antennas and Propagationen
dc.rights© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE 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.en
dc.subjectAntenna efficiencyen
dc.subjectRadiation efficiencyen
dc.subjectImplantable antennasen
dc.subjectReactive near-fielden
dc.subjectPath lossen
dc.subjectAntenna characterizationen
dc.titleAssessing the intrinsic radiation efficiency of tissue implanted UHF antennasen
dc.typeArticle (peer-reviewed)en
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