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dc.contributor.authorAbd-Alhameed, Raed*
dc.contributor.authorSee, Chan H.*
dc.contributor.authorExcell, Peter S.*
dc.contributor.authorMcEwan, Neil J.*
dc.contributor.authorAli, N.T.*
dc.date.accessioned2017-05-26T14:50:56Z
dc.date.available2017-05-26T14:50:56Z
dc.date.issued2017-05-17
dc.identifier.citationAbd-Alhameed RA, See CH, Excell PS et al (2017) Calibration Model for Detection of Potential Demodulating Behaviour in Biological Media Exposed to RF Energy. IET Science, Measurement & Technology: 1-18.en_US
dc.identifier.urihttp://hdl.handle.net/10454/12058
dc.descriptionYesen_US
dc.description.abstractPotential demodulating ability in biological tissue exposed to Radio Frequency (RF) signals intrinsically requires an unsymmetrical diode-like nonlinear response in tissue samples. This may be investigated by observing possible generation of the second harmonic in a cavity resonator designed to have fundamental and second harmonic resonant frequencies with collocated antinodes. Such a response would be of interest as being a mechanism that could enable demodulation of information-carrying waveforms having modulating frequencies in ranges that could interfere with cellular processes. Previous work has developed an experimental system to test for such responses: the present work reports an electric circuit model devised to facilitate calibration of any putative nonlinear RF energy conversion occurring within a nonlinear test-piece inside the cavity. The method is validated computationally and experimentally using a well-characterised nonlinear device. The variations of the reflection coefficients of the fundamental and second harmonic responses of the cavity due to adding nonlinear and lossy material are also discussed. The proposed model demonstrates that the sensitivity of the measurement equipment plays a vital role in deciding the required input power to detect any second harmonic signal, which is expected to be very weak. The model developed here enables the establishment of a lookup table giving the level of the second harmonic signal in the detector as a function of the specific input power applied in a measurement. Experimental results are in good agreement with the simulated results.en_US
dc.description.sponsorshipEngineering and Physical Science Research Council through Grant EP/E022936Aen_US
dc.language.isoenen_US
dc.rights(c) 2017 IET. This paper is a post-print of a paper submitted to and accepted for publication in the IET Science, Measurement and Technology and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library.en_US
dc.subjectRadio frequency; Cavity resonator; Computational electromagnetics; Nonlinear materialen_US
dc.titleCalibration Model for Detection of Potential Demodulating Behaviour in Biological Media Exposed to RF Energyen_US
dc.status.refereedYesen_US
dc.date.Accepted2017-05-11
dc.typeArticleen_US
dc.type.versionAccepted Manuscripten_US
dc.identifier.doihttps://doi.org/10.1049/iet-smt.2017.0105
refterms.dateFOA2018-07-26T09:30:09Z


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