{"title":"A frequency-dependent FDTD method for induced-current calculations for a heterogeneous model of the human body","authors":"O. Gandhi, J. Chen, C. Furse","doi":"10.1109/MWSYM.1992.188236","DOIUrl":null,"url":null,"abstract":"A weakness of the FDTD (finite-difference, time-domain) method is that dispersion of the dielectric properties of the scattering/absorption body is often ignored and frequency-independent properties are generally taken. While this is not a disadvantage for continuous-wave or narrowband irradiation, the results thus obtained may be higher erroneous for short pulses where ultrawide bandwidths are involved. A differential equation approach was developed. It can be used for general dispersive media for which in *( omega ) and mu *( omega ) may be expressible in terms of ration functions, or for human tissues where multiterm Debye relaxation equations must generally be used. The method is illustrated by means of one- and three-dimensional examples of media for which in *( omega ) is given by a multiterm Debye equation and for a dispersive model of the human body.<<ETX>>","PeriodicalId":165665,"journal":{"name":"1992 IEEE Microwave Symposium Digest MTT-S","volume":"45 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1992-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"1992 IEEE Microwave Symposium Digest MTT-S","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/MWSYM.1992.188236","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 3
Abstract
A weakness of the FDTD (finite-difference, time-domain) method is that dispersion of the dielectric properties of the scattering/absorption body is often ignored and frequency-independent properties are generally taken. While this is not a disadvantage for continuous-wave or narrowband irradiation, the results thus obtained may be higher erroneous for short pulses where ultrawide bandwidths are involved. A differential equation approach was developed. It can be used for general dispersive media for which in *( omega ) and mu *( omega ) may be expressible in terms of ration functions, or for human tissues where multiterm Debye relaxation equations must generally be used. The method is illustrated by means of one- and three-dimensional examples of media for which in *( omega ) is given by a multiterm Debye equation and for a dispersive model of the human body.<>
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