Uncertainty Analysis of the Rational Function Model Used in the Complex Permittivity Measurement of Biological Tissues Using PMCT Probes Within a Wide Microwave Frequency Band

Wang, Zhanxian; Che, Wenquan; Zhou, and Lixue

doi:10.2528/pier09010403

Cited by 10 publications

(9 citation statements)

References 17 publications

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“…On the other hand S-parameters computed using the parameters defined by (25) and (26) allow for the easy computation of the ratios of time-averaged power necessary for this work, even when η s and η l are complex. From (25) …”

Section: Appendix a Derivation Of Equations (16)-(18)mentioning

confidence: 99%

Computationally Efficient Model for Uwb Signal Attenuation Due to Propagation in Tissue for Biomedical Implants

Theilmann¹,

Tassoudji²,

Teague³

et al. 2012

PIER B

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Abstract-An analytical model which predicts the attenuation of ultrawide-band (UWB) signals as they traverse various inhomogeneous tissues is presented. The model provides a computationally efficient method of determining the frequency-dependent losses encountered by electromagnetic radio frequency (RF) signals used to communicate with biomedical implants.Classic transmission line theory is employed to generate an analytical representation which models the inhomogeneous tissue using layers of homogeneous material. The proposed model was verified experimentally with tests of both single and multilayer samples. A realistic abdominal implant scenario was also modeled and the predictions were verified using a commercially available 3D electromagnetic (EM) simulator. The results of this study indicate that for deep implants the higher frequency portion of the UWB spectrum is attenuated much more strongly than the lower end of the band. This implies that for robust communication UWB signals targeting biomedical implants should be limited to the lower portion of the spectrum.

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Section: Appendix a Derivation Of Equations (16)-(18)mentioning

confidence: 99%

Computationally Efficient Model for Uwb Signal Attenuation Due to Propagation in Tissue for Biomedical Implants

Theilmann¹,

Tassoudji²,

Teague³

et al. 2012

PIER B

View full text Add to dashboard Cite

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“…It should be noted that in study [11] On the other hand, the experimental validation remains very limited by the available techniques for measuring the electromagnetic properties of human tissues, even though lately some approaches have been developed for measurement of permittivity of complex tissues that might be used, to some extent, and for biological tissues [21][22][23][24][25].…”

Section: Ghzmentioning

confidence: 99%

Derivation of Electromagnetic Properties of Child Biological Tissues at Radio Frequencies

Ibrani

Ahma²,

Hamiti³

et al. 2011

PIER Letters

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Abstract-The knowledge of electromagnetic properties of biological tissues is required to assess the radio frequency energy deposition in children exposed to electromagnetic fields. The issue whether children should be considered a dosimetric sensitive group in comparison to adults, to which the confirmation of age-dependence of human tissue electromagnetic properties potentially may contribute remains debatable at scientific forums. This paper derives the formula for calculation of electromagnetic properties (permittivity and conductivity) of children tissues, as a function of height, weight, and age, respectively. By using the proposed formula, we have calculated and presented electromagnetic properties of the muscle, brain (gray matter) and skin for 1-year-old to 10-year-old children for 900 MHz, 1800 MHz and 2.4 GHz, at which frequencies most of radio frequency devices used by children operate. The trend over the age of child electromagnetic properties has been presented, and electromagnetic properties at different frequencies for the same child age have also been compared. For certain tissues, comparison between the children at various age and adult electromagnetic parameters has been given. A database with electromagnetic properties for children, of all ages, tissues and frequencies may be built up with the proposed approach. It will further advance research on the assessment of children exposure to electromagnetic fields. Formula can also be used for the determination of electromagnetic parameters for children with specific height and weight.

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“…Transmission/reflection method is commonly preferred to measure electromagnetic properties of microwave materials [1,2], and the temperatures can be up to 1000 • C [3]. Open-ended coaxial probe method is usually used to measure complex permittivity at high temperatures due to the advantages of broad frequency band and simple measurement process [4][5][6]. But while applied in measuring low-loss materials these methods have high measurement uncertainties.…”

Section: Introductionmentioning

confidence: 99%

Broadband Complex Permittivity Measurement of Low Loss Materials Over Large Temperature Ranges by Stripline Resonator Cavity Using Segmentation Calculation Method

Zhou¹,

Li²,

Guo³

et al. 2011

PIER

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Abstract-A system has been developed for measuring the complex permittivity of low loss materials at frequencies from 500 MHz to 7 GHz and over a temperature range up to 1500 • C using stripline resonator cavity method. Details of the design and fabrication of the cavity were discussed. Particular features related to high-temperature operation were described. An improved resonance method at high temperature for determining complex dielectric properties of low-loss materials was developed. The calculation process was given by a physical model of the stripline resonator cavity at high temperature. The paper brought forward the method of segmentation calculation according to the temperature changes over the cavity, which matched the actual situation of high temperature measurements. We have verified the proposed method from measurements of some typical samples with the available reference data in the literature.

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Uncertainty Analysis of the Rational Function Model Used in the Complex Permittivity Measurement of Biological Tissues Using PMCT Probes Within a Wide Microwave Frequency Band

Cited by 10 publications

References 17 publications

Computationally Efficient Model for Uwb Signal Attenuation Due to Propagation in Tissue for Biomedical Implants

Computationally Efficient Model for Uwb Signal Attenuation Due to Propagation in Tissue for Biomedical Implants

Derivation of Electromagnetic Properties of Child Biological Tissues at Radio Frequencies

Broadband Complex Permittivity Measurement of Low Loss Materials Over Large Temperature Ranges by Stripline Resonator Cavity Using Segmentation Calculation Method

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