Human Body Impact on Uwb Antenna Radiation

Vorobyov, A.; Yarovoy, Alexander

doi:10.2528/pierm11112306

Cited by 11 publications

(11 citation statements)

References 11 publications

(11 reference statements)

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“…Shorter links are facing relatively stronger effects caused by shadowing than the longer ones. In an on-body BAN case, the human body blocks the signal propagation in certain directions depending on the location of the antenna [20]. The HL links are almost symmetrical in the measurements and have no major difference in the link distances.…”

Section: Path-loss Modelsmentioning

confidence: 83%

“…The used antennas have radiation patterns with up to 30 dB differences in total gain depending on the direction and frequency in free space [26]. The vicinity of the human body affects the radiation patterns even further [20]. The antenna pattern effect increases the effect of the human blockage phenomenon.…”

Section: Path-loss Modelsmentioning

confidence: 99%

“…In [7,12,[16][17][18][19], the effect of different antennas or polarizations on the UWB links are investigated. References [20,21] contain examination of body shapes and postures on the UWB on-body communications and in [22] the energy absorption of the UWB signal by the human body is found out.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Categorized Uwb on-Body Radio Channel Modeling for Wbans

Kumpuniemi¹,

Hämäläinen²,

Yazdandoost³

et al. 2016

PIER B

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Abstract-A categorized radio channel modeling for wireless ultra-wideband on-body body area networks is discussed. Measurements in an anechoic chamber at fourteen antenna locations are conducted in a 2-8 GHz band. The dipole and double loop antenna types are used. Six link classes are formed based on the antenna spots on the torso, head or limb. The limb-limb and the head-limb links have the lowest and highest path losses, respectively. The head-limb links have the shortest channel impulse responses (CIRs) and limb-limb links the longest ones. The CIR amplitudes follow the inverse Gaussian distribution. The tap indexes and the total excess delays are modeled with the negative binomial distribution. In most cases, the CIRs decay faster for the dipole. Otherwise no major differences exist between the antennas.

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Section: Path-loss Modelsmentioning

confidence: 83%

Section: Path-loss Modelsmentioning

confidence: 99%

See 1 more Smart Citation

Categorized Uwb on-Body Radio Channel Modeling for Wbans

Kumpuniemi¹,

Hämäläinen²,

Yazdandoost³

et al. 2016

PIER B

View full text Add to dashboard Cite

show abstract

“…Related to the latter, some examinations have been recently reported of body energy-absorption [4,5] and standing wave effect of a body [6]. Especially, the finding of Kivekäs et al in [5] is particularly interesting: peak specific absorption rate (SAR) values are not actually related to the antenna current distributions, as it has been commonly believed.…”

mentioning

confidence: 90%

Analysis of the Impedance Behaviour for Broadband Dipoles in Proximity of a Body Tissue: Approach by Using Antenna Equivalent Circuits

Tuovinen¹,

Berg²,

Iinatti³

2014

PIER B

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Abstract-Ultra wideband (UWB) antenna operation close to tissue is examined by using lumpedelement equivalent circuits in the present paper. The impact of tissue within the reactive near-field of the antenna is introduced in terms of efficiency, impedance and matching to 50 Ω. The parasitic components for the series-and parallel-resonant stages of the equivalent models are proposed for taking the impact of tissue into account on the antenna design. The first time the antenna impedance behaviour is presented in terms of capacitance, inductance and resistance as a function of the radiator distance on the tissue surface for UWB antennas. The capacitance was observed to increase with the distance on the tissue surface by achieving the maximum value close to the reactive near-field boundary. The inductance has the maximum on contact the tissue, decreasing strongly with the first millimetres and remaining constant with the higher distance. The maximum value of input resistance was seen to clearly increase with the distance, having the maximum value in the first third of the studied range, descending close to the value in free space at the boundary at the end. The results are achieved by realising electromagnetic simulations for the antennas and comparing the performance with the operation of the equivalent models.

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“…Movassaghi surveyed the WBAN and detailed its architecture classifying the antennas used based on SAR. Vorobyov and Yarovoy . A placed UWB antenna in three different locations and concluded head has the minimum blockage.…”

Section: Radiating Structuresmentioning

confidence: 99%

Investigation and reduction methods of specific absorption rate for biomedical applications: A survey

Priyadarshini

Hemanth

2017

Int J RF Microw Comput Aided Eng

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Specific Absorption Rate (SAR) is an inevitable parameter to be considered for various RF dosimetry evaluations in the field of biomedical engineering. There is a much concern in exposure studies as they have a significant impact on the social and health issues in the recent global community. SAR measures the absorption of electromagnetic radiation of RF from devices in an exposure area. The significance of SAR parameter has been awakened in broad areas of technology and even considered in the design of radiating structures from biomedical devices such as MRI to also popular mobile phones. Researchers have explicated the constant interaction of electromagnetic field interactions with biological systems. The advancements in technology pose a grave concern about the impact on human health. This paper intends to undertake an extensive survey of the various current investigations done with SAR in different scenarios with possible radiating structures and also focus on exposure areas on the human body. The SAR depends on estimation parameters that are analyzed and discussed. Further, the paper will analyze comparatively the facets of implied Methodologies in SAR computation. The parametric evaluation of SAR paves the way for a requirement reduction of SAR parameter. The paper discusses current reduction methodologies and its primary advantages and details possible setbacks. The analysis indicates a requirement of the specific radiation structure for a particular area of exposure of concern, followed by a need of ideal reduction methodology.

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Human Body Impact on Uwb Antenna Radiation

Cited by 11 publications

References 11 publications

Categorized Uwb on-Body Radio Channel Modeling for Wbans

Categorized Uwb on-Body Radio Channel Modeling for Wbans

Analysis of the Impedance Behaviour for Broadband Dipoles in Proximity of a Body Tissue: Approach by Using Antenna Equivalent Circuits

Investigation and reduction methods of specific absorption rate for biomedical applications: A survey

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