Investigation of Creeping Wave Propagation Around the Human Head at ISM Frequencies

Bresnahan, Drew; Li, Yang

doi:10.1109/lawp.2017.2745461

Cited by 18 publications

(5 citation statements)

References 11 publications

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“…The hand performs better in NLOS because the space of 20 cm from the chest as illustrated in Fig. 6d allows the wave to reach the TAG easily through creeping wave propagation [32].…”

Section: B Ranging Along a Straight Pathmentioning

confidence: 99%

Impact of Body Wearable Sensor Positions on UWB Ranging

et al. 2019

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“…The hand performs better in NLOS because the space of 20 cm from the chest as illustrated in Fig. 6d allows the wave to reach the TAG easily through creeping wave propagation [32].…”

Section: B Ranging Along a Straight Pathmentioning

confidence: 99%

Impact of Body Wearable Sensor Positions on UWB Ranging

et al. 2019

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“…Mobile computing platforms [41] have improved the user experience and usability of binaural hearing aid systems. In most cases, the hearing aids in each ear communicate through a 2.45 GHz wireless communication (2.45 GHz WC) system [42][43][44]. However, as the communication signals are 2.45 GHz electromagnetic waves, they are significantly absorbed by the biological tissues of the head [45].…”

Section: Proposed Hbc Systemmentioning

confidence: 99%

Transmission Analysis in Human Body Communication for Head-Mounted Wearable Devices

Muramatsu

Sasaki

2021

Electronics

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As society ages, wireless body area networks (WBANs) are expected to increasingly improve the quality of life of the elderly and disabled. One promising WBAN technology is human body communication (HBC), which utilizes part of the human body as a transmission medium. Communication between head-mounted wearable devices, such as hearing aids, is a potential HBC application. To clarify the HBC transmission mechanism between head-mounted wearable devices, this study analyzes the input impedance characteristics of the transceiver electrodes, transmission characteristics, and electric field distributions around and through a detailed head model. The investigation was performed via an electromagnetic field simulation. The signal frequency had less effect on the transmission characteristics and electric field distributions at 10, 20, and 30 MHz. However, the transmission mechanism between the head-mounted wearable devices was influenced by the number of electrodes in the transceiver. Moreover, the transmission characteristics between two-electrode transceivers were improved by impedance matching. Finally, the availability of the proposed system was evaluated from power consumption and human safety perspectives.

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“…For this model, the human torso was modelled as a homogeneous cylinder of radius 15 cm and height 40 cm filled with tissue properties equivalent to muscle [15]. Previous studies have shown that a homogeneous cylinder model filled with muscle or 2/3 muscle can be a good representation of a real human torso for OB2OB propagation research [3,4,6].…”

Section: Ob2ob Wave Propagation and Antenna Excitationmentioning

confidence: 99%

“…Two dominant on-body channel propagation mechanisms have been identified: ground waves for the line-ofsight (LOS) propagation and creeping waves for the non-LOS (NLOS) propagation [1]. The creeping wave propagation experiences exponential decay and its propagation characteristics have been studied using full-wave simulations [2], theoretical formulation [3], and in-situ experimental trials [4]. Ryckaert et al [2] first reported the creeping wave mechanism by collecting electric field distributions around a human phantom model using a finite-difference time-domain (FDTD) simulation approach.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Dominant Wave Mechanism and Optimal Antenna Excitation for Body-Centric Wireless Propagations

Agu¹,

Leece²,

Alcala-Medel³

et al. 2020

PIER C

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Vertically-and horizontally-polarized antennas were investigated for on-body to on-body (OB2OB), in-body to in-body (IB2IB), and on-body to in-body (OB2IB) wireless propagations at frequencies of 915 MHz and 2.45 GHz. Theoretical formulations, simulations, and measurements were employed to study the effect of source antenna orientation on the attenuation of the radio frequency (RF) wave as it propagates around, inside, and through the body near the torso region. The results show that the vertical polarization is preferred for OB2OB communication, and the horizontal polarization is better for IB2IB communication. Furthermore, the dominant propagation mechanism and optimum antenna excitation for OB2IB communication are identified to be distance-dependent. The horizontallypolarized dipole is preferred at a shorter distance while the vertically-polarized dipole is preferred at a larger distance away from the source. The observed results were explained using the estimated attenuation rates of the different propagation mechanisms.

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Investigation of Creeping Wave Propagation Around the Human Head at ISM Frequencies

Cited by 18 publications

References 11 publications

Impact of Body Wearable Sensor Positions on UWB Ranging

Impact of Body Wearable Sensor Positions on UWB Ranging

Transmission Analysis in Human Body Communication for Head-Mounted Wearable Devices

Investigation of Dominant Wave Mechanism and Optimal Antenna Excitation for Body-Centric Wireless Propagations

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