Resistive receiving and scattering antenna

Taylor, C.D.; Harrison, Charles W.; Aronson, E.A.

doi:10.1109/tap.1967.1138944

Cited by 16 publications

(6 citation statements)

References 5 publications

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“…Applying the three-term approximation conditions (k 2 a ≪ 1, h ≫ a, and k 2 h ≤ 5 4 π) [16], [17], the expression of r reduces to…”

Section: A the Induced Axial Currentmentioning

confidence: 99%

“…Applying the boundary conditions of the axial electric fields on the surface of the cylinder, the scattered axial electric field on the surface of the cylinder is related to A 2z (a, z) using the onedimensional wave equation [8], [16], [17] as…”

Section: A the Induced Axial Currentmentioning

confidence: 99%

“…An expression for I 1z (z) can be derived from (8) using the three-term approximation method [8], [16], [17] as…”

Section: A the Induced Axial Currentmentioning

confidence: 99%

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Characterizing the Human Body as a Monopole Antenna

Kibret

Teshome

Lai

2015

IEEE Trans. Antennas Propagat.

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This paper, for the first time, fully characterizes the human body as a monopole antenna in the frequency range of 10 -110 MHz, which contains the resonance frequency of the human body. The human body is represented by an equivalent cylindrical monopole antenna grounded on a highly conductive ground plane that is analysed based on the three-term approximation method. The reflection coefficient is measured using a human subject as a monopole antenna. Measurement results show that the theoretical predictions are in reasonable agreement. It is found that the human body resonates between 40 -60 MHz depending on the posture of the body when it is fed by a 50 Ω impedance system at the base of the foot. A minimum reflection coefficient of -12 dB is measured that demonstrates that the human body can be potentially used as an antenna. Theoretically, it is predicted that the human body can be an efficient antenna with a maximum radiation efficiency reaching up to 70 %, which is supported by measurement results found in the literature.

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“…Applying the three-term approximation conditions (k 2 a ≪ 1, h ≫ a, and k 2 h ≤ 5 4 π) [16], [17], the expression of r reduces to…”

Section: A the Induced Axial Currentmentioning

confidence: 99%

Section: A the Induced Axial Currentmentioning

confidence: 99%

See 1 more Smart Citation

Characterizing the Human Body as a Monopole Antenna

Kibret

Teshome

Lai

2015

IEEE Trans. Antennas Propagat.

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“…From (14) and (15), we derived approximate analytic expressions for the total axial current based on the King's three-term approximation for imperfectly conducting and loaded receiving cylindrical antenna as [17,18] I…”

Section: Induced Axial Current In the Cylindrical Modelmentioning

confidence: 99%

Human Body as Antenna and Its Effect on Human Body Communications

Kibret¹,

Teshome²,

Lai³

2014

PIER

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Abstract-Human body communication (HBC) is a promising wireless technology that uses the human body as part of the communication channel. HBC operates in the near-field of the high frequency (HF) band and in the lower frequencies of the very high frequency (VHF) band, where the electromagnetic field has the tendency to be confined inside the human body. Electromagnetic interference poses a serious reliability issue in HBC; consequently, it has been given increasing attention in regard to adapting techniques to curtail its degrading effect. Nevertheless, there is a gap in knowledge on the mechanism of HBC interference that is prompted when the human body is exposed to electromagnetic fields as well as the effect of the human body as an antenna on HBC. This paper narrows the gap by introducing the mechanisms of HBC interference caused by electromagnetic field exposure of human body. We derived analytic expressions for induced total axial current in the body and associated fields in the vicinity of the body when an imperfectly conducting cylindrical antenna model of the human body is illuminated by a vertically polarized plane wave within the 1-200 MHz frequency range. Also, fields in the vicinity of the human body model from an on-body HBC transmitter are calculated. Furthermore, conducted electromagnetic interference on externally embedded HBC receivers is also addressed. The results show that the maximum HBC gain near 50 MHz is due to whole-body resonance, and the maximum at 80 MHz is due to the resonance of the arm. Similarly, the results also suggest that the magnitude of induced axial current in the body due to electromagnetic field exposure of human body is higher near 50 MHz.

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“…Working in a cylindrical coordinate system (ρ, φ, z) with the origin on the axis and at the midsection of the cylindrical antenna model, based on Taylor et al [16], an approximate analytic expression for the total axial current can be derived as…”

Section: Whole-body Averaged Sar For An Isolated Cylindermentioning

confidence: 99%

Analysis of the Whole-Body Averaged Specific Absorption Rate (Sar) for Far-Field Exposure of an Isolated Human Body Using Cylindrical Antenna Theory

Kibret¹,

Teshome²,

Lai³

2014

PIER M

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Abstract-This study proposes an accurate estimation of whole-body averaged specific absorption rate (WBA-SAR) for far-field exposure of an isolated human body in the frequency range of 10-200 MHz based on a lossy homogenous cylindrical antenna model of the human body. Equations are derived for the total induced axial current and the whole-body averaged SAR based on a rigorous treatment of cylindrical antenna theory. An explicit formula for the resonance frequency in terms of the anatomical parameters and the dielectric properties of the body is proposed for the first time. Moreover, important phenomena in far-field radio frequency (RF) dosimetry, such as, the cause of resonance and the SAR frequency characteristics are discussed from an antenna theory perspective.

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Resistive receiving and scattering antenna

Cited by 16 publications

References 5 publications

Characterizing the Human Body as a Monopole Antenna

Characterizing the Human Body as a Monopole Antenna

Human Body as Antenna and Its Effect on Human Body Communications

Analysis of the Whole-Body Averaged Specific Absorption Rate (Sar) for Far-Field Exposure of an Isolated Human Body Using Cylindrical Antenna Theory

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