Threshold Power of Canonical Antennas for Inducing SAR at Compliance Limits in the 300–3000 MHz Frequency Range

Ali, Mohd. Hasan; Douglas, Mark; Sayem, A.T.M.; Faraone, A.; Chou, Chung‐Kwang

doi:10.1109/temc.2006.888178

Cited by 14 publications

(9 citation statements)

References 33 publications

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“…Efficiency values for these antennas are similar. This is expected, as the radiating characteristics of these three antennas are similar, resulting in similar levels of absorbed power in the phantom (linear and meander dipole results exhibit the same behavior in [10]). …”

Section: ) Dipole Antennasmentioning

confidence: 56%

“…XFDTD was also used for SAR calculations of the dipole antennas. In an earlier paper [10], the XFDTD models were validated against the half-wave dipole data presented in IEEE Standard 1528-2003 [36]. In this paper, we used the Liao absorbing boundary condition (ABC) to save computation time.…”

Section: B Computational Techniquesmentioning

confidence: 99%

“…In a previous paper, the authors defined a quantity called the threshold power, P th,m , [10] which represents the antenna transmit power at which the peak spatial-averaged SAR has reached the applicable SAR limit. Thus, according to [10, eq.…”

Section: A Bandwidth Efficiency and Threshold Powermentioning

confidence: 99%

“…This simple threshold does not take into account parameters such as frequency, distance, or bandwidth. In addition, it assumes that all of the power is absorbed in the 10-g tissue mass and none is used for communication, as explained in [10]. In the literature, there has been considerable research on antennas and SAR.…”

mentioning

confidence: 99%

“…Due to the expense of measurements and numerical modeling, developing this relationship can lead to much easier and cost-effective estimates of SAR for portable wireless devices. Recently, the authors investigated such a relationship for linear wire dipole antennas [10]. The paper defined a minimum threshold power level below which the SAR cannot exceed the SAR limit.…”

mentioning

confidence: 99%

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Correlating Threshold Power With Free-Space Bandwidth for Low-Directivity Antennas

Sayem

Douglas

Schmid

et al. 2009

IEEE Trans. Electromagn. Compat.

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Abstract-This paper develops a threshold power rationale that can be used to demonstrate inherent compliance for portable wireless devices with specific absorption rate (SAR) limits over the 300-6000-MHz frequency range. This is achieved first by understanding the relationship between basic antenna parameters (bandwidth, operating frequency, and distance to the body) and SAR. From this, an upper limit is determined for the power transmitted by a portable wireless device such that the SAR will not exceed the compliance limit. Based on the presented computational and measured data, an empirical formula is developed for the threshold power as a function of the aforementioned parameters. It is demonstrated that the derived threshold power is conservative for all of the lowdirectivity antennas studied. Computed results are also compared against practical device data (mobile telephone data collected from the manufacturers) to show that the predicted threshold power data using the proposed formula are conservative. The limitations of the proposed formula are also discussed.Index Terms-Antenna measurements, antennas, electromagnetic propagation in absorbing media, numerical analysis.

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Section: ) Dipole Antennasmentioning

confidence: 56%

Section: B Computational Techniquesmentioning

confidence: 99%

Section: A Bandwidth Efficiency and Threshold Powermentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Correlating Threshold Power With Free-Space Bandwidth for Low-Directivity Antennas

Sayem

Douglas

Schmid

et al. 2009

IEEE Trans. Electromagn. Compat.

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Effect of the presence of a brain tumor on electromagnetic power absorption in the head of a cellular phone user

Cavagnaro¹,

Bernardi²,

Pisa³

et al. 2010

Micro & Optical Tech Letters

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A pilot numerical study is conducted to investigate whether a tumor located in the outermost layers of the brain is able to change power absorption and temperature increase in the head, when exposed to the field radiated by a cellular phone. Results show that absorption into the head tissues different from the tumor is barely affected by its presence. On the other hand, inside the tumor, tumor dielectric properties highly influence electromagnetic power absorption, while temperature increments are mainly affected by tumor thermal properties rather than dielectric properties. (C) 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1264-1267,2010; Published online its Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.2515

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Dosimetry and Temperature Aspects of Mobile-Phone Exposures

Bernardi

Pisa

Cavagnaro

et al. 2009

Advances in Electromagnetic Fields in Living Systems

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Threshold Power of Canonical Antennas for Inducing SAR at Compliance Limits in the 300–3000 MHz Frequency Range

Cited by 14 publications

References 33 publications

Correlating Threshold Power With Free-Space Bandwidth for Low-Directivity Antennas

Correlating Threshold Power With Free-Space Bandwidth for Low-Directivity Antennas

Effect of the presence of a brain tumor on electromagnetic power absorption in the head of a cellular phone user

Dosimetry and Temperature Aspects of Mobile-Phone Exposures

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