NDLI: Estimation and reduction of power absorbed in head from handheld terminals

Content Provider	IEEE Xplore Digital Library
Author	Vaughan, R.
Copyright Year	1996
Description	Author affiliation: New Zealand Inst. for Ind. Res., Lower Hutt, New Zealand (Vaughan, R.)
Abstract	Some of the radio frequency power transmitted from typical handheld terminals is absorbed in the head. This power loss is a drain on the communications link budget which translates to reduced battery time, and also carries a perception that there could be biological ramifications. The presence of the head affects the impedance seen at the antenna port, and this effect is known to be sensitive to the geometric details and also to vary considerably between individuals. Here, single-cut pattern measurement with power integration is discussed for estimating the absorbed power. This means that the power in the single pattern cut should be proportional to the total radiated power. In practice, this is not always the case, but indicative and useful results can still be obtained. Experimental results using a phantom head are given and simple retrofit parasitic shields are shown to decrease the absorbed power.
Starting Page	301
Ending Page	304
File Size	357850
Page Count	4
File Format	PDF
ISBN	0780336925
DOI	10.1109/PIMRC.1996.567403
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-10-18
Publisher Place	Taiwan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Imaging phantoms Antenna measurements Telephone sets Impedance Biological materials In vitro Radio frequency Battery charge measurement Power measurement Dipole antennas
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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