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Portable wireless devices used in close proximity to the human body have transmitter power constraints that are dictated in part by regulatory limits on a form of electromagnetic exposure called specific absorption rate (SAR). SAR, measured in Watts per kilogram, is a measure of electromagnetic energy absorption by the body, which can cause the heating of tissue. Some portable wireless devices sold...
Portable devices sold around the world number in the billions, and they are used daily because of their ability to provide connectivity by integrating processing power, touch screens, cameras, and motion sensors with multiple radios. Many of the radios can run simultaneously, and each radio exposes the user to some level of electromagnetic radiation. The exposure levels are potentially cumulative...
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