Discussion
What is specific absorption rate?
Answer: B
Specific absorption rate measures how much radiofrequency power is deposited per kilogram of tissue, and exposure limits are written in those terms. Handset antennas are designed and placed to keep it within the limit, which sometimes conflicts with radiation efficiency. Moisture uptake, conductor loss and receiving aperture are quite different quantities. A regulatory limit expressed in terms of an effect on the user, rather than on the equipment, constrains design in ways that purely electrical specifications do not.
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