Question
What does SAR measure?
Answer Options
- A) Signal attenuation ratio
- B) Signal amplification rating
- C) The rate at which RF energy is absorbed by the body
- D) The rate of RF energy reflected from stationary terrain
Correct Answer: C
Explanation
SAR (Specific Absorption Rate) is a technical metric used in \text{RF} safety compliance to quantify the thermal interaction between a radio transmitter and biological tissue. It is a refinement of the basic Maximum Permissible Exposure (\text{MPE}) concept.
SAR measures The rate at which \text{RF} energy is absorbed by the body. It is typically expressed in units of Watts per kilogram (\text{W/kg}). For handheld or body-worn transmitters, \text{SAR} testing is mandatory, as it ensures that the localized heating of human tissue (the primary biological hazard of \text{RF} exposure) remains below the safety limits established by the \text{FCC}.
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