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SAR Compliance Boundary
Meaning
Geometric limit defining the minimum safe distance between a radio transmitting device and the human body. This perimeter is established through testing that measures how much radio frequency energy the body absorbs. A sar compliance boundary ensures that the specific absorption rate remains below the maximum levels set by health and safety authorities.
Separation Distance
Physical spacing acts as the primary tool for reducing energy exposure to the user. Engineers calculate the sar compliance boundary based on the maximum output power of the radio module and the gain of the antenna. In many mobile devices, this distance is only a few millimeters, while high power industrial nodes require several centimeters.
Exposure Rating
Laboratory measurements use a human phantom filled with liquid that mimics the electrical properties of tissue. The sar compliance boundary is the point where the absorbed power per unit of mass stays within legal tolerances during a worst case transmission scenario. This rating is critical for devices held against the ear or worn on the wrist.
Integration Barrier
Mechanical designers must account for this safety zone when placing a module inside a product shell. If the sar compliance boundary extends beyond the surface of the device, the firmware must include sensors that reduce power when a person is detected nearby. The boundary determines the final shape and usability of the hardware.