Meaning
Establishes the regulatory maximum threshold for radiofrequency energy deposition in human head and torso tissue from mobile transmitters. Adherence to the 1g sar limit ensures that radiofrequency power absorbed by one gram of tissue does not exceed one point six watts per kilogram under maximum operational power. This threshold governs portable transmitters operating within twenty centimeters of a user body.
Devices failing this metric cannot obtain commercial market authorization.
Regulatory Threshold
Mass averaging across a single gram of tissue isolates peak energy concentration near radiating antenna structures. The 1g sar limit applies to mobile phones, body-worn sensors and tablet computers. Regulatory bodies enforce this ceiling to prevent localized tissue heating.
Measurement Validation
Laboratory verification uses automated robot arms equipped with isotropic E-field probes inside standardized head and flat phantoms. Spatial scanning identifies peak absorption regions within the phantom liquid. Interpolation algorithms calculate localized spatial-peak energy density over a one-gram tissue cube.
If measured transmitter output falls below nominal target levels, mathematical scaling adjusts the raw result to account for maximum tune-up tolerances. The calculated 1g sar limit value determines compliance in final certification filings.
Certification Handover
Test report data transfers directly to telecommunication certification bodies during device approval workflows. Measured values approaching the regulatory ceiling require reduced transmitter output power or modified antenna matching circuits. Final equipment authorization relies on verified test reports proving compliance under all simultaneous transmission configurations.
