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Specific Absorption Rate (SAR)

  • Specific absorption rate is the measurable quantity which determines the amount of electromagnetic radiation absorbed by the human tissue when subjected to an electromagnetic field.
  • Most of the IoT devices and advanced cellular technologies are being used in close proximity to the human body. Any wireless device operating within 20cm from the body with a threshold power must undergo SAR testing.
  • Excessive exposure to radio frequency (RF) energy can damage human tissue. To prevent this, many countries around the world have introduced standards that limit the amount of RF exposure allowed from transmitters of all types.
  • RF exposure is evaluated using a “phantom” that simulates the electrical characteristics of the human head or body. The RF energy penetrating the “phantom” is monitored by precisely positioned probes that measure SAR in watts per kilogram of tissue.
  • In the United States, the FCC regulates SAR under 47 CFR Part 2, section 2.1093. Products intended for general use must meet a SAR limit of 1.6 mW/g averaged over one gram of tissue in any part of the head or body, and 4 mW/g averaged over 10 grams for hands, wrists, feet and ankles.
  • In the European Union, RF exposure limits have been established by Council Recommendation 1999/519/EC. Harmonized standards cover the most common products such as cell phones and RFID devices. The limits and methods of RF exposure evaluation in the EU are similar but not identical to those in the US.
  • The SAR Laboratory of Bharat Test House is capable of making SAR measurement for Wireless products such as Wi-Fi, Bluetooth, ZigBee, RFID etc. and Cellular technologies such as GSM 2G and UMTS 3G and LTE mobile handsets in the frequency band of 800 MHz, 900 MHz, 1800 MHz and 2100 MHz in terms of IEEE standard based Test Procedure as per on International Electro-technical Commission (IEC) standard 62209-1 and 62209-2.
  • Bharat Test House can help the customers to determine if their product meets those requirements and perform the required testing for a variety of portable and mobile telecommunications equipment. Bharat Test House is one of the few organizations capable of testing and certifying products related to RF exposure standards, as well as electrical safety standards.