4What is SAR?? SAR - Specific Absorption Rate It is an indication of the amount of radiation that is absorbed into a head whilst using a cellular phoneA SAR value is a measure of the maximum energy absorbed by a unit of mass of exposed tissue.Units = watts per kilogram (W/kg)
5Definition of SAR Definition of SAR: Ei : rms value of the electric field strength in the tissue in V/mσ : Conductivity of body tissue in Kg/m3Ci : heat capacity of body tissue in J/Kg K: derivative of temperature in body tissue in K/s
6Preparation - Laboratory 15˚c - 30˚c ±2˚cNo interact with local networkBe aware of ambient EM sourcesBe aware of reflection from environmentValidationAt least once a year
7Preparation - Mobile battery must be Fully charged So that, the worst case (maximum power) obtainedAt least 50cm between emulator antenna and the mobile1‰ or less power from the antenna with respect to the mobile
8Hardware System Overview Change 2x9V batteries every 16 hoursxzyIndicationBoardAmplifier3 channels DVM with DAQ cardSerial Ports: COM1, COM2, COM3Position ControllerGPIB to grab the data from the DVMFlat phantomLeft headRight head
9Tests to be performed Cheek and tilted Left and right sides of the headCenter frequency of each bandRetractable antennaExtendedRetractedMulti-mode/multi-bandPerformed in each mode with max power
10Test Setup Mobile phone operating at the maximum power level Phone holder described positions at a shell phantom of a human being
11Test SetupProbes with high sensitivity and low field disturbance are usedMove along X-axis, Y-axis, Z-axis
12Test setupElectric field strength E is measured in the tissue simulating liquidTissue simulation liquid:Dielectric properties900MHz: 64.81% 1,2-propanediol; 34.4% de-ionized water; 0.79 NaCl salt
13Phantom RequirementsThe phantom is a simplified representation of the human anatomy and comprised of material with electrical properties similar to the corresponding tissues. The physical characteristics of the phantom model shall resemble the head and the neck of a user since the shape is a dominant parameter for exposure.
14Phantom Requirements Shape is a dominant parameter for exposure. 90% large adult male study by anthropomorphic study in 1989Fill with tissue simulating liquid through head to neck
29Definition of SAR Definition of SAR: Ei : rms value of the electric field strength in the tissue in V/mσ : Conductivity of body tissue in Kg/m3Ci : heat capacity of body tissue in J/Kg K: derivative of temperature in body tissue in K/s
30Quantization Having in mind a worst case consideration, the SAR limit is valid for uncontrolled environment mobile respectively portable transmitters.StandardMax allowable limitICNIRP2 watt/kgANSI / IEEE1.6 watt/kg
31The SAR values of your mobile phone may be found from the following website
32SAR values of some models ManufacturerModelSAR valuesMotorolaV800.54V6000.82E3981.01Sony EricssonK500i0.53K7000.48P9000.91T6300.88NokiaN-Gauge0.5772000.3676000.71SamsungSGH-E8000.32.