RF Exposure - ZigBee

FCC ID: P27NA900B

RF Exposure Info

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FCCID_1491059

Compliance Certification Services Inc. FCC ID: P27NA900B Report No.: T110525204-RP4 APPENDIX I RADIO FREQUENCY EXPOSURE LIMIT Systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy levels in excess of the Commission's guidelines. See §15.247(i) and §1.1307(b)(1) of this chapter. EUT Specification EUT Home Monitoring Gateway Zigbee: 2405~2470MHz WLAN: 5.18GHz ~ 5.32GHz / 5.50GHz ~ 5.70GHz Frequency band (Operating) WLAN: 5.745GHz ~ 5.825GHz Bluetooth: 2.402GHz ~ 2.480 GHz Portable (<20cm separation) Device category Mobile (>20cm separation) Occupational/Controlled exposure (S = 5mW/cm2) Exposure classification General Population/Uncontrolled exposure (S=1mW/cm2) Single antenna Multiple antennas Antenna diversity Tx diversity Rx diversity Tx/Rx diversity Max. output power 6.59 dBm (4.56 mW) Antenna gain (Max) 2.91 dBi (Numeric gain: 1.95) MPE Evaluation* Evaluation applied SAR Evaluation N/A Remark: The maximum output power is 6.59dBm (4.56mW) at 2445MHz (with 1.95 numeric antenna gain.) TEST RESULTS No non-compliance noted. MPE EVALUATION Not applicable Page 41

Compliance Certification Services Inc. FCC ID: P27NA900B Report No.: T110525204-RP4 Calculation 30 × P × G E2 Given E= & S= d 3770 Where E = Field strength in Volts / meter P = Power in Watts G = Numeric antenna gain d = Distance in meters S = Power density in milliwatts / square centimeter Combining equations and re-arranging the terms to express the distance as a function of the remaining variables yields: 30 × P × G S= 3770d 2 Changing to units of mW and cm, using: P (mW) = P (W) / 1000 and d (cm) = d(m) / 100 Yields 30 × (P / 1000) × G P×G S= = 0.0796 × 2 Equation 1 3770 × (d / 100) 2 d Where d = Distance in cm P = Power in mW G = Numeric antenna gain S = Power density in mW / cm2 Maximum Permissible Exposure EUT output power = 4.56 mW Numeric Antenna gain = 1.95 Substituting the MPE safe distance using d = 20 cm into Equation 1: Yields S = 0.000199 × P × G Where P = Power in mW G = Numeric antenna gain S = Power density in mW / cm2 Æ Power density = 0.00176 mW / cm2 (For mobile or fixed location transmitters, the maximum power density is 1.0 mW/cm2 even if the calculation indicates that the power density would be larger.) Page 42


Document Created: 2011-06-23 10:33:33
Document Modified: 2011-06-23 10:33:33
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