MPE

FCC ID: VYTLP-9287C

RF Exposure Info

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FCCID_1231095

程智科技股份有限公司 Compliance Certification Services Inc. RADIO FREQUENCY EXPOSURE LIMIT According to §15.247(i), 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 § 1.1307(b)(1) of this chapter. EUT Specification EUT High Power 802.11g Wireless USB Adapter WLAN: 2.412GHz ~ 2.462GHz Frequency band WLAN: 5.18GHz ~ 5.32GHz / 5.50GHz ~ 5.70GHz (Operating) WLAN: 5.745GHz ~ 5.825GHz Others Portable (<20cm separation) Device category Mobile (>20cm separation) Others 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 IEEE 802.11b: 9.15 dBm (8.22mW) Max. output power IEEE 802.11g: 17.18 dBm (52.24mW) PIFA Antenna / Gain: 13.41dBi (Numeric gain: 21.92) Antenna gain (Max) Dipole Antenna / Gain: 5dBi (Numeric gain: 3.16) MPE Evaluation Evaluation applied SAR Evaluation N/A Remark: 1. The maximum output power is 17.18dBm (52.24mW) at 2437MHz (with 21.92 numeric antenna gain.) DTS device is not subject to routine RF evaluation; MPE estimate is used to justify the compliance. 2. For mobile or fixed location transmitters, no SAR consideration applied. The maximum power density is 1.0 mW/cm2 even if the calculation indicates that the power density would be larger. TEST RESULTS No non-compliance noted.

程智科技股份有限公司 Compliance Certification Services Inc. 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 × Equation 1 3770 × (d / 100 ) 2 d2 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 = 52.24mW Numeric Antenna gain = 21.92 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 = 0.228 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.)


Document Created: 2010-01-18 14:30:18
Document Modified: 2010-01-18 14:30:18
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