Human Exposure

FCC ID: K7SF9K1118V2

RF Exposure Info

Download: PDF
FCCID_1969942

Report No.: FR340322 Appendix C. Maximum Permissible Exposure FCC ID: K7SF9K1118V2 Page No. : C1 of C3

Report No.: FR340322 1. Maximum Permissible Exposure 1.1. Applicable Standard 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 limit for maximum permissible exposure. In accordance with 47 CFR FCC Part 2 Subpart J, section 2.1091 this device has been defined as a mobile device whereby a distance of 0.2 m normally can be maintained between the user and the device. (A) Limits for Occupational / Controlled Exposure Averaging Time Frequency Range Electric Field Magnetic Field Power Density (S) |E|²,|H|² or S (MHz) Strength (E) (V/m) Strength (H) (A/m) (mW/ cm²) (minutes) 0.3-3.0 614 1.63 (100)* 6 3.0-30 1842 / f 4.89 / f (900 / f)* 6 30-300 61.4 0.163 1.0 6 300-1500 F/300 6 1500-100,000 5 6 (B) Limits for General Population / Uncontrolled Exposure Averaging Time Frequency Range Electric Field Magnetic Field Power Density (S) |E|²,|H|² or S (MHz) Strength (E) (V/m) Strength (H) (A/m) (mW/ cm²) (minutes) 0.3-1.34 614 1.63 (100)* 30 1.34-30 824/f 2.19/f (180/f)* 30 30-300 27.5 0.073 0.2 30 300-1500 F/1500 30 1500-100,000 1.0 30 Note: f = frequency in MHz ; *Plane-wave equivalent power density 1.2. MPE Calculation Method 30  P  G E2 E (V/m) ＝ Power Density: Pd (W/m²) ＝ d 377 E ＝ Electric field (V/m) P ＝ Average RF output power (W) G ＝ EUT Antenna numeric gain (numeric) d ＝ Separation distance between radiator and human body (m) The formula can be changed to 30  P  G Pd ＝ 377  d 2 From the EUT RF output power, the minimum mobile separation distance, d=0.2m, as well as the gain of the used antenna, the RF power density can be obtained. FCC ID: K7SF9K1118V2 Page No. : C2 of C3

Report No.: FR340322 1.3. Calculated Result and Limit For 5GHz UNII Band: Antenna Type : Dipole Antenna Max Conducted Power for IEEE 802.11ac MCS0, Nss1 80MHz : 15.81 dBm Average Average Power Density Limit of Power Antenna Antenna Gain Output Power Output Power (S) Density (S) Test Result Gain (dBi) (numeric) (dBm) (mW) (mW/cm²) (mW/cm²) 4.11 2.5763 15.8134 38.1364 0.019556 1 Complies For 5GHz ISM Band: Antenna Type : Dipole Antenna Max Conducted Power for IEEE 802.11ac MCS0, Nss1 40MHz: 28.88 dBm Average Average Power Density Limit of Power Antenna Antenna Gain Output Power Output Power (S) Density (S) Test Result Gain (dBi) (numeric) (dBm) (mW) (mW/cm²) (mW/cm²) 4.11 2.5763 28.8820 773.0373 0.396416 1 Complies For 2.4GHz Band: Antenna Type : Dipole Antenna Max Conducted Power for IEEE 802.11n 20MHz : 21.13 dBm Average Average Power Density Limit of Power Antenna Antenna Gain Output Power Output Power (S) Density (S) Test Result Gain (dBi) (numeric) (dBm) (mW) (mW/cm²) (mW/cm²) 4.60 2.8840 21.1264 129.6101 0.074403 1 Complies CONCULSION: Both of the WLAN 2.4GHz Band and WLAN 5GHz Band can transmit simultaneously, the formula of calculatedthe MPE is: CPD1 / LPD1 + CPD2 / LPD2 + ……etc. < 1 CPD = Calculation power density LPD = Limit of power density Therefore, the worst-case situation is 0.074403 / 1 + 0.396416 / 1 = 0.470819, which isless than “1”. This confirmed that the device comply with FCC 1.1310 MPE limit. FCC ID: K7SF9K1118V2 Page No. : C3 of C3


Document Created: 2013-05-03 16:22:08
Document Modified: 2013-05-03 16:22:08
© 2025 FCC.report
This site is not affiliated with or endorsed by the FCC