Human exposure

FCC ID: LDKASA-AP702

RF Exposure Info

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FCCID_2503351

Report No.: FR461329AB Appendix B. Maximum Permissible Exposure FCC ID: LDKASA-AP702 Page No. : B1 of B3

Report No.: FR461329AB 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 E (V/m) ＝ 30  P  G Power Density: Pd (W/m²) ＝ E2 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 Pd ＝ 30  P  G 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: LDKASA-AP702 Page No. : B2 of B3

Report No.: FR461329AB 1.3. Calculated Result and Limit Exposure Environment: General Population / Uncontrolled Exposure For 5GHz UNII Band: Antenna Type : PIFA Antenna Conducted Power for IEEE 802.11a: 21.22dBm Limit of Antenna Average Output Power Power Distance Directional Power Gain Density (S) Test Result (m) Gain (dBi) Density (S) (numeric) (dBm) (mW) (mW/cm²) (mW/cm²) 0.2 6.90 4.8981 21.2228 132.5190 0.129199 1 Complies Note: For 2.4GHz Band: Antenna Type : PIFA Antenna Conducted Power for IEEE 802.11g: 20.67 dBm Limit of Antenna Average Output Power Power Distance Directional Power Gain Density (S) Test Result (m) Gain (dBi) Density (S) (numeric) (dBm) (mW) (mW/cm²) (mW/cm²) 0.2 5.98 3.9631 20.6684 116.6389 0.092008 1 Complies CONCULSION: Both of the WLAN 2.4GHz Band and WLAN 5GHz Band can transmit simultaneously, the formula of calculated the MPE is: CPD1 / LPD1 + CPD2 / LPD2 + ……etc. < 1 CPD = Calculation power density LPD = Limit of power density Therefore, the worst-case situation is 0.092008 / 1 + 0.129199 / 1 = 0.221207, which is less than “1”. This confirmed that the device comply with FCC 1.1310 MPE limit. FCC ID: LDKASA-AP702 Page No. : B3 of B3


Document Created: 2015-01-16 17:38:31
Document Modified: 2015-01-16 17:38:31
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