SXPCEAN2 PCI Express Half mini card WLAN module RF Exposure Info MPE calculation Phoenix Contact GmbH & Co. KG
Phoenix Contact GmbH & Co. KG PCI Express Half mini card WLAN module
Calculation: RF-Exposure for 2.4 & 5 GHz WLAN module Type identification: SX-PCEAN2 FCC ID: YG3-SXPCEAN2 Subject of Investigation According the 47CFR §2.1091 the SX-PCEAN2 from PHOENIX CONTACT Electronics GmbH (FCC ID: YG3-SXPCEAN2) has been defined as a mobile device, used in such a way that a separation distance of at least 20 cm is normally maintained between the device and the user. The human exposure to RF emissions from such devices could be evaluated based on the MPE limits adopted by the FCC for electric and magnetic field strength and / or power density. The limits for Occupational / Controlled Exposure are given in Table 1, the limits for General Population / Uncontrolled Exposure are given in Table 2. Frequency Range [MHz] Electric Field Strength (E) [V/m] Magnetic Field Power Density Strength (H) (S) [mW/cm²] [A/m] 0.3 – 3.0 614 1.63 (100)* 3.0 – 30 1842/f 4.89/f (900/f)* 30 – 300 61.4 0.163 1.0 300 – 1500 f/300 1500 – 100,000 Averaging Time |E|²,|H|² or S [min] Table 1: Limits for Occupational / Controlled Exposure. Frequency Range [MHz] Electric Field Strength (E) [V/m] Magnetic Field Strength (H) [A/m] Power Density (S) [mW/cm²] Averaging Time |E|²,|H|² or S [min] 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 Table 2: Limits for General Population / Uncontrolled Exposure. Note: f = frequency in MHz; * Plane – wave equivalent power density MPE evaluation In accordance to the CFR Part 47, §2.1091 S: Limit for power density according to CFR Part 47, §1.1310: 1 mW/cm2 P: 512.9 mW* (averaged over 30 min with both antenna ports active) G: 3.8 dBi = 2.4 (array gain for both antennas) D: Duty cycle: 100 % = 1 R: Distance in what the limit of S has to be reached: 0.2 m S= P ⋅G ⋅ D 4 ⋅π ⋅ R2 ⇒ S= 512.9mW ⋅ 2.4 ⋅ 1 mW = 0.245 2 4 ⋅ π ⋅ (20cm) cm The value for the “General population / Uncontrolled Exposure” of the power density is below the limit of CFR Part 47, §1.1310. Limits and calculated results The results for SX-PCEAN2 are given in Table 3 and based on the power measurements shown in Phoenix Testlab Report F161629E1&E2 Band CH [MHz] 2.4 GHz 2437 [cm] EIRP [dBm] EIRP [mW] Power Density [mW/cm²] Limit of Power Density [mW/cm²] Evaluation Result 20 30.9* 1230* 0.245* 1.0 Complies Table 3: Calculated results for the SX-PCEAN2 compared to the limit for uncontrolled exposure. * Including 2.5 dB maximum tune-up range The SX-PCEAN2 from PHOENIX CONTACT Electronics GmbH (FCC ID: YG3-SXPCEAN2) is in compliance with the maximum permissible exposure (MPE) limits for the Power Density given by the FCC 47CFR §1.1310 (4)(e) Table 1.
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