RF Exposure

FCC ID: 2ARXI-EI185RX

RF Exposure Info

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FCCID_4098460

Shenzhen BCTC Testing Co., Ltd. FCC ID:2ARXI-EI185RX RF EXPOSURE EVALUATION 1. Introduction According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency(RF) Radiation as specified in §1.1307(b), a device is defined as a transmitting device designed to be used in other than fixed locations and to generally be used in such a way that a separation distance of at least 20 cm is normally maintained between the transmitting antenna and the body of the user or nearby persons. In this context, the term “fixed location” means that the device is physically secured at one location and is not able to be easily moved to another location. Transmitting devices designed to be used by consumers or workers that can be easily re-located, such as wireless devices associated with a personal computer, are considered to be mobile devices if they meet the 20 cm separation requirement. The limits to be used for MPE evaluation are specified in §1.1310. All unlicensed personal communications service (PCS) devices and unlicensed NII devices shall be subject to the limits for general population/uncontrolled exposure. 2.RF Radiation Exposure Limits According to 47 CFR §1.1310, the criteria listed in below table shall be used to evaluate the environmental impact of human exposure to RF radiation as specified in §1.1307(b), except in the case of portable devices which shall be evaluated according to the provisions of §2.1093. Notes: 1. f = frequency in MHz 2. Occupational/controlled limits apply in situations in which persons are exposed as a consequence of their employment provided those persons are fully aware of the potential for exposure and can exercise control over their exposure. Limits for occupational/controlled exposure also apply in situations when an individual is transient through a location where occupational/controlled limits apply provided they are made aware of the potential for exposure. 3. General population/uncontrolled exposures apply in situations in which the general public may be exposed, or in which persons that are exposed as a consequence of their employment may not be fully aware of the potential for exposure or cannot exercise control over their exposure.

Shenzhen BCTC Testing Co., Ltd. 3.MPE Assessment Method Calculations can be made to predict RF field strength and power density levels around typical RF sources. For example, in the case of a single radiating antenna, a prediction for power density in the far-field of the antenna can be made by use of the general Equations below. This equation is generally accurate in the far-field of an antenna but will over-predict power density in the near field, where they could be used for making a "worst case" or conservative prediction. Where S = Power Density, unit in mW/cm2 P = Power input to the antenna, unit in mW G = Power gain of the antenna in the direction of interest relative to an isotropic radiator R = Distance to the center of radiation of the antenna, unit in cm EIRP = Effective isotropically radiated power 4. MPE Calculation for Standalone Operations Operation Frequency: WIFI 802.11g/n HT20: 2412-2462MHz, Power density limited: 1mW/ cm2 Antenna Type: Dipole Antenna Antenna gain: 2.0dBi, R=20cm mW=10^(dBm/10) 802.11b/g/n: Power Channe conducted conducted Max Max Antenna Tune-up Evaluation result density l Freq. modulation power power tune-up power tune-up power Gain power (dBm) (mW/cm2 ) Limits (MHz) (dBm) (mW) (dBm) (mW) Numeric (mW/cm2) 2412 802.11b 11.732 14.90 11±1 12 15.85 1.585 0.004997 1 2437 802.11b 11.128 12.97 11±1 12 15.85 1.585 0.004997 1 2462 802.11b 11.964 15.72 11±1 12 15.85 1.585 0.004997 1 2412 802.11g 10.743 11.87 10±1 11 12.59 1.585 0.003969 1 2437 802.11g 10.411 10.99 10±1 11 12.59 1.585 0.003969 1 2462 802.11g 10.707 11.77 10±1 11 12.59 1.585 0.003969 1 802.11n 2412 9.450 8.81 9±1 10 10.00 1.585 0.003153 1 H20 802.11n 2437 8.828 7.63 9±1 10 10.00 1.585 0.003153 1 H20 802.11n 2462 9.234 8.38 9±1 10 10.00 1.585 0.003153 1 H20 simultaneous emission Power density Limits Calculate Evaluation Power density (mW/cm2 ) result Limits WIFI (mW/cm2 ) (mW/cm2) 0.004997 0.004997 1

Shenzhen BCTC Testing Co., Ltd. Conclusion: For the max result : 0.004997≤1.0, compliance with FCC's RF Exposure. Summary: Since the ERP (effective radiated power) operated at < 1.5 GHz is less than 1.5 watts and > 1.5 GHz is less than 3 watts, the routine environmental evaluation is not required, and the MPE result calculated for this device complies with the MPE limit as specified in 47 CFR §1.1310.


Document Created: 2018-12-03 14:25:17
Document Modified: 2018-12-03 14:25:17
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