MPE Calculation

FCC ID: 2ALA3-CBUASR

RF Exposure Info

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FCCID_3820373

Page 1 of 2 Casambi Technologies Oy Bertel Jungin aukio 1 E 02600 Espoo, Finland 04/13/2018 RF Exposure Considerations for the 2ALA3-CBUASR FCC ID: 2ALA3-CBUASR The FCC requires that the calculated MPE be equal to or less than a given limit dependent on frequency at a distance of 20 cm from a device to the body of a user. The transmitter operation for the 2ALA3-CBUASR covers the 2.4GHz operating band using LE Bluetooth technology The following FCC Rule Parts and procedures are applicable: Part 1.1310 – Radiofrequency radiation exposure limits Part 2.1091 – Radiofrequency radiation exposure evaluation: mobile devices KDB447498 D01 v06 Mobile and Portable Devices RF Exposure Procedures and Equipment Authorisation Policies MPE CALCULATIONS The MPE calculation used to calculate the safe operating distance for the user is: 𝑺 = 𝑬𝑰𝑹𝑷/𝟒𝝅𝑹𝟐 which can be transposed to: 𝑹= 𝑬𝑰𝑹𝑷/𝟒𝝅𝑺 Where S = Power density EIRP = Effective Isotropic Radiated Power (EIRP = P x G) P = Conducted Transmitter Power G = Antenna Gain (relative to an isotropic radiator) R = distance to the centre of radiation of the antenna (safe operating distance)

Page 2 of 2 For 2.4GHz Power Density Requirement From table 1 (b) - Limits for General Population/ Uncontrolled Exposure of FCC Rule Part 1.1310 for 2.4GHz Sreq1 = 1.0 mW/cm2 Values: Transmitter frequency range = 2400 MHz to 2480 MHz P = 0 dBm (+3 dbm) max. (2.0 mW) G = 2.0 dBi (x1.58) EIRP = 3.16 mW (= 2.0 mW x 1.58) S = 1.0 mW/cm2 Calculation: 𝑅= 3.16 𝑚𝑊/4𝜋 𝑥 1.0 𝑚𝑊/𝑐𝑚 𝑅= 3.16 𝑚𝑊/12.5664 𝑚𝑊/𝑐𝑚 𝑅 = √0.2515 𝑐𝑚 𝑹 = 𝟎. 𝟓𝟎𝟏𝟓 𝒄𝒎 Conclusion The required 20cm RF exposure limits for General Population/ Uncontrolled Exposure will not be exceeded for the 2ALA3-CBUASR using antennas having a maximum gain of 2.0 dBi.


Document Created: 2018-04-13 07:50:35
Document Modified: 2018-04-13 07:50:35
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