RF Exposure

FCC ID: SBRFL8310

RF Exposure Info

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FCCID_628726

Power Density Calculation

Ssurface
2
G (dB) D (m) A (m ) P (W)* (w/m2) Rnf (m) Snfmax (w/m2) Rff (m) St max(w/m2) Sff(w/m2)
1' Panel 23.9 0.4310 0.0929 0.050 2.1528 0.8978 1.3708 2.1434 0.6153 0.1952

2' parabolic 30.1 0.6096 0.2917 0.050 0.6856 1.7961 0.6853 4.2878 0.6154 0.1602
4' parabolic 35.3 1.2192 1.1669 0.050 0.1714 7.1845 0.1713 17.1513 0.1713 0.0349
6' parabolic 38.1 1.8288 2.6254 0.050 0.0762 16.1651 0.0761 38.5905 0.0761 0.0167

Where:
G: antenna gain
D: antenna diameter in meters, for panel antenna, D = 1.414x the side length of the antenna
P: radio output power fed into the antenna
A: physical area of the aperture antenna
Ssurface: maximum power density at the antenna surface, S surface = 4P/A

Rnf: extent of near field, R nf = D2/4λ, where λ is wavelength, at 5.8GHz, λ=0.052m;
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Snfmax: maximum near field power density, S nf = 16ηP/πD2; for worst case situation, η is assmumed to be 1

Rff: distance to beginning of far field; R ff= 0.6D2/λ
St max: maximum powre density in the transition region; S t max=Snf *Rnf/Rmin; where Rmin = min (2m, R nf)
Sff: far field power density (on axis); S ff = PG/4πR2

Note: Power density beyond 2m from the center of antenna must be within 10W/m 2 or 1mW/cm 2

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Document Created: 2006-02-09 21:00:42
Document Modified: 2006-02-09 21:00:42

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