Attachment Exhibit B. C-band r

This document pretains to SES-LIC-20130918-00810 for License on a Satellite Earth Station filing.

IBFS_SESLIC2013091800810_1013005

Exhibit B. C-band Radiation Hazard Study. D(Antenna size in m): 4.5 Ga (Antenna gain in dBi): 46.4 dBi @ 6.425 GHz G (Numeric antenna gain): 43651.58 P (HPA power output in W): 61.7 ERP (W): 2693302.68 f (midband frequency in MHz): 6205 C(velocity of radio waves in cm/sec): 300*10^8 A. Antenna surface max. power density: Ssurface: =4*P/A Where: P= power fed into the antenna A= physical area of the aperture antenna= πr² A(cm²)= 159043.13 Ssurface (mW/cm²)= 1.55 B. Near field calculations: Rnf= extent of near field in cm= D²/(4*λ) Where: D= maximum dimension of antenna (dia. If circular) λ= wavelength λ (cm)= C/f λ (cm)= 4.83 Rnf (cm): 10470.94 Max. value of the near field power density Snf= 16*η*P/(π)*D² Where: η= aperture efficiency= (Gλ²/4π)/(πD²/4) G= power gain in the direction of interest relative to an isotropic radiator λ= wavelength D= antenna diameter η= 0.51 Snf (mW/cm²): 0.79 C. Far field calculations: Rff= distance to beginning of far field=0.6*D²/λ Where: D= maximum dimension of antenna (dia. If circular) λ= wavelength Rff (cm)= 25130.25 Sff= On-axis Power density in the far field region= (P*G)/(4πR²) Sff (mW/cm²)= 0.34 D. Conclusion: The proposed C-band uplink system meets the maximum permissible exposure limits (MPE) (1 mW/cm²) for the General population/uncontrolled exposure as specified in the FCC document #OET bulletin 65 for satellite communications. The above calculations are based on on-axis power densities and are already meeting the maximum required MPE. Since the off-axis power density is referenced at ground level, it will be considerably lower than the calculated on-axis power density due to the discrimination provided by the antenna.


Document Created: 2011-04-07 10:06:17
Document Modified: 2011-04-07 10:06:17
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