The information on this page is provided on an "as is" basis with no guarantees of completeness, accuracy, and usefulness. Use at your own risk.

dBm to Watts/mWatts Conversion

Formula: \(dBm = 10\log_{10} (Watts/1000)\):

dBm = X W = X mW
mW = X dBm
W = X dBm

Free-Space Path Loss (FSPL) Calculation

Formula: \(FSPL = 20\log_{10}(d) + 20\log_{10}(f) + 20\log_{10}({4\pi \over c}) \):

Distance:
Frequency:
FSPL = X dB

Parabolic Antenna Gain Calculation

Formula: \(G_{max} = 10\log_{10}\big( ({\pi*D \over \lambda})^2 * e \big) \):

Diameter:
Frequency:
Efficiency: %
Antenna Gain = X dB

Links to ITU Recommendations:

  1. ITU-R P.2109-0, Prediction of building entry loss
  2. ITU-R P.2108-0, Prediction of clutter loss
  3. ITU-R P.530-17, Propagation data and prediction methods required for the design of terrestrial line-of-sight systems
  4. ITU-R F.699-8, Reference radiation patterns for fixed wireless system antennas for use in coordination studies and interference assessment in the frequency range from 100 MHz to 86 GHz
  5. ITU-R F.1245-3, Mathematical model of average and related radiation patterns for point-to-point fixed wireless system antennas for use in interference assessment in the frequency range from 1 GHz to 86 GHz

Frequency Allocation Tables:

  1. ITU Regions
  2. FCC
  3. Europe

6 GHz Related Links:

  1. FCC 18-147, FCC Notice of Proposed Rulemaking (NPRM), 2019-10-24
  2. FCC OET Docket 18-295, Unlicensed Use of the 6 GHz Band
  3. CEPT ECC Report 302, Sharing and compatibility studies related to Wireless Access Systems including Radio Local Area Networks (WAS/RLAN) in the 5925-6425 MHz, 2019-03-29
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