Radio Regulations

Source: the Radio Regulations published by the International Telecommunication Union (ITU).

All IBR Recommendations

As incorporated in RR-2012

This is not the text in force. It is the version of this Recommendation that RR-2012 gave treaty-binding force, kept so that the incorporated set can be read as it stood at each conference.

See the edition in force (RR-2024)
S

Recommendation ITU-R S.672-4

Mandatory (1990-1992-1993-1995-1997)

Satellite antenna radiation pattern for use as a design objective in the fixed-satellite service employing geostationary satellites

View official text at ITU

Version history

Version evolution

The number in each cell (e.g. −9) is the Recommendation's revision number — the “-9” in ITU-R M.585-9, not a negative value. So −8 → −9 means the binding reference moved from the 8th to the 9th revision.

RR-2008 -4
RR-2012 -4
RR-2016 -4
RR-2020 -4
RR-2024 -4

Incorporated into the RR by

RR provisions, footnotes and Resolutions that incorporate this Recommendation

Provision

22.5D 22.5F

Bands and services are derived from the footnotes of the Radio Regulations as they stand, so they are shown only on the edition in force.

Scope

the use of space-station antennas with the best available radiation patterns will lead to the most efficient use of the radio-frequency spectrum and the geostationary orbit;

Recommends

  1. that for single feed circular or elliptical beam spacecraft antennas in the fixed-satellite service (FSS), the following radiation pattern should be used as a design objective, outside the coverage area:
  2. G(ψ)=Gm−3 (ψψb)αdBifor ψb≤ψ≤a ψb (1) G(ψ)=Gm+LN+20 log zdBifor a ψb<ψ≤0.5 b ψb(2a) G(ψ)=Gm+LNdBifor 0.5b ψb<ψ≤b ψb(2b) G(ψ)=X−25 log ψdBifor b ψb<ψ≤Y (3) G(ψ)=LFdBifor Y<ψ≤90°(4a) G(ψ)=LBdBifor 90°<ψ≤180°(4b)
  3. where:
  4. X = Gm + LN + 25 log (b ψb) and Y = b ψb 100.04(Gm + LN – LF)
  5. G (ψ) : gain at the angle ψ from the main beam direction (dBi)
  6. Gm : maximum gain in the main lobe (dBi)

+10 more in the full text

Source: ITU Radio Regulations, editions of 2008, 2012, 2016, 2020 and 2024. The English, French and Spanish texts are each taken from the official edition in that language, not translated from one another. Sources and citation.