Allocations

 
U.S. Non-Federal-Government Allocations
18.6 - 18.8 GHz
EARTH EXPLORATION-SATELLITE (passive)
FIXED-SATELLITE (space-to-Earth) US255 NG164
SPACE RESEARCH (passive)


U.S. Federal Government Allocations
18.6 - 18.8 GHz
EARTH EXPLORATION-SATELLITE (passive)
FIXED-SATELLITE (space-to-Earth) US255 US334 G117
SPACE RESEARCH (passive)


ITU Region 1 Allocations
18.6 - 18.8 GHz
EARTH EXPLORATION-SATELLITE (passive)
FIXED
FIXED-SATELLITE (space-to-Earth) 5.522B
MOBILE except aeronautical mobile
Space research (passive)


ITU Region 2 Allocations
18.6 - 18.8 GHz
EARTH EXPLORATION-SATELLITE (passive)
FIXED
FIXED-SATELLITE (space-to-Earth) 5.516B 5.522B
MOBILE except aeronautical mobile
SPACE RESEARCH (passive)


ITU Region 3 Allocations
18.6 - 18.8 GHz
EARTH EXPLORATION-SATELLITE (passive)
FIXED
FIXED-SATELLITE (space-to-Earth) 5.522B
MOBILE except aeronautical mobile
Space research (passive)


SpectrumWiki


Footnotes


5.516B The following bands are identified for use by high-density applications in the fixed-satellite service:

17.3-17.7 GHz(space-to-Earth) in Region 1,
18.3-19.3 GHz(space-to-Earth) in Region 2,
19.7-20.2 GHz(space-to-Earth) in all Regions,
39.5-40 GHz(space-to-Earth) in Region 1,
40-40.5 GHz(space-to-Earth) in all Regions,
40.5-42 GHz(space-to-Earth) in Region 2,
47.5-47.9 GHz(space-to-Earth) in Region 1,
48.2-48.54 GHz(space-to-Earth) in Region 1,
49.44-50.2 GHz(space-to-Earth) in Region 1,
and
27.5-27.82 GHz(Earth-to-space) in Region 1,
28.35-28.45 GHz(Earth-to-space) in Region 2,
28.45-28.94 GHz(Earth-to-space) in all Regions,
28.94-29.1 GHz(Earth-to-space) in Region 2 and 3,
29.25-29.46 GHz(Earth-to-space) in Region 2,
29.46-30 GHz(Earth-to-space) in all Regions,
48.2-50.2 GHz(Earth-to-space) in Region 2.

This identification does not preclude the use of these bands by other fixed-satellite service applications or by other services to which these bands are allocated on a co-primary basis and does not establish priority in these Regulations among users of the bands. Administrations should take this into account when considering regulatory provisions in relation to these bands. See Resolution 143 (WRC-03).

5.522A The emissions of the fixed service and the fixed-satellite service in the band 18.6-18.8 GHz are limited to the values given in Nos. 21.5A and 21.16.2, respectively.

5.522B The use of the band 18.6-18.8 GHz by the fixed-satellite service is limited to geostationary systems and systems with an orbit of apogee greater than 20 000 km.

5.522C In the band 18.6-18.8 GHz, in Algeria, Saudi Arabia, Bahrain, Egypt, the United Arab Emirates, the Libyan Arab Jamahiriya, Jordan, Lebanon, Morocco, Oman, Qatar, the Syrian Arab Republic, Tunisia and Yemen, fixed-service systems in operation at the date of entry into force of the Final Acts of WRC-2000 are not subject to the limits of No. 21.5A.

Could not find US139

US254 In the band 18.6-18.8 GHz the fixed and mobile services shall be limited to a maximum equivalent isotropically radiated power of +35 dBW and the power delivered to the antenna shall not exceed -3 dBW.

US255 In addition to any other applicable limits, the power flux-density across the 200 MHz band 18.6-18.8 GHz produced at the surface of the Earth by emissions from a space station under assumed free-space propagation conditions shall not exceed -95 dB(W/m²) for all angles of arrival. This limit may be exceeded by up to 3 dB for no more than 5% of the time.

US334 In the band 17.8-20.2 GHz, Federal space stations in both geostationary (GSO) and non-geostationary satellite orbits (NGSO) and associated earth stations in the fixed-satellite service (space-to-Earth) may be authorized on a primary basis. For a Federal geostationary satellite network to operate on a primary basis, the space station shall be located outside the arc, measured from east to west, 70° West longitude to 120° West longitude. Coordination between Federal fixed-satellite systems and non-Federal space and terrestrial systems operating in accordance with the United States Table of Frequency Allocations is required.

  • (a) In the sub-band 17.8-19.7 GHz, the power flux-density (pfd) at the surface of the Earth produced by emissions from a Federal GSO space station or from a Federal space station in a NGSO constellation of 50 or fewer satellites, for all conditions and for all methods of modulation, shall not exceed the following values in any 1 MHz band:

    • (1) -115 dB(W/m²) for angles of arrival above the horizontal plane (δ) between 0° and 5°,
    • (2) -115 + 0.5(δ - 5) dB(W/m²) for δ between 5° and 25°, and
    • (3) -105 dB(W/m²) for δ between 25° and 90°.

  • (b) In the sub-band 17.8-19.3 GHz, the pfd at the surface of the Earth produced by emissions from a Federal space station in an NGSO constellation of 51 or more satellites, for all conditions and for all methods of modulation, shall not exceed the following values in any 1 MHz band:

    • (1) -115 - X dB(W/m²) for δ between 0° and 5°,
    • (2) -115 - X + ((10 + X)/20)(δ - 5) dB(W/m²) for δ between 5° and 25°, and
    • (3) -105 dB(W/m²) for δ between 25° and 90°; where X is defined as a function of the number of satellites, n, in an NGSO constellation as follows:
      For n ≤ 288, X = (5/119) (n - 50) dB; and
      For n > 288, X = (1/69) (n + 402) dB.


NG164 The use of the band 18.3-18.8 GHz by the fixed-satellite service (space-to-Earth) is limited to systems in the geostationary-satellite orbit.

G117 In the bands 7.25-7.75 GHz, 7.9-8.4 GHz, 17.3-17.7 GHz, 17.8-21.2 GHz, 30-31 GHz, 33-36 GHz, 39.5-41 GHz, 43.5-45.5 GHz and 50.4-51.4 GHz, the Federal fixed-satellite and mobile-satellite services are limited to military systems.

SpectrumWiki

 
ViaSat-1 Ka-band Satellite
Hughes Network Systems EchoStar XVII (Jupiter-1)
Common Carrier Fixed Point-to-Point Microwave
Other 3 billion (03b) Networks
2019 World Radiocommunication Conference (WRC-19) Agenda Item 1.5
WRC-19 Agenda Item 1.5


Related Documents, Links, and Multimedia:
Legislation (1)

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 18.6 GHz 18.7 GHz 18.8 GHz
Wavelength 1.6 cm 1.6 cm 1.6 cm
Band designator(s) SHF; K-band (IEEE) SHF; K-band (IEEE) SHF; K-band (IEEE)
Isotropic collecting area 0.2 cm2 0.2 cm2 0.2 cm2
Free space loss (1 m) 57.8 dB 57.9 dB 57.9 dB
Free space loss (1 km) 117.8 dB 117.9 dB 117.9 dB
Free space loss (10 km) 137.8 dB 137.9 dB 137.9 dB
Free space loss (100 km) 157.8 dB 157.9 dB 157.9 dB
Free space loss (1000 km) 177.8 dB 177.9 dB 177.9 dB
Free space loss
(35,786 km = GEO orbit)
208.9 dB 209.0 dB 209.0 dB
Free space loss (378,370 km = Moon) 229.4 dB 229.4 dB 229.5 dB