Editing Extremely high frequency (section)

=== Telecommunications ===
In the United States, the band 36.0–40.0&nbsp;GHz is used for licensed high-speed microwave data links, and the 60&nbsp;GHz band can be used for unlicensed short range (1.7&nbsp;km) data links with data throughputs up to 2.5 [[gigabit|Gbit]]/s. It is used commonly in flat terrain.

The 71–76, 81–86 and 92–95&nbsp;GHz bands are also used for [[point-to-point (telecommunications)|point-to-point]] high-bandwidth communication links. These higher frequencies do not suffer from oxygen absorption, but require a transmitting license in the US from the [[Federal Communications Commission]] (FCC). There are plans for 10&nbsp;Gbit/s links using these frequencies as well. In the case of the 92–95&nbsp;GHz band, a small 100&nbsp;MHz range has been reserved for space-borne radios, limiting this reserved range to a transmission rate of under a few gigabits per second.<ref>[http://rfdesign.com/mag/605RFDF4.pdf Rfdesign.com] {{Webarchive|url=https://web.archive.org/web/20120716154135/http://rfdesign.com/mag/605RFDF4.pdf |date=2012-07-16 }}, Multigigabit wireless technology at 70&nbsp;GHz, 80&nbsp;GHz and 90&nbsp;GHz, [[RF Design]], May 2006</ref>

[[File:CableFree MMW Link installed in UAE.jpg|thumb|A CableFree MMW link installed in the UAE installed for [[Safe City]] applications, providing 1&nbsp;Gbit/s capacity between sites. The links are fast to deploy and have a lower cost than fibre optics.]]

The band is essentially undeveloped and available for use in a broad range of new products and services, including high-speed, point-to-point wireless local area networks and broadband [[Internet access]]. [[WirelessHD]] is another recent technology that operates near the 60&nbsp;GHz range. Highly directional, "pencil-beam" signal characteristics permit different systems to operate close to one another without causing interference. Potential applications include [[radar]] systems with very high resolution.

The [[Wi-Fi]] standards [[IEEE 802.11ad]] and [[IEEE 802.11ay]] operate in the 60&nbsp;GHz ([[V band]]) spectrum to achieve data transfer rates as high as 7 [[Gigabit|Gbit/s]] and at least 20 [[Gigabit|Gbit/s]], respectively.

Uses of the millimeter wave bands include point-to-point communications, [[Inter-satellite service|intersatellite links]], and [[point-to-multipoint communication]]s. In 2013 it was speculated that there were plans to use millimeter waves in future [[5G]] mobile phones.<ref>{{Cite journal|title = Millimeter Wave Mobile Communications for 5G Cellular: It Will Work! |journal = IEEE Access |date = 2013-01-01 |issn = 2169-3536 |pages = 335–349 |volume = 1 |doi = 10.1109/ACCESS.2013.2260813 |first1 = T.S. |last1 = Rappaport |first2 = Shu |last2 = Sun |first3 = R. |last3 = Mayzus |first4 = Hang |last4 = Zhao |first5 = Y. |last5 = Azar |first6 = K. |last6 = Wang |first7 = G.N. |last7 = Wong |first8 = J.K. |last8 = Schulz |first9 = M. |last9 = Samimi|doi-access = free |bibcode = 2013IEEEA...1..335R }}</ref> In addition, use of millimeter wave bands for vehicular communication is also emerging as an attractive solution to support (semi-)autonomous vehicular communications.<ref>{{Cite journal|title = FML: Fast Machine Learning for 5G mmWave Vehicular Communications |url = https://www.researchgate.net/publication/324804467 |journal = IEEE Infocom'18 |date = 2018-04-15 |first1 = Arash |last1 = Asadi |first2 = Sabrina |last2 = Klos |first3 = Gek Hong |last3 = Sim |first4 = Anja |last4 = Klein |first5 = Matthias |last5 = Hollick}}</ref>

Shorter wavelengths in this band permit the use of smaller antennas to achieve the same high directivity and high gain as larger ones in lower bands. The immediate consequence of this high directivity, coupled with the high free space loss at these frequencies, is the possibility of a more efficient use of frequencies for point-to-multipoint applications. Since a greater number of highly directive antennas can be placed in a given area, the net result is greater  [[frequency reuse]], and higher density of users. The high usable [[channel capacity]] in this band might allow it to serve some applications that would otherwise use [[fiber-optic communication]] or very short links such as for the interconnect of circuit boards.<ref>{{cite journal |author=Peter Smulders | title=The Road to 100 Gb/s Wireless and Beyond: Basic Issues and Key Directions | journal=IEEE Communications Magazine | volume=51 | issue=12 | pages=86–91 | year=2013 | doi=10.1109/MCOM.2013.6685762| s2cid=12358456 }}</ref>