Editing Ultra high frequency (section)

{{redirect|UHF}}
{{Short description|Electromagnetic spectrum 300–3000 MHz}}

{{MWband
| name = Ultra high frequency (ITU)
| freq = 300 [[Hertz|MHz]] to 3 [[Hertz|GHz]]
| wave = 1 [[Meter|m]] to 1 [[Decimetre|dm]]
| bands = {{startplainlist|class=nowrap}}
* [[B band (NATO)|B]]{{\}}[[C band (NATO)|C]]{{\}}[[D band (NATO)|D]]{{\}}[[E band (NATO)|E band]]s (NATO)
* UHF and [[L band#IEEE L band|L]]{{\}}[[S band]]s (IEEE)
{{endplainlist}}
| name2 = Ultra high frequency (IEEE)
| freq2 = 300 MHz to 1 GHz
| wave2 = 1 m to 3 dm
| bands2 = {{startplainlist|class=nowrap}}
* UHF (ITU)
* [[B band|B]]{{\}}[[C band (NATO)|C band]]s (NATO)
{{endplainlist}}
}}

'''Ultra high frequency''' ('''UHF''') is the [[ITU]] designation<ref name="1037B">{{cite book | title = US Federal Standard 1037B: Telecommunications, Glossary of Telecommunications Terms | publisher = Office of Technology Standards, General Services Administration | date = 3 June 1991 | pages = S-18 | url = https://books.google.com/books?id=zYLXU4fkD34C&pg=RA15-PA18}}</ref><ref name="itu-2015-acts">{{cite conference |date=2015 |title=Final Acts WRC-15 |url=https://www.itu.int/dms_pub/itu-r/opb/act/R-ACT-WRC.12-2015-PDF-E.pdf |conference=World Radiocommunication Conference |location=Geneva, Switzerland |publisher=International Telecommunications Union |pages = 4|access-date=2025-01-12}}</ref> for [[radio frequency|radio frequencies]] in the range between 300&nbsp;[[megahertz]] (MHz) and 3&nbsp;[[gigahertz]] (GHz), also known as the '''decimetre band''' as the wavelengths range from one meter to one tenth of a meter (one [[decimetre]]). Radio waves with frequencies above the UHF band fall into the [[super-high frequency]] (SHF) or [[microwave]] frequency range. Lower frequency signals fall into the VHF ([[very high frequency]]) or lower bands. UHF radio waves propagate mainly by [[Line-of-sight propagation|line of sight]]; they are blocked by hills and large buildings although the transmission through building walls is strong enough for indoor reception. They are used for [[UHF television broadcasting|television broadcasting]], [[cell phones]], satellite communication including [[GPS]], [[personal radio service]]s including [[Wi-Fi]] and [[Bluetooth]], [[walkie-talkie]]s, [[cordless phone]]s, [[satellite phone]]s, and numerous other applications.

The [[Institute of Electrical and Electronics Engineers|IEEE]] defines the UHF [[Radio spectrum#IEEE|radar band]] as frequencies between 300&nbsp;MHz and 1&nbsp;GHz.<ref name=ieee>{{cite web|url=https://standards.ieee.org/ieee/521/768/|title=IEEE 521-2002 - IEEE Standard Letter Designations for Radar-Frequency Bands|website=[[IEEE]]|access-date=17 December 2017}}</ref> Two other IEEE radar bands overlap the ITU UHF band: the [[L band]] between 1 and 2&nbsp;GHz and the [[S band]] between 2 and 4&nbsp;GHz.

[[File:UHF TV Antenna 001.JPG|thumb|UHF [[television antenna]] on a residence. This type of antenna, called a [[Yagi–Uda antenna]], is widely used at UHF frequencies.]]