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S band
The S band is a designation by the Institute of Electrical and Electronics Engineers (IEEE) for a part of the microwave band of the electromagnetic spectrum covering frequencies from 2 to 4 gigahertz (GHz). Thus it crosses the conventional boundary between the UHF and SHF bands at 3.0 GHz. The S band is used by airport surveillance radar for air traffic control, weather radar, surface ship radar, and some communications satellites, particularly satellites used by NASA to communicate with the Space Shuttle and the International Space Station. The 10 cm radar short-band ranges roughly from 1.55 to 5.2 GHz. India's regional satellite navigation network (IRNSS) broadcasts on 2.483778 to 2.500278 GHz.
The S band also contains the 2.4–2.483 GHz ISM band, widely used for low power unlicensed microwave devices such as cordless phones, wireless headphones (Bluetooth), garage door openers, keyless vehicle locks, baby monitors as well as for medical diathermy machines and microwave ovens (typically at 2.495 GHz). One of its largest uses is 2.4 GHz IEEE 802.11 Wi-Fi wireless networks, allowing smartphones, laptops, printers and TVs to connect to the internet without cables.
The largest use of this band is by Wi-Fi networks; the IEEE 802.11b and 802.11g standards use the 2.4 GHz section of the S band. These are the most widely used computer networks in the world, used globally in home and small office networks to link desktop and laptop computers, tablet computers, smartphones, smart TVs, printers, and smart speakers together and to a wireless router to connect them to the Internet, and in wireless access points in public places like coffee shops, hotels, libraries and airports to provide public Internet access for mobile devices.
Mobile services are operated in the 2.3 GHz to 2.6 GHz range, specifically between the 2300–2400 MHz band and the 2500–2690 MHz band. Spectrum in the 3.55–3.7 GHz band has been auctioned off in the United States to be used for CBRS services and spectrum between 3.45–3.55 GHz and 3.7–3.98 GHz has been auctioned off by the FCC for 5G although this spectrum is referred to as C Band by the agency.
In the United States, the FCC approved satellite-based Digital Audio Radio Service (DARS) broadcasting in the S band from 2.31 to 2.36 GHz in 1995, used by Sirius XM Radio. More recently, it has approved portions of the S band between 2.0 and 2.2 GHz for the creation of Mobile Satellite Service (MSS) networks in connection with Ancillary Terrestrial Components (ATC). There have been a number of companies attempting to deploy such networks, including ICO Satellite Management (now Pendrell Corporation) and TerreStar (defunct).
The 2.6 GHz range is used for China Multimedia Mobile Broadcasting, a satellite radio and mobile TV standard which, as with proprietary systems in the United States, is incompatible with the open standards used in the rest of the world.
In May 2009, Inmarsat and Solaris Mobile (a joint venture between Eutelsat and SES (EchoStar Mobile)) were each awarded a 2×15 MHz portion of the S band by the European Commission. The two companies are allowed two years to start providing pan-European MSS services for 18 years. Allocated frequencies are 1.98 to 2.01 GHz for Earth to space communications, and from 2.17 to 2.2 GHz for space to Earth communications. The Eutelsat W2A satellite was launched in April 2009 and is located at 10° East.
In Indonesia, S band is used by MNC Vision for Direct-to-Home satellite television (unlike similar services in most countries, which use Ku band). The frequency allocated for this service is 2.52-2.67 GHz (LOF 1.570 GHz).
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S band
The S band is a designation by the Institute of Electrical and Electronics Engineers (IEEE) for a part of the microwave band of the electromagnetic spectrum covering frequencies from 2 to 4 gigahertz (GHz). Thus it crosses the conventional boundary between the UHF and SHF bands at 3.0 GHz. The S band is used by airport surveillance radar for air traffic control, weather radar, surface ship radar, and some communications satellites, particularly satellites used by NASA to communicate with the Space Shuttle and the International Space Station. The 10 cm radar short-band ranges roughly from 1.55 to 5.2 GHz. India's regional satellite navigation network (IRNSS) broadcasts on 2.483778 to 2.500278 GHz.
The S band also contains the 2.4–2.483 GHz ISM band, widely used for low power unlicensed microwave devices such as cordless phones, wireless headphones (Bluetooth), garage door openers, keyless vehicle locks, baby monitors as well as for medical diathermy machines and microwave ovens (typically at 2.495 GHz). One of its largest uses is 2.4 GHz IEEE 802.11 Wi-Fi wireless networks, allowing smartphones, laptops, printers and TVs to connect to the internet without cables.
The largest use of this band is by Wi-Fi networks; the IEEE 802.11b and 802.11g standards use the 2.4 GHz section of the S band. These are the most widely used computer networks in the world, used globally in home and small office networks to link desktop and laptop computers, tablet computers, smartphones, smart TVs, printers, and smart speakers together and to a wireless router to connect them to the Internet, and in wireless access points in public places like coffee shops, hotels, libraries and airports to provide public Internet access for mobile devices.
Mobile services are operated in the 2.3 GHz to 2.6 GHz range, specifically between the 2300–2400 MHz band and the 2500–2690 MHz band. Spectrum in the 3.55–3.7 GHz band has been auctioned off in the United States to be used for CBRS services and spectrum between 3.45–3.55 GHz and 3.7–3.98 GHz has been auctioned off by the FCC for 5G although this spectrum is referred to as C Band by the agency.
In the United States, the FCC approved satellite-based Digital Audio Radio Service (DARS) broadcasting in the S band from 2.31 to 2.36 GHz in 1995, used by Sirius XM Radio. More recently, it has approved portions of the S band between 2.0 and 2.2 GHz for the creation of Mobile Satellite Service (MSS) networks in connection with Ancillary Terrestrial Components (ATC). There have been a number of companies attempting to deploy such networks, including ICO Satellite Management (now Pendrell Corporation) and TerreStar (defunct).
The 2.6 GHz range is used for China Multimedia Mobile Broadcasting, a satellite radio and mobile TV standard which, as with proprietary systems in the United States, is incompatible with the open standards used in the rest of the world.
In May 2009, Inmarsat and Solaris Mobile (a joint venture between Eutelsat and SES (EchoStar Mobile)) were each awarded a 2×15 MHz portion of the S band by the European Commission. The two companies are allowed two years to start providing pan-European MSS services for 18 years. Allocated frequencies are 1.98 to 2.01 GHz for Earth to space communications, and from 2.17 to 2.2 GHz for space to Earth communications. The Eutelsat W2A satellite was launched in April 2009 and is located at 10° East.
In Indonesia, S band is used by MNC Vision for Direct-to-Home satellite television (unlike similar services in most countries, which use Ku band). The frequency allocated for this service is 2.52-2.67 GHz (LOF 1.570 GHz).
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