S band

[1] 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.

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).

IndoStar-1 was the world's first commercial communications satellite to use S-band frequencies for broadcast, which efficiently penetrate the atmosphere and provide high-quality transmissions to small-diameter 80 cm antennas in regions that experience heavy rainfall such as Indonesia.

A similar Ku- or C-band reception performance requires greater transmission power or much larger dish to penetrate the moist atmosphere.

For example, the James Webb Space Telescope, launched in 2021, utilizes 2 GHz S-band to enable 40 kbps real time telemetry[5] from near the Sun–Earth L2 point.

The biggest user of CBRS (Citizens Broadband Radio Service) spectrum is the United States Navy.

[7][8] Cable companies are planning to use the band for wireless broadband in rural areas, with Charter Communications beginning tests of the service in January 2018.