The 13 centimeter, 2.3 GHz or 2.4 GHz band is a portion of the UHF (microwave) radio spectrum internationally allocated to amateur radio and amateur satellite use on a secondary basis. The amateur radio band is between 2300 MHz and 2450 MHz, and thereby inside the S-band. The amateur satellite band is between 2400 MHz and 2450 MHz, and its use by satellite operations is on a non-interference basis to other radio users (ITU footnote 5.282). The license privileges of amateur radio operators include the use of frequencies and a wide variety of modes within these ranges for telecommunication. The allocations are the same in all three ITU Regions.[1]
The band is also allocated to the Mobile service in the 2300–2400 MHz range on a Primary basis, which in practice creates some difficult sharing scenarios and erratic amateur allocations at the national level.
Above 2400 MHz the band overlaps with the 2.4 GHz ISM (industrial, scientific, and medical) band, and amateur stations must accept harmful interference caused by ISM equipment operating in the band, such as microwave ovens. The ISM band is also used by unlicensed devices, such as Wi-Fi and Bluetooth, which must not cause interference to amateur stations.