[′sē ‚band ¦fikst ¦sad·ə‚līt ‚sər·vəs] (communications) Satellite communication at frequencies in and near the C band, with the uplink frequency in a band from 5.85 to 7.075 gigahertz and the downlink frequency in bands from 3.4 to 4.2 gigahertz and 4.5 to 4.8 gigahertz.