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C band is a name given to certain portions of the electromagnetic spectrum, as well as a range of wavelengths of light, used for communications. The IEEE C band and its variations, in particular, are microwave ranges used for certain satellite television broadcasts, and by some Wi-Fi devices, cordless phones, and weather radars. For satellite communications, the lower frequencies used by C Band perform better under adverse weather conditions than the Ku band or Ka band frequencies.[1]
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NATO C band
The NATO C band is that portion of the electromagnetic spectrum between 500 MHz and 1000 MHz.
IEEE C band
The IEEE C band is a portion of the electromagnetic spectrum in the microwave range of frequencies ranging from 4 to 8 GHz.[2].
It was the first frequency band allocated for commercial ground-to-satellite communications. A typical C band satellite uses 3.7–4.2 GHz for downlink, and 5.925–6.425 GHz for uplink. C band is primarily used for open satellite communications, whether for full-time satellite TV networks or raw satellite feeds, although subscription programming also exists. This use contrasts with direct broadcast satellite, which is a completely closed system used to deliver subscription programming to small satellite dishes connected to proprietary receiving equipment.
C band is highly associated with TVRO satellite reception systems, commonly called "big dish" systems since small receiving antennas are not optimal for C-band systems. Typical antenna sizes on C-band capable systems ranges from 7.5 to 12 feet (2.5 to 3.5 meters) on consumer satellite dishes, although larger ones also can be used.
The 5.4GHz band (5.15–5.35/5.47–5.725/5.725–5.875 GHz) is used for IEEE 802.11a Wi-Fi and cordless phone applications, leading to occasional interference with C band weather radars.
C band variants
Slight variations of C band frequencies are approved for use in various parts of the world.
| C Band Variants Around The World | ||
| Band | Transmit Frequency (GHz) |
Receive Frequency (GHz) |
| Extended C Band | 5.850–6.425 | 3.625–4.200 |
| Super Extended C Band | 5.850–6.725 | 3.400–4.200 |
| INSAT C Band | 6.725–7.025 | 4.500–4.800 |
| Palapa C Band | 6.425–6.725 | 6.425–6.725 |
| Russian C Band | 5.975–6.475 | 3.650–4.150 |
| LMI C Band | 5.7250–6.025 | 3.700–4.000 |
Optical communications C band
C band is also used in optical communications to refer to the wavelength range 1530 nm to 1565 nm.
See also
Notes
- ^ What is C Band page from tech-faq (accessed Aug. 14, 2008)
- ^ Peebles, Peyton Z. Jr, (1998), Radar Principles, John Wiley and Sons, Inc., p 20.
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