X band

The X-band is a segment of the microwave radio region of the electromagnetic spectrum. In some cases, such as in communication engineering, the frequency range of X-band is rather indefinitely set at approximately 7.0 to 11.2 gigahertz (GHz). In radar engineering, the frequency range is specified by the IEEE at 8.0 to 12.0 GHz.

The term "X-band" is also used informally and inaccurately to refer to the extended AM broadcast band, where the "X" stands for "extended".

Satellite communications

For military communications satellites, the ITU has assigned the X-band uplink frequency band (for sending modulated signals) as from 7.9 to 8.4 GHz. The ITU-assigned downlink frequency band (for receiving signals) is from 7.25 to 7.75 GHz. The typical local oscillator frequency of an X-band low-noise block converter (LNB) is 6300 MHz. Both of these frequency bands are 500 megahertz wide.

In engineering, this pair of frequency bands may be referred to as the 8 / 7 GHz X-band satellite communications system.

Radar

X-band is used in radar applications including continuous-wave, pulsed, single-polarization, dual-polarization, synthetic aperture radar, and phased arrays. X-band radar frequency sub-bands are used in civil, military, and government institutions for weather monitoring, air traffic control, maritime vessel traffic control, defense tracking, and vehicle speed detection for law enforcement.^[1]

X-band is often used in modern radars. The shorter wavelengths of the X-band allow for higher resolution imagery from high-resolution imaging radars for target identification and discrimination.

Terrestrial communications and networking

In Ireland, Libya, Saudi Arabia and Canada, the X-band 10.15 to 10.7 segment is used for terrestrial broadband. Alvarion, Cambridge, and Ogier make systems for this, though these are all incompatible. The Ogier system is a full duplex Transverter used for DOCSIS over microwave. The home / Business CPE has a single coaxial cable with a power adapter connecting to an ordinary cable modem. The local oscillator is usually 9750 MHz, the same as for K_u-band satellite TV LNB. Two way applications such as broadband typically use a 350 MHz TX offset.

Space Communications

Portions of the X-band are assigned by the International Telecommunications Union (ITU) exclusively for deep space telecommunications. The primary user of this allocation is the American NASA Deep Space Network (DSN). DSN facilities are located in Goldstone, California (in the Mojave Desert), near Canberra, Australia, and near Madrid, Spain.

These three stations, located approximately 120 degrees apart in longitude, provide continual communications from the Earth to almost any point in the Solar System independent of Earth rotation. DSN stations are capable of using the older and lower S-band deep-space radio communications allocations, and some higher frequencies on a more-or-less experimental basis, such as in the K-band.

Notable deep space probe programs that have employed X-band communications include the Viking Mars landers; the Voyager missions to Jupiter, Saturn, and beyond; the Galileo Jupiter orbiter; and the Cassini-Huygens Saturn orbiter.

An important use of the X-band communications came with the two Viking program landers. When the planet Mars was passing near or behind the Sun, as seen from the Earth, a Viking lander would transmit two simultaneous continuous-wave carriers, one in the S-band and one in the X-band in the direction of the Earth, where they were picked up by DSN ground stations. By making simultaneous measurements at the two different frequencies, the resulting data enabled theoretical physicists to verify the mathematical predictions of Albert Einstein's General Theory of Relativity. These results are some of the best confirmations of the General Theory of Relativity.

Amateur radio

The Radio Regulations of the International Telecommunication Union allow amateur radio operations in the frequency range from 10.000 to 10.500 GHz.^[2]

Motion detection

Motion detectors often use 10.525 GHz.^[3] 10.4 GHz is proposed for traffic light crossing detectors.

See also

• Cassegrain reflector
• Directional antenna
• XTAR
• Sea-based X-band Radar
• New Horizons#Telecommunications
• Voyager program#Spacecraft design

References

This article needs additional citations for verification. Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (February 2008)

1. ^ Radar Bands
2. ^ VHF Handbook of IARU Region 1 (2006), pg. 50
3. ^ 10GHz Wideband Transceiver

External links

• http://www.ntia.doc.gov/osmhome/allochrt.pdf
• http://www.g3pho.free-online.co.uk/microwaves/wideband.htm

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