W band

W band

The W band of the microwave part of the electromagnetic spectrum ranges from 75 to 111 GHz. It sits above the U.S. IEEE designated V band (50–75 GHz) in frequency, yet overlaps the NATO designated M band (60–100 GHz). The W band is used for millimeter wave radar research, military radar targeting and tracking applications, and some non-military applications.

A number of passive millimetre-wave cameras for concealed weapons detection operate at 94 GHz. A frequency around 77 GHz is used for automotive cruise control radar. The atmospheric radio window at 94 GHz is used for imaging millimetre-wave radar applications in astronomy, defense, and security applications.

Less-than-lethal weaponry exists that uses millimeter waves to heat a thin layer of human skin to an intolerable temperature so as to make the targeted person move away. A two-second burst of the 95 GHz focused beam heats the skin to a temperature of 130 °F (54 °C) at a depth of 1/64th of an inch (0.4 mm). The United States Air Force and Marines are currently using this type of Active Denial System. [ [http://www.raytheon.com/products/stellent/groups/public/documents/content/cms04_017939.pdf Raytheon's Silent Guardian millimeter wave weapon] ]

The 71 - 76 GHz / 81 - 86 GHz segment of the W-band is allocated by the International Telecommunication Union to satellite services. Because of increasing spectrum and orbit congestion at lower frequencies, W-band satellite allocations are of increasing interest to commercial satellite operators, although no commercial project has yet been implemented in these bands.

References


* 5th Framework Programme Information Societies Technologies (IST) - Multifunctional Automotive Radar Network (RadarNet) [http://www.radarnet.org/publications/zip/its_paper.pdf]
* The design of a real-time 94 GHz passive millimetre-wave imager for helicopter operations, R. Appleby, R. Anderton, N. Thomson, J. Jack, Proc. SPIE, 5619, pp. 38 (2004). doi|10.1117/12.581336

External links

* [http://www.ecdl.tkk.fi/research/projects/94cpr.php?lang=en A cloud radar at 94 GHz]

ee also


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