Super high frequency (or
SHF) refers to
radio frequenciesRadio frequency is a frequency, or rate of oscillation, of electromagnetic radiation within the range of about 3 Hz to 300 GHz. This range corresponds to the frequency of alternating current electrical signals used to produce and detect radio waves...
(RF) in the range of 3
GHzThe hertz is a unit of frequency. It is defined as the number of complete cycles per second. It is the basic unit of frequency in the International System of Units , and is used worldwide in both general-purpose and scientific contexts...
and 30 GHz. Also known as the
centimeter band or
centimeter wave as the wavelengths range from ten to one centimeters.
The
International Telecommunication UnionThe International Telecommunication Union is the second-oldest international organization still in existence , established to standardize and regulate international radio and telecommunications. It was founded as the International Telegraph Union in Paris on 17 May 1865...
(ITU), an international civil organization established to standardized worldwide
telecommunicationTelecommunication is transmission over a distance for the purpose of communication. In earlier times, this may have involved the use of smoke signals, drums, semaphore, flags or heliograph. In modern times, telecommunication typically involves the use of electronic devices such as the telephone,...
s, have stated that the superhigh frequency is encountered between 100 mm to 10 mm.
Discussion
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Super high frequency (or
SHF) refers to
radio frequenciesRadio frequency is a frequency, or rate of oscillation, of electromagnetic radiation within the range of about 3 Hz to 300 GHz. This range corresponds to the frequency of alternating current electrical signals used to produce and detect radio waves...
(RF) in the range of 3
GHzThe hertz is a unit of frequency. It is defined as the number of complete cycles per second. It is the basic unit of frequency in the International System of Units , and is used worldwide in both general-purpose and scientific contexts...
and 30 GHz. Also known as the
centimeter band or
centimeter wave as the wavelengths range from ten to one centimeters.
Description
The
International Telecommunication UnionThe International Telecommunication Union is the second-oldest international organization still in existence , established to standardize and regulate international radio and telecommunications. It was founded as the International Telegraph Union in Paris on 17 May 1865...
(ITU), an international civil organization established to standardized worldwide
telecommunicationTelecommunication is transmission over a distance for the purpose of communication. In earlier times, this may have involved the use of smoke signals, drums, semaphore, flags or heliograph. In modern times, telecommunication typically involves the use of electronic devices such as the telephone,...
s, have stated that the superhigh frequency is encountered between 100 mm to 10 mm. Super high frequency electromagnetic waves are relatively short for
radio wavesRadio waves are that part of the electromagnetic spectrum with wavelengths longer than infrared light. Naturally-occuring radio waves are produced by lightning, or by astronomical objects. Artificially-generated radio waves are used for broadcasting, mobile and fixed communications, navigation,...
. This frequency is used for microwave devices,
WLANA wireless local area network links two or more devices using some wireless distribution method , and usually providing a connection through an access point to the wider internet...
, most modern
radarRadar is an object detection system that uses electromagnetic waves to identify the range, altitude, direction, or speed of both moving and fixed objects such as aircraft, ships, motor vehicles, weather formations, and terrain. The term RADAR was coined in 1941 as an acronym for RAdio Detection And...
s. The commencing
Wireless USBWireless USB is a short-range, high-bandwidth wireless radio communication protocol created by the Wireless USB Promoter Group. Wireless USB is sometimes abbreviated as "WUSB", although the USB Implementers Forum discourages this practice and instead prefers to call the technology "Certified...
technology will be using approximately 1/3 of this spectrum.
Uses
Some uses are IEEE 802.11a wireless LANs, satellite uplinks/downlinks and terrestrial high-speed data links which are sometimes referred to as "backhauls".
External links