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In [[telecommunication]], '''antenna noise temperature''' is the temperature of a hypothetical resistor at the input of an ideal [[signal noise|noise]]-free receiver that would generate the same [[output]] [[noise power]] per unit [[Bandwidth (signal processing)|bandwidth]] as that at the [[antenna (radio)|antenna]] output at a specified [[frequency]].   


Antenna noise temperature has contributions from several sources:
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*[[Galactic radiation]]
*Earth heating
*[[The sun]]
*Electrical devices
*The antenna itself
 
Galactic noise is high below 1000&nbsp;MHz. At around 150&nbsp;MHz, it is approximately 1000K. At 2500&nbsp;MHz, it has leveled off to around 10K.
 
Earth has an accepted standard temperature of 290K.
 
The level of the sun's contribution depends on the solar flux.  It is given by
 
:<math>T_A=3.468F{{\lambda}^2}10^{G/10}</math>
 
:where <math>F</math> is the solar flux,
 
:<math>\lambda</math> is the wavelength,
 
:and <math>G</math> is the gain of the antenna in decibels.
 
The antenna [[noise temperature]] depends on antenna [[coupling (electronics)|coupling]] to all noise sources in its environment as well as on noise generated within the antenna. That is, in a directional antenna, the portion of the noise source that the antenna's main and side lobes intersect contribute proportionally.
 
For example, a satellite antenna may not receive noise contribution from the earth in its main lobe, but sidelobes will contribute a portion of the 290K earth noise to its overall noise temperature.
 
==See also==
*[[Noise Temperature]]
*[[Federal Standard 1037C]]
*[[MIL-STD-188]]
 
==References==
{{reflist}}
{{cite book | title = The Arrl Uhf/Microwave Experimenter's Manual | publisher = American Radio Relay League | location = Newington | year = 1990 | isbn = 0-87259-312-6 }}
 
==External links==
 
[[Category:Temperature]]
[[Category:Noise]]

Latest revision as of 05:59, 6 December 2014

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