Antenna Temperature

 Antenna Temperature (Basics, Noise, Gain & Sources)

Basics of Antenna Temperature 

• Antenna Temperature TA is a parameter that describes how much noise an antenna produces in a given Environment. 

• Antenna Temperature is not the physical temperature of the antenna. 

• Antenna Temperature is also sometimes referred to as Antenna Noise Temperature. 

• Antenna Temperature depends on the gain, radiation pattern, and the noise that the antenna picks up from the surrounding environment.

• Antenna Temperature can be described by:

Noise Power by Antenna as per Antenna Temperature 

• Noise Power PTA due to Antenna Temperature TA is given by: 

PTA = KTAB 

• k is Boltzmann's Constant 

• B is Bandwidth of received Signal

Gain with Respect to Temperature 

• Gain with Respect to Temperature (G/T) is a parameter often encountered in specification sheets for antennas that operate in certain environments. 

• It has Unit of (dB/Kelvin).

• At higher gain of Antenna, more noise is getting amplified due to Antenna Temperature.

Sources of Antenna Temperature 

• In General, there are three sources of Antenna Temperature:  

i. Ground Temperature 

ii. Sky Temperature  

iii. Thermal Noise temperature of Feed point