Noise figure, antenna temperature and sensitivity level for wireless communication receivers. (part 1)

Microwave Journal | March 1, 1998| | Copyright

Noise figure is used as a figure of merit to describe the amount of noise added to an RF signal passing through a component with an input and output port. All components add noise to the signal, leading to a decreased signal-to-noise ratio (SNR) at their output ports. By definition, noise figure is the ratio of the SNR at the input of the two-port device to the SNR observed at the output port when the input noise level corresponds to that generated by a resistor at 290 degrees Kelvin (K).[1] (A passive resistor at a temperature T generates white Gaussian noise at a level of kT ...

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