Question

Expression for noise figure F related to the effective noise temperature Te is ____

(a) \(F=1+\frac{T_e}{T_o}\)

(b) \(F=1+\frac{T_0}{T_e}\)

(c) \(F=1-\frac{T_e}{T_o}\)

(d) \(F=1-\frac{T_0}{T_e}\)

The question was posed to me in a national level competition.

The question is from Antenna Noise Temperature topic in chapter Antenna Parameters – II of Antennas

Answer 1

The correct answer is (a) \(F=1+\frac{T_e}{T_o}\)

Best explanation: The noise introduced by antenna is known as the effective noise temperature. The relation between noise figure and effective noise temperature is given by

 \(F=1+\frac{T_e}{T_o}, T_o\) is the room temperature.