1.

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»

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.



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