Question

Which of the following statement is false?

(a) Noise power of antenna depends on the antenna temperature as well as the noise due to the receiver surroundings

(b) Noise figure value lies between 0 and 1

(c) Any object with physical temperature greater than 0K radiates energy

(d) Noise power per unit bandwidth is kTA  W/Hz

I got this question by my college director while I was bunking the class.

Question is taken from Antenna Noise Temperature in portion Antenna Parameters – II of Antennas

Answer 1

The correct option is (b) Noise figure value lies between 0 and 1

The best I can explain: The relation between noise figure and effective noise temperature is given by F=1+\(\frac{T_e}{T_o}\)

And object with physical temperature greater than 0K radiates energy. So \(\frac{T_e}{T_o}\) > 0 and F > 1

Noise power per unit bandwidth of antenna is kTA  W/Hz while noise power of antenna is kTAB W