The noise temperature of an antenna is given by the expression:
A)radtb + (1-rad) tp
B)(1-rad) tp
C)radtb
D)none of the mentioned

Question

Quizplus · Accepted Answer

The noise temperature of an antenna is given by the expression $T = \text{rad} \cdot T_b + (1-\text{rad}) \cdot T_p$, where $T$ is the total noise temperature, $\text{rad}$ is the radiation efficiency, $T_b$ is the brightness temperature of the antenna's surroundings, and $T_p$ is the physical temperature of the antenna. This formula accounts for both the noise picked up from the antenna's surroundings and the internal noise generated by the antenna itself.

The Noise Temperature of an Antenna Is Given by the Expression