The noise temperature of an antenna is given by the expression:

Related MCQs

• A rectangular horn antenna has an aperture area of 3λ × 2λ. If the aperture efficiency of an antenna is 90%, then the directivity of the antenna is:
• The electrical size of antenna is increased by antenna array to avoid size lobes compared to single antenna.
• The equivalent noise temperature of a network given the noise figure of the network or system is:
• The terminal impedance of a dipole antenna is 710 Ω. The terminal impedance of the slot antenna given the intrinsic impedance of air is 377 Ω is:
• Expression for noise of a two port network considering the noise due to transmission line and other lossy components is:
• The basic equation of radiation that is applied to any antenna irrespective of the type of the antenna is:
• An antenna has a field pattern E (θ) =cos θ. cos 2θ. The first null beam width of the antenna is:
•                    of an antenna is a plot of the magnitude of the far field strength versus position around the antenna.
• If the beam width of an antenna in two orthogonal planes are 300 and 600. Then the directivity of the antenna is:
• If the power input to an antenna is 100 mW and if the radiated power is measured to be 90 mW, then the efficiency of the antenna is: