Question

The ratio of power radiated in a particular direction to the total input power of antenna is called as _____

(a) Directive gain

(b) Power gain

(c) Directivity

(d) Partial directivity

This question was addressed to me in an interview.

Enquiry is from Power Gain in section Antenna Parameters of Antennas

Answer 1

Correct choice is (b) Power gain

To explain I would say: The ratio of power radiated in a particular direction to the actual power input to antenna is called Power gain. \(G_p=\frac{P_{d(\theta,\emptyset)}}{P_{in}}\). Directive gain is the ratio of power radiated in desired direction to the average power radiated from the antenna. Partial directivity is the part of radiation intensity in a particular polarization to radiation intensity in all directions.