Question

Far field region is also known as _________

(a) Near field region

(b) Fraunhofer region

(c) Erlang region

(d) Fresnel region

I have been asked this question in an internship interview.

This intriguing question originated from Free Space Propagation Model in section Mobile Radio Propagation: Large – Scale Path Loss of Wireless/Mobile

Answer 1

Correct option is (b) Fraunhofer region

The explanation: The far field is the region far from the antenna. In this region, the radiation pattern does not change shape with distance. Also, this region is dominated by radiated fields, with the E- and H-fields orthogonal to each other and the direction of propagation as with plane waves.