Question

If the progressive shift in antenna array is equal to zero then it is called _________

(a) Broad side

(b) End-fire

(c) Yagi-uda

(d) Fishbone antenna

Answer 1

The correct choice is (a) Broad side

Easy explanation: The total phase difference of the fields is given by Ѱ=kdcosθ+β

Here β is the progressive phase shift

⇨ β=0, array is a uniform broadside array

⇨ β=180, array is a uniform end-fire array

Yagi-uda antenna, fishbone antenna are end-fire antenna array.