Question

A uniform linear array contains _____________

(a) N elements placed at equidistance and fed currents of equal magnitude and progressive phase shift

(b) N elements at non-equidistance and fed currents of equal magnitude and progressive phase shift

(c) N elements at equidistance and fed currents of unequal magnitude and progressive phase shift

(d) N elements at equidistance and fed currents of unequal magnitude and equal phase shift

The question was asked in an international level competition.

This key question is from Introduction topic in division Antenna Array of Antennas

Answer 1

Right option is (a) N elements placed at equidistance and fed currents of equal magnitude and progressive phase shift

The explanation: An array is said to be linear if N elements are spaced equally long the line and is a uniform array if the current is fed with equal magnitude to all elements and progressive phase shift along the line. High directivity can be obtained by antenna array.