Question

Which of the following statements is false regarding a broadside array?

(a) The maximum radiation is normal to the axis of the array

(b) Must have same amplitude excitation but different phase excitation among different elements

(c) The spacing between elements must not equal to the integral multiples of λ

(d) The phase excitation difference must be equal to zero

This question was posed to me in unit test.

The above asked question is from Broadside Array topic in portion Antenna Array of Antennas

Answer 1

Right option is (b) Must have same amplitude excitation but different phase excitation among different elements

The explanation: Since the phase excitation difference is zero it means that all are equally excited with same phase. In a Broadside array the maximum radiated is directed towards the normal to the axis of the array. The spacing between elements is not equal to integral multiples of λ to avoid grating lobes.