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Electromagnetic Field Theory - Engineering

Q1:

The bidirectional pattern of a broadside array can be converted into unidirectional by

A maintaining the distance of λ/4 between the elements

B maintaining the distance of λ/2 between the elements

C installing an identical array behind the main array at distance λ/4 and exciting it by current leading in phase by 90°

D installing an identical array behind the main array at distance λ/2 and exciting it by current leading in phase by 120°

ANS:C - installing an identical array behind the main array at distance λ/4 and exciting it by current leading in phase by 90°

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