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electronics and communication engineering electromagnetic field theory
1. The bidirectional pattern of a broadside array can be converted into unidirectional by
(A): installing an identical array behind the main array at distance λ/2 and exciting it by current leading in phase by 120°
(B): installing an identical array behind the main array at distance λ/4 and exciting it by current leading in phase by 90°
(C): maintaining the distance of λ/2 between the elements
(D): maintaining the distance of λ/4 between the elements
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