1.

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

A. maintaining the distance of /4 between the elements
B. maintaining the distance of /2 between the elements
C. installing an identical array behind the main array at distance /4 and exciting it by current leading in phase by 90
D. installing an identical array behind the main array at distance /2 and exciting it by current leading in phase by 120
Answer» D. installing an identical array behind the main array at distance /2 and exciting it by current leading in phase by 120


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