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Given the array of Fig. 6.1(a) and (b),
find the nulls of the total field when
d=1/4 and then with d=\/2 and: (a) B=0 , (b) B=n/2
by using this equation:
E. = cos e coskd cos e+ B)]
d/2
d/2
to
02
d/2
d/2
(a) Two infinitesimal dipoles
(h) Far-field observations
Fig. 6-1 Geometry of a two-element array positioned along the z-axis.

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