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Q4: Design a four-element ordinary end-fire array with the elements placed along the z-axis for a spacing
of d-4 between the elements and has a radiation pattern toward 0 = 180, find the:
C
(a) progressive phase excitation between the elements.
(b) angles where the nulls of the array factor occur.
(c) angles where the max of the array factor occurs.
(d) FNBW and HPBW of the array factor.
(e) directivity (in dB) of the array factor.

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