Question: An array of N = 4 dipole antennas placed on the y-axis vertically must be fed to radiate with equal intensity in the and -

An array of N = 4 dipole antennas placed on the y-axis vertically must be fed to radiate with equal intensity in the and - directions. What should be the distance between the dipoles and the power phase . if the array factor should have only one main lobe on each side?

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