A nonuniform linear array has 3 elements placed symmetrically along the 2-ais and spaced d= A/4 apart, and all are fed with the same phase. However, t total amplitude excitation coefficients of the elements are as follows: 2 for the center element . Unity for each of the edge elements For the array factor of the array, determine the: (a) Angle (in degrees) where the maximum of the main lobe occurs. (b) Angles 9 (in degrees) where the 2 half-power points of the main lobe occur (c) Half-power beamwidth (in degrees) of the main lobe. (d) Approximate maximum directivity (dimensionless and in dB).