Question: Four elements are located on the z-axis. The main beam points to the direction = 0 (end-fire radiator). The inter-element spacing is d = /2

Four elements are located on the z-axis. The main beam points to the direction = 0 (end-fire radiator). The inter-element spacing is d = /2 and = kd cos + , where is the progressive phase shifting. What is the value of ? = 0 rad = -/4 rad = -/2 rad = - rad

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