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The horizontal axis of the graph labeled, broadside (theta equals 90 degrees) while the vertical axis labeled, z. The z-axis in d B ranges from negative 30 to 0.

The array consists of two elements with a separation d. A main lobe and six side lobes represent the normalized array pattern of excited two-element array. The main lobe beam is in the direction broadside to the array axis. The half beam width of the main lobe labeled, 8.2 degrees. The normalized array factor at theta labeled, F sub start expression a n end expression of theta.