Which statement correctly contrasts annular phased arrays and linear sequential arrays?

Which statement correctly contrasts annular phased arrays and linear sequential arrays?

• A. Annular phased arrays use rectangular strips; Linear sequential uses concentric rings
• B. They both use concentric rings
• C. Linear sequential uses concentric rings; Annular uses rectangular strips
• D. Annular phased arrays use concentric rings; Linear sequential uses rectangular strips side by side

Answer: (D)

The key idea is how the elements are arranged and how that geometry shapes the beam. Annular phased arrays use concentric circular rings around a central point, which lets the beam be focused and steered by applying appropriate phase delays across the rings. Linear sequential arrays place rectangular elements side by side in a straight line, producing a fan-shaped beam and scanned by firing elements along that line. So the correct statement is that annular phased arrays use concentric rings, while linear sequential arrays use rectangular strips side by side.

The key idea is how the elements are arranged and how that geometry shapes the beam. Annular phased arrays use concentric circular rings around a central point, which lets the beam be focused and steered by applying appropriate phase delays across the rings. Linear sequential arrays place rectangular elements side by side in a straight line, producing a fan-shaped beam and scanned by firing elements along that line. So the correct statement is that annular phased arrays use concentric rings, while linear sequential arrays use rectangular strips side by side.