In a linear phased array, how many active elements are used to form each beam?

In a linear phased array, how many active elements are used to form each beam?

• A. One element
• B. Two elements
• C. All of the active elements
• D. Several elements depending on beam width

Answer: (C)

In a linear phased array, beam formation comes from combining emissions from the entire active aperture with precise time delays. By exciting every active element with the appropriate delays, the waves interfere constructively in the chosen direction, creating a narrow, steerable beam. If you used only one element, two elements, or a subset, the resulting pattern would be broader and harder to steer, reducing lateral resolution. The beam width and steerability come from the full active set working together, so the best answer is that all of the active elements form each beam.

In a linear phased array, beam formation comes from combining emissions from the entire active aperture with precise time delays. By exciting every active element with the appropriate delays, the waves interfere constructively in the chosen direction, creating a narrow, steerable beam. If you used only one element, two elements, or a subset, the resulting pattern would be broader and harder to steer, reducing lateral resolution. The beam width and steerability come from the full active set working together, so the best answer is that all of the active elements form each beam.