Which concept allows shaping the beam by applying different delays to array elements, without changing the physical geometry?

Which concept allows shaping the beam by applying different delays to array elements, without changing the physical geometry?

• A. Apodization
• B. Phased-array steering
• C. Mechanical focusing
• D. Pulse compression

Answer: (B)

Shaping the beam by applying different delays across array elements while keeping the physical geometry fixed is the essence of phased-array beamforming. By introducing specific time delays, each element’s emitted wavefronts arrive in phase at a chosen location or direction, producing constructive interference that steers and focuses the beam electronically. This lets you change where you look or where you focus without moving the transducer or altering its shape. Apodization changes the amplitude across the array to reduce sidelobes and doesn’t rely on delaying signals for steering. Mechanical focusing requires changing the physical arrangement or using lenses, which is not about electronic delays. Pulse compression is a signal-processing technique to improve axial resolution, not beam direction or focal-shape control. So the concept described is phased-array steering.

Shaping the beam by applying different delays across array elements while keeping the physical geometry fixed is the essence of phased-array beamforming. By introducing specific time delays, each element’s emitted wavefronts arrive in phase at a chosen location or direction, producing constructive interference that steers and focuses the beam electronically. This lets you change where you look or where you focus without moving the transducer or altering its shape. Apodization changes the amplitude across the array to reduce sidelobes and doesn’t rely on delaying signals for steering. Mechanical focusing requires changing the physical arrangement or using lenses, which is not about electronic delays. Pulse compression is a signal-processing technique to improve axial resolution, not beam direction or focal-shape control. So the concept described is phased-array steering.