Nonuniform driving of elements in an array to reduce grating lobes is known as

• A. Aperture
• B. Apodization
• C. Array
• D. Axial Resolution

Answer: (B)

Apodization is applying a weighting to each array element’s drive to shape the radiation pattern and suppress grating lobes. By driving the elements nonuniformly, energy is tapered toward the edges of the aperture, which reduces the strong sidelobes that arise from a uniformly excited, periodic array. This tapering diminishes the grating lobes in the far field, improving image quality by fewer artifacts from these unwanted directions. The other terms describe different ideas: aperture is the physical size of the emitting surface, an array is the group of elements used, and axial resolution concerns the ability to distinguish structures along the beam direction, influenced by pulse duration and bandwidth rather than how the elements are excited.