One method of decreasing grating lobes during manufacturing is called _____.

One method of decreasing grating lobes during manufacturing is called _____.

• A. Subdicing
• B. Dicing
• C. Micro-lens
• D. Phasing

Answer: (A)

Grating lobes come from the array’s spacing being too large relative to the wavelength, so unwanted secondary beams appear as you steer or broaden the beam. Subdicing addresses this directly in manufacturing by dividing each larger element into many smaller subelements. This reduces the effective spacing between radiating parts, making the array behave more like a densely packed one and suppressing grating lobes across the scan range. It’s a specific fabrication technique aimed at lowering these lobes, rather than an electronic beamforming method. Other options are less focused on the manufacturing change needed to reduce grating lobes: phasing involves how you drive the elements electronically, micro-lens isn’t about array spacing, and while dicing cuts elements, subdicing is the targeted approach used to achieve the suppression.

Grating lobes come from the array’s spacing being too large relative to the wavelength, so unwanted secondary beams appear as you steer or broaden the beam. Subdicing addresses this directly in manufacturing by dividing each larger element into many smaller subelements. This reduces the effective spacing between radiating parts, making the array behave more like a densely packed one and suppressing grating lobes across the scan range. It’s a specific fabrication technique aimed at lowering these lobes, rather than an electronic beamforming method. Other options are less focused on the manufacturing change needed to reduce grating lobes: phasing involves how you drive the elements electronically, micro-lens isn’t about array spacing, and while dicing cuts elements, subdicing is the targeted approach used to achieve the suppression.