Which array is particularly useful in radar applications?

Which array is particularly useful in radar applications?

• A. Linear array
• B. Two-dimensional planar
• C. Ring array
• D. Three-dimensional cube array

Answer: (B)

The essential idea is that you want to steer a radar beam quickly and accurately in two dimensions. A planar array, with elements laid out in a single plane, lets you control the phase across the array so the main beam can be steered electronically in both azimuth and elevation. That means you can scan a volume of airspace or weather targets without moving the antenna mechanically, providing fast, flexible 3D coverage and high angular resolution. Other configurations don’t offer the same combination. A linear array can steer across one plane only, needing mechanical tilt for elevation to cover the other dimension. A ring array supports circular (azimuth) scanning but gets limited or more complex handling for elevation changes. A cube or 3D array is technically possible but impractical for most systems due to size, complexity, and calibration challenges.

The essential idea is that you want to steer a radar beam quickly and accurately in two dimensions. A planar array, with elements laid out in a single plane, lets you control the phase across the array so the main beam can be steered electronically in both azimuth and elevation. That means you can scan a volume of airspace or weather targets without moving the antenna mechanically, providing fast, flexible 3D coverage and high angular resolution.

Other configurations don’t offer the same combination. A linear array can steer across one plane only, needing mechanical tilt for elevation to cover the other dimension. A ring array supports circular (azimuth) scanning but gets limited or more complex handling for elevation changes. A cube or 3D array is technically possible but impractical for most systems due to size, complexity, and calibration challenges.