Which array is particularly useful in radar applications?

In radar applications, a two-dimensional planar array is particularly useful due to its ability to provide a wide coverage area and facilitate high-resolution imaging. This type of array allows for the simultaneous transmission and reception of radar signals over a broader spatial domain, thereby enhancing target detection and tracking capabilities.

The planar nature of the array enables it to perform electronic steering of the radar beam, meaning it can rapidly change the direction of its focus without physically moving the radar system. This capability is essential in applications requiring quick responses to dynamic environments, such as tracking fast-moving objects in air or on the ground.

While other options like multiple elevation, twelve feedhorn, and dual feedhorn configurations have their own specific applications and advantages, they do not offer the level of flexibility and coverage provided by a two-dimensional planar array in radar scenarios. Hence, the planar configuration is favored for its efficiency in handling the range of challenges encountered in radar technology.