What is the radar system used on carriers and amphibious-type ships that operates in a 2-4 GHz frequency band?

The radar system used on carriers and amphibious-type ships that operates in the 2-4 GHz frequency band is the AN/SPN-43. This radar is designed primarily for air traffic control and landing operations, utilizing its frequency range effectively to provide precision tracking and guidance for aircraft during landing.

The AN/SPN-43 operates in this specific range to enable efficient detection and recognition of both aircraft and other surface targets, which is crucial in a naval environment where safety and operational efficiency are paramount. Its ability to function effectively within this frequency band allows for improved long-range performance and better resolution of targets, making it highly suitable for naval operations.

Other radar systems mentioned may serve different purposes or operate in different frequency bands, which makes them unsuitable for the specific application described in the question.