I know I guy who worked on dual band radar. It's basically two radars, an x-band and s-band radar, that are supposed to work together. X-band ( 10,000 MHz) is better at some things, S-Band (3,000 MHz) at others. There were two contractors, one working on S-Band, the other on X-Band and integration. He worked on X-Band. He thought the S-Band delivered by the other contractor was a brick. In any case, the Navy has said it will discontinue Dual Band Radar (not necessarily abandon the concept of two radars, the product DBR) after the CVN-78. It's a one-off.
Carriers do not need fire control with no missiles, so what was the driver for the higher range resolution?