  Microcombs are powerful tools as sources of multiple wavelength channels for
photonic RF signal processing. They offer a compact device footprint, large
numbers of wavelengths, and wide Nyquist bands. Here, we review recent progress
on microcomb-based photonic RF signal processors, including true time delays,
reconfigurable filters, Hilbert transformers, differentiators, and
channelizers. The strong potential of optical micro-combs for RF photonics
applications in terms of functions and integrability is also discussed.
