Subminiature-P (SMP) connectors are rated to 40 GHz and, depending on detent type, can withstand from 100 to 100,000 interconnect cycles. Other connectors for RF frequency multipliers include MMCX, ...

Pasternack, a provider of RF, microwave and millimetre-wave products ... offering a broad selection of cable types for a wide range of uses. They support numerous connectors, including BNC, MCX, MMCX, ...