For example: Agilent E4440A or Anritsu 68369
Signal Gen/Synthesizers/Sweepers
Anritsu MG3695A-2C-3-4
Synthesizer, Ultra Low Phase Noise 10MHz to 50 GHz Signal Generator
Manufacturer: Anritsu
Anritsu MG3696A
MG3696A-1A-2C-3 2GHz-65GHz Ultra Low Phase Noise Signal Generator
Manufacturer: Anritsu
Keysight / Agilent N5183AEP
MXG MW Analog Signal Generator Express Configuration (Distributors in US, CA, CN, TW, KR)
Manufacturer: Keysight / Agilent