OML’s Signal Generator Frequency Extension Module can extend the frequency range of your existing 20 GHz microwave synthesizer to millimeter wave frequencies.  Modules are available to span the waveguide bands between 50 and 500 GHz.  These source modules are RoHS compliant.  In addition, an option is available for manual power sweeps using a micrometer as a tuning mechanism.  The standard source module has a prerequisite for +12V that is easily satisfied with many commercially available power supplies.  As an alternative, a specialized option is available (SxxMS-AG) that enables the the Keysight PSG to satisfy the source module's power supply prerequisite.