A millimeter-wave frequency extender is a frequency conversion 

module that extends the operating frequency of test equipment—

such as vector network analyzers, signal generators, and spectrum 

analyzers—from the microwave band to the millimeter-wave and 

submillimeter-wave bands, through frequency multiplication, mixing, 

or a combination of both. This modular approach offers a cost-

effective and efficient solution, preserving the core investment in 

existing test equipment.