STE-144224KF1205-05-S1 is a G-Band X12 frequency extender that uses an input frequency range of 11.6 to 18.3 GHz at +3 dBm along with harmonic generation and filtering to produce a 140 to 220 GHz RF signal. The extender is designed and manufactured as a bench top unit to extend the low frequency synthesizer or sweeper, such as Eravant models STL-SG-022203-S1 or SOT-02220313200-SF-B6, without losing all of the functionalities and features. The extender also features adjustable legs, which can also be removed, to allow for an easy test set up.