Mixers - VDI offers fundamental mixers (FM), subharmonically-pumped mixers (SHM) and N^th harmonic mixers (HM). These mixers use only planar and/or integrated diodes and provide state-of-the-art performance.  The fundamental mixers require an external diplexer to combine the RF and LO signals. The subharmonically-pumped mixers and N^th harmonic mixers have a separate LO waveguide flange and typically exhibit > 100 dB isolation of the LO at the RF port. Click on the model number in the table below for more information.