Low Conversion Loss Millimeter Wave Mixers

To be reported in this paper are new results obtained for mixers in the frequency range up to 95 GHz. Both frequency diplexer types of mixers and those which utilize a standard directional coupler for LO injection will be discussed. The mixers use a replaceable wafer type diode holder. The replaceable wafer contains a unique Westinghouse developed double diode structure which results in very low RF losses. The diode is a GaAs Schottky barrier with zero bias frequency cut-off of over 800 GHz. Theoretically predicted values of conversion loss under 5.0 dB are attained over the frequency range.