Ka-BAND MONOLITHICGaAs BALANCEDMIXERS

A monolithic GaAs balanced mixer chip has been optimized and integrated with a hybrid MIC IF preamplifier in a wafer-type package with significant improvement in RF bandwidth and reduction in chip size. A double sideband noise figure of less than 6 dB has been achieved over and RF signal via two full-height waveguide ports. It consists of two planar mixer diodes and matching circuits for LO and RF waveguides. There are several unique features of the mixer that significantly reduce complexity and take advantage of the monolithic circuit technique. The diodes are electrically in series with respect to the RF a 31 to 39 GHz frequency range with a GaAs chip wavequide. ‘The RF impedance of”a sinqle mixer is size of only .05 X .43 inches. the contribution of a 1.5 dB no to IF preamplifier (5-500 MHz).