Design and characterization of 77 GHz and 120 GHz Schottky diode mixers for antenna measurements

Some passive millimeter-wave harmonic mixers with integrated LO-IF diplexers have been designed and characterized for both 77 GHz and 120 GHz frequency bands. These modules have been employed to work as an extension for the higher millimeter-wave antenna measurements, particularly the radiation pattern. Through this article, several characterized parameters have been presented, such as the conversion loss, the IF and LO return loss and the LO-IF isolation, besides the design and simulation procedures of the integrated diplexer and the RF and LO impedance matching networks of the mixer. The realized modules have been used to record the radiation pattern of two antennas operating at the same band.