Low noise beam-lead diode mixer for the 3 mm radio astronomical receiver at the metsähovi radio research station

A 3 mm low noise beam-lead Schottky diode mixer has been developed. At cryogenic temperatures the conversion loss is ~ 6.3 dB, and the DSB mixer noise temperature is ~75 K, respectively. The mixer was installed into the cooled receiver for radioastronomical observations at the Metsähovi 13.7-m radio telescope. Total DSB noise temperature of the cooled receiver with an ultra low noise HEMT IF amplifier was ~ 110 K at 103 GHz. The tuning range of the mixer mount was from ~ 70 GHz to ~ 115 GHz.