Matrix 4-element sis receiver of the 3mm wavelength range for the RT-22 telescope

With the collaboration of Group for Advanced Receiver Development (GARD), a project of building 3 mm SIS multi-beam (matrix) receiver for the 22-m radio telescope of the Crimean Astrophysical observatory was launched. The receiver employs compact DSB SIS mixers, designed by GARD for matrix receiver applications. It shows good stability and provides receiver DSB noise temperature better than 50K in the frequency range 85-110 GHz. Broadband impedance transformation of the SIS junction allows covering working frequency band with a fixed backshort position.