1-THz low-noise SIS mixer with a double-dipole antenna |
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| Authors: | S. V. Shitov A. V. Markov B. D. Jackson A. M. Baryshev N. N. Iosad J. -R. Gao T. M. Klapwijk |
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| Affiliation: | (1) Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Mokhovaya ul. 11, Moscow, 101999, Russia;(2) National Institute for Space Research of the Netherlands (SRON), Groningen, the Netherlands;(3) Delft University of Technology (DIMES), Delft, the Netherlands |
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| Abstract: | A quasi-optical mixer containing two Nb/Al/AlOx/Nb superconducting tunnel junctions integrated into a NbTiN/SiO2/Al microstrip line is studied experimentally in the 800–1000 GHz frequency range. The mixer is developed as an optional front end of the heterodyne receiver operating in frequency band 3 or 4 and incorporated into the HIFI module of the Herschel space-borne telescope. The double-dipole antenna of the mixer is made of NbTiN and Al films; the quarter-wavelength reflector, of a Nb film. The mixer is optimized for the IF band of 4–8 GHz. The double-sideband noise temperature T RX measured at 935 GHz is 250 K at a mixer temperature of 2 K and an IF of 1.5 GHz. Within 850–1000 GHz, T RX remains below 350 K. The antenna pattern is symmetrical with a sidelobe level below −16 dB. |
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