Design and Performance of a Sideband Separating SIS Mixer for 800-950 GHz

Andrey Khudchenko*, Ronald Hesper, Andrey M. Baryshev, Jan Barkhof, Kirill Rudakov, Daniel Montofre, Duc Van Nguyen, Valery P. Koshelets, Pavel N. Dmitriev, Mikhail Fominsky, Christopher Heiter, Stefan Heyminck, Rolf Guesten, Bernd Klein

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)


We present the design and results of characterization of a new sideband separating (2SB) mixer for 800-950GHz, based on superconductor-insulator-superconductor (SIS) junctions. This is the first waveguide 2SB SIS mixer demonstrated at such a high frequency. The design is following the classical quadrature hybrid architecture, meanwhile additional attention was put on the reduction of reflections in the RF structure in order to minimize the RF imbalance, to achieve a high image rejection ratio (IRR). The RF waveguide block was manufactured by micromilling and populated by single-ended SIS mixers developed earlier for upgrade of the CHAMP+ high-band array on the APEX telescope. These SIS mixers have double-sideband (DSB) noise temperatures from 210 to 400K. The assembled 2SB mixer yields a SSB noise temperature from 450 to 900K, with an IRR above 15dB in 95 of the band. Comparing the DSB and the SSB sensitivities, we find that the waveguide losses are as low as expected and do not exceed 0.6dB. The presented mixer is a prototype for use in a 2SB dual polarization receiver planned for deployment on the APEX telescope.

Original languageEnglish
Pages (from-to)532-539
Number of pages8
JournalIeee transactions on terahertz science and technology
Issue number6
Publication statusPublished - Nov-2019
Event30th International Symposium on Space Terahertz Technology (ISSTT) - Gothenburg, Sweden
Duration: 15-Apr-201917-Apr-2019


  • Mixers
  • Radio frequency
  • Receivers
  • Amplitude modulation
  • Gain
  • Couplers
  • Scattering parameters
  • Image rejection ratio (IRR)
  • sideband separating (2SB) mixers
  • submillimeter wave technology
  • superconductor-insulator-superconductor (SIS) junctions
  • terahertz receivers

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