Investigation of the performance of an SIS mixer with Nb-AlN-NbN tunnel junctions in the 780–950 GHz frequency band
In this paper, we present preliminary measured performance of an SIS mixer employing a Nb/AIN/NbN tunnel junction in the frequency range of 780–950 GHz range. The mixer design is an upgrade of the Carbon Heterodyne Array of the Max-Planck-Institute Plus (CHAMP+) mixer, coupled with an easy to fabric...
| Main Authors: | , , , , , , , , , |
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| Format: | Conference item |
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National Radio
Astronomy Observatory
2018
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| _version_ | 1826292379912503296 |
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| author | Tan, B Mahashabde, S Hector, A Yassin, G Khudchenko, A Hesper, R Baryshev, A Dmitriev, P Rudakov, K Koshelets, V |
| author_facet | Tan, B Mahashabde, S Hector, A Yassin, G Khudchenko, A Hesper, R Baryshev, A Dmitriev, P Rudakov, K Koshelets, V |
| author_sort | Tan, B |
| collection | OXFORD |
| description | In this paper, we present preliminary measured performance of an SIS mixer employing a Nb/AIN/NbN tunnel junction in the frequency range of 780–950 GHz range. The mixer design is an upgrade of the Carbon Heterodyne Array of the Max-Planck-Institute Plus (CHAMP+) mixer, coupled with an easy to fabricate smooth-walled horn. The noise temperature of the mixer is measured using the standard Y-factor method, but all the RF optics is enclosed in the cryostat. We use a rotating mirror in the cryostat to switch between a room temperature load and a 4 K blackbody load. With this method, we have measured a noise temperature of 330 K around 850 GHz, corrected for a mismatch between a reduced height rectangular waveguide at the input of the mixer block and a full height waveguide at the output of the horn. To remove this mismatch we now plan to redesign a new mixer chip with a full-height waveguide backpiece. The expected performance of the new mixer chip is also reported. |
| first_indexed | 2024-03-07T03:13:47Z |
| format | Conference item |
| id | oxford-uuid:b5194fa4-3284-45e5-aac2-6dd9cb44f6c4 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T03:13:47Z |
| publishDate | 2018 |
| publisher | National Radio
Astronomy Observatory |
| record_format | dspace |
| spelling | oxford-uuid:b5194fa4-3284-45e5-aac2-6dd9cb44f6c42022-03-27T04:30:54ZInvestigation of the performance of an SIS mixer with Nb-AlN-NbN tunnel junctions in the 780–950 GHz frequency bandConference itemhttp://purl.org/coar/resource_type/c_5794uuid:b5194fa4-3284-45e5-aac2-6dd9cb44f6c4Symplectic Elements at OxfordNational Radio Astronomy Observatory2018Tan, BMahashabde, SHector, AYassin, GKhudchenko, AHesper, RBaryshev, ADmitriev, PRudakov, KKoshelets, VIn this paper, we present preliminary measured performance of an SIS mixer employing a Nb/AIN/NbN tunnel junction in the frequency range of 780–950 GHz range. The mixer design is an upgrade of the Carbon Heterodyne Array of the Max-Planck-Institute Plus (CHAMP+) mixer, coupled with an easy to fabricate smooth-walled horn. The noise temperature of the mixer is measured using the standard Y-factor method, but all the RF optics is enclosed in the cryostat. We use a rotating mirror in the cryostat to switch between a room temperature load and a 4 K blackbody load. With this method, we have measured a noise temperature of 330 K around 850 GHz, corrected for a mismatch between a reduced height rectangular waveguide at the input of the mixer block and a full height waveguide at the output of the horn. To remove this mismatch we now plan to redesign a new mixer chip with a full-height waveguide backpiece. The expected performance of the new mixer chip is also reported. |
| spellingShingle | Tan, B Mahashabde, S Hector, A Yassin, G Khudchenko, A Hesper, R Baryshev, A Dmitriev, P Rudakov, K Koshelets, V Investigation of the performance of an SIS mixer with Nb-AlN-NbN tunnel junctions in the 780–950 GHz frequency band |
| title | Investigation of the performance of an SIS mixer with Nb-AlN-NbN tunnel junctions in the 780–950 GHz frequency band |
| title_full | Investigation of the performance of an SIS mixer with Nb-AlN-NbN tunnel junctions in the 780–950 GHz frequency band |
| title_fullStr | Investigation of the performance of an SIS mixer with Nb-AlN-NbN tunnel junctions in the 780–950 GHz frequency band |
| title_full_unstemmed | Investigation of the performance of an SIS mixer with Nb-AlN-NbN tunnel junctions in the 780–950 GHz frequency band |
| title_short | Investigation of the performance of an SIS mixer with Nb-AlN-NbN tunnel junctions in the 780–950 GHz frequency band |
| title_sort | investigation of the performance of an sis mixer with nb aln nbn tunnel junctions in the 780 950 ghz frequency band |
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