| Presentation | 2003/10/10 A Tuning Circuit Using Two Distributed Tunnel Junctions for SIS Mixers Yoshinori UZAWA, Masanori TAKEDA, Akira KAWAKAMI, Zhen WANG, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | A novel broadband tuning circuit composed of two low-current-density half-wave tunnel junctions connected by a half-wave microstrip line has been analytically investigated using a simplified model of the circuit. Based on this analysis, we designed, fabricated and tested an all NbN quasi-optical SIS mixer in the 800 GHz band. The mixer used an MgO hyperhemispherical lens with an anti-reflection layer and a twin-slot antenna. The two half-wave junction tuning circuit was integrated in a center-fed twin-slot antenna. Heterodyne measurements showed double-side-band receiver noise temperatures equivalent to 6-9 quanta from 675 to 810 GHz for a mixer with a current density of 6.7 kA/cm^2. The RF bandwidth wasbroader than that of a conventional mixer using a full-wave junction with the same current density. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Low critical current density / Broadband operation / Half-wave junctions / Tuning circuit / Niobium nitride |
| Paper # | SCE2003-20 |
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| Conference Information | |
| Committee | SCE |
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| Conference Date | 2003/10/10(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Superconductive Electronics (SCE) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Tuning Circuit Using Two Distributed Tunnel Junctions for SIS Mixers |
| Sub Title (in English) | |
| Keyword(1) | Low critical current density |
| Keyword(2) | Broadband operation |
| Keyword(3) | Half-wave junctions |
| Keyword(4) | Tuning circuit |
| Keyword(5) | Niobium nitride |
| 1st Author's Name | Yoshinori UZAWA |
| 1st Author's Affiliation | Kansai Advanced Research Center, Communications Research Laboratory() |
| 2nd Author's Name | Masanori TAKEDA |
| 2nd Author's Affiliation | Kansai Advanced Research Center, Communications Research Laboratory |
| 3rd Author's Name | Akira KAWAKAMI |
| 3rd Author's Affiliation | Kansai Advanced Research Center, Communications Research Laboratory |
| 4th Author's Name | Zhen WANG |
| 4th Author's Affiliation | Kansai Advanced Research Center, Communications Research Laboratory |
| Date | 2003/10/10 |
| Paper # | SCE2003-20 |
| Volume (vol) | vol.103 |
| Number (no) | 367 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |