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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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
Conference Date 2003/10/10(1days)
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Registration To Superconductive Electronics (SCE)
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