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A 385-500 GHz low noise superconductor-insulator-superconductor mixer for ALMA band 8
Shan, WL; Asayama, S; Kamikura, M; Noguchi, T; Shi, S; Sekimoto, Y
2006-02-01
Source PublicationIEICE TRANSACTIONS ON ELECTRONICS
ISSN0916-8524
VolumeE89CIssue:2Pages:170-176
AbstractWe report on the design and experimental results of a fix-tuned Superconductor-Insulator-Superconductor (SIS) mixer for Atacama Large Millimeter/submillimeter Array (ALMA) band 8 (385-500 GHz) receivers. Nb-based SIS junctions of a current density of 10 kA/cm(2) and one micrometer size (fabricated with a two-step lift-off process) are employed to accomplish the ALMA receiver specification, which requires wide frequency coverage as well as low noise temperature. A parallel-connected twin-junction (PCTJ) is designed to resonate at the band center to tune out the junction geometric capacitance. A waveguide-microstrip probe is optimized to have nearly frequency-independent impedance at the probe's feed point, thereby making it easy to match the low-impedance PCTJ over a wide frequency band. The RF embedding impedance is retrieved by fitting the measured pumped I-V curves to confirm good matching between PCTJ and signal source. We demonstrate here a minimum double-sideband receiver noise temperature of 3 times of quantum limits for an intermediate-frequency range of 4-8 GHz. The mixers were measured in band 8 cartridge with a sideband separation scheme. Single-sideband receiver noise below ALMA specification was achieved over the whole band.
KeywordAtacama Large Millimeter/submillimeter Array Noise Temperature Sis Mixer Wideband Performance Sideband Separation
Subject AreaEngineering
WOS HeadingsScience & Technology ; Technology
DOI10.1093/ietele/e89-c.2.170
Indexed BySCI
Language英语
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000235509400013
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/3568
Collection毫米波和亚毫米波技术实验室
Affiliation1.Natl Astron Observ, Mitaka, Tokyo 1818588, Japan
2.Natl Astron Observ China, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Shan, WL,Asayama, S,Kamikura, M,et al. A 385-500 GHz low noise superconductor-insulator-superconductor mixer for ALMA band 8[J]. IEICE TRANSACTIONS ON ELECTRONICS,2006,E89C(2):170-176.
APA Shan, WL,Asayama, S,Kamikura, M,Noguchi, T,Shi, S,&Sekimoto, Y.(2006).A 385-500 GHz low noise superconductor-insulator-superconductor mixer for ALMA band 8.IEICE TRANSACTIONS ON ELECTRONICS,E89C(2),170-176.
MLA Shan, WL,et al."A 385-500 GHz low noise superconductor-insulator-superconductor mixer for ALMA band 8".IEICE TRANSACTIONS ON ELECTRONICS E89C.2(2006):170-176.
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