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Design and development of SIS mixers for ALMA band 8
Shan, WL; Noguchi, T; Shi, SC; Sekimoto, Y
AbstractIn this paper, we 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. Parallel-connected twin junctions (PCTJ) are 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 much easier to match the low-impedance PCTJ over a wide frequency band. In addition, a superconducting magnet fixed onto the compact mixer block to provide efficient magnetic field coupling is designed. The SIS mixer demonstrates a minimum double-sideband receiver noise temperature of 108 K at the band center and temperatures of less than 167 K over the whole band (for an intermediate-frequency range of 4-8 GHz).
KeywordAtacama Large Millimeter/submillimeter Array Noise Temperature Sis Mixer Wideband Performance
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
Indexed ByISTP ; SCI
WOS Research AreaEngineering ; Physics
WOS SubjectEngineering, Electrical & Electronic ; Physics, Applied
WOS IDWOS:000229765300106
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Natl Astron Observ, Nobeyama Radio Observ, Minamisa Ku, Nagano 3841305, Japan
2.Natl Astron Observ China, Purple Mt Observ, Nanjing 210008, Peoples R China
3.Natl Astron Observ, Mitaka, Tokyo 1818588, Japan
Recommended Citation
GB/T 7714
Shan, WL,Noguchi, T,Shi, SC,et al. Design and development of SIS mixers for ALMA band 8[J]. IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY,2005,15(2):503-506.
APA Shan, WL,Noguchi, T,Shi, SC,&Sekimoto, Y.(2005).Design and development of SIS mixers for ALMA band 8.IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY,15(2),503-506.
MLA Shan, WL,et al."Design and development of SIS mixers for ALMA band 8".IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 15.2(2005):503-506.
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