NDLI: Thermal noise of microwave superconducting filter-amplifier combinations

Content Provider	IEEE Xplore Digital Library
Author	Jutzi, W. Wuensch, S. Mattes, H. Schaefer, F. Lochner, O.
Copyright Year	2002
Abstract	Superconducting filters in radioastronomical receiver frontends at cm-wavelengths may eliminate nearby terrestrial interference signals since they offer very high frequency selectivity and extremely small insertion loss. Moreover, power in unwanted intermodulation signals is sufficiently small at the expected input levels. On the other hand thermal noise outside the passband of a filter-amplifier combination may affect the receiver performance. The overall thermal noise of superconducting filters with Butterworth or quasi-elliptic characteristic connected via a 50 /spl Omega/ transmission line of finite length with a low noise amplifier is investigated. Arrangements with very low noise outside the passband are described. Simulated and measured thermal noise spectra are in reasonable agreement.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1012
Ending Page	1015
Page Count	4
File Size	462915
File Format	PDF
ISSN	10518223
Volume Number	15
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Superconducting device noise Superconducting filters Superconducting microwave devices Microwave filters Superconducting transmission lines Passband Interference elimination Radiofrequency interference RF signals Frequency thermal noise
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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