Superconductive delay-line technology and applications
Microwave analog signal-processing filters have been realized in the form of coupled niobium striplines on silicon dielectric substrates. Device responses with + or - 2-dB amplitude accuracy and 9/sup 0/ -rms phase error have been achieved in amplitude-weighted filters with 37.5 ns of dispersion and 2.3-GHz bandwidths. Relative side-lobe levels of -26 dB and less are currently obtained. The achievable dispersion for stripline circuits on a single pair of 5-cm-diameter, 125-..mu..m-thick wafers is limited to about 40 ns by the electromagnetic coupling between neighboring lines. To achieve greater dispersion two approaches are under development: Stripline circuits are being fabricated on multiple wafer pairs which are physically stacked and electrically concatenated to produce dispersive delay lines with 4-GHz bandwidth and 75-ns dispersion time. Phenolic resin is used as an adhesive to ensure the mechanical integrity of the stacked structure. (2) A technique to fabricate dense stripline circuits on very thin (15-..mu..m) single-crystal silicon superstrates supported by thicker substrates has been demonstrated and preliminary results will be described. A chirp-transform system capable of real-time spectral analysis has been constructed using a pair of the superconductive delay-line filters. A resolution of 43 MHz over an unprecedented 2400-MHz bandwidth with amplitude uniformity of + or - 1 dB and side-lobe levels of -18 dB was demonstrated.
- Research Organization:
- Lincoln Laboratory, Massachusetts Institute of Technology, Lexington, MA
- OSTI ID:
- 6346606
- Report Number(s):
- CONF-840937-
- Journal Information:
- IEEE Trans. Magn.; (United States), Vol. MAG-21:2; Conference: Applied superconductivity conference, San Diego, CA, USA, 9 Sep 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
ANALOG SYSTEMS
ELECTRONIC CIRCUITS
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ACCURACY
AMPLITUDES
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NIOBIUM
SILICON
COMPOSITE MATERIALS
ELEMENTS
MATERIALS
METALS
PROCESSING
SEMIMETALS
TRANSITION ELEMENTS
420201* - Engineering- Cryogenic Equipment & Devices