Superconductive delay-line technology and applications
Microwave analog signal-processing filters were realized in the form of coupled niobium striplines on silicon dielectric substrates. Device responses with + or - 2-dB amplitude accuracy and 9 deg -rms phase error have been achieve 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-micron-thick wafers is limited to about 40 ns by the electromagnetic coupling between neighboring lines. To achieve greater dispersion two approaches are under development: (1) 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 micron) single-crystal silicon superstrates supported by thicker substrates has been demonstrated and preliminary results will be described.
- Research Organization:
- Massachusetts Inst. of Tech., Lexington (USA). Lincoln Lab.
- OSTI ID:
- 6399385
- Report Number(s):
- AD-A-159799/6/XAB; MS-6711
- Country of Publication:
- United States
- Language:
- English
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANALOG SYSTEMS
DELAY CIRCUITS
DISPERSIONS
ELECTROMAGNETIC RADIATION
ELECTRONIC CIRCUITS
ELEMENTS
ERRORS
MECHANICAL PROPERTIES
METALS
NIOBIUM
RADIATIONS
SEMIMETALS
SILICON
SUBSTRATES
SUPERCONDUCTING DEVICES
TRANSITION ELEMENTS