High power flexible leads for DAS NMR
US6198284A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 13, 1998 |
| Grant date | Mar 6, 2001 |
| Priority date | — |
| Expiry date | Apr 13, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/34092
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A flexible, low-loss, low-capacitance, high-voltage, high-current, moderate-impedance, unshielded, balanced, rf-pulse transmission twinline is produced by etching parallel copper traces on opposite sides of a flexible substrate, spaced apart such that the distance between the conductors is greater than four times the substrate thickness and at least one of the conductors has a width greater than half of the separation between the conductors. A second, similar twinline may be etched on the same substrate beside the first twinline and paralleled at both ends with the first twinline to form a lower-impedance quadline such that alternate conductors in the quadline are on alternate sides of the substrate and have opposite current phases. Both surfaces may be coated with a thin, flexible dielectric to increase the voltage rating for a given conductor separation with minimal affect on propagation factor, attenuation constant, or flexibility. A second, similar quadline on a separate laminate displaced along the normal from the first may be paralleled with the first quadline forming a lower-impedance dual-quadline such that the two laminates have mean spacing comparable to or greater than t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.