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Printed Conductor Patterns

IP.com Disclosure Number: IPCOM000095201D
Original Publication Date: 1965-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Truslove, DJ: AUTHOR

Abstract

When using stacks of flexible tapes carrying similar patterns of printed conductors, capacitance exists between corresponding conductors on overlying adjacent tapes. Capacitance is reduced to some extent by ensuring, wherever possible, that conductors on overlying adjacent tapes do not lie directly one above the other. That is, they are spaced as far apart as the circuitry permits. However, due to relative movement between these tapes caused by tape shrinkage, etc., conductors initially spaced apart can end up overlying one another. Thus, interconductor capacitance increases.

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Printed Conductor Patterns

When using stacks of flexible tapes carrying similar patterns of printed conductors, capacitance exists between corresponding conductors on overlying adjacent tapes. Capacitance is reduced to some extent by ensuring, wherever possible, that conductors on overlying adjacent tapes do not lie directly one above the other. That is, they are spaced as far apart as the circuitry permits. However, due to relative movement between these tapes caused by tape shrinkage, etc., conductors initially spaced apart can end up overlying one another. Thus, interconductor capacitance increases.

Capacitive coupling cannot be eliminated altogether but can be reduced. Conductors on a tape are arranged so that they are not parallel to corresponding conductors on an adjacent tape. Then should relative movement between tapes occur, either in a longitudinal or a lateral direction, a conductor on one tape does not lie directly over a corresponding conductor on an adjacent tape. In the worst case, corresponding conductors only crossover one another at an angle.

Capacitive coupling exists between conductors at these crossover points. This is greater than the coupling between spaced-apart parallel conductors. It is less than the coupling between parallel conductors which directly overlie one another. This arrangement results in the interconductor capacitance being maintained at an acceptable value. Unless tape skew takes place, the value remains constant even though...