Electrical cable device

Details Electrical cable device Electrical cable device

1998-09-24

2001-08-28

Gaffin, Jeffrey (Department: 2841)

Electricity: conductors and insulators

Conduits, cables or conductors

Preformed panel circuit arrangement

C174S268000

Reexamination Certificate

active

06281451

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to electronics systems and more particularly to a connecting cable construction for use in connecting components of electronics systems.
BACKGROUND OF THE INVENTION
High performance electronics and computer systems employ state-of-the-art connecting cables to connect components, such as circuit boards, to each other. In computer systems for example, CPU (central processing unit) boards or motherboards are connected together and also to subsystem boards including I/O (input-output) boards and adapter boards. All of the interconnected boards contain ICs (integrated circuits) or ASICs (application specific integrated circuits) along with other components and generally perform one or more specific functions related to the operation of the system as a whole.
High wiring density, high wiring count, ease of termination to connectors, low noise and cross-talk and low cost are some of the main requirements to be met in the design of such connecting cables. Coaxial cables generally cannot meet density or cost requirements. So called “ribbon” cables cannot meet many performance requirements (noise, cross-talk) or density requirements. Standard flexible-circuit or flex cables are better suited for high density, low cost applications with low to medium performance requirements. Flex cables in some cases offer excellent performance but the performance degrades as wiring density is increased. Moreover, some flex cables often result in excessive and undesirable EMI (electromagnetic interference) problems.
Accordingly, there is a need for an enhanced connector cable construction which is effective to provide improved wiring density capacity with low noise and cross-talk characteristics and which is relatively inexpensive to manufacture and does not produce excessive EMI radiation.
SUMMARY OF THE INVENTION
A flexible quadplate cable construction is provided which includes at least four metal layers with at least three interposed dielectric layers. In an exemplary embodiment, the four metal layers include two outside layers enclosing the cable construction and two internal conductor layers. Each of the internal conductor layers includes alternating signal traces and ground traces. The internal conductor layers are arranged with signal traces of one internal conductor layer being opposite ground traces of the other internal conductor layer. In another example, transverse vias are positioned at points across the width of the cable to minimize antenna effects at enclosure entry points and longitudinal vias are positioned at the edges along the length of the cable to maintain the potential of ground planes at the same level and to improve shielding effectiveness.


REFERENCES:
patent: 3932932 (1976-01-01), Goodman
patent: 4639693 (1987-01-01), Suzuki et al.
patent: 5844783 (1998-12-01), Kojima
patent: 5986893 (1999-11-01), Leigh et al.
patent: 6010769 (2000-01-01), Sasaoka et al.

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