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Browse Prior Art Database

Screened Tape Cable

IP.com Disclosure Number: IPCOM000061252D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Dunn, GA: AUTHOR

Abstract

A flexible tape cable consists of parallel printed circuit conductors on a lower polyimide film with an upper parallel polyimide strip with spaced holes to leave the central ground conductor exposed. A conductive film is sputtered overall making contact with the ground conductor to provide an external screen. This tape cable gives electrical characteristics equivalent to a coaxial cable. Fig. 1 shows a known tape cable with a lower polyimide film 1 upon which are three printed circuit conductors 2, 2, 3. Central conductor 3 is normally ground. An upper polyimide film 4 is secured to lower film 1 by glue at 5. This cable is only suitable for low frequency application. Fig. 2 shows a screened tape cable with lower film 1, printed circuit conductors 2, 2, 3 and glue 5, as described above.

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Screened Tape Cable

A flexible tape cable consists of parallel printed circuit conductors on a lower polyimide film with an upper parallel polyimide strip with spaced holes to leave the central ground conductor exposed. A conductive film is sputtered overall making contact with the ground conductor to provide an external screen. This tape cable gives electrical characteristics equivalent to a coaxial cable. Fig. 1 shows a known tape cable with a lower polyimide film 1 upon which are three printed circuit conductors 2, 2, 3. Central conductor 3 is normally ground. An upper polyimide film 4 is secured to lower film 1 by glue at 5. This cable is only suitable for low frequency application. Fig. 2 shows a screened tape cable with lower film 1, printed circuit conductors 2, 2, 3 and glue 5, as described above. However, the upper film includes spaced holes 9 to expose central conductor 3. A conductive film 10 is sputtered overall, including holes 9, to provide an external screen making contact with central conductor 3. This construction provides a flexible tape cable with accurately defined characteristic impedance and electrical performance almost equivalent to a coaxial cable and is thus suitable for high frequency applications. Build-up of static electricity is also reduced.

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