Browse Prior Art Database

High-Vacuum/High-Frequency/High-Density Flex Cable

IP.com Disclosure Number: IPCOM000121032D
Original Publication Date: 1991-Jul-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 3 page(s) / 118K

Publishing Venue

IBM

Related People

Argyrakis, SN: AUTHOR

Abstract

A state-of-the-art KAPTON*-based flex cable has been designed to answer the complex requirements of high-speed digital testing in a high- vacuum environment.

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This is the abbreviated version, containing approximately 53% of the total text.

High-Vacuum/High-Frequency/High-Density Flex Cable

      A state-of-the-art KAPTON*-based flex cable has been
designed to answer the complex requirements of high-speed digital
testing in a high- vacuum environment.

      With advancements in high-vacuum analysis equipment, it is
often necessary to cable high-frequency signals into a vacuum
chamber.  The traditional method for this application requires the
potting of coaxial cables in a bulkhead feedthru flange.  In vacuum
systems where 1 X 10-7 Torr pressures are common, the coaxial cable
must be broken down to its smallest component and backfilled with an
appropriate low vapor pressure compound.  This procedure changes the
original transmission-line characteristics of the cable and causes
serious impedance mismatch in the system.

      In addition to the electrical problems experienced with this
method, coaxial cables can trap air inside the center conductors of
the wire resulting in a substantial load on the vacuum pump, causing
increased pumpdown time schedules.

      In applications where high signal density is required, large
surface areas are required to feed in the coaxial cables.  In many
circumstances, there is a physical limitation in the number of cables
used.  Also, if the vacuum system contains an X, Y, Z stage to which
two cables must be attached, a severe load on the stage can result.

      A flex cable has been designed to solve these complex problems.
The body of the cable featu...