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Matched Impedance Coaxial Cable Connector

IP.com Disclosure Number: IPCOM000082118D
Original Publication Date: 1974-Oct-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Morton, RM: AUTHOR

Abstract

This stripline printed-circuit connector is useful for attaching coaxial cables that carry signal frequencies up to approximately one gigahertz. In particular, it is advantageous as a multicontact coaxial cable connector that requires very low-impedance mismatch through the connector, typically +/- 1 ohm.

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Matched Impedance Coaxial Cable Connector

This stripline printed-circuit connector is useful for attaching coaxial cables that carry signal frequencies up to approximately one gigahertz. In particular, it is advantageous as a multicontact coaxial cable connector that requires very low- impedance mismatch through the connector, typically +/- 1 ohm.

As shown in the figure, the connector basically comprises two sections of stripline which are butted and electrically joined by contact surface 6 and leaf spring contact 7. Contact 6 is preferably goldplated. The stripline connectors comprise dielectric material such as glass 3 and 3', respectively, copper signal lines 4 and 4', respectively, and copper ground planes 5 and 5', respectively. Housing 8 serves both to protect the contacts 6, 7 and also to further reduce the discontinuity caused by dimension A, which is needed to allow flexure of the leaf contact 7. Dimension A must be minimized to reduce the impedance discontinuity at the interface.

The coaxial cables are joined to the stripline pieces distal from the butted joint. Each printed-circuit card is preferably fabricated with a solderable support piece 9, having a step to match the thickness of the cable with that of the printed- circuit glass. The characteristic impedance of the stripline printed-circuit connector is designed to match the impedance of the coaxial cable, by carefully defining the thickness and the dielectric constant of glass 3 and the width of ...