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Micro coaxial termination in PTH structure and method.

IP.com Disclosure Number: IPCOM000013020D
Original Publication Date: 2002-Mar-14
Included in the Prior Art Database: 2003-Jun-12
Document File: 1 page(s) / 36K

Publishing Venue

IBM

Abstract

The present invention discloses a Plated-through hole (PTH) structure which allows termination of mini coaxial cables directly into a printed circuit board PTH without a conventional coax termination connector. This allows high density coax cable connections into a circuit board, without the added cost and noise associated with the additional connection hardware. The invention can use either a semi conventional PTH, or a special PTH with a stepped configuration to accept a stripped, raw mini coaxial cable end which is conventionally soldered into the board. When the stepped hole structure is used the central signal wire is solder attached to the smaller diameter portion of the PTH barrel. The outer shielded cable portion is solder attached to the larger diameter portion of the PTH. The two PTH segments are electrically isolated at the step. When the semi conventional hole structure is used the middle signal conductor is soldered into the hole and the outer shield is soldered to a ground pad on the outside surface of the board. The invention allows very dense, low noise attachment of coaxial cables directly to high speed digital and telecom microwave circuit boards. The technique could even allow discrete wire connections for critical nets to be made between locations on the same board.

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Micro coaxial termination in PTH structure and method.

    The present invention discloses a Plated-through hole (PTH) structure which allows termination of mini coaxial cables directly into a printed circuit board PTH without a conventional coax termination connector. This allows high density coax cable connections into a circuit board, without the added cost and noise associated with the additional connection hardware. The invention can use either a semi conventional PTH, or a special PTH with a stepped configuration to accept a stripped, raw mini coaxial cable end which is conventionally soldered into the board. When the stepped hole structure is used the central signal wire is solder attached to the smaller diameter portion of the PTH barrel. The outer shielded cable portion is solder attached to the larger diameter portion of the PTH. The two PTH segments are electrically isolated at the step. When the semi conventional hole structure is used the middle signal conductor is soldered into the hole and the outer shield is soldered to a ground pad on the outside surface of the board. The invention allows very dense, low noise attachment of coaxial cables directly to high speed digital and telecom microwave circuit boards. The technique could even allow discrete wire connections for critical nets to be made between locations on the same board.

    A diagrammatic sketch of the stepped hole with a mini coax cable soldered in and a cross section drawing showing one cross se...