Electrical connectors – Having circuit interrupting provision effected by mating or...
Patent
1996-07-17
1998-11-24
Abrams, Neil
Electrical connectors
Having circuit interrupting provision effected by mating or...
439944, H01R 2900
Patent
active
058399100
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a coaxial connector provided with at least one electrical contact element having a contact side in the form of a coaxial inner and outer contact member for making contact with a further connector, and having a connection side in the form of connection ends, which extend from the inner and outer contact member, for connecting electrical wiring.
2. Brief Description of the Related Art
Coaxial connectors are in practice used on a large scale for radio-frequency (RF) connections in radio and television sets, telecommunication equipment such as telephone sets and the like. Two main groups can be distinguished, i.e. connectors for mounting on a printed-circuit board and cable connectors. In the case of the connectors for mounting on a printed circuit board, a further distinction can be drawn between connectors with connection ends for so-called surface mounting and connectors with connection ends for mounting in a hole in the board (the so-called through-mounting).
A special group is formed by the coaxial connectors provided with switching contacts. This usually involves connectors in which the inner contact member is composed of two switching contact elements. One switching contact element then functions as a contact member for making contact with a further connector, while the other switching contact element forms an auxiliary contact member. In the state where no external contact is made, the two switching contact elements are electrically connected to each other. This connection is automatically broken when contact is made with a further connector.
Connectors of this type are used, for example, in portable, wireless telephone sets which, in addition to their own built-in aerial, must be able to be connected to an external aerial, for example when used in a vehicle. In the state where no external contact is made, the transmission output of the telephone set is coupled, via the switching contact elements, with the aerial built into the set. In the state where external contact is made, the switching contact element, which functions as the inner contact member, connects the transmission output to an external aerial. Of course it is also possible for the outer contact member only or for both the inner and the outer contact member to be provided with switching contact elements.
As is known, care should be taken, when coupling RF coaxial wires, to ensure that the characteristic impedances of the members to be connected are substantially matched, in order to substantially limit losses resulting from reflections and the like. This obviously also applies to the connection elements employed, such as connectors and the like, which, in the case of mounting on a printed-circuit board, may be connected directly to, for example, the transmitting stage on the board.
Coaxial connectors provided with means for impedance control or matching are known from the prior art. See, for example, U.S. Pat. Nos. 3,873,785 and 4,749,968. In order to achieve a desired impedance, use is made of passive electronic components such as resistors, coils and capacitors which are accommodated in the connector casing. In addition to the fact that these components take up relatively large amounts of space, which has an adverse effect on the dimensions of the connectors, it is disadvantageous also from the assembly point of view to mount separate resistors, coils and the like in the connector casing and connect them electrically to the contact members in question.
A coaxial connector as described in the first paragraph of the description is known from U.S. Pat. No. 5,222,149. The known device is a damping terminator for suppressing spurious current flow in high fidelity audio frequency equipment. The termination element includes a conductive-film-covered ferromagnetic-core electrical damping element which is to be inductively coupled to potential signal carrying components.
SUMMARY OF THE INVENTION
The object of the invention is, in the first instance, to provide a coa
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Meller Andrew Graham
Paagman Bernardus Lambertus Franciscus
Pardoel Michel Gerardus
Abrams Neil
Berg Technology Inc.
Long Daniel J.
Page M. Richard
Standig Barry M. L.
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