HK1193505B - Coaxial plug-type connector - Google Patents

Description

Coaxial plug-in connector

Technical Field

The invention relates to a coaxial plug-in connector, in particular to a coaxial plug-in connector designed according to DIN47233 and a coaxial plug-in connection formed by two such coaxial plug-in connectors.

Background

Standardized under DIN47223 is a coaxial plug-in connector with a central conductor having an outer diameter of about 7mm and an outer conductor having an inner diameter of about 16 mm. Coaxial plug-in connectors based on DIN47223 are therefore also referred to as 7/16 connectors. Due to the specific ratio between the diameters and the use of air as a dielectric, a characteristic impedance of about 50 Ω is obtained between the mating end of the central conductor and the mating end of the outer conductor.

A coaxial plug-in connector designed according to DIN47223 in the form of a coaxial plug (plug) has an end in the form of a pin of the central conductor at the plug end and this end is inserted into a corresponding end in the form of a socket of the central conductor of a coaxial plug-in connector in the form of a coaxial coupler (coupler). When so inserted, the outer conductor of the coaxial plug is in contact with the outer conductor of the coaxial coupler in both the axial and radial directions, so that the tubular end of the outer conductor of the coaxial plug is pressed against an annular step formed by the inside of the outer conductor of the coaxial coupler. The axial forces required to accomplish this are applied by means of a ring nut as follows: the ring nut is rotatably mounted on one coaxial male connector and screwed onto an external thread provided on the other corresponding coaxial male connector. The screw connection serves at the same time to fix the coaxial plug-in connection against undesired loosening. A coaxial plug-in connector of this type is known, for example, from DE4300243C 1.

In order to keep the intermodulation of the region of the coaxial plug-in connection as low as possible, for certain connections a very low signal-to-noise ratio is specified, which can only be achieved by two coaxial plug-in connectors which form a coaxial plug-in connection being pressed against one another under very high axial forces. For example, when switching on a base station of a mobile telephone network, it is necessary for the ring nut of a coaxial plug-in connection of this type to be tightened with a torque of up to 35Nm in order to achieve the required signal-to-noise ratio. The method of ensuring that a coaxial plug-in connection of this type can be assembled reliably in this way can therefore only be achieved by using a torque wrench of sufficiently large dimensions, which involves considerable effort and expense.

Furthermore, an adapter is known from US6,837,754B1, by means of which a plurality of cables can be connected as a group to the terminal of a transformer. Each of the connections comprises an annular coupling body which is clamped by an annular coupling body belonging to the associated adapter for connection. The contact surface of the coupling body is provided with protrusions and recesses with which corresponding recesses and protrusions on the mating member engage, respectively. In this way, it is attempted to make the contact area between the two contact bodies as large as possible.

Disclosure of Invention

Starting from the above-described prior art, it is an object of the present invention to provide an improved coaxial plug-in connector and a corresponding coaxial plug-in connection formed by two coaxial plug-in connectors of this type. The particular object of the coaxial plug-in connection according to the invention is distinguished by a low intermodulation, which is also achieved by applying only a low axial force to connect two coaxial plug-in connectors.

This object is achieved according to the subject matter of the independent solution. Advantageous embodiments of the coaxial plug-in connector according to the invention and of the coaxial plug-in connection according to the invention form the subject matter of the respective groups of subordinate solutions and can be seen from the following description of the invention.

The idea of the invention is to improve the electrical contact between two conductors pressed against each other, in particular between two outer conductors of a coaxial plug-in connector of this general type, by making the axial surface for the connector contact extend no longer along a (single) radial plane but along at least two, preferably along a plurality of different planes.

The coaxial plug-in connector according to the invention generally has an outer conductor with a contact axial surface for electrically conductive contact with the outer conductor of the second coaxial plug-in connector, a central conductor and an insulator connecting the outer conductor and the central conductor, wherein the contact axial surface of the (at least) outer conductor is provided with one or more protrusions. The preferred plurality of projections creates a defined contact point between the two coaxial plug-in connectors to be connected, at which there is a low signal-to-noise ratio even when the two coaxial plug-in connectors are pressed against each other by only a relatively low axial force. In this way, the assembly of the coaxial plug-in connection, i.e. the connection of the two coaxial plug-in connectors, can be simplified to a large extent.

Each of these coaxial plug-in connections according to the invention has a coaxial plug-in connector in the form of a coaxial plug and a coaxial plug-in connector in the form of a coaxial coupler, at least one of the coaxial plug-in connectors, preferably both coaxial plug-in connectors, being designed according to the invention.

In a preferred embodiment of the coaxial plug-in connector according to the invention, the contact-making axial surface of the outer conductor is provided with a projection tapering to a point. Particularly preferably, these protrusions may be of triangular basic shape (i.e. may have straight sides), thus giving a "saw-tooth" profile to the end face of the outer conductor.

In an alternative embodiment, the contact-making axial surface of the outer conductor of the coaxial plug-in connector according to the invention can equally also have a wave-form projection, for example.

The design of the coaxial plug-in connector according to the invention, i.e. with one or more protrusions which are preferably tapered to a point or wavy, is advantageous even in the case of conventional coaxial plug-in connectors in which the contact-making axial surface connected to the outer conductor extends in a (single) radial plane. However, provision is particularly preferably made for two coaxial plug-in connectors designed according to the invention: in this case, the projections of the two coaxial plug-in connectors can preferably be arranged to engage one another in as much as possible, freely movable manner, in order to make particularly good electrical contact. To this end, the individual protrusions on the respective contacting axial surfaces of the outer conductors are preferably of the same size and are preferably arranged distributed with the same pitch around the contacting (annular) axial surfaces of the respective outer conductors.

In order to secure the coaxial plug-in connection axially against torsion and also to allow sufficient axial forces to be generated, the following can preferably be provided: the outer conductor of the coaxial plug-in connector according to the invention has an external thread or ring nut to allow screwing of the outer conductor to a corresponding second coaxial plug-in connector (the second coaxial plug-in connector having a mating member: ring nut or external thread) for a coaxial plug-in connection. Thus, a first coaxial plug-in connector has an outer conductor with an external thread and a corresponding second coaxial plug-in connector has a ring nut that can be screwed onto the external thread of the first coaxial plug-in connector.

The design of the coaxial plug-in connector according to the invention is particularly suitable for improving other aspects, i.e. in particular with regard to their diameter dimensions, which coaxial plug-in connector is designed according to DIN 47223.

Drawings

The present invention will be described in detail below with reference to embodiments shown in the drawings. In the drawings:

fig. 1 is a longitudinal section of a first embodiment of a coaxial plug-in connection according to the invention.

Fig. 2 is an exploded isometric view of the coaxial plug-in connection shown in fig. 1.

Fig. 3 is a longitudinal section of a second embodiment of a coaxial plug-in connection according to the invention.

Detailed Description

Fig. 1 shows a first embodiment of a coaxial plug-in connection according to the invention, in which two coaxial plug-in connectors according to the invention are connected together.

Each coaxial poke-in connector comprises an outer conductor 1, which outer conductor 1 is conductively connected to a corresponding outer conductor 2 of the coaxial cable. Each coaxial poke-in connector also comprises a central conductor 3, which central conductor 3 is conductively connected to a corresponding central conductor 4 of the coaxial cable. The outer conductor 1 and the central conductor 3 of each coaxial plug-in connector are connected together by an insulator 5 in the form of a disc, in the plugged-together (plugged-together) state of the coaxial plug-in connection an annular space 6 is present in the region of the plug end of the outer conductor 1 and the plug end of the central conductor 3, in which annular space 6 air is provided as a dielectric to insulate the outer conductor 1 and the central conductor 3.

The first coaxial plug-in connector shown on the left-hand side of fig. 1 takes the form of a coaxial coupler 7, the plug end of the centre conductor 3 taking the form of a bush-like form to receive a corresponding end of the pin form of the centre conductor 3 of the second coaxial plug-in connector taking the form of a coaxial plug 8. A radial step 9 is also formed on the inside of the outer conductor 1 of the coaxial coupler 7, which radial step 9 serves as an axial stop for said outer conductor 1, while this radial step 9 serves as an axial surface for said outer conductor to contact the corresponding mating end of the outer conductor 1 of the coaxial plug 8.

The contact-making axial surfaces of the outer conductors 1 of the two coaxial plug-in connectors shown in fig. 1 are in accordance with the invention in the form of serrations, i.e. they form a plurality of identical projections 10 arranged at the same pitch and tapering to a point, which plurality of identical projections 10 engage between identical projections 10 of the contact-making surface of the other outer conductor 1.

In order to securely connect the two coaxial plug-in connectors, the coaxial plug 8 is provided with a ring nut 11, the internal thread of which ring nut 11 engages with a corresponding external thread on the coaxial coupling, the two coaxial plug-in connectors being pressed axially against each other by screwing the two threaded portions together. When the two coaxial plug-in connectors are thus pressed against, a ring nut 11 rotatably mounted on the outer conductor 1 of the coaxial plug 8 is supported against a radial projection 12 on the outer conductor 1 of the coaxial plug 8.

The embodiment of the coaxial plug-in connection according to the invention shown in fig. 3 differs from the embodiment of the coaxial plug-in connection according to the invention shown in fig. 1 only in that: only the coaxial plug 8 designed according to the invention and shown on the right-hand side has serration 10 on the contact-making axial surface of the outer conductor 1. The corresponding axial surface for contacting the outer conductor 1 'of the coaxial coupler 7' on the other hand side is designed according to the prior art, i.e. it lies in a (single) radial plane.

Claims (8)

1. A coaxial plug-in connector having an outer conductor, a central conductor (3) and an insulator (5) connecting the outer conductor and the central conductor (3), the outer conductor having a contact axial surface for electrically conductive contact with another coaxial plug-in connector, characterized in that the contact axial surface of the outer conductor is provided with one or more protrusions (10),

a radial step is provided on the inner side of the outer conductor, which radial step serves as an axial surface of the outer conductor for contacting a corresponding plug-in end of the outer conductor of the further coaxial plug-in connector.

2. Coaxial plug-in connector according to claim 1, characterized in that the contact axial surface is provided with a projection (10) tapering to a point.

3. The coaxial poke-in connector of claim 2, characterized in that the contact axial surface is provided with protrusions in the form of waves.

4. Coaxial plug-in connector according to one of claims 1 to 3, characterized in that the projections (10) are arranged with the same pitch.

5. The coaxial plug-in connector according to one of claims 1 to 3, characterized in that the outer conductor or a housing surrounding the outer conductor has an external thread or a ring nut (11) for connection to another corresponding coaxial plug-in connector.

6. The coaxial plug-in connector according to one of claims 1 to 3, characterized in that it is designed according to DIN 42733.

7. Coaxial plug-in connection with a coaxial plug-in connector in the form of a coaxial plug (8) and a coaxial plug-in connector in the form of a coaxial coupler (7, 7'), at least one of the coaxial plug-in connectors being designed according to one of claims 1 to 6.

8. The coaxial plug-in connection according to claim 7, characterized in that the outer conductor of the coaxial coupler (7, 7') or a housing surrounding the outer conductor has an external thread, the coaxial plug (8) having a ring nut (11) which can be screwed to the external thread.