WO2001056112A1

WO2001056112A1 - Antenna for a communications device

Info

Publication number: WO2001056112A1
Application number: PCT/DE2001/000296
Authority: WO
Inventors: Thomas Richter; Sheng-Gen Pan
Original assignee: Siemens Aktiengesellschaft
Priority date: 2000-01-25
Filing date: 2001-01-25
Publication date: 2001-08-02

Abstract

The invention relates to an antenna, comprising an electrically conducting antenna component and a plastic sleeve for housing said component, whereby the antenna structure is laterally defined by flanges. The both flanges are each located in guide grooves, in the plastic sleeve, whereby a first moulding in the front region of a flange is formed, such that it serves to precentre the antenna structure, whilst a second moulding in the back region of the through flange is formed, such that it engages in the plastic of the plastic sleeve.

Description

description

Antenna for a communication device

The present invention relates to an antenna for a communication device, consisting of an electrically conductive antenna structure and a plastic grommet accommodating the same, the antenna structure having a width on the one side from a first web which is continuous in the longitudinal direction and on the other side from a continuous or multiply subdivided second web is limited.

Such an antenna structure is e.g. in German patent application 19 918 060.1 have been proposed. Such antenna structures are encased by pushing the antenna structure into a plastic grommet or, conversely, pushing the plastic grommet onto the antenna structure.

This requires good guidance during the assembly process and a secure hold of the antenna structure within the plastic grommet after the assembly process, even when subjected to mechanical loads, so that the antenna structure cannot be deformed.

The object of the present invention is to provide an antenna of the type mentioned at the outset, in which there is good guidance during the actual fitting process and a secure hold of the antenna structure within the plastic grommet after the fitting process.

This object is achieved according to the invention for the above-mentioned antenna in that the two webs of the antenna structure are each guided in guide grooves of the plastic sleeve, the width of which is slightly wider than the thickness of the webs, that the guide groove for the continuous web is designed as a T-groove, being one in the front of the is forms a continuous web provided first embossing such ^¬ out, that it serves for pre-centering of the antenna structure, while an opening provided in the rear area of the continuous web second embossing is formed such that it digs into the plastic.

In the antenna according to the invention, sufficient guidance is ensured while the plastic casing is being fitted with the antenna structure, while in the finished antenna there is a secure hold for the antenna structure within the grommet.

An expedient development of the antenna according to the invention is characterized in that a forward-facing nose is provided at the front end of the continuous web which engages in a corresponding recess in the plastic grommet when the antenna structure is inserted.

The nose at the end of the bridge ensures a shock-proof locking of the antenna structure within the plastic grommet even when there is lateral force.

Further expedient refinements of the present invention result from the subclaims and from a subsequent description of an exemplary embodiment with reference to the attached drawing.

Show it

FIG. 1 shows a perspective illustration of an antenna structure constructed according to the invention,

FIG. 2 shows a first perspective view of a plastic grommet with an inserted antenna structure according to the present invention, 3 shows a second perspective view of a plastic ^¬ spout with inserted antenna structure according to the vorlie ^¬ constricting invention,

Figure 4 is a partial plan view from behind a Art ^¬ stofftülle with inserted antenna structure,

5 shows a further perspective illustration of a plastic grommet with an inserted antenna structure according to the present invention, and

Figure 6 shows a cross section through a plastic grommet with an inserted antenna structure in plan view.

The antenna shown in Figure 1 has a helical shape

Basic structure. This helical basic structure is realized in that convexly curved antenna elements 6, 7 with mutually opposite bends or curvatures are alternately arranged in such a way that an antenna element 7 bent downwards follows an antenna element 6 bent upwards and vice versa. The adjacent ends of two adjacent antenna elements 6, 7 are connected to one another via webs 8, 9 and 10, 11, which are preferably straight and run in the longitudinal direction of the antenna or helix, in such a way that the individual antenna elements 6, 7 are connected in series results and the helix structure shown in FIG. 1 is formed.

Furthermore, the antenna structure shown in FIG. 1 has a further antenna element 2 which is connected in parallel and which is connected at the lower longitudinal end of the antenna to one end of the first antenna element 6 in the longitudinal direction of the antenna and to an antenna contact spring 13. This further antenna element 2 runs in particular in the same plane as the connecting webs 8, 9, 10, 11 parallel to the helical basic structure of the antenna and is also arranged in such a way that there are no overlaps. 00 J t K) P ¹ P ¹

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the antenna structure 1 is guaranteed within the plastic grommet 20.

The contact arm 13 is connected to the antenna structure. In the lower area this is angled and, when the antenna structure 1 is inserted, is pushed into the plastic grommet 20 behind a plastic web 26. This ensures that the bending moment that occurs is taken up during contacting and thus deflection of the contact arm 13. The spherical contact cap 14 ensures point contact on an electronic assembly.

As a further element, the diagonal web 16 increases the overall rigidity of the antenna structure.

Claims

claims

1. Antenna for a communication device, consisting of an electrically conductive antenna structure and a plastic grommet that accommodates it, the antenna structure being limited in width on one side by a longitudinal web that is continuous in the longitudinal direction and on the other side by a continuous or multiply divided second web characterized in that the two webs (2; 8, 10) of the antenna structure (1) are each guided in guide grooves (21, 22) of the plastic grommet (20), the width of which is slightly wider than the thickness of the webs (2; 8 , 10) is that the guide groove (21) for the continuous web (2) is designed as a T-groove (21, 23), a first embossing (3) provided in the front region of the continuous web (2) being such is designed such that it serves for pre-centering the antenna structure (1), while a second embossing (4) provided in the rear region of the continuous web (2) is designed such that it s I dig into the plastic of the plastic grommet (20).

2. Antenna according to claim 1, characterized in that at the front end of the continuous web (2) a forward nose (5) is provided, which engages in a corresponding recess of the plastic sleeve (20) in the inserted state of the antenna structure (1) ,

3. Antenna according to claim 2, characterized in that a forward-facing nose (12) is provided at the front end of the continuous or multiply divided second web (8, 10), which in the inserted state of the antenna structure into a corresponding recess of the Plastic grommet (20) engages.