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Antenna arrangement

Antenna arrangement description/claims

The present invention relates to communications systems and more particularly to an antenna and a module for locating user equipment in a communications system.

The accurate location of user equipment, such as a GSM (Global System for Mobile Communications) mobile device, cannot be determined using the information from a cellular network. The information enables the location only of an accuracy of about 100-300 meters in rural areas and 50-100 meters in city areas. For example, in a case of an emergency call, it is vital to find out the exact location from which the call was made to be able to get help to the site as fast as possible.

For better accuracy, one possibility is the use of GPS (Global Positioning System) receivers, which offer better accuracy. However, they are expensive and not widely carried and used by public. In addition, GPS receivers do not work reliably or at all indoors and in canyons, like in between high buildings.

Another possibility is to add high accuracy satellite positioning system functionality to the existing non-satellite positioning system user equipment without any modifications to the equipment itself but only by inserting a subscriber identity module, a SIM card comprising a satellite positioning system receiver and an antenna.

However, the problem with the SIM card with such a receiver and especially an antenna is the radio signal reception. One of the disadvantages associated with the above arrangement is that the receiver and antenna are inside the mobile device in proximity of a ground plane and other metallic parts and often covered with a battery. In this kind of circumstances traditional antennas are too big and do not work.

It is thus an object of the present invention to provide an apparatus to solve the above problems. The objects of the invention are achieved by an arrangement, which is characterized by what is stated in the independent claims. The preferred embodiments of the invention are disclosed in the dependent claims.

The invention is based on the idea of providing an antenna for use in a mobile device, the antenna being characterized in that it comprises means for receiving a signal from a satellite positioning system, a first layer of dielectric material and a second layer of dielectric material, wherein the means for receiving the signal is at least partly between the first dielectric layer and the second dielectric layer.

It is an advantage of the arrangement of the invention that the GPS receiver can be used in circumstances where traditional antennas would not work.

In the following the invention will be described in greater detail by means of preferred embodiments with reference to the attached drawings, in which

FIG. 1 shows a cross section view of a mobile device;

FIG. 2A shows a subscriber identity module according to the invention and its embodiments;

FIG. 2B shows a cross section view of the subscriber identity module according to the invention and its embodiments;

FIG. 3 illustrates an antenna structure according to the invention and its embodiments;

FIG. 4 illustrates an antenna structure according to the invention and its embodiments;

FIG. 5 illustrates an antenna structure according to the invention and its embodiments;

FIG. 6A shows a subscriber identity module according to the invention and its embodiments;

• Provisional Patent
• Utility Patent

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