WO2009092342A1

WO2009092342A1 - Arrangement comprising a mobile communication terminal and at least one rfid transponder

Info

Publication number: WO2009092342A1
Application number: PCT/DE2008/002129
Authority: WO
Inventors: Soheil Hamedani
Original assignee: Soheil Hamedani
Priority date: 2008-01-23
Filing date: 2008-12-18
Publication date: 2009-07-30
Also published as: DE102008005795A1

Abstract

The invention relates to an arrangement comprising a mobile communication terminal (1) and at least one RFID transponder (2), wherein the mobile communication terminal (1) has at least one accumulator unit (5), which is received in the housing (1.1) of the mobile communication terminal (1), and wherein the RFID transponder (2) has at least one RFID chip (2.2) and at least one antenna structure (2.3) connected thereto. In a particularly advantageous embodiment, the RFID transponder (2) has at least one film or substrate layer (2.1) and on the top (2’) thereof the RFID chip (2.2) and the antenna structure (2.3) are disposed, and on the bottom (2’) thereof at least one shielding layer (2.4) is disposed, wherein the shielding layer (2.4) is formed by an arrangement of a plurality of highly permeable particles (2.5) in the region of the spatial expansion of the antenna structure (2.3). To this end, the RFID transponder (2) is directly or indirectly connected to the accumulator unit (5) via the at least one shielding layer (2.4).

Description

Arrangement consisting of a mobile communication terminal and at least one RFID transponder

The invention relates to an arrangement consisting of a mobile communication terminal and at least one RFID transponder according to the preamble of claim 1.

Increasingly, non-contact identification systems are used, for example for access control or time recording, whose data transmission is based essentially on RFID technology. The abbreviation RFID stands for "Radio Frequency Identification" and refers to an identification by means of radio waves or electromagnetic waves.These RFID systems are used, for example, in the automotive sector, namely they enable the remote-controlled opening and closing of a vehicle.

Conventional RFID systems consist of a stationary or mobile RFI D reader and an RFID transponder which consists of an RFID chip interacting with an antenna arrangement. The RFI D reader also includes an antenna array over which an electromagnetic field is generated. If the RFID transponder is brought into the electromagnetic field of the RFI D reading device, an inductive signal coupling results between the antenna arrangements of the RF I D reading device or the RFID transponder formed by conductor loops. At least one unidirectional transmission of data or identification information from the RFID transponder to the RFI D reading device is realized by attenuation modulation of the electromagnetic field generated by the RF I D reader. Such RFID systems operate, for example, at a frequency of 125 kHz to 13.56 MHz. RFID transponders of this type can be embodied as so-called "smart labeis" in which, for example, the antenna arrangement and the RFID chip are adhesively bonded to a self-adhesive film, which may possibly be coated with a protective layer of plastic Transponder designed as a passive unit, ie the energy required to operate the RFID transponder is taken from the electromagnetic field of the RFI D reader.

The application of preferably passive RFID transponders on plastic surfaces is usually problem-free. The operation of such RFID transponders in the immediate vicinity of electrically and / or magnetically conductive materials, in particular conductive surfaces with at least a significant metal content are induced due to the alternating magnetic flux in the electrically and / or magnetically conductive material eddy currents, causing the generated electromagnetic field the surface of the respective object is so strongly attenuated that the data transmission of the on-surface RFID transponder is hindered, and so strong that no usable data can be received by the RFI D reader more.

The shielding of such high-frequency fields is a problem in the art, which in the case of RFID technology is determined by the geometry of the antenna structure arranged in close proximity to the conducting layer. This problem can be solved by arranging highly permeable materials such as ferrites or special alloys between the antenna array formed by a conductor loop and the metal surface and orienting them appropriately to substantially eliminate the induced eddy currents. For this purpose, for example, ferrite foils are used for shielding.

From DE 101 49 126 A1, for example, a method for producing such a shield for an RFID transponder and an associated Transponder known, wherein the RFID transponder has at least one antenna structure and an RFID chip. The antenna structure formed by a conductor loop has a spatial extent. The shield here consists of a ferromagnetic particles applied to a substrate, which are adapted to the spatial extent of the antenna structure and which are aligned relative to a direct magnetic field such that the ferromagnetic particles after attaching the substrate to the RFID transponder parallel to a in the antenna structure of the transponder induced magnetic field are.

From DE 102 08 478 AI, for example, based on the RFI D technology input device is known, which may be integrated in a communication device such as a mobile device or a small portable computer and a personal digital assistant. In this case, the input device has a sensor circuit board on which an exciter coil and at least one sensor coil are provided, which are connected to a control device. The disadvantage of such an input device is technically complex and has an enormous amount of space.

Based on the known prior art, the present invention seeks to provide an arrangement consisting of a mobile communication terminal and at least one RFIDrTransponder, in which the possibility of operating an RFID transponder in a metal environment having mobile communication device and in which by Induced eddy currents caused disturbances of data transmission are significantly reduced. The object is achieved on the basis of the features of the preamble of claim 1 by its characterizing features. The essential aspect of the arrangement according to the invention is to be seen in that the RFID transponder has at least one film or substrate layer, on the upper side of the RFID chip and the antenna structure and on the underside at least one shielding layer are arranged, wherein the at least shielding layer by a Arrangement of a plurality of highly permeable particles in the region of the spatial extent of the antenna structure is formed and the RFID transponder via the at least one shielding layer is directly or indirectly in communication with the accumulator unit. By providing the shielding layer, the trouble-free operation of a preferably passive RFID transponder within the "battery compartment" of a mobile communication device is particularly advantageous, resulting in a multitude of new application and application possibilities. Map of a mobile phone, so that the deposited in the RFID chip code for commissioning the SIM card is required or that on the RFID chip means of payment are deposited in the form of currency units that are used for automated payment.

Further advantageous embodiments of the invention can be found in the further claims. The invention will be explained in more detail with reference to an embodiment with reference to drawings. Show it:

1 is a schematic block diagram of the inventive arrangement consisting of a mobile communication terminal with an RFID transponder and an associated RF I D reader,

2a-c several schematic sectional views through the RFID transponder receiving mobile communication terminal along the line l-l,

3 is a plan view of the top of the RFID transponder,

Fig. 4 is a plan view of the underside of the RFID transponder and 5 shows a section through the housing of an energy supply of the mobile communication terminal provided accumulator unit with integrated RFID transponder.

In Fig. 1 is a schematic block diagram of an example of an arrangement consisting of a mobile communication terminal 1, a mobile RFID transponder 2 and a RF I D reader 3, wherein the RF I D reader 3, for example, spatially separated from the mobile communication terminal 1 or mobile RFID transponder 2 is arranged.

The mobile communication terminal 1 may be, for example, a mobile device or mobile telephone, a portable computer, a mobile navigation system or a PDA ("Personal Digital Assistant").

The mobile RFID transponder 2 and the RFI D reader 3 form a non-contact RFID system, via which the transmission of data or information at least from the mobile RFID transponder 2 to the RFI D reader 3 by means of an inductive signal coupling possible is.

For this purpose, the RFI D reader 3 has a control unit 3.1 and an antenna arrangement 3.2, via which an electromagnetic field 4 can be generated. The antenna arrangement 3.2 consists, for example, of a conductor loop which, depending on the operating frequency used, forms a UHF antenna or an HF antenna.

In this case, the RFID transponder 2 is preferably realized as a passive unit, ie it does not have its own power supply and draws the electrical energy required for the operation from the electromagnetic field 4 provided by the RFI D reading device 3. The mobile communication terminal 1 has a preferably made of plastic housing 1.1, which has a mitteis a lid (not shown in the figures) closable recess 1.2 for receiving a preferably replaceable accumulator unit 5. Usually, in this recess 1.2 also a holding device for receiving a SIM card ("Subscriber Identity Module") 6 is provided, which is often below the accumulator unit 5 itself.

In this case, the RFID transponder 2 is arranged in the recess 1.2 provided for receiving the accumulator unit 5, namely, it is clamped, for example, between the accumulator unit 5 and the housing 1.1 by inserting the accumulator unit 5 into the recess 1.2. Also, the RFID transponder 2 can be directly or indirectly connected to the accumulator unit 5 already in the mobile communication terminal 1, the recess 1.2 subsequently being closed by means of the cover and thus the RFID transponder 2 being kept locked in the mobile communication terminal 1. Also, a recess 5.2 for receiving the RFID transponder 2 may be provided in the housing 5.1 of the accumulator 5. Due to the design of the RFID transponder 2 as a replaceable RFID transponder module, use of the RFID transponder 2 in different mobile communication terminals 1 is particularly advantageously possible.

In FIGS. 2 a to c, for example, a section through the mobile communication terminal 1 along line 11 is shown in each case. In this case, the described arrangement possibilities of the mobile RFID transponder 2 within the recess 1.2 are shown by way of example. In addition, in the bottom region of the recess 1.2 also a holding device for receiving and / or attachment of the mobile RFID transponder 2 may be provided (not shown in the figures). In FIG. 3, a top view of the upper side 2 'of a mobile RFID transponder 2 is shown by way of example. In this case, the RFI D-transponder 2 has at least one thin film or substrate layer 2.1, on which an RFID chip 2.2 and at least one antenna structure 2.3 connected thereto are applied. The substrate layer 2.1 serves as a carrier layer on which, for example, an electrically conductive metal foil made of aluminum or copper is applied or laminated. The antenna structure 2.3 is then usually generated by forming the respective antenna structure 2.3 from the metal foil of Alu or copper by means of coating with a photosensitive photoresist and subsequent exposure and treatment in an etching bath. The conductor loops reproducing the antenna structure 2.3 are then connected to the RFID chip 2.2 applied to the substrate layer 2.1. In a preferred embodiment, the upper side 2 'having the RFID chip 2.2 and the antenna structure 2.3 can be protected from environmental influences by means of a further plastic or lacquer layer 2.11'.

On the underside 2 "of the RFID transponder 2, for example of the film or substrate layer 2.1, a shielding layer 2.4 is provided, which is formed by arranging a plurality of highly permeable particles 2.5 in the region of the spatial extent of the antenna structure 2.3 2.5, for example, is aligned parallel with respect to an electromagnetic field 4 that can be induced in the antenna structure 2.3, as a result of which the eddy currents induced by the magnetic alternating flux of the electrically and / or magnetically conductive elements of the accumulator unit 5 located in the electromagnetic field 4 are effectively shielded and thus an unwanted attenuation of the electromagnetic field 4 in the region of the surface of the accumulator unit 5. For this purpose, the mobile RFID transponder 2 is in each case directly or indirectly connected to the accumulator unit 5 via the shielding layer 2.4. The shielding layer 2.4 shown in FIG. 4 has at least two shielding sections 2.4 ', 2.4 ", which are each assigned to a different spatial expansion section 2.3', 2.3" of the antenna structure.

The two shielding sections 2.4 ', 2.4 "can also be realized in each case as a closed, highly permeable layer In a preferred embodiment, free spaces are formed between the highly permeable particles 2.5 and / or between the two shielding sections 2.4', 2.4", which act as air gaps.

Alternatively or additionally, the shielding layer 2.4 or the arrangement of the plurality of highly permeable particles 2.5 can take place on a further substrate layer or film layer 2.1 ', which forms the RFID transponder 2 connected to the substrate layer 2.1.

The further substrate layer or film layer 2.1 'can have a self-adhesive layer on the surface opposite the arrangement of the plurality of highly permeable particles 2.5, by means of which the mobile RFID transponder 2 at least partially adheres within the recess 1.2 to the housing 1.1 or to the surface of the accumulator unit 5 becomes.

FIG. 5 shows by way of example a schematic section through the housing 5.1 of the accumulator unit 5. In the recess 5.1 of the mobile RFID transponder 2 is used, in such a way that the surface of the RFID transponder 2 is arranged approximately flush with the surface of the housing 5.1 of the accumulator unit 5. For protection against mechanical damage, the RFID transponder 2 has a plastic or lacquer layer 2.1 "on the upper side 2 ', on the underside 2" of the RFID transponder 2 or the substrate layer 2.1 the shielding layer 2.4 applied to a further substrate layer or foil layer 2.1 'adjoins, which is directly connected to the housing 5.1 of the accumulator unit 5. Here, the full functionality of the mobile RFID transponder 2 is guaranteed despite the immediate proximity to the conductive components of the accumulator 5 due to the shielding 2.4.

In a preferred, but not shown in the figures embodiment, the mobile communication terminal 1 on an integrated RFI D reader, which is connectable to the control unit of the mobile communication terminal 1. Here, for example, by the mobile communication terminal 1 itself stored in the RFID transponder 2 data or information can be read, by at least periodic activation of the integrated RFI D-reader.

For example, the PIN and / or PUK of a mobile radio subscriber can be stored in the RFID transponder so that it can be automatically read when the mobile communication terminal 1 is switched on. Likewise, further security codes may be stored which are necessary for granting access to the mobile communication terminal 1 or for putting into operation certain communication services. Also passwords required for the use of web services can be automatically read from the RFID transponder 2. In particular, an assignment of a mobile RFID transponder 2 to at least one SIM card 6 is possible.

If the RFID transponder 2 is used to store means of payment in the form of currency units, a payment process can be carried out automatically, for example by means of the RFID transponder 2 integrated in the mobile communication terminal 1, possibly also via a data connection established by the mobile communication terminal 1. The antenna structure 2.3 may, for example, have a spiral shape, a rectangular shape or the like. For example, the antenna structure 2.3 forms the shape of a dipole (UHF antenna) or an induction loop (RF antenna).

The invention has been described above by means of an embodiment. It is understood that numerous modifications and variations of the subject invention are possible without thereby departing from the inventive concept.

LIST OF REFERENCE NUMBERS

1 communication terminal

1.1 housing

1.2 recess

2 RFID transponders

2 'top

2 "bottom

2.1 film or substrate layer

2.1 'further film or substrate layer

2.1 "plastic or lacquer layer

2.2 RFI D chip

2.3 Antenna structure

2.3 ', 2.3 "expansion sections

2.4 shielding layer

2.4 ', 2.4 "shielding sections

2.5 highly permeable particles

3 RF I D reader

3.1 control unit

3.2 antenna arrangement

4 electromagnetic field

5 accumulator unit

5.1 housing

5.2 recess

6 SIM card

Claims

claims

1. Arrangement consisting of a mobile communication terminal (1) and at least one RFID transponder (2), wherein the mobile communication terminal (1) has at least one accumulator unit (5) which in the housing (1.1) of the mobile communication terminal (1) received and wherein the RFID transponder (2) has at least one RFID chip (2.2) and at least one antenna structure (2.3) connected thereto, characterized in that the RFID transponder (2) has at least one film or substrate layer (2.1 ) and on the upper side (2 ') of the RFID chip (2.2) and the antenna structure (2.3) and on its underside (2 ") at least one shielding layer (2.4) are arranged, wherein the at least shielding layer (2.4) by an arrangement a plurality of highly permeable particles (2.5) in the region of the spatial extent of the antenna structure (2.3) is formed and that the RFID transponder (2) via the at least shielding layer (2.4) directly or indirectly t is in communication with the accumulator unit (5).

2. Arrangement according to claim 1, characterized in that the at least one shielding layer (2.4) has at least two mutually insulated shielding sections (2.4 ', 2.4 ").

3. Arrangement according to claim 1 or 2, characterized in that the RFID transponder (2) is received in a recess (1.2) of the housing (1.1) of the mobile communication terminal (1).

4. Arrangement according to one of the preceding claims, characterized in that the RFID transponder (2) in a recess (5.1) of the housing (5.1) of the mobile accumulator unit (5) is accommodated.

5. Arrangement according to one of the preceding claims, characterized in that the antenna structure (2.3) of the RFID transponder (2) is designed as a dipole or as an induction loop. having.

6. Arrangement according to one of the preceding claims, characterized in that the RFID transponder (2) is designed as a passive unit without its own power supply.

7. Arrangement according to one of the preceding claims, characterized in that an RF I D reader (3) with at least one control unit (3.1) and an antenna arrangement (3.2) is provided.

8. Arrangement according to claim 7, characterized in that the RFI D reader (3) in the mobile communication terminal (1) is integrated.

9. Arrangement according to one of the preceding claims, characterized in that the highly permeable particles (2.5) of the shielding layer (2.4) are aligned parallel with respect to a in the antenna structure (2.3) inducible magnetic field.

10.Anordnung according to any one of the preceding claims, characterized in that the RFID transponder (2) is arranged interchangeably in the mobile communication terminal (1).

11.Anordnung according to any one of the preceding claims, characterized in that the mobile communication terminal (1) is a mobile device or mobile phone, a portable computer, a mobile navigation system or a PDA ("Personal Digital Assistant").

12. Arrangement according to one of the preceding claims, characterized in that the shielding layer (2.4) or the arrangement of the plurality of highly permeable particles (2.5) on a further substrate layer or film layer (2.1 ') is provided, which with the film or substrate layer (2.1) connected forms the RFID transponder (2).