EP2798698B1 - Antenne auf einer entfernbaren karte - Google Patents

Antenne auf einer entfernbaren karte Download PDF

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Publication number
EP2798698B1
EP2798698B1 EP12820938.4A EP12820938A EP2798698B1 EP 2798698 B1 EP2798698 B1 EP 2798698B1 EP 12820938 A EP12820938 A EP 12820938A EP 2798698 B1 EP2798698 B1 EP 2798698B1
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EP
European Patent Office
Prior art keywords
winding
kernel
fact
antenna
further characterized
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EP12820938.4A
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English (en)
French (fr)
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EP2798698A1 (de
Inventor
Miroslav Florek
Libor MAJER
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SMK Corp
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SMK Corp
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Publication of EP2798698B1 publication Critical patent/EP2798698B1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
    • H01Q7/08—Ferrite rod or like elongated core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
    • H01Q1/2275—Supports; Mounting means by structural association with other equipment or articles used with computer equipment associated to expansion card or bus, e.g. in PCMCIA, PC cards, Wireless USB

Definitions

  • the invention refers to an antenna and a removable card (above all a memory card) that can be inserted into a slot of a mobile communication device such as a mobile phone, in which, due to its antenna, the removable card acts as hardware for additionally created contactless communication channel i.e. of the NFC (near field communication) type.
  • NFC near field communication
  • the solution is intended mostly for use with payment applications designed primarily for mobile communication devices.
  • the new emission method and the new type of transmitter as these are described in this invention, can be used even with other applications and in other devices, above all in those, in which there is not sufficient space to enlarge the emitting antenna and in which the antenna is shielded by surrounding elements.
  • An antenna located directly on a removable card can be of very limited size.
  • Mobile phones have card slots of the microSD format, a fact that substantially limits the size of the antenna that can be placed directly onto the card.
  • a removable card is inserted into a very shielded slot, e.g. under a mobile phone battery, the card emitting conditions worsen.
  • the usage of rectifying layers, foils has only a narrow, specific influence and it is not universal for purpose of usage in various mobile phone configurations.
  • an antenna on a removable card which is used to establish an additional contactless communication channel from a mobile communication device such as a mobile phone; the removable memory card being intended for insertion into the extending slot of a mobile communication device.
  • the subject matter of the antenna described in this invention is based on the fact that the emitting antenna is created out of a high-frequency transformer with oblong ferrite kernel with resonantly tuned primary winding L1.
  • the signal emitted from the antenna according to this invention is received by a standard receiving device within a given frequency range.
  • the antenna on the side of the mobile phone will be in the form of a high-frequency transformer with a ferrite kernel while on the POS terminal NFC reader side it will be in the form of a common receiving antenna. It is exactly the conformity with existing, standard devices that is important since it is not necessary to replace hardware that is widely used on the side of POS terminals. The change in mobile phone hardware is reached exactly and only by inserting the removable card (primarily of the microSD format) into the existing slot of the mobile phone.
  • the extending slot of the mobile communication device is a slot for the card that does not influence the basic communication function of the device; so, it is mainly, however, not exclusively a slot for a removable memory card of the microSD format.
  • the resonant tuning of the primary winding L1 can be achieved by using capacity elements, e.g. using a capacitor or using two capacitors symmetrically connected into a circuit that connected to the primary winding L1.
  • the resonant tuning can be achieved even by a suitable coiling of the primary winding L1 through which a required capacity of the winding itself is reached.
  • the resonant tuning can be reached even through a connection with the secondary winding L2 on which the capacity is suitably dimensioned in accordance with the L1 and L2 winding transformation ratio or even by using an electromagnetic connection with the surrounding elements.
  • the output of the secondary winding L2 is left without load; it does not have a contact load, which means that on the outputs of the secondary winding L2, no contact ohm circuit is connected and the voltage at the output can reach values up over 100Vpp.
  • the absence of load on the output of the secondary winding L2 is a situation when there is no closed circuit either created or connected via contacts through which the current would flow in the secondary winding L2.
  • the load can exist in the form of impedance emitted into the environment (air + neighboring elements) or in the form of other electromagnetic connections to the surrounding elements.
  • This kind of indirect load can exist in the real environment of the removable card that is inserted into the slot of a mobile communication device; however it will not have a significant influence on electrical voltage on the output of the secondary winding L2.
  • the output or even both outputs from the secondary winding L2 can be connected to other card parts e.g. those for grounding, powering or other parts of the card or through an interface to other parts in the mobile communication device; however, the elements connected in this way do not create a circuit that closes the secondary winding L2 in a contact way.
  • the current, and subsequently even magnetic part of the field can be created in the secondary winding L2.
  • the interconnection of other parts with the output of the secondary winding will engage even other metal parts of the mobile communication device into the emission of the electric field and subsequently even of the magnetic field.
  • the usage of a high frequency transformer that uses the open circuit secondary winding L2 as an emitting element provides us with various possibilities of L1 and L2 winding configuration.
  • L1 and L2 winding ratio we can set different ratio of magnetic and electric parts within the emitted electromagnetic field.
  • the primary winding L1 can have a smaller number of conductor loops than the secondary winding L2.
  • the emitted signal is brought to the primary winding L1, the electric field of the emitted signal is emitted through outputs C-D of the secondary winding L2 and the magnetic field of the emitting signal flows through the ends of the kernel.
  • the secondary winding L2 can be formed even by one coiling i.e. with one incomplete coiling. In this kind of configuration the primary winding L1 does not have smaller number of conductor loops than the secondary winding L2.
  • the coiling of the secondary winding L2 can be in the form of a flat conductor that is bent into the form of a pipe that compasses the isolated coiling of the primary winding L1 with the ferrite kernel. In the transverse plane, the pipe, which is in the in the form of a letter "C", is divided by an oblong dividing gap.
  • the coiling made out of e.g. conductive foil or from a metal plate can cover the entire length of the ferrite kernel and in the same time it shields and directs the flux of the magnetic field.
  • This coiling of the secondary winding L2 can represents a magnetic cannon that directs the field in such a way that this one is emitted from the pipe mouth very strongly.
  • the wave-guiding pipe is in reality created and connected as a coiling of the secondary winding L2.
  • This configuration enables to optimize the course of lines of power of the magnetic field when close to individual conductors of the coiling of the primary winding L1.
  • the pipe can have different ground plans e.g. in the shape of the letters L or M.
  • the secondary winding L2 can be even formed by a spiral coiling of the flat conductor so that this one is in the form of a pipe with several coil loops. The layers that are on top of each other are isolated in between the individual layers.
  • the spiral coiling can have several layers, the connection of the output driver with primary winding L1 goes through the openings in between these layers.
  • the flat material of the conductor used for the coiling should not shield the magnetic field in the first layer so that even subsequent layers (the outer layers) could be in the kernel magnetic field.
  • the material can be non-homogeneous or perforated or it can encompass a structure of conductive paths. Subsequently, several layers on top of each other create even the magnetic cannon effect.
  • the signal emitted from the output driver is brought to the first winding L1 in points A-B.
  • the capacity elements in the first winding L1, e.g. in the form of C2, C2' capacitors; are dimensioned so that they can create the selected resonant frequency e.g. between 13 MHz - 15 MHz, which corresponds to the band of the antenna emitting frequency.
  • a strong electric field that is emitted by the C-D ends of the secondary winding is created on the secondary winding L2 within the mentioned frequency range.
  • the resonant features on the primary winding L1 can be reached by setting the conductor location and size so that the winding itself has a suitable capacity or the entire set of the conductor windings (primary and all secondary ones) has the suitable capacity, possibly even including electromagnetic connections of the surrounding parts.
  • the outputs of the secondary winding L2 can end in dipole having the length between 0 mm and 15 mm, possibly even more depending on spacial possibilities on the card and depending on the required emission effect.
  • the length of dipoles is limited above all by the card size; it is suitable for the dipoles to be away one from another as much as possible.
  • the oblong kernel (mostly in the shape of a rod) emits magnetic field.
  • a very strong electric field is being emitted from the ends of the secondary winding C-D, or possibly from dipoles.
  • the emission of the electric field is improved by dipoles, however in principle the field is emitted even without dipoles - without its conductive outputs.
  • Dipoles can be in the form of stubs or other shapes and other forms.
  • Dipole can be in the form of variously shaped conductive surfaces, e.g. in the form of conductive foil on the card's surface.
  • Various dielectrical materials can be connected to dipoles.
  • the electromagnetic field created in a high-frequency transformer according to this invention can permeate through even small gaps in the mobile communication device spacial structure.
  • the flat gaps e.g. between the card and the card slot or between the battery body and the adjacent mobile phone body are sufficient for the electromagnetic field to emanate out of the mobile phone body.
  • the electromagnetic field emitted from the high-frequency transformer will be received on the second side of the communication channel by a common antenna, e.g. in the form of POS terminal reader.
  • the antenna in the form of a high-frequency transformer that is on the card can have the primary and the secondary winding L1, L2 placed coaxially.
  • the windings can be independent, galvanically separate or the high-frequency transformer can be in the form of an autotransformer with one winding and bifurcations of the primary and secondary circuit L1, L2. In that kind of case, the windings will not be galvanically separate, which however is not a problem; on the contrary, this kind of solution will simplify the production of a transformer.
  • the high-frequency transformer will be basically used to send signal from the removable memory card body.
  • the communication in the opposite direction, when the signal is being received by the removable memory card, does not normally present a problem with the intensity of the electromagnetic field since antennas emitting in this direction are not limited in size. Therefore, in principle it is not necessary to optimize the transmission path in the direction towards the card.
  • the antenna can also have an auxiliary winding L3 with outputs E - F for reception of signal, which can be both in the form of independent winding or in the form of auto-transformer winding bifurcations.
  • the input amplifier and preferably also the C1 capacity element tuned to the frequency of 12 MHz -16 MHz are connected to the E-F outputs of the auxiliary L3 winding.
  • the high-frequency transformer can be supplemented with an independent NFC antenna that is coiled in a standard way; this antenna is used to receive signal in the direction towards the removable card.
  • the winding L1, L2, L3 can also create a shielding cover or it can be connected to a shielding cover electrically.
  • the transformer kernel will be in the shape of a rod of rectangular or round cross-section.
  • the kernel thickness will be of up to 1 mm, the width will be of up to 5 mm and the length of the kernel will be mostly up to 15 mm or more depending on the spatial possibilities on the card.
  • the kernel ferrite should have a relative permeability between 100 and 200. The permeability of the kernel will be set according to the technological possibilities of maximally permitted saturation and size possibilities of the kernels cross section.
  • the term ferrite must be understood as any material that strengthens the features and properties of the magnetic field.
  • the kernel can even be bent, e.g. in the shape of L or U so it would be possible to form the longest distance possible between the kernel ends for the placement of the high-frequency transformer.
  • a direct kernel on the microSD card one with a rectangular cross section would be suitable - thickness up to 0,5mm, width up to 1 mm and length up to 11mm.
  • the loops, coils of the winding can exceed the kernel parameters and they can be shaped into various ground view shapes - e.g. shape L, U and similarly.
  • transformer kernel is oriented within the removable memory card; in principle it can be placed at the edge of the removable card that is opposite to the edge with card interface contact field. That being the case, the length of ferrite kernel will not exceed 11 mm. Dipoles can be lead along the edges of the removable memory card.
  • the maximal effective current from the output driver can be in the range from 0,1 to 0,2 Arms, while the maximal allowed current load is set by the card interface standard.
  • the output driver is part of the final level of power amplifier.
  • the current in the primary coil A-B does not exceed the 0,8 Arms value.
  • the input resistance of a low-noise input amplifier is higher than the minimal load value of the auxiliary winding L3, e.g. more than 10kOhm.
  • the output resistance of the output driver in case of this kind of configuration and powering on the microSD card can be lower than 10 Ohm.
  • the specific value of impedance can be changed depending on the preset voltage, currents and performances ratio.
  • the high-frequency transformer with the structure and features according to this invention does not exist, not even for use in different configurations, it could be advantageous from the production point of view if the high-frequency transformer is made out several independent coils with ferrite kernels on a printed circuit or other substrate.
  • the coils are placed next to each other, kernels touching and the coils are connected in series circuits or parallel circuits or series-parallel combination circuits by its conductor outputs.
  • Contact areas - interconnecting bridges are prepared on the circuit board for this connection. Inputs and outputs A, B, C, D possible even E, F are connected to these contact areas.
  • the row of interconnected coils can be covered by a conductive cover, e.g. metal cover that shields the magnetic field.
  • the row of interconnected coils will be connected to the output driver as one unit but in principle, individual reels or groups of reels can be connected to special output drivers.
  • One antenna set on the removable card as described in this invention can encompass several high frequency transformers according to the above mentioned description. These transformers can be connected with variously oriented kernels, in various combinations, in different axes and with different phases.
  • the antenna on the card according to this invention has excellent transmission features in slots of various mobile communication devices and that even if the slot is located under a battery.
  • FIG. 1 there is a scheme displaying how the antenna is connected to modulation and demodulation elements on the removable card in the configuration, in which the antenna that is in the form of a high-frequency transformer is intended for both emission and reception of a signal.
  • FIG 2 there is a scheme displaying the emitting antenna in the form of a high-frequency transformer and the common antenna for the reception of the signal.
  • FIG 3 there is a scheme showing the configuration of a high-frequency transformer with independent galvanically separate windings.
  • the upper part of the figure 4 displays the cross-section of the high-frequency transformer construction with independent galvanically separate windings.
  • the lower part of the figure displays how the contacts are placed on the antenna flat surface.
  • Figure 5 contains examples of four frequency settings of the antenna in the NFC emitting band.
  • the resonance curve is displayed in full line.
  • the peak of the resonance curve is the resonance frequency f R of the antenna and it can be identical to the emitting f1 frequency or to the f2 receiving frequency or it can only form the peak of the curve that features the used bands of frequencies.
  • the f1 emitting frequency is shown in broken line.
  • the receiving frequency f2 is shown in dash dot line.
  • the y axis represents the input current into the antenna.
  • the figure 6 is an axonometric view on an example of how the high-frequency auto-transformer with one winding and with symmetrically created bifurcations is constructed.
  • the figure 7 displays the example of how the antenna with dipoles is placed on the removable microSD memory card.
  • Figure 8 shows an example of a different placement of the antenna with dipoles on the edges of the removable microSD memory card.
  • Figure 9 displays a high-frequency transformer based on a PCB (printed circuit board) board made from six independent windings that are connected in series and that have kernels that are in contact with one another.
  • PCB printed circuit board
  • Figure 11 displays dipoles in the form of conductive areas on the opposite outer surfaces of the microSD card, where the conductive areas have edges in a zigzag shape that is adjusted for better emission of the electric field.
  • the removable memory card 1 is in the microSD format and within its body it contains an antenna in the form of a high-frequency transformer 2.
  • the transformer 2 has three windings L1, L2, L3 that are physically created by one coil on the kernel 3 made of ferrite. The windings are created by symmetrically going bifurcations of the first, secondary and auxiliary circuit L1, L2, L3. So, the transformer 2 is in the form of an auto-transformer.
  • the kernel 3 is in the shape of a rod with rectangular cross-section; in this example it is 0,5 mm thick, 1 mm wide and 5 mm long.
  • the windings L1, L2, L3 are not galvanically separate in this example.
  • the emitted signal from the output driver 6 is brought to points A-B on the primary winding L1, to which the capacity elements C2, C2' that are tuned to the resonance frequency of 13,56 MHz are symmetrically connected.
  • the electrical field is emitted from the C-D ends of the secondary winding L2, which in these examples is ended by two direct conductors that are 5 mm long. This ending creates a dipole 4 which strengthens the emission of the electrical field and which can also influence the magnetic field.
  • the winding in this example is formed by a conductor 5 with a rectangular cross-section of 70 um x 30 um and the gaps between the windings are approx. 30 um.
  • the auxiliary winding E-F is set to receive the signal emitted in direction towards the removable card 1 .
  • the capacity element C1 and the input amplifier 7 are connected to the outputs E-F.
  • the center of the L3 winding is grounded.
  • the removable card 1 with an antenna according to this example is intended for insertion into a mobile phone. Thanks to this card an additional NFC channel is created in the mobile phone.
  • the slot for the microSD card is under the battery. Between the metal elements of the phone and the battery there are gaps through which the electromagnetic fields flow basically in all possible directions.
  • the antenna according to this example has excellent transmission features in slots of different mobile communication devices even if the slot is located under the battery.
  • the maximal value of the magnetic field in the ferrite kernel 3 is under 100A/m.
  • a high-frequency auto-transformer 2 that is complemented with a receiving antenna 8 for the reception of a signal.
  • This antenna is in the form of a common flat NFC antenna that substitutes the function of the auxiliary winding L3 described in example 1.
  • the high-transformer 2 is made out of the six independent coils 9 with a ferrite kernel 3, which are connected to a printed circuit.
  • the coils 9 are placed practically as close to each other as possible so their kernels 3 would touch. This creates a compact kernel 3 ; existing air gaps between the kernels 3 do not have any significant influence on the flux of the magnetic field.
  • the field of six coils 9 is covered by a conductive, shielding cover that improves the emission of the electromagnetic field. This cover is technologically helpful during assembly and it increases mechanical stability of the configuration. The shielding cover is not shown on the figure 9 .
  • the dipoles 4 are created by a conductive paint on the edges of the removable microSD card 1 .
  • the high-frequency transformer 2 is in the form of a transformer with three independent windings L1, L2, L3.
  • the secondary winding L2 is coiled first round the ferrite kernel 3 of rectangular cross section with relative permeability 125. This secondary winding L2 runs symmetrically to both ends of the kernel 3 .
  • the isolation layer is applied to the kernel 3 with the secondary winding L2, the L1 primary winding and the auxiliary winding L3 are applied.
  • the operation frequency of the antenna is 14,4 MHz.
  • the windings have flat contacts brought out to the wider area of the outer surface of the antenna for the purpose of SMD assembly.
  • the primary winding L1 with contacts A-B has 8 loops of the conductor 5 and induction of approx.
  • the secondary winding L2 with outputs C-D has 46 loops of the conductor 5 and induction of approx. 7 ⁇ H +-10%.
  • the auxiliary winding L3 with outputs E-F has 3 loops of the conductor 5 and induction of approx. 72 nH +-10%.
  • the conductors 5 have 50um in diameter and windings are 30 um apart.
  • the dipoles 4 are created as conductive facettes made out of foil. These facettes are located on the opposite surfaces of the removable memory card 1 .
  • the foil edge is of zigzag shape - made out of sharp triangles. On the surface, on which there is contact interface on the removable memory card 1 the foil is located next to the edge opposite to the contacts. On the opposite surface of the removable memory card 1 the foil is located directly opposite the contacts. On the figure 11 , this foil that is opposite the contacts on the other surface is shown in broken lines.
  • a secondary winding L2 created by only one loop, one coil, which has the width of the conductor 5 that exceeds the length of the kernel 3 .
  • the coil is formed by rounding the thin conductive metal sheet, so that the "C" profile would not be closed conductively.
  • a kernel 3 with a primary winding L1.
  • the secondary winding L2 also forms a shielding cover that directs the flux of the magnetic field which then comes out of the secondary winding L2 pipe ends.
  • the secondary winding L2 can have several coils of flat conductor 5 formed into a spiral while the individual layers are isolated one from another.
  • transformers 2 can be connected with differently oriented kernels 3 in various combinations, in various axes and they can also be mutually phased.

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Claims (15)

  1. Die Antenne an der entnahmefähigen Karte (1) zur Herstellung eines nachträglichen kontaktlosen Kommunikationskanals eines mobilen Kommunikationsgeräts, besonders des Mobiltelefons, wo die entnahmefähige Karte (1) besonders als entnahmefähige Speicherkarte (1) zum Einschieben im erweiternden Slot vom mobilen Kommunikationsgerät bestimmt ist, und wo das von der Antenne ausgestrahltes Signal vom standardmäßigen Empfangsgerät empfangen wird, gekennzeichnet dadurch, dass
    die Antenne von einem Hochfrequenztransformator (2) mit länglichem Ferritkern (3), mit Primärwicklung L1 mit Eingängen A - B und Sekundärwicklung L2 mit Ausgängen C , D gebildet wird,
    der längliche Ferritkern (3) gleichlaufend mit der Oberfläche der entnahmefähigen Karte (1) platziert ist,
    die Primärwicklung L1 resonanzmäßig im Rahmen des Frequenzbandes der Antenne eingestellt ist,
    die Primärwicklung L1 kleinere oder gleiche Leiterschleifenanzahl wie die Sekundärwicklung L2 besitzt,
    die Ausgänge C - D der Sekundärwicklung L2 ohne Kontakt geschlossenen elektrischen Kreis der Last leergeschaltet sind,
    wobei das Sendesignal aus dem Ausgangstreiber (6) an die Eingänge A - B der Primärwicklung L1 zugeführt wird,
    das elektrische Feld vom gesendeten Signal namentlich über die Ausgänge C - D der sekundären Wicklung L2 ausgestrahlt wird und das Magnetfeld des ausgestrahlten Signals vor allem über Enden des Kerns (3) fließt.
  2. Die Antenne nach Anspruch 1 weiterhin gekennzeichnet dadurch, dass sie wenigstens zwei Hochfrequenztransformatoren (2) mit Ferritkernen (3) besitzt, wobei die Achsen von Kernen (3) verschieden orientiert sind, vorteilhaft sind die Hochfrequenztransformatoren (2) verschieden synchronisiert.
  3. Die Antenne nach beliebigem Anspruch 1 bis 2 weiter gekennzeichnet dadurch, dass die Primärwicklung L1 resonanzmäßig abgestimmt ist, vorteilhaft im Bereich 13 MHz bis 15 MHz, vermittelst wenigstens eines Kapazitätselements C2, C2' angeschlossenen an die Primärwicklung L1 und/oder vermittelst einer entsprechenden Kapazität des eigentlichen Wicklung der Leiter (5) der Primärwicklung L1 und/oder vermittelst der Kapazitäten der Leiter (5) aller Wicklungen L1, L2 und/oder vermittelst elektromagnetischer Kopplungen an die Umgebung.
  4. Die Antenne nach beliebigem Anspruch 1 bis 3 weiter gekennzeichnet dadurch, dass die Sekundärwicklung L2 durch eine Wicklung des flachen Leiters (5) in ein kleines Rohr mit Profil der C-Form gebildet wird, die Profilarme C sind nicht leitend angeschlossen, die Primärwicklung L1 mit dem Kern (3) liegen im kleinen Rohr und die Rohrlänge entspricht der Kernlänge oder greift über die Länge des Kerns (3).
  5. Die Antenne nach beliebigem Anspruch 1 bis 3 weiter gekennzeichnet dadurch, dass die Sekundärwicklung L2 durch eine Wicklung des flachen Leiters (5) in ein spiralförmiges Rohr gebildet wird, die aneinander liegenden Schichten des flachen Leiters (5) sind isoliert, die Primärwicklung L1 mit dem Kern (3) befindet sich im kleinen Rohr und die Rohrlänge entspricht der Länge des Kerns oder greift über die Länge des Kerns (3).
  6. Die Antenne nach beliebigem Anspruch 1 bis 5 weiter gekennzeichnet dadurch, dass die Ausgänge C - D der Sekundärwicklung L2 mit dem Dipol (4) beendet werden, der vorteilhaft an den Kanten der entnahmefähigen Speicherkarte (1) platziert ist.
  7. Die Antenne nach beliebigem Anspruch 1 bis 5 weiter gekennzeichnet dadurch, dass die Ausgänge C - D der Sekundärwicklung L2 mit dem Dipol (4) beendet werden, wobei der Dipol (4) durch eine kleine leitende an der äußeren Fläche der entnahmefähigen Karte (1) liegende Fläche gebildet wird, diese hat vorteilhaft scharf beendete Ränder zur Ausstrahlung des elektrischen Feldes.
  8. Die Antenne nach beliebigem Anspruch 1 bis 7 weiter gekennzeichnet dadurch, dass einer oder die beiden Ausgänge des Sekundärwicklung L2 mit der Erdung und/oder Einspeisung und/oder mit der Schnittstelle der entnahmefähigen Karte (1) und/oder mit einem anderen Element an der entnahmefähigen Karte (1) verbunden sind.
  9. Die Antenne nach beliebigem Anspruch 1 bis 8 weiter gekennzeichnet dadurch, dass die Primär- und Sekundärwicklung L1 und L2 des Hochfrequenztransformators (2) achsgleich auf dem Kern (3) platziert sind und die Wicklungen L1 und L2 selbständig, galvanisch getrennt sind.
  10. Die Antenne nach beliebigem Anspruch 1 bis 3 und 6 bis 9 weiter gekennzeichnet dadurch, dass der Hochfrequenztransformator (2) der Autotransformator mit einer Wicklung und Abzapfungen vom Primär- und Sekundärkreis L1 und L2 ist.
  11. Die Antenne nach beliebigem Anspruch 1 bis 10 weiter gekennzeichnet dadurch, dass der Hochfrequenztransformator (2) eine Hilfswicklung L3 zum Signalempfang in Richtung zur entnahmefähigen Karte (1) besitzt, die Hilfswicklung L3 ist mit dem Eingangsverstärker (7) verbunden, vorteilhaft ist zur Hilfswicklung L3 das Kapazitätselement C1 angeschlossen und vorteilhaft ist die Mitte der Hilfswicklung L3 geerdet.
  12. Die Antenne nach beliebigem Anspruch 1 bis 11 weiter gekennzeichnet dadurch, dass der Kern (3) die Form eines länglichen Stäbchen mit dem rechtwinkligen oder Rundquerschnitt mit der Dicke bis 1 mm und Breite bis 5 mm und Länge bis 15 mm besitzt, vorteilhaft hat der Kern (3) den Rechteckquerschnitt mit der Dicke bis 0,5 mm, mit Breite bis 1 mm und Länge bis 11 mm.
  13. Die Antenne nach beliebigem Anspruch 1 bis 12 weiter gekennzeichnet dadurch, dass der Hochfrequenztransformator (2) aus mehreren selbständigen Spulen (9) mit Ferritkernen (3) zusammengesetzt ist, die Spulen (9) sind nebeneinander mit Berührung der Kerne (3) aufgelegt und die Spulen (9) sind mit Ausgängen der Leiter seriell und/oder parallel und/oder serien-parallel geschaltet.
  14. Die Antenne nach beliebigem Anspruch 1 bis 13 weiter gekennzeichnet dadurch, dass der Hochfrequenztransformator (2) in einem Abschirmgehäuse mit Öffnungen zur Ausstrahlung des Magnetfeldes platziert ist, von Vorteil ist, wenn eine von den Wicklungen L1, L2, L3 am Abschirmgehäuse angeschlossen ist.
  15. Die Antenne nach beliebigem Anspruch 1 bis 14 weiter gekennzeichnet dadurch, dass eine von den Wicklungen L1, L2, L3 das Abschirmgehäuse bildet, worin sich der Kern (3) mit sonstigen Wicklungen befinden.
EP12820938.4A 2011-12-28 2012-12-27 Antenne auf einer entfernbaren karte Not-in-force EP2798698B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SK50058-2011A SK288756B6 (sk) 2011-12-28 2011-12-28 Anténa na vyberateľnej karte
PCT/IB2012/057766 WO2013098784A1 (en) 2011-12-28 2012-12-27 An antenna on a removable card

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EP2798698A1 EP2798698A1 (de) 2014-11-05
EP2798698B1 true EP2798698B1 (de) 2018-11-21

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Publication number Priority date Publication date Assignee Title
EP3010084B1 (de) * 2014-10-17 2019-09-04 Synoste OY Vorrichtung mit einer Empfangsantenne und zugehöriges Leistungsübertragungssystem
SK289113B6 (sk) 2016-09-19 2023-09-13 Logomotion, S.R.O Anténa sjadrom, najmä miniatúrna RFID a/alebo NFC anténa, a spôsob jej výroby

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Publication number Priority date Publication date Assignee Title
US4407000A (en) * 1981-06-25 1983-09-27 Tdk Electronics Co., Ltd. Combined dipole and ferrite antenna
DE10156073B4 (de) 2001-11-16 2008-08-21 Giesecke & Devrient Gmbh Folienbatterie für tragbare Datenträger mit Antennenfunktion
DE10252348A1 (de) 2002-11-11 2004-05-19 Giesecke & Devrient Gmbh Tragbarer Datenträger
US7317426B2 (en) * 2005-02-04 2008-01-08 Sensormatic Electronics Corporation Core antenna for EAS and RFID applications
US8025237B2 (en) * 2006-01-20 2011-09-27 Panasonic Corporation Antenna built-in module, card type information device, and methods for manufacturing them
JP5582654B2 (ja) * 2008-08-29 2014-09-03 ロゴモーション エス．アール．オー． 非接触通信用の脱着可能なカード、その使用および作製方法
GB0901583D0 (en) * 2009-01-30 2009-03-11 Cambridge Silicon Radio Ltd Internal FM antenna
CN201590480U (zh) 2009-12-30 2010-09-22 中兴通讯股份有限公司 手持终端及供电电池

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SK288756B6 (sk) 2020-05-04
EP2798698A1 (de) 2014-11-05
WO2013098784A1 (en) 2013-07-04
WO2013098784A4 (en) 2013-11-07
SK500582011A3 (sk) 2013-07-02

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