Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
  • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
  • H04B1/40—Circuits
• • 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
  • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
• • 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
• • 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
• • 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
  • H01Q1/2283—Supports; Mounting means by structural association with other equipment or articles mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package

Definitions

• the invention relates to a method for minimizing a disturbance current induced in an electromagnetic field receiving antenna by a transmitting antenna in the vicinity, an antenna arrangement and a device implementing the method.
• Radiofrequency communication is in principle short-range and performed by coupling and electromagnetic induction range of the order of 0.01 or 1 m.
• memory cards such as SD (from Sandisk company), communicating watches.
• Such cards are currently used in a mobile phone card interface to perform a contactless transaction type in particular meeting the ISO / IEC 14443 or 15693 standard, insofar as these phones do not have contactless interfaces when shipped from the factory.
• the current technology ISO / IEC 14443 and NFC is based on a principle of retro modulation of a signal emitted by a reader.
• a certain amount of electromagnetic field supplied by a reader must be modulated by the proximity contactless chip object also called PICC (acronym for Proximity Integrated Circuit Card).
• PICC proximity contactless chip object
• a minimum field amplitude is required to be modulated by the object.
• This modulation of the reader carrier must generate two sidebands with an amplitude at least equal to H / 2 0 '5.
• the coupling factor is directly dependent on the surfaces of the reader antenna and that of the non-contact object.
• EP1801741 (B1) discloses a method for generating a clean electromagnetic field by a portable data carrier (transponder), in which the transmission of data to a reader is effected in an activated communication mode and in which the transmission The electromagnetic field of the object is seen by the reader as a modulation of the reader's field.
• the patent application US2010 / 0311328 discloses a contactless card comprising a data transmitting antenna, an energy receiving antenna and a cancellation device.
• the latter performs a cancellation of a current induced in the transmitting antenna by the transmitting antenna so as to maintain, almost without distortion, a signal received by the receiving antenna and coming from an external reader.
• the receiving and transmitting antennas are shaped, sized, and positioned relative to one another so that a signal transmitted by one antenna is prevented from inducing voltage in the other antenna. The signal suppression takes place when the energy and data signals have the same amplitudes but are in phase opposition.
• the object of the invention is to find an easier and more advantageous solution for implementing an emission in objects of particular reduced size in which two distinct antennas can have mutually disturbing inductions.
• the subject of the invention is therefore a method for minimizing a disturbing current induced in an electromagnetic field receiving antenna, said field being generated by a transmitting antenna located near said receiving antenna;
• the method is distinguished in that the receiving antenna is arranged with respect to the transmitting antenna so that said current induced by the transmitting antenna is canceled at least partly in the receiving antenna by an opposite induced current also generated by the transmitting antenna.
• Said antennas are arranged between them being partially facing each other on two substantially parallel horizontal planes;
• the antennas overlap, with about half of the coupling surface of the receiving antenna substantially covering the coupling surface of the transmitting antenna;
• the receiving antenna overlaps the transmitting antenna so that the current induced in the receiving antenna generated by a flux produced inside the transmitting antenna is substantially equal to the opposite current induced in the receiving antenna generated by a flux. of opposite direction produced outside the transmitting antenna and received by a receiving antenna portion located outside the transmitting antenna;
• the invention also relates to an arrangement of emitter and receiver electromagnetic field antennas, said antennas being disposed close to each other;
• the arrangement is distinguished in that the receiving antenna is arranged with respect to the transmitting antenna so that that said current induced by the transmitting antenna substantially cancels out at least substantially or substantially in the receiving antenna by an opposite induced current also generated by the transmitting antenna.
• the invention can cancel the induction partly for example greater than 60%, 80% or 90%.
• the antennas are arranged so that the electromagnetic flux of the transmitting antenna passes through a first coupling surface portion of the transmitting antenna in one direction and an opposite flow passes through a second portion of the coupling surface of the receiving antenna in an opposite sense;
• the antennas are arranged on the same face of a support or on opposite faces; one of the antennas overlaps the other on half of its coupling surface.
• the invention also relates to a radio frequency communication device implementing the above method or comprising the antenna arrangement above.
• the device comprising means for receiving and transmitting an electromagnetic field conveying transmission data being synchronized with said reception;
• the device is distinguished by a first data receiving antenna and a second data transmitting antenna are arranged in accordance with the above arrangement.
• the device may be integrated in or constitute an object having a form factor of an integrated circuit card or micro SD card or a watch.
• the invention a good coupling is achieved between, in particular, a reader and an object of the PICC type (SD card); In addition, it is easy to implement with minimal modification;
• the invention applies in particular to any usual dual interface chip (with or without oscillator).
• FIG. 1 illustrates an SD type card comprising the circuit according to one embodiment of the invention
• Figure 2 illustrates a more detailed view of the RF radio frequency circuit of the previous figure
• FIG. 3A illustrates a first embodiment of a reception stage of FIG. 2
• FIG. 3B illustrates a second embodiment of a reception stage of FIG. 2
• FIG. 4 illustrates an embodiment of the transmission stage of the FIG.
• FIG. 5 and 6 illustrate a receiving antenna arranged with respect to a micro SD card and equivalent circuit values of the antenna
• FIG. 7 illustrates the level of modulation by the radiofrequency component SE (5);
• FIG. 8 illustrates a filter for extracting the response signal of the component 5 from the carrier of the preceding figure
• FIG. 9 illustrates a combination circuit of the carrier and the response signal alone
• Figure 10 illustrates an LC circuit relating to the transmitting antenna
• FIG. 11 illustrates the values of the reactances X L and X c respectively from the inductance and the capacitance as a function of the frequency
• FIG. 12 illustrates an arrangement of a transmitting antenna with respect to a micro SD card and an arrangement of the two antennas with each other.
• Activated communication means contactless communication in which the response of a transponder is effected by emitting an electromagnetic field specific to the transponder, preferably amplified. This emission is in fact obtained by the transmission at a given power of a carrier signal modulated by a transponder signal.
• the power of amplification and / or operation of the transceiver transceiver is preferably provided by an external power source distinct from the reader.
• the communication or the contactless circuit is in accordance with ISO / IEC 14443 and / or ISO / IEC 15693 or any other protocol based on an excitation frequency of the electromagnetic field at 13.56 MHz.
• the circuit is powered by a power source.
• Figure 1 is shown schematically an embodiment of a contactless communication circuit 1 according to the invention equipping a memory card 1A.
• any other communicating object can be equipped with it, for example, USB key, PCMCIA card ... phone, PDA, computer.
• the object may or may not be removable relative to a host device or be fixed permanently including soldered on a printed circuit board.
• the circuit or object may optionally provide external antenna connections rather than support them.
• the memory card 1 comprises, in a known manner, contact pads 2, a microcontroller 3, a mass memory 4 (NAND) connected to the microcontroller.
• the card further comprises a communication processing element 5; It is preferably of the dual interface type (configured to handle a contact type communication, for example ISO 7816-3 and non-contact ISO-14443 (SE)); This component or element 5 (SE) is preferably secure as an integrated circuit chip known from the field of the smart card; It may be provided, if necessary cryptographic and / or anti-fraud, anti-extrusion, etc..
• the component SE is connected to the microcontroller 3 by an input / output port;
• the security component SE is connected to an active CL interface circuit 6; This component 6 receives two antennas 7, 8, respectively receiving and transmitting.
• the invention comprises additional RF means 6, 7, 8 added to the non-contact element SE to compensate for the particularly small size of the antenna since housed in a micro SD card (11x15 mm) or mini SD or in a obj and substantially equivalent size.
• the transmission means 5, 6, 7, 8 are configured to modulate a carrier signal 25.
• This carrier signal is here preferably derived or extracted from the magnetic field received from an external reader.
• the radio frequency circuit 6 performs functional activities for receiving and transmitting the electromagnetic field below; It notably captures the external RF radio frequency field from a contactless reader to, if necessary, make it compatible with the secure component SE (voltage, etc.); It amplifies the response of the secure element SE intended to be listened to by the external reader.
• Figure 2 further describes the SE component (5) and its links.
• the circuit SE of this mode comprises means of connection to an external source of energy.
• the component SE comprises a contact interface, for example according to the ISO-7816 standard symbolized by a bundle of connections 9; it comprises a supply pad Vcc, and pads La, Lb respectively connected to an active interface 6 and ground.
• the component SE is configured to modulate an impedance load in response to a reception of the contactless frames received on its pads La, Lb.
• the active interface 6 comprises a circuit 16 for conditioning the reception signal SRE and a circuit 17 generating pulses for transmitting a transmission signal SEE.
• Each circuit 16, 17 is connected to the pad (La) of the treatment component 5.
• the transmission means 5, 17 are configured to modulate a carrier signal.
• the carrier signal preferably results from a derivation or extraction of the received magnetic field SRE.
• the method comprises a step of receiving the carrier frequency generated by the reader;
• the carrier frequency is received by a dedicated receiving antenna 7.
• the antenna 7 actually receives the electromagnetic field emitted by the reader comprising the modulated carrier frequency.
• the frequency is in the example of 13.56 MHz but it could be any other depending on the type of communication or protocol based on this frequency of 13.56 MHz short or medium lower range including 10 m, 1 m or 0.1 m or even close to 0.
• the invention does not exclude generating a carrier signal otherwise for example from a clock signal or internal signal of a host device or object.
• This reception step also aims to collect the data sent by the reader to the contactless object.
• An electronic stage comprising a dedicated reception circuit can be developed for this purpose in particular to adapt the voltage.
• the method may also implement a step of matching through a receive matching stage (16) to adapt the SRE receive signal to the chip 5;
• the method may cumulatively or alternatively perform in this stage an extraction of a synchronized carrier signal from the receive signal SRE.
• FIG. 3A is illustrated a first detailed embodiment 16B of the stage 16.
• the reception stage 16A comprises the reception antenna 7 here connected to the 'La' pad of the chip via a reception circuit described below. after.
• the signal received by this antenna can be amplified before extraction of the clock signal corresponding to the signal of the carrier;
• the circuit includes a amplifier 30 connected to the antenna and the output of this amplifier is connected a clock extractor 31;
• the clock signal obtained at the output of the extractor is sent via a link (K) to a source generator circuit or emission matching stage 17 detailed in FIG. 4.
• the output of the extractor of FIG. clock 31 is also connected to a logic circuit 35 performing an "AND" function.
• the stage 16A here also comprises a demodulator 32a receiving the reception signal SRE amplified by the amplifier 30 connected to a comparison circuit 33a for comparing the demodulated signal obtained with a reference voltage (TR).
• a demodulator 32a receiving the reception signal SRE amplified by the amplifier 30 connected to a comparison circuit 33a for comparing the demodulated signal obtained with a reference voltage (TR).
• the output signal of the comparator 33a is combined with the clock signal 25 from the clock extractor 31 at a component 35 performing a ⁇ AND logic function; A first branch of the output of the component 35 can pass through an amplifier 36 before being injected into the pad 'La' of the chip 5.
• a second branch of the output of the component 35 can pass through an inverter and then an amplifier 36 before being connected to the pad A Lb 'of the chip.
• FIG. 3B is illustrated a second embodiment 16B of this stage 16 and in which the component 5 used is still a chip with dual interface contact and contactless (combi).
• the same numbers from one figure to another represent identical or substantially similar elements.
• the clock extraction circuit 31 also connects to a phase shifter 34 before acting on the analog / digital converter 32b.
• the stage or reception circuit 16B is firstly connected to the receiving antenna 7 connected here to the pad 'La' of the chip.
• the circuit 16B may comprise a capacitor 13 disposed across the pads' La 'and A Lb' of the chip. This ability makes it possible to have a good quality factor.
• the resonant circuit of the receiving antenna is realized on the principle of a parallel circuit.
• the demodulator 32a is replaced by an analog / digital converter 32b
• the comparator 33a is replaced by a digital comparator 33b with a reference digital value (DR)
• the pad A Lb ' is connected to the mass instead of receiving the "AND" circuit output signal inverted and amplified respectively by an inverter 37 and an amplifier 36.
• this circuit comprises a phase shifter 34 on an output branch of the clock extractor 31. This phase shifter then connects to the analog / digital converter 32b.
• stages 16A or 16B each make it possible to extract the clock signal 25 and to adapt the signal to the chip 5.
• the carrier signal is directed to the RF input of the Combi chip 5. using the La / Lb interface pads
• An additional capacitor 18 may be added to the interface to adapt the input impedance.
• the electronic stages 16A and 16B operate as follows:
• the signal SRE received by the antenna 7 may be quite small given the small coupling surface of the antenna 7 in a support such as a mini SD card.
• This signal is amplified by the amplifier 30 before being demodulated by the demodulator 32a or analog / digital converter 32b;
• a useful signal extracted and calibrated by the comparator is combined by the (AND) gate 35 with the clock signal extracted by the clock extractor 31.
• the refurbished radiofrequency signal is injected into the component 5 being previously amplified in differential mode by the inverter 37 and the amplifiers 36.
• the power supply Vcc of the ISO 7816 contact-side chip can be deactivated by a suitable circuit (not shown) during the presence of an electromagnetic field SRE.
• This last circuit can be included in the circuit 16A or 16B. Actuation can be manual.
• the latter may preferably have their components (30, 36, 32a %) supplied with voltage by a power supply coming from the contacts 2 in connection with a host device.
• Circuit 16B operates substantially the same; However, the phase-shifter 34 makes it possible to regulate accurately the triggering of the acquisition of the radiofrequency signal. to convert the envelope of the received signal into a digital signal by the converter 32b.
• the "Combi" chip 5 can be either powered by its contact pads ISO / IEC 7816 Vdd and Vss, or use the energy provided by the field on its interface pads La, Lb according to the use and electronic assembly of the invention.
• the chip may also be powered by a voltage that would be generated in the image of the RF field or by the circuit 16 itself which would be powered by the contacts 2 of a host device.
• the advantage of the latter option is for the component 5 to see its power managed by the stage 16 depending on the presence or absence of the field and if necessary to reset the chip 5.
• the voltage amplitude VLab is at least 3.3 Vpp (peak-peak volts). This value is necessary for the example chip to detect the 13.56 MHz clock and extract data from the reader.
• the following table shows the voltage required by two current chips Philips P5CD072 Philips / NXP or Infineon 66CLX800 to detect the clock and data from outside field.
• Vcc 3v 2, 7v Vmin (Vpp) 3.48 3.53
• the size of the receiving antenna 7 is as wide as possible within the limit of the available surface area in the object. In the context of a surface available on a micro SD card, the results below have been retained.
• the inductor is preferably selected to be tuned by a small additional capacitor to limit the size of the capacitor.
• the receiving antenna may for example have a surface 5 x 5 mm 2 and comprise 4 to 6 turns.
• the antenna can be set to 13.56 MHz with a quality factor Q of 10.
• a parallel circuit can be selected to obtain a maximum voltage across the antenna circuit. The following antenna characteristics were selected with the equivalent circuit of Figure 6 with L: 663 nH and R: 1.59 ⁇ ; C not applicable.
• the expected voltage with this antenna is greater than lVpp (peak-to-peak volt).
• the minimum field creates a voltage greater than 1Vpp, not enough for the combi chip 5 to detect the signal. Therefore, in the exemplary embodiment with a micro SD card, an amplification stage is preferably introduced. This amplification stage for the reception of the clock is here greater than 10 dB, the voltage gain being equal to 3. This amplification may not be necessary in other circumstances or other chips.
• the output level of the conditioning stage 16 is between 3 Vpp and 14 Vpp.
• the gain can be between 5 and 20dB.
• the power failure of the chip or the RESET function can also be triggered by any means, such as a switch in the host device or on the power supply circuit of the chip.
• the chip automatically resets when it is turned on. Lateral band and modulation (Fig. 7-10).
• the combi chip 5 when the combi chip 5 receives the carrier signal (or the carrier) as well as the data signal, through its La / Lb pads, it generates a charge modulation signal so that to transmit a response to the device or terminal in communication relation with it.
• the amplitude of the modulation signal Vmod is here about half of the amplitude of the carrier VLAB when the capacitor is well adapted.
• a capacitor from 10 to 60pF across the points La, Lb of the chip can be used for this purpose. This value may vary depending on the type of chip.
• the voltages VLAB and Vmod equal to 3.3 volts peak-peak and 1.6 volts peak-peak are obtained.
• the simplest is to use this signal as it stands and then, preferably, to amplify it in a high power amplification stage before injecting the signal into an adaptation circuit or activation circuit. the transmission 17 before the transmitting antenna 8.
• Various amplification means known to those skilled in the art can be used.
• the carrier signal for the transmission is suppressed in order to preserve the digital data 25.
• a low-pass filter 27 of FIG. 8 it is possible to use for example a low-pass filter 27 of FIG. 8.
• a 100% modulation is preferably effected by combining the data signal with a carrier 26 at 13.56 MHz. This can be achieved by using the logic (AND) gate 38 or an amplifier buffer 42 or a transistor arrangement performing the same function. After power amplification, the obtained signal 29 is used to power the output antenna 8.
• the invention provides for amplifying the signal and the carrier only when there is no signal. there is an answer signal.
• the useful signal 29 is amplified when the data signal is at a high level. When there is no signal, (line of data at a level zero or close to zero), no signal leaves door 38. There is no amplification and loss of unnecessary energy of the carrier alone before powering the transmitting antenna.
• Figure 4 illustrates a relatively simple preferred embodiment for achieving good results and partly implementing the second option;
• the matching stage 17 comprises an "AND" logic gate 38 or equivalent circuit for combining a carrier signal 26 (FIG. 9) and a response or transmission signal of the front chip. amplification.
• the stud l 'of the chip 5 is connected to a demodulator 39 (which can be of the same type as the circuit 27 or 32a) for receiving a modulated response signal of the chip 5; Then, the output of the demodulator 39 connects a comparator 41 which compares the received voltage level to a reference voltage level (TRE) in order to digitize the wanted signal.
• the output of the comparator 41 carrying the useful response signal of the chip 26 is connected to one of the inputs of the component 38 performing the logic function ⁇ ⁇ 'to combine the carrier signal 25 with the response signal 26 of the chip .
• the carrier 25 originates from the point K of the reception and extraction matching stage 16A or 16B;
• the carrier is injected via a link to the other input pad of the component 38 performing the logic function ⁇ ⁇ ';
• the clock signal is preferably phase shifted by a phase shifter 40 so as to optimally synchronize or block the clock signals with the carrier of the radiofrequency signal generated by a reader device to produce maximum backmodulation.
• the circuit 17 preferably comprises a buffer circuit or amplifier 42 for amplifying the signal 29 at the output of the component 38 before injecting it into the transmitting antenna 8.
• the antenna circuit used forms with a capacitor 43 a resonant circuit series.
• the circuit 17 may preferably be supplied with voltage, for their operation, by a source of energy from the host device via the contacts 2. Other sources known to those skilled in the art are not known. excluded.
• the circuit 17 operates as below. After the chip has received on its points L1, Lb radiofrequency frames SRE preferably reconditioned beforehand, the response of the chip by charge modulation is received and demodulated in the demodulator 39; Then a useful signal is digitized by the threshold comparator 41 before being injected into the (AND) circuit 38 and combined with a carrier 25 extracted or derived from the received field SRE from the point K. Where appropriate, the circuit 17 may include a clock extractor similar to 31 picking up the signal as in Figures 16A or 16B.
• the response signal 29 resulting from the circuit 38 is then amplified preferably by the amplifier 42 before being injected into the series 8 resonance transmitting antenna.
• an output buffer amplifier 42 which preferably delivers a minimum current of 60 to 80 mA under the supply voltage can be used. made. Good results are obtained with a power greater than 200 mW.
• An advantage of this treatment is in particular to limit the power consumption at the amplification level when there is no response signal of the chip 5. It is indeed unnecessary to amplify the signal of the carrier only when there is no answer or signal to send in the application envisaged.
• the antennas 7, 8 comprise in the example of the turns arranged flat on the same substrate (or two separate substrates) as illustrated in FIGS. 3 and 13. Any known means of producing an antenna by the man of the art can be used as engraving, ultrasonic wire inlay, etc.
• the output antenna When the system is powered by a low voltage (3.3V), the output antenna is designed to perform a series resonance. When the system is powered by a strong current, the voltage between the total LC circuit will be relatively low, when a high voltage is present on each component L and C.
• the curve illustrated in FIG. 11 represents values obtained of reactance XL as a function of the inductance and thus of the reactance values XC as a function of a capacitor according to the frequency in application of the formulas below.
• the reactances XL and XC are equal.
• F is the series resonance frequency of the circuit.
• the voltage across the LC circuit (Fig. 10) is minimal when the current is at maximum. Since the magnetic flux is directly dependent on the intensity of the current, this series resonance is a means of creating a high magnetic field on the transmitting antenna 8 although it is powered by a low voltage.
• the circuit comprises separate receiving and transmitting antennas;
• the antennas are arranged between them so that their mutual inductance is minimal or at least partially cancels out.
• the arrangement is chosen so as to have a current induction in the reception antenna mimine especially less than the gain threshold of the reception stage 16. For example, with a gain of 3, provision is made for arrange the antennas together so that they have a voltage of less than 300 mV).
• the antenna arrangement can be made to have a current induction in the lower receive antenna in the ratio of 1/100 to the induction of current that would be generated by a reader emitting a level of field of 1.5A / m.
• the antennas are protected from each other by being separated from one another and / or by shielding.
• the antennas overlap and electronic protection means such as filters configured to avoid mutual disturbances are provided.
• the size of the transmitting antenna 8 is larger than the receiving antenna.
• the antennas are arranged in such a way that the mutual inductance between the two antennas is reduced to a minimum.
• Different solutions are possible including isolate one antenna with respect to the other, disable one antenna while the other is active and vice versa.
• this characteristic of minimized mutual induction is obtained by an overlap or superposition of the two antennas.
• the receiving antenna 7 larger in the example is arranged to have substantially a portion disposed outside the outer periphery of the transmitting antenna; Preferably, the receiving antenna 7 is substantially half astride on one side and within the periphery of the transmitting antenna 8 and half outside the periphery of the transmitting antenna.
• a portion of the flux F crosses, in a direction X, a portion A of the antenna 7 situated facing the inside of the transmitting antenna 8 generating an induced current ( i) in the antenna 7;
• another part of the flux F passes through a part B of the antenna 7 situated outside the surface of the transmitting antenna 8 in a direction Y opposite to X, generating an induced current (j) contrary to i).
• the disturbance induced in the receiving antenna by the transmitting antenna cancels itself at least in large part.
• the resultant may be substantially zero overall depending on the proper positioning of the antennas and their characteristics.
• the effectiveness of a self-cancellation may depend on the immediate environment outside the antenna such as, for example, the metallic environment of a telephone or host device of the object 1.
• the antennas may be on the same face of a substrate being isolated from each other or on opposite faces.
• Antennas can also be arranged on separate supports parallel to each other.
• a level matching circuit 16 connected to the combi chip 5 allowing the use of existing chips, including dual interface chips (combi banking) which are already certified and without any modification for simplification and industrial convenience;
• existing chips including dual interface chips (combi banking) which are already certified and without any modification for simplification and industrial convenience;
• it is expected the use of the La / Lb antenna interface of the existing combi chip (including the company Infineon SLE 66CLX800PE) to modulate / demodulate;
• the invention eliminates the use of a chip or NFC type component including an integrated oscillator.
• a contactless chip meeting the standard to ISO / IEC 14443 and / or ISO / IEC 15693 can be used.
• the circuit may include a detector configured to provide a signal representative of the presence an external magnetic field and trigger an operating mode among at least one contact mode and contactless mode.
• one and / or the other of the antennas of the circuit may already be integrated into a host device, the circuit of the invention without the antennas simply being connected to one of the antennas via a connector (not shown) for more adaptability of the circuit to host devices.
• the invention provides any device or communication device comprising the previously described circuit that is in removable form or not.
• the invention may also relate to any device comprising a transmitting and receiving antenna separate from each other.
• a transmitting and receiving antenna separate from each other.
• a small footprint such as an electronic door lock with radiofrequency triggering.
• a passive operating mode of the lock it is expected that the latter receives a radio frequency signal transmitted by a reader such as a mobile phone or a portable key transmitter.
• the lock comprises a transmitting antenna arranged according to the invention which is able to read a passive transponder such as a contactless smart card, electronic tag RFID or other.
• the antenna arrangement of the invention makes it possible to cancel a harmful effect of induction between the antennas without the addition of electronics or means deactivating or filtering the signals perceived by the receiving antenna.
• the antennas may also be arranged in non-parallel planes, for example perpendicular.
• the receiving antenna 7 can in particular be located in a plane close to an external or internal turn of the transmitting antenna, the plane of the antenna 8 substantially crossing a mediator of the coupling surface of the receiving antenna for attenuation. of the disturbance by the transmitting antenna.

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• 2011
  • 2011-04-15 EP EP11305454A patent/EP2511977A1/de not_active Withdrawn
• 2012
  • 2012-04-13 WO PCT/EP2012/056847 patent/WO2012140240A1/fr active Application Filing
  • 2012-04-13 US US14/111,927 patent/US20140045442A1/en not_active Abandoned
  • 2012-04-13 KR KR1020137029986A patent/KR20130141695A/ko active Application Filing
  • 2012-04-13 CN CN201280018511.5A patent/CN103597660A/zh active Pending
  • 2012-04-13 EP EP12715093.6A patent/EP2697862A1/de not_active Withdrawn
  • 2012-04-13 KR KR1020157036459A patent/KR20160003897A/ko not_active Application Discontinuation

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