Contactless data transmission

Abstract

Contactless setup, comprehensive: an energy antenna (L energy ), which is designed to transmit and / or receive an energy signal, wherein the energy antenna (L energy ) a voltage compensation source (U comp_data ) includes, which is designed to compensate for a voltage induced in the energy antenna by the data signal; and a data antenna (L data ), which is designed to transmit a data signal, with the data antenna (L data ) a voltage compensation source (U comp_energy ) includes, which is designed to transmit a signal from the energy signal in the data antenna (L data ) to compensate for induced voltage.

Description

STATE OF THE ART

[0001] The present invention relates to a contactless communication system that features contactless data transfer at a high bit rate.

[0002] Fig. Figure 7 shows a well-known contactless communication system 700. The basic components of the contactless communication system 700 are the reader 710 and the contactless card 720.

[0003] The Leser 710 is also known as a Proximity Coupling Device (PCD). The Leser 710 comprises a generator voltage U0 and a transmission antenna L. PCD , a resonant capacitor C res and a resistor R Q The transmission antenna L PCD and the resonant capacitor C res are designed to be in resonance, so that at a predetermined frequency, from the perspective of the generator voltage U0, only the resistance R matters Q is seen.

[0004] The 720 contactless card is also known as a Proximity Integrated Circuit Chip (PICC), chip card, tag, transponder, or RFID (Radio Frequency Identification) tag. The 720 contactless card includes an inductive antenna L PICC , a resonant capacitor C PICC and an energy consumption resistance R PICC The L antenna PICC and the resonant capacitor C PICC They form a resonant circuit and are designed to equip the contactless 720 card with a specific resonant frequency.

[0005] During operation, the transmission antenna L transmits PCDA carrier signal, typically with a frequency of 13.56 MHz, generates a transmission field to supply the contactless card 720 with both power and data. Data can be transmitted to the contactless card 720 by modulating the carrier signal. When the contactless card 720 enters the transmission field of the reader 710, the transmission field induces a current in the card antenna L. PICC , and it is said that the transmission antenna L PCD and the card antenna L PICC are coupled. A voltage corresponding to the induced current is then multiplied by the resonant circuit. In certain implementations, the 720 contactless card is designed to transmit a response signal, which is intended as the carrier signal with data modulated onto an auxiliary carrier frequency, typically at a frequency of 848 kHz. The response signal generates a response field that is picked up by the transmission antenna L.PCD Reader 710 is detected.

[0006] In well-known systems, such as the contactless System 700, the communication protocol between the reader and the contactless card can be defined by any number of ISO (International Organization for Standardization) standards, such as 14443 Type A / B, 18092, 15693, 18000, etc.

[0007] The data communication and power supplied from the reader 710 to the contactless card 720 during the downward communication path are transmitted via a single transmission antenna L. PCD achieved. To optimize energy transfer and operating distance, the reader's resonant circuit, which incorporates a resonant capacitor C, focuses res and the transmission antenna L PCDThe resonant circuit is based on the carrier frequency and is often designed to have a high quality factor (Q). The bandwidth is inversely proportional to the Q factor, and thus the resulting bandwidth is small. Furthermore, a resonant circuit with a high Q factor attenuates the data-modulated carrier signal and affects the signal's settling time. For standardized data rates (such as up to 848 kbit / s), the downstream bandwidth of the Reader 710 is sufficient to meet transmission requirements. Higher data rates (such as above 848 kbit / s) require a larger bandwidth, but without reducing the quality factor (Q).

[0008] US Patent 6,427,065 B1 describes a power transfer system, an integrated circuit (IC) card, and an information communication system using an IC card. In the power transfer system, power is transmitted wirelessly from the power transfer device to the IC card. JP H09-321,652 A discloses a radio communication device comprising a power transfer antenna and a data receiving antenna. The device provides an extended communication range with low power consumption, miniaturization, and low weight. A contactless information recording medium is described in JP H09-73524 A. The arrangement features loop-like antenna structures, which at least partially suppress interference between a power carrier and a data carrier.EP 0 466 949 A1 discloses a device for the contactless transmission of data and energy, wherein separate antennas are provided for energy transfer and data transfer. US 2008 / 0 278 287 A1 discloses an RFID transceiver unit for detecting a signal from an RFID transponder. The transceiver unit comprises a transmitter including a loop-shaped transmitting antenna for transmitting an electromagnetic excitation field. Additionally, a receiver is provided, which also includes a loop-shaped antenna. The transceiver unit includes means for geometrically attenuating an interfering signal in the received signal. Finally, DE 37 82 203 T2 describes an antenna array with transmitting and receiving antenna coil devices and means for canceling the effect of an interfering signal.This allows the effect of the interfering signal to be eliminated while sufficient interaction with a remote transmit / receive system still exists.

[0009] In light of the above, a contactless device according to claims 1 and 16 is provided. Furthermore, a contactless communication system according to claim 13 is provided. In addition, a method for transmitting a contactless signal according to claim 17 is provided. Further features, improvements, and variants will become apparent from the following description and the claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1A shows a contactless communication system according to one embodiment. Fig. Figure 1B shows a contactless communication system according to another embodiment. Fig. 2A, Fig. 2B, and Fig. Figure 2C shows signal diagrams of a superposition of the energy signal and the data signal, which results in the overall transmission signal of the reader according to the respective embodiments. Fig. 3A and Fig. Figure 3B shows a contactless communication system according to another embodiment. Fig. Figure 4 shows a contactless communication method according to one embodiment. Fig. Figure 5 shows a contactless communication system according to another embodiment. Fig. Figure 6 shows a contactless communication system according to another embodiment. Fig. Figure 7 shows a well-known contactless communication system. DETAILED DESCRIPTION

[0010] The present application relates to a contactless communication system and a method for transmitting data between contactless devices (e.g. a reader or a contactless card) at high baud rates without compromising communication quality.

[0011] The contactless device includes an additional transmission antenna. The existing transmission antenna only transmits / receives an energy signal. This existing antenna, referred to here as the energy antenna, has a resonant circuit with a high quality factor (Q) and effectively a narrow bandwidth. Data transmission, on the other hand, is achieved using the additional antenna, referred to here as the data antenna, to transmit a data signal. Unlike the energy antenna, the data antenna is a broadband antenna and is not tuned to resonance or with a low quality factor (Q). Signal suppression is used to eliminate any influence of the signal from either antenna on the other. This signal suppression can be achieved geometrically or by using a voltage compensation source.

[0012] It is noted that certain components of the embodiments shown in the figures described below are also found in the known contactless communication system 700 by Fig. 7. Accordingly, these components are represented using the same or similar reference symbols. For brevity, their descriptions are not repeated for each embodiment.

[0013] Fig. Figure 1A shows a contactless communication system 100A according to one embodiment.

[0014] As shown, the contactless communication system 100A comprises a reader 110A and a contactless card 120. The contactless card 120 is identical to the one above with regard to Fig. The contactless card 720 described above is already available, and therefore its description does not need to be repeated here.

[0015] The reader 110A includes an energy antenna L energy and a data antenna L data. When the contactless card 120 is in the transmission field of the reader 110A, the energy antenna L can energy with a coupling coefficient K energy-PICC with the card antenna L PICC and the data antenna L data with a coupling coefficient k data-PICC couple.

[0016] With the energy antenna L energy is an energy generator voltage U energy , a resonant capacitor C res and a resistor R Q1 coupled. The energy antenna L energy and the resonant capacitor C res are designed to form a resonant circuit, so that at a predetermined frequency, from the perspective of the energy generator voltage U energy only the resistance R Q1 is seen. For effective energy transfer, the energy antenna L has energy a high quality factor and therefore a narrow bandwidth.

[0017] With the data antenna L datais a data generator voltage U data and a resistor R Q2 coupled. In contrast to the energy antenna L energy is the data antenna L data not coupled to a resonant capacitor. The data antenna L data is typically located in the same plane as the energy antenna L energy , although it is clear that this is not strictly necessary.

[0018] To understand interactions between the energy antenna L energy and the data antenna L data to delete, that is, to eliminate a signal generated by an energy antenna signal in the data antenna L data to prevent induced voltage and to avoid interference from a data antenna signal in the energy antenna L energy To prevent induced voltage, signal suppression is used. In the case of Fig. 1A this suppression is achieved geometrically, that is, the energy antenna L energy and the data antenna L dataThe antennas are shaped, sized, and positioned relative to each other such that a signal transmitted by one antenna is suppressed before it induces a voltage in the other antenna. Signal suppression occurs when the power and data signals have the same amplitude but are out of phase (i.e., a 180° phase shift). When the contactless card 120 is not near the reader 110A, there is essentially complete signal suppression between the power antenna L and the data antenna L. energy and the data antenna L data If, on the other hand, the contactless card 120 is located in the transmission field of the reader 110A, the only signal, which is a voltage in the L data -Antenna induces the signal from the contactless card 120.

[0019] During operation, the energy voltage generator U generates energy a voltage that powers the energy antenna L energycontrols the transmission of an energy signal to the contactless card 120. For optimal energy transfer, this energy signal is a narrowband signal, has a high quality factor (Q), and is concentrated on a carrier frequency. In contrast to the transmission antenna L PCD the above with reference to Fig. The conventional system 700 described in section 7 transmits the energy antenna L. energy It only uses energy and is not modulated with data.

[0020] Simultaneously, the data voltage generator generates U data a voltage that powers the data antenna L dataThe system controls the transmission of a data signal to the contactless card 120, as will be described in more detail later. This data signal is not affected by a resonant circuit, and therefore the data signal can be broadband with little or no baud rate limitation. The energy signal and the data signal are superimposed in the air between the reader 110A and the contactless card 120; that is, geometrically added to generate the reader's overall transmission signal, as will also be described in more detail later. This superposition concept is described here as the addition of the energy signal and the data signal. However, it is understood that these signals represent magnetic fields generated by currents in the respective antennas.

[0021] The energy antenna L energy As discussed above, it has a resonant circuit and therefore the energy voltage source U energy and the energy antenna L energyin phase. In contrast, the data antenna L has data no resonant circuit, and therefore there is a phase shift of 90° between the data voltage source U data and the data antenna L data The result is that the power signal is in phase and the data signal has a phase shift of 90°. This phase shift between the power and data signals can be digitally compensated in any known way.

[0022] When the contactless card 120 is moved within range of the reader's total transmission signal, a current is generated in the card antenna L. PICC induced. A voltage corresponding to the induced current is then generated by the series resonant circuit, i.e., the card antenna L. PICC and the resonant capacitor C PICCmultiplied. The contactless card 120 then transmits a response signal, which is a carrier of the reader's overall transmission signal with data actively modulated onto it. The data antenna L data The reader detects this through the antenna L PICC Response signal generated by the contactless card.

[0023] Fig. Figure 1B shows a contactless communication system 100B according to another embodiment in which the transmission antenna has a resonant circuit.

[0024] The 100B contactless communication system is the successor to the 100A contactless communication system. Fig. 1A is similar, except that it also includes a resonant capacitor C. res2 with the data antenna L data is coupled. The data antenna L data and the resonant capacitor C res2 They form a resonant circuit with a low quality factor. Since the data antenna L data from Fig. 1B has a resonant circuit, the data voltage source U data and the data antenna L data There is no phase shift relative to each other. The signals on the energy antenna L energy and the data antenna L data are in phase, and as a result, no phase shift is required between the signals of the two antennas.

[0025] The other components of Fig. 1B refers to the above with reference to Fig. 1A described similarly, and for the sake of brevity their descriptions are not repeated here.

[0026] Fig. 2A, Fig. 2B and Fig. Figures 2C each show signal diagrams of a superposition of the energy signal and data signal, which results in the total transmission signal of the reader according to the respective embodiments.

[0027] Fig. Figure 2A is a signal diagram of the superposition of the power signal and the data signal, resulting in the reader's overall transmission signal when the data signal is generated using phase-shift keying (PSK) modulation performed by a modulator (not shown). PSK modulation itself is known, and its details are therefore omitted here for brevity.

[0028] The data antenna L data is designed to transmit a data signal, and the energy antenna L energy is designed to transmit an energy signal. A superposition (i.e., a geometric addition) of the data signal H data and the energy signal H energy occurs "in the air", which affects the overall transmission signal H total the reader's. Mathematically expressed, H total = H energy + H data .

[0029] The energy signal H energyIt has a 0° angle and a predetermined amplitude. Fig. 2A is the energy signal H energy In the vector diagram, it is represented by the horizontal non-bold vector and in the signal diagram by the dashed wave.

[0030] The data signal H data is a signal with a 90° phase shift and is modulated -90° to represent a logic 0, or +90° to represent a logic 1. In the vector diagram, the logic 1 (i.e., +90°) for this signal is represented by the upward-pointing vertical non-bold solid vector, and the logic 0 (i.e., -90°) is represented by the downward-pointing vertical non-bold dashed vector. In the signal diagram, the data signal H data This is represented by the dotted wave. It is noted that if no data is modulated onto the data signal, there is no data signal, i.e., an amplitude of 0.

[0031] The superposition of the energy signal H energy and the data signal H data In the air, the total transmission signal H total of the reader. This total transmission signal H total It has an angle of ± Phi and a resulting amplitude. In the vector diagram, the logical 1 (i.e., +90°) for this signal is represented by the upward-angled bold solid vector, and the logical 0 (i.e., -90°) is represented by the downward-angled bold dashed vector. In the signal diagram, the total transmission signal H total represented by the solid wave.

[0032] During transmission, if no modulation is present, the resulting vector is that of the energy signal H. energy , because the vector of the data signal H data at amplitude 0. After PSK modulation on the data signal H data begins, the energy signal H remains energysame. To convert the data signal H data By modulating with a logical 1, the data signal becomes, in comparison with the energy signal H energy Shifted by +90°. The solid vector of the data signal H data points to logic 1, and the sum of the energy signal vector H energy and the vector of the data signal H data yields the vector of the total transmission signal H total of the reader, who is again the solid bold vector.

[0033] If, as an alternative, the data signal H data When modulated with a logical 0, the data signal H data so changed that, in comparison with the energy signal H energy A phase shift of -90° is present. The vector of the data signal H data then points to the logical 0, and the vector of the energy signal H energy plus the logical 0 vector of the data signal H data yields the vector of the data-modulated transmission signal H totalof the reader, which points to the logical 0.

[0034] During a transition from logic 1 to logic 0 and from logic 0 to logic 1, there is a phase shift of 180°. This is shown in the right half of Fig. 2A shows the step of the signal pulse diagram.

[0035] Fig. Figure 2B is a signal diagram of a superposition of the power signal and data signal, which yields the reader's overall transmission signal when the data signal is generated using amplitude-shift keying (ASK). ASK modulation itself is well-known, and its details are omitted here for brevity.

[0036] The energy signal H energy It has a 0° angle and a predetermined amplitude. Fig. 2B is the energy signal H energyIn the vector diagram, it is represented by the horizontal non-bold vector, and in the signal diagram, it is represented by the dashed line.

[0037] The data signal H data is a signal phase-shifted by 0° and is modulated with a specific amplitude and at 0° to represent a logic 1, or with a specific amplitude and at -180° to represent a logic 0. In the vector diagram, the logic 0 (i.e., -180°) for this signal is represented by the left-pointing horizontal non-bold solid vector, and the logic 1 (i.e., 0°) is represented by the right-pointing horizontal non-bold dashed vector. In the signal diagram, the data signal H data represented by the dotted wave.

[0038] Again, the superposition of the energy signal H results energy and the data signal H data in the air. Total transmission signal H totalof the reader. In the vector diagram, logic 0 (i.e., -180°) for this signal is represented by the bold solid vector, and logic 1 (i.e., 0°) is represented by the bold dashed vector. In the signal diagram, the total transmitted signal H total represented by the solid wave.

[0039] During transmission, if no modulation is present, the resulting vector is that of the energy signal H. energy , because the vector of the data signal H data lies at 0 amplitude. After ASK modulation on the data signal H data begins, the energy signal H remains energy even.

[0040] To the data signal H data When modulated with a logical 0, the data signal has a phase shift of -180° compared to the energy signal H. energy The solid vector of the data signal H data points to logic 0, and the sum of the energy signal vector H energyand the vector of the data signal H data yields the vector of the total transmission signal H total of the reader, which is the solid bold vector.

[0041] Alternatively, if the data signal H data modulated with a logical 1, the data signal H data modified so that there is a phase shift of 0° compared to the energy signal H energy consists of the vector of the data signal H. data then points to the logical 1, and the vector of the energy signal H energy plus the logical 1-vector of the data signal H data yields the vector of the total transmission signal H total of the reader, which points to the logical 1.

[0042] During a transition from logic 1 to logic 0 and from logic 0 to logic 1, there is a phase shift of 180°. This is shown in the step on the right side of the signal pulse diagram. Fig. 2B can be seen.

[0043] Fig. Figure 2C is a signal diagram of the superposition of the power signal and the data signal, which yields the reader's overall transmission signal when the data signal is generated using quadrature amplitude modulation (QAM). QAM modulation itself is well-known, and therefore its details are not given here for the sake of brevity.

[0044] As with the above with reference to Fig. The embodiments described in 2A and 2B with PSK and ASK modulation result in the superposition of the energy signal H. energy and the data signal H data in the air the total transmission signal H total the reader.

[0045] The energy signal H energy It has a 0° angle and a predetermined amplitude. Fig. 2C is the energy signal H energy In the vector diagram, it is represented by the horizontal non-bold vector, and in the signal diagram, it is represented by the dashed wave.

[0046] The data signal H data The data signal vector H is phase-shifted by 135° to represent a logical 00, by 45° to represent a logical 01, by -45° to represent a logical 10, and by -135° to 225° (-135° or 225°) to represent a logical 11. data is a pure QAM vector. The superposition of H data -vector and of H energy -vectors yields the specific constellation diagram shown in the vector diagram, where the total transmission signal H total The reader's input is represented by the solid and dashed bold vectors. The signal diagram on the right is similar to the signal diagrams of... Fig. 2A and Fig. 2B the data signal H data through the dotted line, the energy signal H energy through the dashed line and the total transmission signal H total represented by the solid line.

[0047] The invention is not limited to PSK, ASK, or QAM modulation. Other types of modulation are possible, such as frequency-shift keying (FSK) and discrete multi-tone (DMT). Furthermore, PSK and ASK modulation are not limited to binary modulation, and QAM modulation is not limited to 4-QAM modulation.

[0048] In one embodiment, to obtain the data signal H data to detect the energy signal H energy The signal is measured and stored in the contactless card 120. After modulation begins, the total transmission signal H can be measured. total the reader's energy can be measured, and then the stored energy signal H can be determined. energy subtracted from this, resulting in the data signal H dataThis results in, for example, if the energy signal is subtracted from the total transmission signal for QAM modulation, the result can be represented as the well-known QAM modulation constellation diagram, which has the first, second, third, and fourth quadrants of a circle.

[0049] Fig. 3A and Fig. Figure 3B shows a contactless communication system according to another embodiment, which includes voltage compensation sources. The contactless communication system 300 is the one described above with reference to Fig. 1A and Fig. The contactless communication systems 100A and 100B described in 1B are similar, except that the signal suppression used to eliminate the influence of the energy signal on the data antenna and the influence of the data signal on the energy antenna is not geometric but electrical.

[0050] The coupling between the L data- antenna and the L energy-Antenna is in Fig. 3A through the coupling coefficient k data-energy shown, and this coupling induces respective voltages U 1-energy and U 1-data in the two antennas. Unlike those in Fig. 1A and Fig. In the embodiments shown in 1B, the antennas of this embodiment are not shaped, dimensioned and positioned in any particular geometric way.

[0051] To suppress the influence of the power signal on the data antenna and vice versa, two voltage compensation sources are added. One compensation source is U comp-data compensates for the effect caused by the data signal H data in the energy antenna L energy caused induced voltage U 1-data The other compensation source U comp-energy compensates for the effect of the energy signal H energy in the data antenna L data caused induced voltage U 1-energy .

[0052] Fig. Figure 3B shows bar charts illustrating this voltage compensation. The bar chart on the left represents the energy antenna circuit. The compensation source U comp-data compensates for the effect caused by the data signal H data caused induced voltage U 1-data , and the result is the energy generator voltage U energy The other bar chart on the right represents the data antenna circuit. The compensation source U comp-energy compensates for the effect of the energy signal H energy caused induced voltage U 1-energy , which changes the data generator voltage U data results.

[0053] The electrical extinguishing system does not have a specific positioning requirement for the energy antenna L. energy and the data antenna L data It is preferable not to couple these two antennas closely to avoid induced voltages (i.e., U). 1-data and U1-energy ), which are high. These antennas should be positioned so that they each harmonize well with antenna L. PICC to couple to the contactless card, and in such a way that the induced voltages are at a level that can be electrically compensated.

[0054] The other components of Fig. 3A are similar to those described above with reference to other embodiments, and for the sake of brevity their descriptions are not repeated here.

[0055] Fig. Figure 4 shows a contactless communication method 400 according to one embodiment.

[0056] During the contactless communication procedure 400, an energy signal is generated and a data signal is generated using a modulation scheme, such as PSK, ASK, or QAM modulation (step 410). If necessary, a phase shift is applied between the energy signal H and the data signal. energy and the data signal H datacompensated (step 420). The energy signal H energy is from / to an energy antenna L energy Transmit / receive (step 430). The data signal H data is from the data antenna L data transmitted (step 440). One via the energy signal H energy in the data antenna L data The induced voltage is compensated in step 450, and a voltage generated by the data signal in the energy antenna L is applied. energy The induced voltage is compensated in step 460. As discussed above, a superposition occurs in the air between the energy signal H energy and the data signal H data .

[0057] It goes without saying that this procedure does not apply to the in Fig. The specific sequence of steps shown in Figure 4 is limited. Certain steps may occur in a different order or may occur simultaneously.

[0058] Fig. Figure 5 shows a contactless communication system 500 according to another embodiment. The contactless communication system 500 differs from the contactless communication systems of the embodiments described above in that the additional data antenna is located in the contactless card instead of in the reader.

[0059] The contactless reader 510 is the same as the one above with regard to Fig. The 7 described contactless readers 710 are configured, and their description does not need to be repeated here.

[0060] The contactless card 520 includes an energy antenna L PICC-energy and a data antenna L PICC-data The energy antenna L PICC-energy The contactless card 520 contains a narrowband antenna, as in the reader implementation, and is connected to the capacitor L. PICC- energy and the resistance R PICC1 connected in parallel. However, unlike the reader's implementation, the energy antenna L receives.PICC-energy It receives energy, but does not transmit it. This is due to the fact that the contactless card 520 does not have an active source, unlike the reader 510. Of course, registration should not be limited in this respect, as it is possible that the contactless card 520 includes an active source.

[0061] The data antenna L PICC-data is a broadband antenna for sending and / or transmitting data. With the data antenna L PICC-data is a capacitor C PICC-data and a resistor R PICC2 coupled. The data antenna L PICC-data and the capacitor C PICC-data are designed to form a resonant circuit with a low quality factor (Q). The modulated data can be actively generated by the 520 contactless card (e.g., using PSK, ASK, or QAM modulation) instead of using passive impedance modulation (i.e., backscatter or load modulation) as was previously the case. The data antenna LPICC-data is typically located in the same plane as the energy antenna L PICC-energy , although it is apparent that this is not strictly necessary. Furthermore, it is understood that the specific circuit of the data antenna L PICC-data This is merely an example, and an alternative circuit design can be used, such as one that does not contain a resonant circuit.

[0062] The functionality of the 500 contactless communication system is described above with reference to Fig. 1A and Fig. 1B is similar to the description above, and for the sake of brevity, its description is not included here.

[0063] The other components of Fig. 5 are the ones above with reference to Fig. 1A and Fig. 1B shows similar examples, and for the sake of brevity their descriptions are not repeated here.

[0064] Fig. Figure 6 shows a contactless communication system 600 according to another embodiment.

[0065] The contactless reader 610 is the same as the one above with regard to Fig. 1A and Fig. The contactless reader 110A, 110B described in section 1B is configured, and its description does not need to be repeated here.

[0066] The contactless card 620 includes a separate receiving antenna L pickup_PICC and a quenching circuit 630 for compensating the card's transmission signal, which is disrupted by a current in the card's transmission antenna L PICC is generated. During operation, the receiving antenna L detects pickup_PICC The card's transmission signal is transmitted together with the reader's total transmission signal. The erasure circuit 630 is designed to erase the card's transmission signal, while the reader's total transmission signal is erased due to the fact that the induced voltage of the reader's total transmission signal, which is received by the separate receiving antenna L pickup_PICCis detected by the card's resonant circuit, which is the card's transmission antenna L. PICC and the card capacitor C PICC encompasses, is not damped, and is kept almost undistorted.

[0067] The specific details of the deletion circuit 630 are beyond the scope of this application and are not given here for the sake of brevity.

[0068] The other components of Fig. 6 are similar to those described above with reference to other embodiments, and for the sake of brevity their descriptions are not repeated here.

[0069] In an alternative embodiment, any of the antennas L energy and L dataThe reader 610 is modified to include a deletion circuit similar to that of the contactless card 620. Again, the specific details of such a deletion circuit are beyond the scope of this application and are not given here for the sake of brevity.

Claims

[1] Contactless facility, comprehensive: an energy antenna (L energy ), which is designed to transmit and / or receive an energy signal, wherein the energy antenna (L energy ) a voltage compensation source (U comp_data ) includes, which is designed to compensate for a voltage induced in the energy antenna by the data signal; and a data antenna (L data ), which is designed to transmit a data signal, with the data antenna (L data ) a voltage compensation source (U comp_energy ) includes, which is designed to transmit a signal from the energy signal in the data antenna (L data ) to compensate for induced voltage. [2] Contactless device according to claim 1, wherein the energy antenna (L energy ) is a narrowband antenna. [3] Contactless device according to claim 1 or 2, wherein the data antenna (L data ) is a broadband antenna. [4] Contactless device according to one of claims 1 to 3, wherein the energy antenna (L energy ) includes a resonant circuit with a high quality factor, and the data antenna (L data ) includes a resonant circuit that has a low quality factor. [5] Contactless device according to one of claims 1 to 3, wherein only the energy antenna (L energy ) comprises a resonant circuit and the resonant circuit has a high quality factor and is tuned to resonance. [6] Contactless device according to any one of claims 1 to 5, further comprising a modulator designed to generate the data signal using one of the following: ASK modulation, PSK modulation, FSK modulation, QAM modulation and DMT modulation. [7] Contactless device according to any one of claims 1 to 6, wherein the data antenna (L data ) is also designed to receive a load-modulated signal. [8] Contactless device according to any one of claims 1 to 7, wherein the energy antenna (L energy ) and the data antenna (L data ) are positioned with respect to each other in such a way that a voltage induced by the energy signal in the data antenna is geometrically canceled. [9] Contactless device according to any one of claims 1 to 8, wherein the energy antenna (L energy ) and the data antenna (L data ) are on the same plane. [10] Contactless device according to any one of claims 1 to 9, wherein the contactless device is a contactless reader. [11] Contactless device according to any one of claims 1 to 10, wherein the contactless device is a contactless card. [12] Contactless device according to any one of claims 1 to 11, wherein the energy antenna (L energy ) is designed to receive only the energy signal. [13] Contactless communication system, including: a first contactless facility (110A, 110B, 310, 520, 610), encompassing: an energy antenna (L energy ), which is designed to transmit and / or receive an energy signal, wherein the energy antenna (L energy ) a voltage compensation source (U comp_data ) includes, which is designed to compensate for a voltage induced in the energy antenna by the data signal; and a data antenna (L data ), which is designed to transmit a data signal, with the data antenna (L data ) a voltage compensation source (U comp_energy ) includes, which is designed to transmit a signal from the energy signal in the data antenna (L data ) to compensate for induced stress; and a second contactless device (120, 320, 510, 620) designed to receive a superposition of the power signal and the data signal. [14] Contactless communication system according to claim 13, wherein the second contactless device (120, 320, 510, 620) comprises: a transmission antenna (L PICC ), which is designed to transmit a transmission signal, a recording antenna (L PICKUP_PICC ), which is designed to receive the superposition of the energy signal and data signal transmitted by the first contactless device (110A, 110B, 310, 520, 610) and the transmission signal; and a quenching circuit (630) designed to suppress a voltage of the transmission antenna (L PICC ) from a voltage of the receiving antenna (L PICKUP_PICC to subtract. [15] Contactless communication system according to claim 13 or 14, wherein the second contactless device (120, 320, 510, 620) comprises a single antenna designed to receive a superposition of the power signal and the data signal. [16] Contactless facility, comprehensive: an energy antenna device (L energy ) for transmitting and / or receiving an energy signal, wherein the energy antenna means (L energy ) a voltage compensation source (U comp_data ) includes, which is designed to compensate for a voltage induced in the energy antenna medium by the data signal; and a data antenna device (L data ) for transmitting a data signal, wherein the data antenna means (L data ) a voltage compensation source (U comp_energy ) includes, which is designed to transmit a signal from the energy signal into the data antenna medium (L data ) to compensate for induced voltage. [17] Method for transmitting a contactless signal, comprising: Transmitting and / or receiving an energy signal from an energy antenna (L energy ) a contactless device; transmission of a data signal from a data antenna (Ldata ) the contactless facility; Compensating for a voltage induced in the energy antenna by the data signal; and Compensating for a voltage induced in the data antenna by the energy signal. [18] Method according to claim 17, wherein the energy signal is a narrowband energy signal and the data signal is a broadband data signal. [19] Method according to claim 17 or 18, further comprising compensating for a phase shift between the energy signal and the data signal. [20] Method according to any one of claims 17 to 19, further comprising generating the data signal using one of the following alternatives: ASK modulation, PSK modulation, FSK modulation, QAM modulation and DMT modulation.

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