RADIO FREQUENCY IDENTIFICATION SYSTEM PROVIDED FOR ACCESS CONTROL
First Claim
1. Radio frequency identification system provided for access control and comprisingan interrogator (Interrog),in which a data interface (DatInterf) exchanges data with an interrogator logic circuit (PassCommProtImplLCI) for implementing the passive communication protocol,which logic circuit transmits a signal to an interrogator amplitude modulator (AMI),to whose second input an output signal of a high-frequency signal generator (HFGen) is conducted andwhose output signal as a signal to be transmitted is conducted through an antenna matching transformer (AMatchTransf) to a transmitting and receiving first interrogator antenna (AI1),from which a received signal is conducted through the antenna matching transformer (AMatchTransf) and an interrogator amplitude demodulator (ADemI) to the interrogator logic circuit (PassCommProtImplLCI) for implementing the passive communication protocol,andat least one transponder (Transp),in which a transmitting and receiving first transponder antenna (AT1) is connected through a transponder amplitude demodulator (ADemT) to a transponder logic circuit (PassCommProtImplLCT) for implementing the passive communication protocol,which logic circuit exchanges data with a memory device (Mem) and whose output signal as a signal to be transmitted is conducted through a transponder amplitude modulator (AMT) to the transmitting and receiving first transponder antenna (AT1),which is connected to a rectifier (Rect) provided to supply energy to transponder elements andis connected to a clock extractor (ClExtr) provided to extract a clock signal for the transponder elements out of a magnetic field (BItransm) transmitted by the interrogator,andthe protocol for passive communication between the interrogator (Interrog) and the transponders (Transp),according to which protocol, inter alia,the interrogator (Interrog) turns on its high-frequency signal generator (HFGen) so that the transmitting and receiving first interrogator antenna (AI1) starts generating the magnetic field (BItransm) having a constant frequency,a time interval (Δ
- t) thereafter, the interrogator (Interrog) transmits an inventory request (InvReq) that the transponders (Transpin) located within an interrogator passive working distance shall present themselves,within a specified timeslot thereafter, each transponder (Transpin) located within the interrogator passive working distance transmits its own unique identification code,characterized inthat the interrogator (Interrog) is provided with an interrogator logic circuit (ActCommProtImplLCI) for implementing the active communication protocol,which logic circuit exchanges data with the data interface (DatInterf) andtransmits a signal to the interrogator amplitude modulator (AMI),whose output signal as a signal to be transmitted is conducted through the antenna matching transformer (AMatchTransf) to the transmitting and receiving first interrogator antenna (AI1),that the interrogator (Interrog) is provided with a receiving second interrogator antenna (AI2) provided for active communication,which antenna is connected through an interrogator active receiver (AMActRecI) for receiving amplitude-modulated signals to the interrogator logic circuit (ActCommProtImplLCI) for implementing the active communication protocol,that the transmitting and receiving first antenna (AT1) in each transponder (Transp) of the system is connected trough a transponder active receiver (AMActRecT) for receiving amplitude-modulated signals to a transponder logic circuit (ActComm-ProtImplLCT) for implementing the active communication protocol,which logic circuit exchanges data with a memory device (Mem) and whose output signal as a signal to be transmitted by the transmitter is conducted through a transponder active transmitter (AMActTransmT) for transmitting amplitude-modulated signals to a transmitting second transponder antenna (AT2) for the active communication,that each transponder (Transp) is provided with a high-frequency signal generator,that each transponder (Transp) is provided with a power supply circuit (SupplC),and that the active communication protocol determines thatthe interrogator (Interrog) turns on its active receiver (AMActRecI) for receiving amplitude-modulated signals after the transponders (Transpin) located inside the interrogator passive working distance have transmitted their own unique identification code within a specified timeslot andthereafter, each transponder (Transpout) located outside the interrogator passive working distance transmits its own unique identification code within a specified timeslot.
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Accused Products
Abstract
An interrogator (Interrog) is additionally provided with a logic circuit (ActCommProt-ImplLCI) for implementing an active communication protocol and with a receiving second antenna (AI2) provided for an active communication. Said antenna is connected through an active receiver (AMActRecI) for receiving amplitude-modulated signals to said logic circuit (ActComm-ProtlmplECI). A transmitting and receiving first antenna (AT1) in each transponder (Transp) is connected through an active receiver (AM-ActRecT) for receiving amplitude-modulated signals to a logic circuit (ActCommProt-ImplLCT) for implementing the active communication protocol, an output signal of which logic circuit is conducted through an active transmitter (AMActTransmT) for transmitting amplitude-modulated signals to a transmitting second antenna (AT2) for active communication. The transponder (Transp) is provided with a power supply circuit (SupplC). The passive communication protocol is a protocol according to standard ISO 15693 and the active communication protocol is similar thereto. Checking by means of the radio frequency identification system of the invention for access control can be carried out in a way comfortable for the user also at a distance from the interrogator somewhat exceeding one meter, whereas the transponder with a battery run-down has to be brought closer to the interrogator to a short distance usual till now.
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Citations
27 Claims
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1. Radio frequency identification system provided for access control and comprising
an interrogator (Interrog), in which a data interface (DatInterf) exchanges data with an interrogator logic circuit (PassCommProtImplLCI) for implementing the passive communication protocol, which logic circuit transmits a signal to an interrogator amplitude modulator (AMI), to whose second input an output signal of a high-frequency signal generator (HFGen) is conducted and whose output signal as a signal to be transmitted is conducted through an antenna matching transformer (AMatchTransf) to a transmitting and receiving first interrogator antenna (AI1), from which a received signal is conducted through the antenna matching transformer (AMatchTransf) and an interrogator amplitude demodulator (ADemI) to the interrogator logic circuit (PassCommProtImplLCI) for implementing the passive communication protocol, and at least one transponder (Transp), in which a transmitting and receiving first transponder antenna (AT1) is connected through a transponder amplitude demodulator (ADemT) to a transponder logic circuit (PassCommProtImplLCT) for implementing the passive communication protocol, which logic circuit exchanges data with a memory device (Mem) and whose output signal as a signal to be transmitted is conducted through a transponder amplitude modulator (AMT) to the transmitting and receiving first transponder antenna (AT1), which is connected to a rectifier (Rect) provided to supply energy to transponder elements and is connected to a clock extractor (ClExtr) provided to extract a clock signal for the transponder elements out of a magnetic field (BItransm) transmitted by the interrogator, and the protocol for passive communication between the interrogator (Interrog) and the transponders (Transp), according to which protocol, inter alia, the interrogator (Interrog) turns on its high-frequency signal generator (HFGen) so that the transmitting and receiving first interrogator antenna (AI1) starts generating the magnetic field (BItransm) having a constant frequency, a time interval (Δ - t) thereafter, the interrogator (Interrog) transmits an inventory request (InvReq) that the transponders (Transpin) located within an interrogator passive working distance shall present themselves,
within a specified timeslot thereafter, each transponder (Transpin) located within the interrogator passive working distance transmits its own unique identification code, characterized in that the interrogator (Interrog) is provided with an interrogator logic circuit (ActCommProtImplLCI) for implementing the active communication protocol, which logic circuit exchanges data with the data interface (DatInterf) and transmits a signal to the interrogator amplitude modulator (AMI), whose output signal as a signal to be transmitted is conducted through the antenna matching transformer (AMatchTransf) to the transmitting and receiving first interrogator antenna (AI1), that the interrogator (Interrog) is provided with a receiving second interrogator antenna (AI2) provided for active communication, which antenna is connected through an interrogator active receiver (AMActRecI) for receiving amplitude-modulated signals to the interrogator logic circuit (ActCommProtImplLCI) for implementing the active communication protocol, that the transmitting and receiving first antenna (AT1) in each transponder (Transp) of the system is connected trough a transponder active receiver (AMActRecT) for receiving amplitude-modulated signals to a transponder logic circuit (ActComm-ProtImplLCT) for implementing the active communication protocol, which logic circuit exchanges data with a memory device (Mem) and whose output signal as a signal to be transmitted by the transmitter is conducted through a transponder active transmitter (AMActTransmT) for transmitting amplitude-modulated signals to a transmitting second transponder antenna (AT2) for the active communication, that each transponder (Transp) is provided with a high-frequency signal generator, that each transponder (Transp) is provided with a power supply circuit (SupplC), and that the active communication protocol determines that the interrogator (Interrog) turns on its active receiver (AMActRecI) for receiving amplitude-modulated signals after the transponders (Transpin) located inside the interrogator passive working distance have transmitted their own unique identification code within a specified timeslot and thereafter, each transponder (Transpout) located outside the interrogator passive working distance transmits its own unique identification code within a specified timeslot. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- t) thereafter, the interrogator (Interrog) transmits an inventory request (InvReq) that the transponders (Transpin) located within an interrogator passive working distance shall present themselves,
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13. Radio frequency identification system provided for access control and comprising an interrogator (Interrog),
in which a data interface (DatInterf) exchanges data with an interrogator logic circuit (PassCommProtImplLCI) for implementing the passive communication protocol which logic circuit transmits a signal to an interrogator amplitude modulator (AMI), to whose second input an output signal of a high-frequency signal generator (HFGen) is conducted and whose output signal as a signal to be transmitted is conducted through an antenna matching transformer (AMatchTransf) to a transmitting and receiving first interrogator antenna (AI1), from which a received signal is conducted through the antenna matching transformer (AMatchTransf) and an interrogator amplitude demodulator (ADemI) to the interrogator logic circuit (PassCommProtImplLCI) for implementing the passive communication protocol, and at least one transponder (Transp), in which a transmitting and receiving first transponder antenna (AT1) is connected through a transponder amplitude demodulator (ADemT) to a transponder logic circuit (PassCommProtImplLCT) for implementing the passive communication protocol, which logic circuit exchanges data with a memory device (Mem) and whose output signal as a signal to be transmitted is conducted through a transponder amplitude modulator (AMT) to the transmitting and receiving first transponder antenna (AT1), which is connected to a rectifier (Rect) foreseen to supply energy to transponder elements and is connected to a clock extractor (ClExtr) foreseen to extract a clock signal for the transponder elements out of a magnetic field (BItransm) transmitted by the interrogator, and the protocol for the passive communication between the interrogator (Interrog) and the transponders (Transp), according to which protocol, inter alia, the interrogator (Interrog) turns on its high-frequency signal generator (HFGen) so that the transmitting and receiving first interrogator antenna (AI1) starts generating the magnetic field (BItransm) having a constant frequency, a time interval (Δ - t) thereafter, the interrogator (Interrog) transmits an inventory request (InvReq)
that transponders (Transpin) located within an interrogator passive working distance shall present themselves, within a specified timeslot thereafter, each transponder (Transpin) located within the interrogator passive working distance transmits its own unique identification code, characterized in that the interrogator (Interrog) is provided with an interrogator logic circuit (ActCommProtImplLCI) for implementing the active communication protocol, which logic circuit exchanges data with the data interface (DatInterf) and transmits a signal to an interrogator frequency modulator (FMI), whose output signal as a signal to be transmitted is conducted through the antenna matching transformer (AMatchTransf) to the transmitting and receiving first interrogator antenna (AI1), that the interrogator (Interrog) is provided with a receiving second interrogator antenna (AI2) provided for the active communication, which antenna is connected through an interrogator active receiver (FMActRecI) for receiving frequency-modulated signals to the interrogator logic circuit (ActCommProtImplLCI) for implementing the active communication protocol, that the transmitting and receiving first antenna (AT1) in each transponder (Transp) of the system is connected through a transponder active receiver (FMActRecT) for receiving frequency-modulated signals to a transponder logic circuit (ActCommProt-ImplLCT) for implementing the active communication protocol, which logic circuit exchanges data with the memory device (Mem) and whose output signal as a signal to be transmitted by the transmitter is conducted through a transponder active transmitter (FMActTransmT) for transmitting frequency-modulated signals to a transmitting second transponder antenna (AT2) for active communication, that each transponder (Transp) is provided with a high-frequency signal generator, that each transponder (Transp) is provided with a power supply circuit (SupplC), and that the active communication protocol determines that the interrogator (Interrog) turns on its active receiver (FMActRecI) for receiving frequency-modulated signals after the transponders (Transpin) located inside the interrogator passive working distance have transmitted their own unique identification code within the specified timeslot and thereafter, each transponder (Transpout) located outside the interrogator passive working distance transmits its own unique identification code within the specified timeslot. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
- t) thereafter, the interrogator (Interrog) transmits an inventory request (InvReq)
Specification